NTRS


Line plots across dimensions of each concept
Tables

Table of contents



us-gaap:CommonStockParOrStatedValuePerShare

us-gaap:CommonStockSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService
us-gaap:StatementBusinessSegments

us-gaap:Revenues

us-gaap:InterestExpense

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:NetIncomeLoss
us-gaap:StatementBusinessSegments
us-gaap:StatementEquityComponents

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:Assets

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents, ntrs:CumulativeEffectPeriodOfAdoption

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:Goodwill
us-gaap:StatementBusinessSegments

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents, ntrs:CumulativeEffectPeriodOfAdoption

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:TreasuryStockValue

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementBusinessSegments
us-gaap:StatementEquityComponents

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:EffectiveIncomeTaxRateContinuingOperations
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

ntrs:AllowanceForCreditLossRecovery

ntrs:AllowanceForCreditLossWriteoff

ntrs:AverageInterestBearingDepositsInFederalReserveBankForReserveRequirements

ntrs:ChangeInFederalFundsPurchased

ntrs:ChangeInPresentExpenseReversalAndWriteoffAfterRecovery
us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation
ntrs:ChangeinUnrealizedGainLossonAmountsRelatedtoSettlement

ntrs:CreditLossExpenseReversal
us-gaap:FinancialInstrument

ntrs:CreditLossExpenseReversalAndAvailableForSaleAllowanceForCreditLoss
us-gaap:StatementBusinessSegments

ntrs:EmployeeBenefits

ntrs:EquipmentAndSoftwareExpense

ntrs:FinancingReceivableTroubledDebtRestructuringPostmodificationUnpaidPrincipalBalance
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

ntrs:HeldToMaturitySecuritiesTransferredFromAvailableForSale

ntrs:IncomeLossBeforeIncomeTaxesIncludingFullyTaxableEquivalentAdjustment
us-gaap:StatementBusinessSegments

ntrs:IncomeTaxExpenseBenefitIncludingFullyTaxableEquivalentAdjustment
us-gaap:StatementBusinessSegments

ntrs:InterestExpenseSeniorNotes

ntrs:InterestIncomeFederalReserveDepositsAndOther

ntrs:InterestRevenueExpenseNetIncludingFullyTaxableEquivalentAdjustment
us-gaap:StatementBusinessSegments

ntrs:InvestmentSecurityGainsLossesNet

ntrs:NetChangeInClientSecuritySettlementReceivables

ntrs:NetIncomeLossAllocatedToCommonStockholdersBasic

ntrs:OtherFinancialAssetsCreditLossExpenseReversal

ntrs:OtherNoninterestIncome

ntrs:OtherThanTemporaryImpairmentLosses

ntrs:PaymentsForProceedsFromFederalReserveAndForeignCentralBankDeposits
us-gaap:StatementBusinessSegments
ntrs:PercentageOfConsolidatedNetIncome

ntrs:RevenueIncludingFullyTaxableEquivalentAdjustment
us-gaap:StatementBusinessSegments

ntrs:SalariesWagesAndIncentives

ntrs:SecurityCommissionsandTradingIncome

ntrs:SegmentReportingInformationConsolidatedAverageAssets
us-gaap:StatementBusinessSegments

ntrs:SegmentReportingInformationFullyTaxableEquivalentAdjustment

ntrs:TreasuryManagementFees

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments

us-gaap:AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount

us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:AwardType
us-gaap:TitleOfIndividual, us-gaap:AwardType

us-gaap:AmortizationOfESOPAward
us-gaap:StatementEquityComponents

us-gaap:AmortizationOfIntangibleAssets
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:CapitalizedComputerSoftwareAmortization1

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
us-gaap:InformationByCategoryOfDebtSecurity
us-gaap:CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation
us-gaap:ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1
us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation
us-gaap:ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1

us-gaap:CommonStockDividendsPerShareDeclared
us-gaap:StatementClassOfStock

us-gaap:DebtSecuritiesAvailableForSaleRealizedGain

us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss

us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss
us-gaap:FinancialInstrument
us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLossRecovery
us-gaap:FinancialInstrument
us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLossWriteoff
us-gaap:FinancialInstrument
us-gaap:DebtSecuritiesHeldToMaturityChangeInPresentValueExpenseReversal

us-gaap:DebtSecuritiesHeldToMaturityCreditLossExpenseReversal
us-gaap:FinancialInstrument
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanActuarialGainLoss
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanBenefitObligationIncreaseDecreaseForRemeasurementDueToSettlement
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanContributionsByEmployer
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanInterestCost
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanServiceCost
us-gaap:RetirementPlanType

us-gaap:DepreciationNonproduction
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:DerivativeGainLossOnDerivativeNet
us-gaap:HedgingDesignation

us-gaap:DividendsCommonStock
us-gaap:StatementEquityComponents

us-gaap:DividendsPreferredStock
us-gaap:StatementEquityComponents

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
us-gaap:FairValueByLiabilityClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
us-gaap:FairValueByLiabilityClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements

us-gaap:FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery
us-gaap:FinancingReceivablePortfolioSegment

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery
us-gaap:FinancingReceivablePortfolioSegment

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs
us-gaap:FinancingReceivablePortfolioSegment

us-gaap:FinancingReceivableModificationsNumberOfContracts2
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableModificationsPostModificationRecordedInvestment2
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax
us-gaap:StatementBusinessSegments
us-gaap:IncomeStatementLocation
us-gaap:GainLossOnFairValueHedgesRecognizedInEarnings

us-gaap:GoodwillForeignCurrencyTranslationGainLoss
us-gaap:StatementBusinessSegments

us-gaap:IncomeTaxesPaid

us-gaap:IncreaseDecreaseInDeposits

us-gaap:IncreaseDecreaseInDerivativeAssets

us-gaap:IncreaseDecreaseInInterestPayableNet

us-gaap:IncreaseDecreaseInReceivables

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:InterestAndDividendIncomeOperating

us-gaap:InterestAndFeeIncomeLoansAndLeases

us-gaap:InterestExpenseDeposits

us-gaap:InterestExpenseFederalFundsPurchased

us-gaap:InterestExpenseJuniorSubordinatedDebentures

us-gaap:InterestExpenseOtherLongTermDebt

us-gaap:InterestExpenseOtherShortTermBorrowings

us-gaap:InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase

us-gaap:InterestIncomeDepositsWithFinancialInstitutions

us-gaap:InterestIncomeExpenseAfterProvisionForLoanLoss

us-gaap:InterestIncomeExpenseNet

us-gaap:InterestIncomeSecuritiesTaxExempt

us-gaap:InterestIncomeSecuritiesTaxable

us-gaap:InterestPaidNet

us-gaap:MarketableSecuritiesGainLoss

us-gaap:NoninterestExpense
us-gaap:StatementBusinessSegments

us-gaap:NoninterestIncome
us-gaap:StatementBusinessSegments

us-gaap:NoninterestIncomeOther
us-gaap:StatementBusinessSegments

us-gaap:NoninterestIncomeOtherOperatingIncome

us-gaap:OccupancyNet
us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents
us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent
us-gaap:StatementEquityComponents
us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents
us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax
us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation
us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax
us-gaap:IncomeStatementLocation

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

us-gaap:OtherNoninterestExpense

us-gaap:OtherOperatingIncome

us-gaap:PaymentsForProceedsFromLoansAndLeases

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForRepurchaseOfPreferredStockAndPreferenceStock

us-gaap:PaymentsForSoftware

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsOfDividendsPreferredStockAndPreferenceStock

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt

us-gaap:PaymentsToAcquireHeldToMaturitySecurities

us-gaap:PensionContributions

us-gaap:PreferredStockDividendsIncomeStatementImpact
us-gaap:StatementClassOfStock
us-gaap:PreferredStockRedemptionPremium

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities

us-gaap:ProceedsFromPaymentsForFederalFundsSoldAndSecuritiesPurchasedUnderAgreementsToResellNet

us-gaap:ProceedsFromPaymentsForInInterestBearingDepositsInBanks

us-gaap:ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess

us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt

us-gaap:ProceedsFromStockOptionsExercised

us-gaap:ProfessionalFees

us-gaap:ProvisionForLoanLossesExpensed
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodTax

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation
us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueTreasuryStockReissued
us-gaap:StatementEquityComponents

us-gaap:StockRedeemedOrCalledDuringPeriodValue
us-gaap:StatementEquityComponents

us-gaap:TransferToOtherRealEstate

us-gaap:TreasuryStockValueAcquiredCostMethod
us-gaap:StatementEquityComponents

us-gaap:UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
ntrs:AffordableHousingInvestment
us-gaap:FairValueByMeasurementBasis

ntrs:AllowanceForCreditLoss

ntrs:AllowanceForCreditLossExcludingOffBalanceSheetCreditLossLiability

ntrs:ClientSecuritySettlementReceivables
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

ntrs:DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss

ntrs:DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss
ntrs:CreditRatingMoodysAndStandardPoors
ntrs:DebtSecuritiesHeldToMaturityPercentOfPortfolio
us-gaap:FinancialInstrument

ntrs:DerivativeAssetNotOffset

ntrs:DerivativeAssetNotSubjecttoMasterNettingArrangementNet

ntrs:DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellCollateral

ntrs:DerivativeLiabilityNotOffset

ntrs:DerivativeLiabilityNotSubjectToMasterNettingArrangementNet

ntrs:DerivativeLiabilitySecuritiesSoldUnderAgreementToRepurchaseCollateral

ntrs:FederalReserveAndForeignCentralBankDeposits
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

ntrs:FinancingReceivableAccrual
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

ntrs:FinancingReceivableAccruedInterestAfterAllowanceForCreditLoss

ntrs:FinancingReceivableAccruedInterestWriteoff
us-gaap:FinancingReceivablePortfolioSegment

ntrs:FinancingReceivableAllowanceForCreditLossesAndOffBalanceSheetCreditLossLiability
us-gaap:FinancingReceivablePortfolioSegment

ntrs:FinancingReceivableNonaccrualIncludingOtherRealEstateOwned

ntrs:FinancingReceivableNonaccrualTroubledDebtRestructuring

ntrs:FinancingReceivableRevolvingConvertedToTermLoan
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

ntrs:HedgedAssetLiabilityFairValueHedgeCumulativeIncreaseDecreaseNet
us-gaap:BalanceSheetLocation
ntrs:InvestmentsInCommunityDevelopmentProjectsCarryingAmountAssets
us-gaap:BalanceSheetLocation
ntrs:InvestmentsInCommunityDevelopmentProjectsCarryingAmountLiabilities
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:MeasurementInputType
ntrs:LoansMeasurementInput
us-gaap:Range, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:MeasurementInputType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
ntrs:LoansReceivableHeldToMaturity
us-gaap:FairValueByMeasurementBasis

ntrs:LoansReceivableOverdraftAdvances

ntrs:OffBalanceSheetCreditLossLiabilityCollectivelyEvaluatedForImpairment
us-gaap:FinancingReceivablePortfolioSegment

ntrs:OffBalanceSheetCreditLossLiabilityIndividuallyEvaluatedForImpairment
us-gaap:FinancingReceivablePortfolioSegment

ntrs:OtherAssetsExcludingDerivativesAndNonFinancialInstruments

ntrs:OtherFinancialAssetsAccruedInterestAfterAllowanceForCreditLoss

ntrs:OtherFinancialAssetsAllowanceForCreditLoss

ntrs:OtherLiabilitiesExcludingDerivativesAndNonFinancialInstruments

ntrs:OverdrawnDemandDepositAccounts
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
ntrs:PercentageofTotalEquityCreditLines

ntrs:SecuritiesContinuousUnrealizedLossPositionAggregateLosses
us-gaap:FinancialInstrument
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
ntrs:StandbyLettersOfCredit
us-gaap:FairValueByMeasurementBasis

ntrs:TrustPreferredSecurities
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:AdditionalPaidInCapital
us-gaap:BalanceSheetLocation
us-gaap:AlternativeInvestment
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:MeasurementInputType

us-gaap:AssetsNeededForImmediateSettlementAggregateFairValue

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtSecurities
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument

us-gaap:CashAndDueFromBanks
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:CollateralAlreadyPostedAggregateFairValue
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:CommitmentsFairValueDisclosure
us-gaap:FairValueByMeasurementBasis

us-gaap:ContractWithCustomerAssetNet
us-gaap:ProductOrService

us-gaap:CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLoss
us-gaap:FinancialInstrument
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:DebtSecuritiesTradingAndAvailableForSale
us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:DeferredCompensationPlanAssets
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:DemandDepositAccounts
us-gaap:FairValueByMeasurementBasis

us-gaap:Deposits

us-gaap:DepositsSavingsDeposits

us-gaap:DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

us-gaap:DerivativeAssetFairValueGrossLiability
us-gaap:CreditDerivativesByContractType, us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

us-gaap:DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection

us-gaap:DerivativeAssetNotSubjectToMasterNettingArrangement

us-gaap:DerivativeAssetNotSubjectToMasterNettingArrangementDeduction

us-gaap:DerivativeAssets
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

us-gaap:DerivativeCollateralObligationToReturnCash
us-gaap:CreditDerivativesByContractType, us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:DerivativeCollateralRightToReclaimCash
us-gaap:CreditDerivativesByContractType, us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:DerivativeFairValueOfDerivativeAsset

us-gaap:DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
us-gaap:CreditDerivativesByContractType, us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
us-gaap:CreditDerivativesByContractType, us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeFairValueOfDerivativeLiability

us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
us-gaap:CreditDerivativesByContractType, us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral
us-gaap:AssetsSoldUnderAgreementsToRepurchaseMaturityPeriods
us-gaap:CreditDerivativesByContractType, us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeLiabilities
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

us-gaap:DerivativeLiabilityFairValueGrossAsset
us-gaap:CreditDerivativesByContractType, us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

us-gaap:DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

us-gaap:DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:MeasurementInputType
us-gaap:DerivativeLiabilityMeasurementInput
us-gaap:Range, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:MeasurementInputType

us-gaap:DerivativeLiabilityNotSubjectToMasterNettingArrangement

us-gaap:DerivativeNetLiabilityPositionAggregateFairValue

us-gaap:DerivativeNotionalAmount
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:HedgingDesignation

us-gaap:FairValueDisclosureOffbalanceSheetRisksAmountLiability

us-gaap:FairValueHedgesAtFairValueNet

us-gaap:FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
us-gaap:FairValueByLiabilityClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue

us-gaap:FederalFundsPurchased
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:FederalFundsSold

us-gaap:FederalFundsSoldAndSecuritiesPurchasedUnderAgreementsToResell
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FederalHomeLoanBankStockAndFederalReserveBankStock
us-gaap:FairValueByMeasurementBasis

us-gaap:FinancialInstrumentsOwnedAndPledgedAsCollateralAmountEligibleToBeRepledgedByCounterparty

us-gaap:FinancingReceivableAllowanceForCreditLosses
ntrs:CumulativeEffectPeriodOfAdoption
us-gaap:FinancingReceivablePortfolioSegment

us-gaap:FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
us-gaap:FinancingReceivablePortfolioSegment

us-gaap:FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
us-gaap:FinancingReceivablePortfolioSegment

us-gaap:FinancingReceivableCollectivelyEvaluatedForImpairment
us-gaap:FinancingReceivablePortfolioSegment

us-gaap:FinancingReceivableDeferredIncome

us-gaap:FinancingReceivableIndividuallyEvaluatedForImpairment
us-gaap:FinancingReceivablePortfolioSegment

us-gaap:FinancingReceivableModificationsRecordedInvestment

us-gaap:FinancingReceivableNonaccrualNoAllowance
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableOriginatedInCurrentFiscalYear
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableRecordedInvestmentCurrent
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableRecordedInvestmentNonaccrualStatus
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:FinancingReceivablesPeriodPastDue
us-gaap:FinancingReceivableRecordedInvestmentPastDue
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivablesPeriodPastDue
us-gaap:FinancingReceivablesPeriodPastDue

us-gaap:FinancingReceivableRevolving
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

us-gaap:FiniteLivedIntangibleAssetsGross

us-gaap:HedgedAssetFairValueHedge

us-gaap:HedgedAssetFairValueHedgeCumulativeIncreaseDecrease

us-gaap:HedgedLiabilityFairValueHedge

us-gaap:HedgedLiabilityFairValueHedgeCumulativeIncreaseDecrease

us-gaap:HeldToMaturitySecurities
ntrs:CreditRatingMoodysAndStandardPoors
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, ntrs:CreditRatingMoodysAndStandardPoors

us-gaap:HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesFairValue
us-gaap:FinancialInstrument

us-gaap:InterestBearingDepositLiabilitiesForeign
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:InterestBearingDepositsInBanks
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:InvestmentOwnedBalanceContracts

us-gaap:LettersOfCreditOutstandingAmount

us-gaap:LoansAndLeasesReceivableImpairedCommitmentToLend
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:LoansReceivableHeldForSaleNetNotPartOfDisposalGroup
us-gaap:Range
us-gaap:LossContingencyEstimateOfPossibleLoss

us-gaap:MarketableSecurities

us-gaap:NoninterestBearingDepositLiabilitiesDomestic

us-gaap:NoninterestBearingDepositLiabilitiesForeign

us-gaap:NotesReceivableGross
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:OffBalanceSheetCreditLossLiability
us-gaap:FinancingReceivablePortfolioSegment

us-gaap:OtherAssets

us-gaap:OtherBorrowings
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:OtherLiabilities

us-gaap:OtherRealEstateAndForeclosedAssets
us-gaap:StatementClassOfStock
us-gaap:PreferredStockSharesIssued
us-gaap:StatementClassOfStock
us-gaap:PreferredStockSharesOutstanding
us-gaap:StatementClassOfStock
us-gaap:PreferredStockValue
us-gaap:AssetsSoldUnderAgreementsToRepurchase, us-gaap:AssetsSoldUnderAgreementsToRepurchaseMaturityPeriods
us-gaap:SecuredDebtRepurchaseAgreements
us-gaap:AssetsSoldUnderAgreementsToRepurchaseMaturityPeriods

us-gaap:SecuritiesHeldAsCollateralAtFairValue
ntrs:PledgedAndRestrictedAssets
us-gaap:LossContingenciesByNatureOfContingency
us-gaap:SecuritiesLoanedGross

us-gaap:SecuritiesPurchasedUnderAgreementsToResell

us-gaap:SecuritiesPurchasedUnderAgreementsToResellGross

us-gaap:SecuritiesSoldUnderAgreementsToRepurchase
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:SecuritiesSoldUnderAgreementsToRepurchaseGross

us-gaap:SecurityOwnedAndPledgedAsCollateralFairValue
ntrs:PledgedAndRestrictedAssets

us-gaap:SeniorNotes
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1
us-gaap:StatementEquityComponents

us-gaap:SubordinatedDebt
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:SubordinatedLongTermDebt
us-gaap:FairValueByMeasurementBasis

us-gaap:TimeDeposits
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:TradingSecurities
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:ValuationTechnique
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:TradingSecuritiesDebt
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementFrequency

us-gaap:TreasuryStockShares
ntrs:LeveragedLeases
us-gaap:VariableInterestEntityNonconsolidatedCarryingAmountAssets
us-gaap:BalanceSheetLocation, us-gaap:VariableInterestEntitiesByClassificationOfEntity
us-gaap:BalanceSheetLocation, us-gaap:VariableInterestEntitiesByClassificationOfEntity
us-gaap:VariableInterestEntityNonconsolidatedCarryingAmountLiabilities

Tables

  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302011-12-312011-09-302011-06-302010-12-312010-09-302010-06-30
us-gaap:CommonStockParOrStatedValuePerShare ▄▄▄▄▄▄▄▄▄▄▄▄1.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.6667NANA
us-gaap:CommonStockSharesOutstanding ▁▁▂▂▃▃▄▄████208209211214217219221223241240240242NANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding 209NA214217219NA223225NA241241NA242242
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic 208NA213216218NA222224NA240241NA242242
us-gaap:EarningsPerShareBasic ▇▇▇█▆█▇▇▁▂▁▂▂▃1.561.711.71.761.491.80999999999999961.591.690.53000000000000020.70.620.64000000000000010.640.82
us-gaap:EarningsPerShareDiluted ▇█▇█▆█▇▇▁▂▁▂▂▃1.551.711.691.751.481.79999999999999981.581.680.54000000000000030.70.620.64000000000000010.640.82
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302011-12-312011-09-302011-06-302010-12-312010-09-302010-06-30
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax █▇▇▆▄▄▅▅▄▇▆▁▃▆1003992975955928933939942924981955867899973
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService ntrs:CustodyandFundAdministration██▇▅▁▂▁▂417416414407397398396399NANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService ntrs:InvestmentManagementandAdvisory█▇▅▄▁▂▂▂510501491478459463468465NANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementBusinessSegments ntrs:CorporateAndInstitutionalService█▇▅▄▁▁▂▄574567559549535535541552NANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementBusinessSegments ntrs:WealthManagement█▇▅▄▂▂▂▁429425415406393398398390NANANANANANA
us-gaap:Revenues ▁█▁▁▁█▁▁▁▁▁▁▁▁100332139759559283140939942924981955867899973
us-gaap:InterestExpense ▃▄▆▇██▆▄▁▁▂▂▂▁12115520322224023119115483901131129685
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax █▅▅▆▆▅▅▆▁▄▄251191414111013-1312NANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▇▇██▇█▇█▁▃▂▂▂▄461476508506452485481507171252229214237299
us-gaap:IncomeTaxExpenseBenefit ▆▆█▇▆▄▆▇▁▄▄▂▄▆100105124117105761061164182775781100
us-gaap:ComprehensiveIncomeNetOfTax █▄▆█▆▇▅▅▁▃▃▂▃▃60026745357445548335538817181188117204216
us-gaap:NetIncomeLoss ▇▇▇▇▆█▇█▁▂▂▂▂▃360371384389347409374390130170152157155199
 us-gaap:NetIncomeLoss us-gaap:StatementBusinessSegments ntrs:CorporateAndInstitutionalService▆▅▆▆▅▇▇█▁▂▂▂▃▄1771641851911722052232395582738995138
 us-gaap:NetIncomeLoss us-gaap:StatementBusinessSegments ntrs:WealthManagement▃█▇▆▁▇▇▅189211205200178207204195NANANANANANA
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings360NA384389347409374390130170152157155199
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic ▆▇▇▇▆█▇▇▁▂▂▂▂▃330365367383329404357384130170152157155199
us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted ▆▇▇█▆█▇█▁▂▂▂▂▃326361362379325398353379128168150155154198
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302011-12-312011-09-302011-06-302010-12-312010-09-302010-06-30
us-gaap:Assets █▆▅▅▄▅▅▆▂▂▂▁161709136828124355126550121869132212132378135106100223960989739883843NANA
us-gaap:Liabilities █▆▄▅▄▅▅▆▃▂▂▁15082912573711354411574511125312170412201412474893106889459037277013NANA
us-gaap:LiabilitiesAndStockholdersEquity █▆▅▅▄▅▅▆▂▂▂▁161709136828124355126550121869132212132378135106100223960989739883843NANA
us-gaap:StockholdersEquity ████▇▇▇▇▂▂▂▁▁▁1087911091108111080510616105081036410357711771527025683067686619
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:RetainedEarnings███▇▇▇▆▆▂▂▁▁▁▁1182811656114411122510972107761049610262630262406138597258835796
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302011-12-312011-09-302011-06-302010-12-312010-09-302010-06-30
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302011-12-312011-09-302011-06-302010-12-312010-09-302010-06-30
us-gaap:PropertyPlantAndEquipmentNet ▇▇▁▁▂▃▂▃▇▇▇█490483400407411428417428494492495504NANA
us-gaap:Goodwill █████▇▇▇▄▄▂▁689696687682683669672673532534434400NANA
 us-gaap:Goodwill us-gaap:StatementBusinessSegments ntrs:CorporateAndInstitutionalService█████▇▇▇▄▄▂▁618625616610611598601602460462363329NANA
 us-gaap:Goodwill us-gaap:StatementBusinessSegments ntrs:WealthManagement▄▄▄▄▄▄▄▄▄717171717171717171NANANANANA
us-gaap:FiniteLivedIntangibleAssetsNet ▅▆▆▇▇▇██▆▇▄▁1141201211301321381441491231309353NANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302011-12-312011-09-302011-06-302010-12-312010-09-302010-06-30
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302011-12-312011-09-302011-06-302010-12-312010-09-302010-06-30
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302011-12-312011-09-302011-06-302010-12-312010-09-302010-06-30
us-gaap:StockholdersEquity ████▇▇▇▇▂▂▂▁▁▁1087911091108111080510616105081036410357711771527025683067686619
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:RetainedEarnings███▇▇▇▆▆▂▂▁▁▁▁1182811656114411122510972107761049610262630262406138597258835796
us-gaap:RetainedEarningsAccumulatedDeficit ███▇▇▇▆▆▁▁▁▁11828116561144111225109721077610496102626302624061385972NANA
us-gaap:TreasuryStockValue ██▇▆▆▆▅▅▁▁▁▁32253066283925642305217319501737225226227165NANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax █▅▆▅▃▂▁▁▃▅▄▄▄▄45-194-91-159-345-453-526-508-345-232-243-305-266-315
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302011-12-312011-09-302011-06-302010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInOperatingActivities ▁█▆▅▆▆█▆█▄▆▅▆▇-268516365778429345914533321391-700490-129152732
us-gaap:NetCashProvidedByUsedInInvestingActivities ▁▃▆▅█▅▆▄▄▆▅▅▅▅-21500-124031667-427611607-10211730-7538-64722215-3126-4072-477-2724
us-gaap:NetCashProvidedByUsedInFinancingActivities █▅▃▄▁▃▃▄▄▃▄▄▃▄2570810114-24834431-1144677-293962105155-2061402534611522896
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302011-12-312011-09-302011-06-302010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInOperatingActivities ▁█▆▅▆▆█▆█▄▆▅▆▇-268516365778429345914533321391-700490-129152732
us-gaap:NetIncomeLoss ▇▇▇▇▆█▇█▁▂▂▂▂▃360371384389347409374390130170152157155199
 us-gaap:NetIncomeLoss us-gaap:StatementBusinessSegments ntrs:CorporateAndInstitutionalService▆▅▆▆▅▇▇█▁▂▂▂▃▄1771641851911722052232395582738995138
 us-gaap:NetIncomeLoss us-gaap:StatementBusinessSegments ntrs:WealthManagement▃█▇▆▁▇▇▅189211205200178207204195NANANANANANA
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings360NA384389347409374390130170152157155199
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet ▁▇▃▆█▁▂▃▃▂▅▃▆▅-456203-249126368-435-294-242-220-31518-18417969
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302011-12-312011-09-302011-06-302010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInInvestingActivities ▁▃▆▅█▅▆▄▄▆▅▅▅▅-21500-124031667-427611607-10211730-7538-64722215-3126-4072-477-2724
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▃█▂▂▁▄▁▂▃▂▁▃▂▁3710822189581517413016312810
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302011-12-312011-09-302011-06-302010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInFinancingActivities █▅▃▄▁▃▃▄▄▃▄▄▃▄2570810114-24834431-1144677-293962105155-2061402534611522896
us-gaap:PaymentsForRepurchaseOfCommonStock █▇█▇▇▆▆▅▁▁▂▁▁▁2962643072712572342351901140020
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302011-12-312011-09-302011-06-302010-12-312010-09-302010-06-30

Common Stock Value

Common Stock Par Or Stated Value Per Share

us-gaap:CommonStockParOrStatedValuePerShare



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312009-05-01
Value1.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.671.66671.66671.6667
Percentage of CommonStockParOrStatedValuePerShare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Issued

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value208209211214217219221223224226227228229228226226228229231232233233235235236237238240239238239240241241240240241242241223220
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Authorized

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value209214217219223225227229230230228229229234235235237237239241241240240241241241241242242242242
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value208213216218222224225228229229226227228232233233235236237239239239240240241240241242242242241
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1.561.711.71.761.491.80999999999999961.591.691.591.521.211.121.11.11999999999999971.091.11.011.00000000000000040.971.110.950.980.850.760.750.69999999999999970.850.780.680.690.730.730.660.53000000000000020.70.620.620.64000000000000010.640.820.65
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1.551.711.691.751.481.79999999999999981.581.681.581.50999999999999981.21.121.091.11000000000000031.081.091.010.99000000000000020.961.10.940.980.840.750.750.70000000000000020.840.780.670.690.730.730.660.54000000000000030.70.620.610.64000000000000010.640.820.64
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302011-12-312011-09-302011-06-302010-12-312010-09-302010-06-30
Value1003992975955928933939942924981955867899973
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

ntrs:CustodyandFundAdministration



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value417416414407397398396399395
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax41.642.042.542.642.842.642.242.30.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax41.642.042.542.642.842.642.242.30.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ntrs:CustodyandFundAdministration100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:InvestmentManagementandAdvisory



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value510501491478459463468465465
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax50.950.650.450.049.449.649.949.30.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax50.950.650.450.049.449.649.949.30.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ntrs:InvestmentManagementandAdvisory100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:OtherTrustInvestmentAndOtherServicingFees



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value525049484950504850
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.25.15.05.05.35.45.45.10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.25.15.05.05.35.45.45.10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ntrs:OtherTrustInvestmentAndOtherServicingFees100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:ProductsandServicesOtherOperatingIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value10101010910101111
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.11.11.11.11.11.11.11.20.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.11.11.11.11.11.11.11.20.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ntrs:ProductsandServicesOtherOperatingIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:SecuritiesCommissionandTrading



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value292223192120192224
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.92.32.42.12.32.22.12.40.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.92.32.42.12.32.22.12.40.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ntrs:SecuritiesCommissionandTrading100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:SecuritiesLending



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value232220222221243026
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.32.32.12.32.52.32.63.20.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.32.32.12.32.52.32.63.20.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ntrs:SecuritiesLending100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalService



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value574567559549535535541552
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax57.257.157.457.557.657.457.658.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax57.257.157.457.557.657.457.658.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ntrs:CorporateAndInstitutionalService100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value429425415406393398398390
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax42.842.942.642.542.442.642.441.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax42.842.942.642.542.442.642.441.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ntrs:WealthManagement100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302011-12-312011-09-302011-06-302010-12-312010-09-302010-06-30
Value100332139759559283140939942924981955867899973
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0323.8100.0100.0100.0336.3100.0100.0100.0100.0100.0100.0100.0100.0

Operating Expenses

Interest Expense

us-gaap:InterestExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value12115520322224023119115412110899755646464544413637384044474952545560677767848390113112112968583
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.115.720.823.325.924.820.316.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.09.09.211.90.012.910.88.70.0

Interest Expense Long Term Debt

Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value251191414111013-136342-1-963-13-25-51-3-5-10-45-4-414-515-1312
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.61.11.01.51.61.21.11.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0-1.40.10.2

Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value461476508506452485481507483435416390390389373394359350353411350345304270269245301285242223266266236171252229230214237299
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax45.948.052.153.148.752.051.253.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.018.525.824.00.024.726.430.8

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1001051241171057610611610279118122114123116134117111118142119101998888769594785587867541827779578110081
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.010.612.712.311.38.111.312.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.04.58.48.10.06.69.110.30.0

Income Taxes Paid Net

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value60026745357445548335538831527730228129415623730533014023426128414219121218926321912416210023718123017181188176117204216186
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax59.827.046.560.249.051.737.941.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.01.818.519.70.013.622.822.30.0

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value360371384389347409374390381356298267276266257260241239234269230244204181181169206191164167178179161130170152151157155199157
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax35.937.439.440.837.443.939.941.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.014.117.415.90.018.117.320.50.0

us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalService



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1771641851911722052232392341581641471441441328613413312410412212092858571841007971688168558273828995138110
Percentage of NetIncomeLoss49.344.348.149.349.750.259.661.461.444.355.255.152.454.151.333.155.755.852.938.753.249.545.346.747.442.141.152.448.442.838.245.242.242.548.748.554.456.961.469.470.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.716.619.020.118.622.023.825.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.06.08.47.70.010.310.614.20.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ntrs:CorporateAndInstitutionalService30.929.033.034.932.238.441.243.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ntrs:TreasuryAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-6-4-6-2-4-3-53-45-4241-14-194-13-105503-44901011881310-5-14140720197511-38-2
Percentage of NetIncomeLoss-1.9-1.2-1.6-0.7-1.3-0.9-14.2-11.6-11.211.6-4.8-7.11.6-5.0-3.921.4-0.21.5-1.918.50.34.15.64.54.87.85.2-2.9-0.82.58.10.24.515.511.65.03.87.6-2.24.4-1.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.7-0.4-0.6-0.3-0.5-0.4-5.7-4.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.02.22.00.80.01.4-0.40.90.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ntrs:TreasuryAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ntrs:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value18921120520017820720419519015714813912613513511810710211511510711310088868511096869196
Percentage of NetIncomeLoss52.656.953.551.551.550.754.650.249.844.149.652.146.050.952.645.644.542.749.042.846.546.449.148.847.950.153.750.552.454.753.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.921.321.121.019.322.321.820.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ntrs:WealthManagement44.249.749.549.345.452.251.450.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value360384389347409374390381356298267276266263260241239234269230244204181181169206191164167178179161130170152151157155199157
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0102.3100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax35.939.440.837.443.939.941.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.014.117.415.90.018.117.320.50.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value330365367383329404357384364350281262255260251254235233228263224234204181181169206191164167178179161130170152151157155199157
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax32.936.837.640.135.543.338.040.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.014.117.415.90.018.117.320.50.0

Net Income Loss Available To Common Stockholders Diluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value326361362379325398353379359345276257250255247250231229225259221230201178178167203187161165176176160128168150149155154198155
Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax32.536.437.239.735.042.637.640.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.013.917.215.70.018.017.220.30.0

Assets

us-gaap:Assets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value16170913682812435512655012186913221213237813510612967213859013140012560512148812392612008512150911779811674911999511994210695210994611115310576110383210294795969972369315697463936329445591604100223960989739892679838438214182053
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1508291257371135441157451112531217041220141247481194461283741212351155371115111141561105051125581089661080431112101111939834410149710261197718958849503588152895118554489936861008706584381931068894590372857517701375829
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets93.391.991.391.591.392.192.292.392.192.692.392.091.892.192.092.692.592.592.792.792.092.392.392.492.392.391.992.191.892.392.092.292.192.992.692.892.591.992.3

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value161709136828124355126550121869132212132378135106129672138590131400125605121488123926120085121509117798116749119995119942106952109946111153105761103832102947959699723693156974639363294455916041002239609897398926798384382141
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value1087911091108111080510616105081036410357102261021610165100679977977095798951883287058784874986078448854280427948791278177724761275277532739072237117715270256928683067686619644763126389
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.78.18.78.58.77.97.87.77.97.47.78.08.27.98.07.47.57.57.37.38.07.77.77.67.77.78.17.98.27.78.07.87.97.17.47.27.58.10.00.00.07.77.8

us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value-415-422-389-394-398-410-378-385-392-342-314-318-323-325-309-313-317-321-322-328-340-260
Percentage of StockholdersEquity-3.8-3.8-3.6-3.6-3.8-3.9-3.6-3.7-3.8-3.3-3.1-3.2-3.2-3.3-3.2-3.5-3.6-3.7-3.7-3.8-4.0-3.3
Percentage of Assets-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.2-0.2-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value3-32404-6-1146-3
Percentage of StockholdersEquity0.0-0.00.00.0-0.00.0-0.1-0.00.00.00.1-0.0
Percentage of Assets0.0-0.00.00.0-0.00.0-0.0-0.00.00.00.0-0.0
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value313114190133-29-114-199-167-147-74-13-11-13-32637743-315259276
Percentage of StockholdersEquity2.91.01.81.2-0.3-1.1-1.9-1.6-1.4-0.7-0.1-0.1-0.1-0.30.70.90.5-0.40.60.70.30.1
Percentage of Assets0.20.10.20.1-0.0-0.1-0.2-0.1-0.1-0.1-0.0-0.0-0.0-0.00.10.10.0-0.00.00.00.00.0
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value45-194-91-159-345-453-526-508-505-414-335-338-352-370-259-239-283-372-273-273-266-319-218-205-236-244-337-350-284-283-215-274-276-345-232-243-279-305-266-315-332-361-494-90
Percentage of StockholdersEquity0.4-1.8-0.8-1.5-3.3-4.3-5.1-4.9-4.9-4.1-3.3-3.4-3.5-3.8-2.7-2.7-3.2-4.3-3.1-3.1-3.1-3.8-2.6-2.6-3.0-3.1-4.3-4.5-3.7-3.8-2.9-3.7-3.8-4.9-3.3-3.5-4.0-4.5-3.9-4.8-5.2-5.7-7.70.0
Percentage of Assets0.0-0.1-0.1-0.1-0.3-0.3-0.4-0.4-0.4-0.3-0.3-0.3-0.3-0.3-0.2-0.2-0.2-0.3-0.2-0.2-0.2-0.3-0.2-0.2-0.2-0.2-0.4-0.4-0.3-0.3-0.2-0.3-0.3-0.3-0.2-0.2-0.3-0.40.00.00.0-0.4-0.60.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value143117106968267564632-1-8-11-16-18-16-7-13-17-4-1-17
Percentage of StockholdersEquity1.31.11.00.90.80.60.50.40.3-0.0-0.1-0.1-0.2-0.2-0.2-0.1-0.2-0.2-0.0-0.0-0.00.1
Percentage of Assets0.10.10.10.10.10.10.00.00.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.0
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value9381013100910131003106810551050102010471037102710101035103810401022107210581044102410501055103910221035103110149951012100499598197796294893292091190589588817869
Percentage of StockholdersEquity8.69.19.39.49.510.210.210.110.010.310.210.210.110.610.811.611.612.312.111.911.912.412.412.912.913.113.213.113.113.513.313.513.613.713.513.513.513.513.513.713.914.12.80.0
Percentage of Assets0.60.70.80.80.80.80.80.80.80.80.80.80.80.80.90.90.90.90.90.91.01.00.91.01.01.01.11.01.11.01.11.11.11.01.01.01.01.10.00.00.01.10.20.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408379379
Percentage of StockholdersEquity3.83.73.83.83.83.93.93.94.04.04.04.14.14.24.34.64.64.74.74.74.74.84.85.15.15.25.25.35.45.45.45.55.75.75.75.85.96.06.06.26.36.55.90.0
Percentage of Assets0.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.50.00.00.00.50.50.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PreferredStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-312012-12-312008-12-31
Value8841273882882882882882882882882882882882882882388388388388388388001501
Percentage of StockholdersEquity8.111.58.28.28.38.48.58.58.68.68.78.88.89.09.24.34.44.54.44.44.60.00.023.5
Percentage of Assets0.50.90.70.70.70.70.70.70.70.60.70.70.70.70.70.30.30.30.30.30.40.00.01.8
Percentage of Assets us-gaap:PreferredStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value1182811656114411122510972107761049610262997396859431924790748908873685668394824280937949777176257469734472417134704069096793670266076502632363026240613860545972588357965665557650914556
Percentage of StockholdersEquity108.7105.1105.8103.9103.4102.6101.399.197.594.892.891.990.991.291.295.795.094.792.190.990.390.387.491.391.190.290.189.489.389.087.788.087.588.587.287.487.487.486.987.687.988.379.70.0
Percentage of Assets7.38.59.28.99.08.27.97.67.77.07.27.47.57.27.37.07.17.16.76.67.36.96.76.97.06.97.37.17.36.97.16.96.96.36.56.36.57.10.00.00.06.86.20.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value-3225-3066-2839-2564-2305-2173-1950-1737-1553-1392-1259-1158-1045-1094-1225-1212-1097-1033-891-768-719-704-561-544-488-422-325-256-301-314-273-241-214-225-226-227-188-165-169-175-189-199-266-405
Percentage of StockholdersEquity-29.6-27.6-26.3-23.7-21.7-20.7-18.8-16.8-15.2-13.6-12.4-11.5-10.5-11.2-12.8-13.5-12.4-11.9-10.1-8.8-8.4-8.3-6.6-6.8-6.1-5.3-4.2-3.3-4.0-4.2-3.6-3.3-3.0-3.2-3.2-3.2-2.7-2.4-2.5-2.7-2.9-3.2-4.20.0
Percentage of Assets-2.0-2.2-2.3-2.0-1.9-1.6-1.5-1.3-1.2-1.0-1.0-0.9-0.9-0.9-1.0-1.0-0.9-0.9-0.7-0.6-0.7-0.6-0.5-0.5-0.5-0.4-0.3-0.3-0.3-0.3-0.3-0.3-0.2-0.2-0.2-0.2-0.2-0.20.00.00.0-0.2-0.30.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents, ntrs:CumulativeEffectPeriodOfAdoption

us-gaap:RetainedEarnings, ntrs:CumulativeEffectPeriodOfAdoptionAdjustment



Period End2020-01-01
Value-10
Percentage of StockholdersEquity0.0
Percentage of Assets0.0
Percentage of Assets us-gaap:RetainedEarnings ntrs:CumulativeEffectPeriodOfAdoptionAdjustment0.0

Property Plant And Equipment Gross

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value490483400407411428417428442464462463459466438434437446427436442444436441449458444454457469453462481494492495494504543
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.40.30.30.30.30.30.30.30.30.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.50.50.50.50.50.50.50.50.50.50.50.60.7

Goodwill

us-gaap:Goodwill



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value689696687682683669672673611605526523519519524527523526529534527533538544541540537530529537538533536532534434405400401389
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.50.60.50.60.50.50.50.50.40.40.40.40.40.40.40.40.50.40.40.50.50.50.50.50.50.60.50.60.60.60.60.60.50.60.40.40.50.50.5

us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalService



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value618625616610611598601602540534455452448448453456452455458462456461466473470469466459458466466461465460462363334329334322
Percentage of Goodwill89.789.889.789.689.689.489.489.488.488.386.586.486.386.386.486.586.486.586.586.686.586.686.786.986.886.886.786.586.586.786.786.686.786.686.683.682.482.283.382.8
Percentage of Assets0.40.50.50.50.50.50.50.40.40.40.30.40.40.40.40.40.40.40.40.40.40.40.40.40.50.50.50.50.50.50.50.50.50.50.50.40.40.40.40.4
Percentage of Assets ntrs:CorporateAndInstitutionalService0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ntrs:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-312011-12-31
Value7171717171717171717171717171717171717171717171717171717171
Percentage of Goodwill10.310.210.310.410.410.610.610.611.611.713.513.613.713.713.613.513.613.513.513.413.513.413.313.113.213.213.313.313.4
Percentage of Assets0.00.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of Assets ntrs:WealthManagement0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Intangible Assets Net Excluding Goodwill

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value114120121130132138144149160161373941414547454649515260657378838792971041081121201231309353
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.00.00.00.00.00.00.00.00.00.00.00.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1

Deferred Tax Assets Liabilities Net

Long Term Debt

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value1087911091108111080510616105081036410357102261021610165100679977977095798951883287058784874986078448854280427948791278177724761275277532739072237117715270256928683067686619644763126389
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.78.18.78.58.77.97.87.77.97.47.78.08.27.98.07.47.57.57.37.38.07.77.77.67.77.78.17.98.27.78.07.87.97.17.47.27.58.10.00.00.07.77.8

us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value-415-422-389-394-398-410-378-385-392-342-314-318-323-325-309-313-317-321-322-328-340-260
Percentage of StockholdersEquity-3.8-3.8-3.6-3.6-3.8-3.9-3.6-3.7-3.8-3.3-3.1-3.2-3.2-3.3-3.2-3.5-3.6-3.7-3.7-3.8-4.0-3.3
Percentage of Assets-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.2-0.2-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value3-32404-6-1146-3
Percentage of StockholdersEquity0.0-0.00.00.0-0.00.0-0.1-0.00.00.00.1-0.0
Percentage of Assets0.0-0.00.00.0-0.00.0-0.0-0.00.00.00.0-0.0
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value313114190133-29-114-199-167-147-74-13-11-13-32637743-315259276
Percentage of StockholdersEquity2.91.01.81.2-0.3-1.1-1.9-1.6-1.4-0.7-0.1-0.1-0.1-0.30.70.90.5-0.40.60.70.30.1
Percentage of Assets0.20.10.20.1-0.0-0.1-0.2-0.1-0.1-0.1-0.0-0.0-0.0-0.00.10.10.0-0.00.00.00.00.0
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value45-194-91-159-345-453-526-508-505-414-335-338-352-370-259-239-283-372-273-273-266-319-218-205-236-244-337-350-284-283-215-274-276-345-232-243-279-305-266-315-332-361-494-90
Percentage of StockholdersEquity0.4-1.8-0.8-1.5-3.3-4.3-5.1-4.9-4.9-4.1-3.3-3.4-3.5-3.8-2.7-2.7-3.2-4.3-3.1-3.1-3.1-3.8-2.6-2.6-3.0-3.1-4.3-4.5-3.7-3.8-2.9-3.7-3.8-4.9-3.3-3.5-4.0-4.5-3.9-4.8-5.2-5.7-7.70.0
Percentage of Assets0.0-0.1-0.1-0.1-0.3-0.3-0.4-0.4-0.4-0.3-0.3-0.3-0.3-0.3-0.2-0.2-0.2-0.3-0.2-0.2-0.2-0.3-0.2-0.2-0.2-0.2-0.4-0.4-0.3-0.3-0.2-0.3-0.3-0.3-0.2-0.2-0.3-0.40.00.00.0-0.4-0.60.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value143117106968267564632-1-8-11-16-18-16-7-13-17-4-1-17
Percentage of StockholdersEquity1.31.11.00.90.80.60.50.40.3-0.0-0.1-0.1-0.2-0.2-0.2-0.1-0.2-0.2-0.0-0.0-0.00.1
Percentage of Assets0.10.10.10.10.10.10.00.00.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.0
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value9381013100910131003106810551050102010471037102710101035103810401022107210581044102410501055103910221035103110149951012100499598197796294893292091190589588817869
Percentage of StockholdersEquity8.69.19.39.49.510.210.210.110.010.310.210.210.110.610.811.611.612.312.111.911.912.412.412.912.913.113.213.113.113.513.313.513.613.713.513.513.513.513.513.713.914.12.80.0
Percentage of Assets0.60.70.80.80.80.80.80.80.80.80.80.80.80.80.90.90.90.90.90.91.01.00.91.01.01.01.11.01.11.01.11.11.11.01.01.01.01.10.00.00.01.10.20.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408379379
Percentage of StockholdersEquity3.83.73.83.83.83.93.93.94.04.04.04.14.14.24.34.64.64.74.74.74.74.84.85.15.15.25.25.35.45.45.45.55.75.75.75.85.96.06.06.26.36.55.90.0
Percentage of Assets0.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.50.00.00.00.50.50.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PreferredStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-312012-12-312008-12-31
Value8841273882882882882882882882882882882882882882388388388388388388001501
Percentage of StockholdersEquity8.111.58.28.28.38.48.58.58.68.68.78.88.89.09.24.34.44.54.44.44.60.00.023.5
Percentage of Assets0.50.90.70.70.70.70.70.70.70.60.70.70.70.70.70.30.30.30.30.30.40.00.01.8
Percentage of Assets us-gaap:PreferredStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value1182811656114411122510972107761049610262997396859431924790748908873685668394824280937949777176257469734472417134704069096793670266076502632363026240613860545972588357965665557650914556
Percentage of StockholdersEquity108.7105.1105.8103.9103.4102.6101.399.197.594.892.891.990.991.291.295.795.094.792.190.990.390.387.491.391.190.290.189.489.389.087.788.087.588.587.287.487.487.486.987.687.988.379.70.0
Percentage of Assets7.38.59.28.99.08.27.97.67.77.07.27.47.57.27.37.07.17.16.76.67.36.96.76.97.06.97.37.17.36.97.16.96.96.36.56.36.57.10.00.00.06.86.20.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value-3225-3066-2839-2564-2305-2173-1950-1737-1553-1392-1259-1158-1045-1094-1225-1212-1097-1033-891-768-719-704-561-544-488-422-325-256-301-314-273-241-214-225-226-227-188-165-169-175-189-199-266-405
Percentage of StockholdersEquity-29.6-27.6-26.3-23.7-21.7-20.7-18.8-16.8-15.2-13.6-12.4-11.5-10.5-11.2-12.8-13.5-12.4-11.9-10.1-8.8-8.4-8.3-6.6-6.8-6.1-5.3-4.2-3.3-4.0-4.2-3.6-3.3-3.0-3.2-3.2-3.2-2.7-2.4-2.5-2.7-2.9-3.2-4.20.0
Percentage of Assets-2.0-2.2-2.3-2.0-1.9-1.6-1.5-1.3-1.2-1.0-1.0-0.9-0.9-0.9-1.0-1.0-0.9-0.9-0.7-0.6-0.7-0.6-0.5-0.5-0.5-0.4-0.3-0.3-0.3-0.3-0.3-0.3-0.2-0.2-0.2-0.2-0.2-0.20.00.00.0-0.2-0.30.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents, ntrs:CumulativeEffectPeriodOfAdoption

us-gaap:RetainedEarnings, ntrs:CumulativeEffectPeriodOfAdoptionAdjustment



Period End2020-01-01
Value-10
Percentage of StockholdersEquity0.0
Percentage of Assets0.0
Percentage of Assets us-gaap:RetainedEarnings ntrs:CumulativeEffectPeriodOfAdoptionAdjustment0.0

Common Stock Value

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value11828116561144111225109721077610496102629973968594319247907489088736856683948242809379497771762574697344724171347040690967936702660765026323630262406138605459725576
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.38.59.28.99.08.27.97.67.77.07.27.47.57.27.37.07.17.16.76.67.36.96.76.97.06.97.37.17.36.97.16.96.96.36.56.36.57.16.8

Treasury Stock Value

us-gaap:TreasuryStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value322530662839256423052173195017371553139212591158104510941225121210971033891768719704561544488422325256301314273241214225226227188165199
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.02.22.32.01.91.61.51.31.21.01.00.90.90.91.01.00.90.90.70.60.70.60.50.50.50.40.30.30.30.30.30.30.20.20.20.20.20.20.2

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value45-194-91-159-345-453-526-508-505-414-335-338-352-370-259-239-283-372-273-273-266-319-218-205-236-244-337-350-284-283-215-274-276-345-232-243-279-305-266-315-332-361-494-90
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.0-0.1-0.1-0.1-0.3-0.3-0.4-0.4-0.4-0.3-0.3-0.3-0.3-0.3-0.2-0.2-0.2-0.3-0.2-0.2-0.2-0.3-0.2-0.2-0.2-0.2-0.4-0.4-0.3-0.3-0.2-0.3-0.3-0.3-0.2-0.2-0.3-0.40.00.00.0-0.4-0.60.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-26851636577842934591453332-477850557-4727848381184-214-2991350-10431036490-337-2661001538-1212242-159431223251-2187571391-70049072-12915273234
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-267.6164.959.28.931.649.2154.835.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0150.4-71.451.30.0-14.916.975.20.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-21500-124031667-427611607-10211730-753811156-8055-5667-13241026-4939-322-55836533609-2849-104662805853-5981-2262-822-6193-2201-17274438-3705724-32947903-64722215-3126-8005-4072-477-27245506
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2142.3-1250.1170.9-447.51249.6-109.3184.3-799.50.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0-699.8225.8-327.30.0-469.5-53.1-279.80.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2570810114-24834431-1144677-29396210-9167643646322891-27074715-130741253-3035133912421-2191-417527614267886814-1989-510446673978-11732909-87875155-20614025868434611522896-5365
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2561.61019.4-254.6463.7-1232.38.3-313.0658.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0557.5-210.1421.40.0399.117.0297.50.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-26851636577842934591453332-477850557-4727848381184-214-2991350-10431036490-337-2661001538-1212242-159431223251-2187571391-70049072-12915273234
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-267.6164.959.28.931.649.2154.835.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0150.4-71.451.30.0-14.916.975.20.0

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value360371384389347409374390381356298267276266257260241239234269230244204181181169206191164167178179161130170152151157155199157
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax35.937.439.440.837.443.939.941.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.014.117.415.90.018.117.320.50.0

us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalService



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1771641851911722052232392341581641471441441328613413312410412212092858571841007971688168558273828995138110
Percentage of NetIncomeLoss49.344.348.149.349.750.259.661.461.444.355.255.152.454.151.333.155.755.852.938.753.249.545.346.747.442.141.152.448.442.838.245.242.242.548.748.554.456.961.469.470.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.716.619.020.118.622.023.825.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.06.08.47.70.010.310.614.20.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ntrs:CorporateAndInstitutionalService30.929.033.034.932.238.441.243.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ntrs:TreasuryAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-6-4-6-2-4-3-53-45-4241-14-194-13-105503-44901011881310-5-14140720197511-38-2
Percentage of NetIncomeLoss-1.9-1.2-1.6-0.7-1.3-0.9-14.2-11.6-11.211.6-4.8-7.11.6-5.0-3.921.4-0.21.5-1.918.50.34.15.64.54.87.85.2-2.9-0.82.58.10.24.515.511.65.03.87.6-2.24.4-1.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.7-0.4-0.6-0.3-0.5-0.4-5.7-4.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.02.22.00.80.01.4-0.40.90.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ntrs:TreasuryAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ntrs:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value18921120520017820720419519015714813912613513511810710211511510711310088868511096869196
Percentage of NetIncomeLoss52.656.953.551.551.550.754.650.249.844.149.652.146.050.952.645.644.542.749.042.846.546.449.148.847.950.153.750.552.454.753.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.921.321.121.019.322.321.820.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ntrs:WealthManagement44.249.749.549.345.452.251.450.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value360384389347409374390381356298267276266263260241239234269230244204181181169206191164167178179161130170152151157155199157
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0102.3100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax35.939.440.837.443.939.941.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.014.117.415.90.018.117.320.50.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-456203-249126368-435-294-242242-461-122713172-669-104-222343-1264113151134108-302-26-109-85173-18820011686-407-220-3151832-18417969-206
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-21500-124031667-427611607-10211730-753811156-8055-5667-13241026-4939-322-55836533609-2849-104662805853-5981-2262-822-6193-2201-17274438-3705724-32947903-64722215-3126-8005-4072-477-27245506
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2142.3-1250.1170.9-447.51249.6-109.3184.3-799.50.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0-699.8225.8-327.30.0-469.5-53.1-279.80.0

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value371082218958151762723251453262012431217253018181348121911451179413016831281019
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2570810114-24834431-1144677-29396210-9167643646322891-27074715-130741253-3035133912421-2191-417527614267886814-1989-510446673978-11732909-87875155-20614025868434611522896-5365
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2561.61019.4-254.6463.7-1232.38.3-313.0658.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0557.5-210.1421.40.0399.117.0297.50.0

Proceeds From Issuance Of Long Term Debt

Repayments Of Long Term Debt

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value296264307271257234235190263170124157706565140140152140961071657774163122971574624935141140360203
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Repayments Of Long Term Debt

Debt Instrument Interest Rate Stated Percentage

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value0.218-0.0039999999999999760.2440.2320.232-0.0160000000000000140.2210.230.2110.2840.3140.2940.3110.3390.3270.3360.3460.3410.3280.3280.3270.3150.3310.3240.3280.3250.3190.3260.3380.3430.3450.3340.34
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period

us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

us-gaap:EmployeeStockOption



Period End2020-03-312019-03-31
Value763554.0798669.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod100.0100.0

us-gaap:PerformanceShares



Period End2020-03-312019-03-312018-03-312017-03-312016-03-31
Value205847.0211269.0242232.0206091.0354606.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod27.026.50.00.00.0

Deferred Tax Liabilities

Deferred Tax Assets Net

Unrecognized Tax Benefits

Deferred Tax Assets Valuation Allowance

Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions

Operating Lease Right Of Use Asset

Cash And Cash Equivalents Period Increase Decrease

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302017-12-312016-12-31
Value58334459503750744581507345185332
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0

Proceeds From Repayments Of Short Term Debt

ntrs:AllowanceForCreditLossRecovery



Period End2020-03-312019-03-31
Value12
Percentage of AllowanceForCreditLossRecovery100.0100.0

ntrs:AllowanceForCreditLossWriteoff



Period End2020-03-312019-03-31
Value11
Percentage of AllowanceForCreditLossWriteoff100.0100.0

ntrs:AverageInterestBearingDepositsInFederalReserveBankForReserveRequirements



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value1700016001500150001700170018004004000180020002200230018001800170017001500130013001200900900900110010001100467238331186268
Percentage of AverageInterestBearingDepositsInFederalReserveBankForReserveRequirements100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:ChangeInFederalFundsPurchased



Period End2020-03-312019-03-31
Value-38171942
Percentage of ChangeInFederalFundsPurchased100.0100.0

ntrs:ChangeInPresentExpenseReversalAndWriteoffAfterRecovery



Period End2020-03-312019-03-31
Value0-1
Percentage of ChangeInPresentExpenseReversalAndWriteoffAfterRecovery100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation

ntrs:ChangeinUnrealizedGainLossonAmountsRelatedtoSettlement

us-gaap:InterestRateContract, us-gaap:InterestExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-29-63-14-6819115
Percentage of ChangeinUnrealizedGainLossonAmountsRelatedtoSettlement100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestRateContract, us-gaap:InterestIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value072551136-31-61
Percentage of ChangeinUnrealizedGainLossonAmountsRelatedtoSettlement17.286.8-46.7135.1-343.8247.8-54.779.5-246.720.2-609.19.9

ntrs:CreditLossExpenseReversal



Period End2020-03-312019-03-31
Value600
Percentage of CreditLossExpenseReversal100.00.0

us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities



Period End2020-03-31
Value200000.0
Percentage of CreditLossExpenseReversal0.3

ntrs:CreditLossExpenseReversalAndAvailableForSaleAllowanceForCreditLoss



Period End2020-03-312019-03-31
Value610
Percentage of CreditLossExpenseReversalAndAvailableForSaleAllowanceForCreditLoss100.00.0

us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalService



Period End2020-03-312019-03-31
Value25-1
Percentage of CreditLossExpenseReversalAndAvailableForSaleAllowanceForCreditLoss42.10.0

ntrs:WealthManagement



Period End2020-03-312019-03-31
Value351
Percentage of CreditLossExpenseReversalAndAvailableForSaleAllowanceForCreditLoss57.90.0

ntrs:EmployeeBenefits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value9792878985908588919174757777737270696973726270686666636463636164686966675455605863
Percentage of EmployeeBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:EquipmentAndSoftwareExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value16216415114714815214514414013213013312712011411811411611311411010310011610198959291908699909576837378726966
Percentage of EquipmentAndSoftwareExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:FinancingReceivableTroubledDebtRestructuringPostmodificationUnpaidPrincipalBalance



Period End2020-03-31
Value25
Percentage of FinancingReceivableTroubledDebtRestructuringPostmodificationUnpaidPrincipalBalance100.0

us-gaap:FinancingReceivablePortfolioSegment

us-gaap:CommercialPortfolioSegment



Period End2020-03-312019-03-31
Value248
Percentage of FinancingReceivableTroubledDebtRestructuringPostmodificationUnpaidPrincipalBalance95.30.0

us-gaap:ConsumerPortfolioSegment



Period End2020-03-312019-03-31
Value19
Percentage of FinancingReceivableTroubledDebtRestructuringPostmodificationUnpaidPrincipalBalance4.70.0

us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:CommercialPortfolioSegment, ntrs:CommercialAndInstitutionalLoans



Period End2020-03-312019-03-31
Value248
Percentage of FinancingReceivableTroubledDebtRestructuringPostmodificationUnpaidPrincipalBalance95.30.0

us-gaap:ConsumerPortfolioSegment, us-gaap:ResidentialRealEstate



Period End2020-03-312019-03-31
Value19
Percentage of FinancingReceivableTroubledDebtRestructuringPostmodificationUnpaidPrincipalBalance4.70.0

ntrs:HeldToMaturitySecuritiesTransferredFromAvailableForSale



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302017-09-30
Value016016002872871000
Percentage of HeldToMaturitySecuritiesTransferredFromAvailableForSale0.0100.0100.00.0100.0100.0100.0

ntrs:IncomeLossBeforeIncomeTaxesIncludingFullyTaxableEquivalentAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value469486516514460498491516492451428399399394380401365357359417356352311277278254309293250232277276246180262240240224246309
Percentage of IncomeLossBeforeIncomeTaxesIncludingFullyTaxableEquivalentAdjustment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalService



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value227211244250226265289302301224243215211199193120197185182149180156135121120941231481158310111710176133121132124147213
Percentage of IncomeLossBeforeIncomeTaxesIncludingFullyTaxableEquivalentAdjustment48.543.647.448.649.253.258.958.661.149.756.753.852.950.450.929.953.952.050.835.850.544.543.443.643.436.940.050.546.136.136.442.341.242.150.750.454.955.259.769.0

ntrs:TreasuryAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value-9-5-7-3-5-42-69-46-61-26-52-39-15-22-3190-47-783414141418247-9-30221613171312-311
Percentage of IncomeLossBeforeIncomeTaxesIncludingFullyTaxableEquivalentAdjustment-1.9-1.2-1.5-0.8-1.3-8.6-14.2-9.0-12.4-5.8-12.3-9.8-3.9-5.6-8.122.6-1.12.2-2.020.01.24.24.85.06.59.62.5-3.1-1.60.38.00.62.87.76.50.81.55.6-1.23.8

ntrs:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value250280279268239276271260252253238223203217217190172163184184171181161142139136177154138148154
Percentage of IncomeLossBeforeIncomeTaxesIncludingFullyTaxableEquivalentAdjustment53.457.654.152.152.155.455.350.351.356.155.656.051.055.257.247.547.245.951.244.348.251.351.851.350.153.557.552.655.563.655.6

ntrs:IncomeTaxExpenseBenefitIncludingFullyTaxableEquivalentAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value10811513112511288116126110951301311231281231401231171241481251081069596851021028664989685509288896791109
Percentage of IncomeTaxExpenseBenefitIncludingFullyTaxableEquivalentAdjustment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalService



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value49475958535966636666786766546134625158455736423634223848351232353320504749345175
Percentage of IncomeTaxExpenseBenefitIncludingFullyTaxableEquivalentAdjustment45.941.445.546.647.566.856.650.060.370.060.251.454.142.950.224.150.344.146.830.545.733.239.837.836.026.537.747.141.718.833.237.039.341.354.653.855.651.356.868.3

ntrs:TreasuryAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value-2-1-1-1-1-38-16-1-18-67-38-20-20-8-2135-34-2333435911-3-3-2-3710-6-2-5-2003
Percentage of IncomeTaxExpenseBenefitIncludingFullyTaxableEquivalentAdjustment-2.0-1.2-1.4-0.8-1.3-43.8-14.1-0.8-16.6-70.8-29.6-15.3-16.2-7.0-17.124.8-2.83.7-2.122.72.94.43.36.29.713.1-2.9-3.6-3.0-5.47.91.2-0.5-12.5-2.8-6.6-2.20.90.42.7

ntrs:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value60687367606867646295908476828271646169696467605352516758525658
Percentage of IncomeTaxExpenseBenefitIncludingFullyTaxableEquivalentAdjustment56.159.855.954.253.976.957.550.856.3100.869.464.062.164.166.951.052.552.355.346.851.562.456.956.154.360.365.256.561.386.658.9

ntrs:InterestExpenseSeniorNotes



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value17181918151514111111111111111111111111111111111317171819191918161616161515141111
Percentage of InterestExpenseSeniorNotes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:InterestIncomeFederalReserveDepositsAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2436445068696057545252413626282316910101211989532242557964324
Percentage of InterestIncomeFederalReserveDepositsAndOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:InterestRevenueExpenseNetIncludingFullyTaxableEquivalentAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value416430425425429430418422392396366350362329310306314296275257266270256253254259244228233
Percentage of InterestRevenueExpenseNetIncludingFullyTaxableEquivalentAdjustment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalService



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value21122422922923426125324722919719417616614713814113811710892968178767375706664
Percentage of InterestRevenueExpenseNetIncludingFullyTaxableEquivalentAdjustment50.852.154.154.054.660.960.558.758.449.853.050.245.944.744.646.144.139.639.536.036.030.030.630.329.029.228.628.927.4

ntrs:TreasuryAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value00000-37-37-34-357-14-718137517322323325246444551382021
Percentage of InterestRevenueExpenseNetIncludingFullyTaxableEquivalentAdjustment0.00.00.00.00.0-8.6-8.9-8.3-9.02.0-3.9-2.15.24.12.51.75.411.08.79.312.219.318.217.418.019.715.79.19.3

ntrs:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value204206195195195205202209198190186181177168164160158146142141138137131132135132136141147
Percentage of InterestRevenueExpenseNetIncludingFullyTaxableEquivalentAdjustment49.247.945.946.045.447.748.549.650.648.251.051.948.851.252.952.350.549.451.854.751.850.751.252.353.151.155.761.963.2

ntrs:InvestmentSecurityGainsLossesNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0000000000000000000000000-200000000000000
Percentage of InvestmentSecurityGainsLossesNet0.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.00.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.0

ntrs:NetChangeInClientSecuritySettlementReceivables



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1241-1286796-750419106-4831484-1058372-442142519-931-229317-261240-108-18766042-52-251485-273144671-1232970353-260207-169-629273602-3-157-108175
Percentage of NetChangeInClientSecuritySettlementReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:NetIncomeLossAllocatedToCommonStockholdersBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value326361362379325398353379359345276257250255246250231229225259221230201178178166203187161165176176159128168150149155154198
Percentage of NetIncomeLossAllocatedToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:OtherFinancialAssetsCreditLossExpenseReversal



Period End2020-03-312019-03-31
Value700000.00.0
Percentage of OtherFinancialAssetsCreditLossExpenseReversal100.00.0

ntrs:OtherNoninterestIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value176134144133130152126149154
Percentage of OtherNoninterestIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:OtherThanTemporaryImpairmentLosses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value00000000000001020000090000300107-70
Percentage of OtherThanTemporaryImpairmentLosses0.00.0100.0100.00.0100.0100.00.0100.0100.00.00.0100.0100.00.0100.00.00.00.00.00.0100.00.00.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0

ntrs:PaymentsForProceedsFromFederalReserveAndForeignCentralBankDeposits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value1120410715-45394246-6738-2445-4394738-11533627646672572-7674913-6881885-1987-37985094
Percentage of PaymentsForProceedsFromFederalReserveAndForeignCentralBankDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

ntrs:PercentageOfConsolidatedNetIncome

ntrs:CorporateAndInstitutionalService



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.49-0.0100000000000000090.480.490.5-0.0300000000000000270.590.620.61-0.0300000000000000270.550.550.520.0199999999999999620.510.330.560.0200000000000000180.530.390.530.0099999999999999530.450.470.47-0.0099999999999999530.410.520.480.00.380.450.42-0.0100000000000000090.490.480.54-0.0200000000000000180.610.70.7
Percentage of PercentageOfConsolidatedNetIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:TreasuryAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-0.020.0-0.02-0.01-0.010.03-0.14-0.12-0.110.04-0.05-0.070.02-0.030000000000000006-0.040.210.0-0.009999999999999995-0.020.180.00.00.060.040.050.010.05-0.030.00.08-0.0300000000000000020.050.019999999999999990.110.050.040.01-0.020.04-0.01
Percentage of PercentageOfConsolidatedNetIncome-4.1-0.0-4.2-2.0-2.0-100.0-23.7-19.4-18.0-133.3-9.1-12.73.8-150.0-7.863.60.0-50.0-3.846.20.00.013.38.510.6-100.012.2-5.80.021.1-6.711.9-200.022.410.47.4-50.0-3.35.7-1.4

ntrs:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value0.530.0100000000000000090.540.520.510.00.550.50.5-0.0100000000000000090.50.520.460.0100000000000000090.530.460.44-0.0100000000000000090.490.430.47-0.0100000000000000090.490.490.480.00.540.510.520.00.54
Percentage of PercentageOfConsolidatedNetIncome108.2-100.0112.5106.1102.0-0.093.280.682.033.390.994.588.550.0103.9139.478.6-50.092.5110.388.7-100.0108.9104.3102.1-0.0131.798.1108.30.0142.1

ntrs:RevenueIncludingFullyTaxableEquivalentAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value1595155715451514148815161484151514841440135713301293124612201323119611631161126211401137108510881049105410551028984979983998975965981955908
Percentage of RevenueIncludingFullyTaxableEquivalentAdjustment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalService



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value912887898881873906887905882825786758722693685676669634644639612591565569545543536545511493493514500500507499457
Percentage of RevenueIncludingFullyTaxableEquivalentAdjustment57.257.058.258.258.659.859.859.759.557.357.957.055.955.656.251.155.954.655.550.753.752.052.152.452.051.550.853.152.050.450.251.551.351.951.752.350.3

ntrs:TreasuryAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value2-2-6-3-5-19-30-17-1720-81211961282232241273654474943533922242839312837422326
Percentage of RevenueIncludingFullyTaxableEquivalentAdjustment0.2-0.1-0.4-0.2-0.3-1.3-2.0-1.2-1.21.4-0.60.11.71.60.59.71.92.82.110.13.24.84.44.54.25.13.72.22.52.94.03.23.03.94.32.52.9

ntrs:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value680672653636620629627628619594579570548533528518504495493495491491472469460457479460448457450
Percentage of RevenueIncludingFullyTaxableEquivalentAdjustment42.643.242.342.041.741.542.341.441.741.342.742.942.442.843.339.242.242.642.539.343.143.243.543.143.843.445.544.745.646.745.8

ntrs:SalariesWagesAndIncentives



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value499463458455482444436454471457418432425390382389378365361361354355348372341334324326320316315313321341311320294281273278274
Percentage of SalariesWagesAndIncentives100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:SecurityCommissionsandTradingIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value4127292323232126272321242021202018182020192014171414161818201717181513151517141513
Percentage of SecurityCommissionsandTradingIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:SegmentReportingInformationConsolidatedAverageAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value124170186116352116358119416-55012215512386612449391112115911840011647666011638211491311341799610992411169110751311271052441033241002431634952129284991569-43892709924109512820239402992359832651382747067428574969
Percentage of SegmentReportingInformationConsolidatedAverageAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalService



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value92715-107859828669690351-53833608215383637-123822508058477803605756967569675372852413054329939762401599075999557252984536535197651316261506384861649662453497554770643710973387013727837358
Percentage of SegmentReportingInformationConsolidatedAverageAssets74.7-57.373.974.575.79.668.266.367.2-13.667.968.166.891.765.065.966.585.537.638.837.035.656.958.157.160.256.456.056.0-59.654.652.652.222.452.951.752.570.451.850.249.8

ntrs:TreasuryAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value00000-559126841562714748108312445109931201155140841248011806-97433434356443442710192752111820462625186351806917391-10891854020305219021404204642100515924371125091343014103
Percentage of SegmentReportingInformationConsolidatedAverageAssets0.00.00.00.00.0101.710.412.611.8118.910.39.310.38.412.110.910.4-9.839.439.040.463.018.320.420.438.319.619.519.0248.720.022.023.069.421.822.719.126.916.718.118.8

ntrs:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value3145529330369296622906562261102608626108-482646326823266610266012673626237241252742482624308152606122210225282422923228032286139023530
Percentage of SegmentReportingInformationConsolidatedAverageAssets25.3157.326.125.524.3-11.321.421.121.0-5.421.822.722.9-0.122.923.323.124.323.022.222.61.424.821.522.51.524.124.625.0-89.125.4

ntrs:SegmentReportingInformationFullyTaxableEquivalentAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value89777121098161288576666667668977791110999101010999
Percentage of SegmentReportingInformationFullyTaxableEquivalentAdjustment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:TreasuryManagementFees



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1110111111111213141313141415151616161616161616161617171716161617171717181818191920
Percentage of TreasuryManagementFees100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-22-12-14-17-20-16-21-23-35-16-35-34-18-35-28-24-12-10-15-16-10-4-12-14-3-18-6-18-1-262151915010914131313
Percentage of AccretionAmortizationOfDiscountsAndPremiumsInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value1616161615141412111212
Percentage of AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllocatedShareBasedCompensationExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value5316171855211933562121285620202025171619221618202317171820151617241515152211111117
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AwardType

us-gaap:EmployeeStockOption



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value00000000000160006111622263346
Percentage of AllocatedShareBasedCompensationExpense0.41.82.31.10.92.82.62.11.43.74.23.511.24.44.44.024.85.77.78.926.212.812.210.427.720.520.723.533.7

us-gaap:PerformanceShares



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-31
Value12231531494128444343
Percentage of AllocatedShareBasedCompensationExpense24.016.817.128.217.943.415.922.742.015.222.122.515.922.021.414.8

us-gaap:RestrictedStockUnitsRSU



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value4012141539161518461415154115151415121113131112141411121112
Percentage of AllocatedShareBasedCompensationExpense75.777.780.981.870.973.779.554.582.767.473.154.573.673.873.573.559.373.170.269.859.068.370.673.861.067.867.665.060.5

us-gaap:TitleOfIndividual, us-gaap:AwardType

ntrs:RetirementEligibleEmployees, us-gaap:EmployeeStockOption



Period End2020-03-312019-03-31
Value2321
Percentage of AllocatedShareBasedCompensationExpense43.138.3

ntrs:RetirementEligibleEmployees, us-gaap:PerformanceShares



Period End2020-03-312019-06-302019-03-312018-06-30
Value100910
Percentage of AllocatedShareBasedCompensationExpense20.10.016.631.9

ntrs:RetirementEligibleEmployees, us-gaap:RestrictedStockUnitsRSU



Period End2020-03-312019-03-31
Value43
Percentage of AllocatedShareBasedCompensationExpense8.06.0

us-gaap:AmortizationOfESOPAward



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value54171855193356
Percentage of AmortizationOfESOPAward100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value54171855221933562221285620202026171719231718182317181820161617241515
Percentage of AmortizationOfESOPAward100.0100.0100.0100.00.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AmortizationOfIntangibleAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value444444444465233334
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:OtherIntangibleAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value444444444422222222224445455555554652
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0100.0100.0100.0100.0

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value0000000000001001111334111115151486610
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount0.00.00.00.00.00.00.00.00.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedComputerSoftwareAmortization1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value918684838483828583
Percentage of CapitalizedComputerSoftwareAmortization1100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect



Period End2020-03-312019-12-312019-03-312018-12-31
Value1374-578492-491
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0

us-gaap:InformationByCategoryOfDebtSecurity

us-gaap:CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths

ntrs:ForeignCurrencyDenominate



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value-2-56-300
Percentage of CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths100.0100.0100.0100.0100.0100.0

ntrs:ForeignCurrencyDenominatedInvestmentSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value16-1316001
Percentage of CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths-650.0268.0258.15.1-150.0-550.0

us-gaap:AvailableforsaleSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value-400000.0100000.0100000.0500000.0-800000.0-100000.0
Percentage of CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths15.4-2.01.6-12.8400.050.0

us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation

us-gaap:ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1

us-gaap:InterestRateContract, us-gaap:InterestExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value150-4251612836-8-15-21-200-5
Percentage of ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestRateContract, us-gaap:InterestIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-763-14-48-35-63131054217-24
Percentage of ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1-50.5-7.3-29.0-78.9-124.2-174.8-146.1-68.4-247.9-107.47800.0464.2

us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation

us-gaap:ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1

us-gaap:InterestRateContract, us-gaap:InterestExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-15042-51-61-28-36815212005
Percentage of ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestRateContract, us-gaap:InterestIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value76-314483563-13-10-54-21-724
Percentage of ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1-50.5-7.3-29.0-78.9-124.2-174.8-146.1-68.4-247.9-107.47800.0464.2

us-gaap:CommonStockDividendsPerShareDeclared



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312011-03-312010-03-31
Value0.70.70.60.60.550.420.420.280.28
Percentage of CommonStockDividendsPerShareDeclared100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementClassOfStock

us-gaap:SeriesEPreferredStock



Period End2020-01-21
Value476.5278
Percentage of CommonStockDividendsPerShareDeclared0.0

us-gaap:DebtSecuritiesAvailableForSaleRealizedGain



Period End2020-03-312019-03-31
Value01
Percentage of DebtSecuritiesAvailableForSaleRealizedGain100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss



Period End2020-03-312019-03-31
Value0.0-200000.0
Percentage of DebtSecuritiesAvailableForSaleRealizedGainLoss0.0100.0

us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss



Period End2020-03-312019-03-31
Value01
Percentage of DebtSecuritiesAvailableForSaleRealizedLoss100.0100.0

us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLossRecovery

ntrs:CoveredBonds



Period End2020-03-31
Value0.0
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLossRecovery0.0

ntrs:NonUSTreasuryandGovernment



Period End2020-03-31
Value0.0
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLossRecovery0.0

ntrs:SubSovereignSupranationalAndNonUsAgencyBonds



Period End2020-03-31
Value0.0
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLossRecovery0.0

us-gaap:CertificatesOfDeposit



Period End2020-03-31
Value0.0
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLossRecovery0.0

us-gaap:CorporateDebtSecurities



Period End2020-03-31
Value0.0
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLossRecovery0.0

us-gaap:OtherDebtSecurities



Period End2020-03-31
Value0.0
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLossRecovery0.0

us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLossWriteoff

ntrs:CoveredBonds



Period End2020-03-31
Value0.0
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLossWriteoff0.0

ntrs:NonUSTreasuryandGovernment



Period End2020-03-31
Value0.0
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLossWriteoff0.0

ntrs:SubSovereignSupranationalAndNonUsAgencyBonds



Period End2020-03-31
Value0.0
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLossWriteoff0.0

us-gaap:CertificatesOfDeposit



Period End2020-03-31
Value0.0
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLossWriteoff0.0

us-gaap:CorporateDebtSecurities



Period End2020-03-31
Value0.0
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLossWriteoff0.0

us-gaap:OtherDebtSecurities



Period End2020-03-31
Value0.0
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLossWriteoff0.0

us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesHeldToMaturityChangeInPresentValueExpenseReversal

ntrs:CoveredBonds



Period End2020-03-31
Value0.0
Percentage of DebtSecuritiesHeldToMaturityChangeInPresentValueExpenseReversal0.0

ntrs:NonUSTreasuryandGovernment



Period End2020-03-31
Value0.0
Percentage of DebtSecuritiesHeldToMaturityChangeInPresentValueExpenseReversal0.0

ntrs:SubSovereignSupranationalAndNonUsAgencyBonds



Period End2020-03-31
Value0.0
Percentage of DebtSecuritiesHeldToMaturityChangeInPresentValueExpenseReversal0.0

us-gaap:CertificatesOfDeposit



Period End2020-03-31
Value0.0
Percentage of DebtSecuritiesHeldToMaturityChangeInPresentValueExpenseReversal0.0

us-gaap:CorporateDebtSecurities



Period End2020-03-31
Value0.0
Percentage of DebtSecuritiesHeldToMaturityChangeInPresentValueExpenseReversal0.0

us-gaap:OtherDebtSecurities



Period End2020-03-31
Value0.0
Percentage of DebtSecuritiesHeldToMaturityChangeInPresentValueExpenseReversal0.0

us-gaap:DebtSecuritiesHeldToMaturityCreditLossExpenseReversal



Period End2020-03-312019-03-31
Value20
Percentage of DebtSecuritiesHeldToMaturityCreditLossExpenseReversal100.00.0

us-gaap:FinancialInstrument

ntrs:CoveredBonds



Period End2020-03-31
Value100000.0
Percentage of DebtSecuritiesHeldToMaturityCreditLossExpenseReversal3.4

ntrs:NonUSTreasuryandGovernment



Period End2020-03-31
Value100000.0
Percentage of DebtSecuritiesHeldToMaturityCreditLossExpenseReversal3.4

ntrs:SubSovereignSupranationalAndNonUsAgencyBonds



Period End2020-03-31
Value400000.0
Percentage of DebtSecuritiesHeldToMaturityCreditLossExpenseReversal13.8

us-gaap:CertificatesOfDeposit



Period End2020-03-31
Value200000.0
Percentage of DebtSecuritiesHeldToMaturityCreditLossExpenseReversal6.9

us-gaap:CorporateDebtSecurities



Period End2020-03-31
Value1
Percentage of DebtSecuritiesHeldToMaturityCreditLossExpenseReversal65.5

us-gaap:OtherDebtSecurities



Period End2020-03-31
Value200000.0
Percentage of DebtSecuritiesHeldToMaturityCreditLossExpenseReversal6.9

us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanActuarialGainLoss

country:US, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-8-200-4-4-4133-7-7-7-128-4
Percentage of DefinedBenefitPlanActuarialGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0-20000100000000-2500
Percentage of DefinedBenefitPlanActuarialGainLoss3.410.24.74.72.37.64.34.34.2-0.58.50.00.00.00.00.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPostretirementHealthCoverage



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-30
Value0-10006000000-200
Percentage of DefinedBenefitPlanActuarialGainLoss-2.30.5-4.7-7.0-7.05.0-0.0-0.0-0.0-0.2-0.00.00.00.00.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-1-17-1-1-115-1-1-1-17-1-1-1-3-1-1
Percentage of DefinedBenefitPlanActuarialGainLoss20.58.932.632.632.611.427.125.725.413.431.90.00.00.00.00.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-30
Value0.0100000.00.0100000.00.00.0100000.0100000.00.0100000.0100000.00.0100000.00.0100000.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit0.0100.00.0100.00.00.0100.0100.00.0100.0100.00.0100.00.0100.0

us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanBenefitObligationIncreaseDecreaseForRemeasurementDueToSettlement

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-03-31
Value200000.00.0
Percentage of DefinedBenefitPlanBenefitObligationIncreaseDecreaseForRemeasurementDueToSettlement100.00.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanContributionsByEmployer

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value03000-280050000
Percentage of DefinedBenefitPlanContributionsByEmployer0.0100.00.00.00.0100.00.00.0100.00.00.00.0

us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

country:US, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value1921212121222222222323
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0110111111111011
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets3.66.94.64.14.65.05.05.05.05.14.70.00.00.00.00.0

us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanInterestCost

country:US, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value1011111111111111111111
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0101111111110111
Percentage of DefinedBenefitPlanInterestCost6.58.57.68.58.59.19.09.09.09.68.80.00.00.00.00.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPostretirementHealthCoverage



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value200000.0300000.0300000.0300000.0300000.0300000.0300000.0400000.0300000.0300000.0300000.0400000.0400000.0400000.0400000.0300000.0
Percentage of DefinedBenefitPlanInterestCost1.92.52.52.52.52.72.73.62.72.62.60.00.00.00.00.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value1111111111111111
Percentage of DefinedBenefitPlanInterestCost11.111.912.711.912.711.811.712.611.711.311.40.00.00.00.00.0

us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

country:US, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value124444666622
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value1000000100100400
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost8.38.712.817.012.811.19.516.19.240.945.50.00.00.00.00.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPostretirementHealthCoverage



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0.00.0100000.00.00.0300000.0300000.0400000.0300000.0300000.0400000.0400000.0400000.0400000.0400000.0400000.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost0.00.02.10.00.04.84.86.54.613.618.20.00.00.00.00.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value4343344443333333
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost33.984.885.183.083.068.368.371.064.6168.2177.30.00.00.00.00.0

us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanServiceCost

country:US, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value11101010101010101099
Percentage of DefinedBenefitPlanServiceCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value500000.0500000.0500000.0500000.0500000.0500000.0400000.0400000.0400000.0400000.00.00.00.0
Percentage of DefinedBenefitPlanServiceCost4.24.84.84.84.84.93.83.93.84.20.00.00.0

us-gaap:RetirementPlanType

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value1111111110100000
Percentage of DefinedBenefitPlanServiceCost9.39.610.69.69.610.79.610.710.69.510.40.00.00.00.00.0

us-gaap:DepreciationNonproduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value282626242426262727272623232222222223202323222123232223242222212222212124222326
Percentage of DepreciationNonproduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:DerivativeGainLossOnDerivativeNet

ntrs:OtherFinancialObligations, us-gaap:NotDesignatedAsHedgingInstrumentEconomicHedge, us-gaap:OtherIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value2-2-6-4-72-9-7-4-4-4-1
Percentage of DerivativeGainLossOnDerivativeNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignExchangeContract, us-gaap:NotDesignatedAsHedgingInstrumentEconomicHedge, us-gaap:OtherIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value00-100-20-546-56
Percentage of DerivativeGainLossOnDerivativeNet3.4-4.528.119.5-12.3-95.28.469.2-100.0-122.4147.5-457.1

us-gaap:ForeignExchangeContract, us-gaap:NotDesignatedAsHedgingInstrumentTrading, ntrs:ForeignExchangeTradingIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value886459606678717878624949
Percentage of DerivativeGainLossOnDerivativeNet3065.5-2931.8-932.8-1475.6-906.83719.0-754.7-1011.5-1962.5-1281.6-1227.5-3564.3

us-gaap:InterestRateContract, us-gaap:NotDesignatedAsHedgingInstrumentTrading, ntrs:SecurityCommissionsAndTradingIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value1134211121224
Percentage of DerivativeGainLossOnDerivativeNet379.3-168.2-76.6-68.3-20.581.0-14.7-37.2-42.5-49.0-67.5-314.3

us-gaap:HedgingDesignation

us-gaap:Nondesignated



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value1026656586179626801-95-1-4-3-61-3-6-4-8-5-101006-1-374-1
Percentage of DerivativeGainLossOnDerivativeNet3548.3-3004.5-881.2-1424.4-839.73804.8-661.1-879.5-0.0-22.4247.5-357.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NotDesignatedAsHedgingInstrumentEconomicHedge



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value3-2-8-4-60-10-1301-95
Percentage of DerivativeGainLossOnDerivativeNet103.495.5128.1119.587.74.8108.4169.2-0.0-22.4247.5-357.1

us-gaap:NotDesignatedAsHedgingInstrumentTrading



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value996864636779738180655154
Percentage of DerivativeGainLossOnDerivativeNet3444.8-3100.0-1009.4-1543.9-927.43800.0-769.5-1048.7-2005.0-1330.6-1295.0-3878.6

us-gaap:DividendsCommonStock



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value1481511301331239596
Percentage of DividendsCommonStock100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value14815113013312312395969697888988878383848485787879797475757572727301406868686868686868
Percentage of DividendsCommonStock100.0100.0100.0100.00.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DividendsPreferredStock



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value191751717517
Percentage of DividendsPreferredStock100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value1917517517517517520555555559
Percentage of DividendsPreferredStock100.0100.0100.0100.00.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents



Period End2020-03-312019-12-312019-03-312018-12-31
Value-1487337-7
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1344413548148810217779667866786667566965584446
Percentage of EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByLiabilityClass

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings

ntrs:VisaConversionRateSwap



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value-2263508744412-22400011000
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:FairValueByLiabilityClass

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements

ntrs:VisaConversionRateSwap



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value46332382222211100100000
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0

us-gaap:FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery



Period End2020-03-312019-03-31
Value0-1
Percentage of FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery100.0100.0

us-gaap:FinancingReceivablePortfolioSegment

us-gaap:CommercialPortfolioSegment



Period End2020-03-312019-03-31
Value-600000.0-300000.0
Percentage of FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery-85.725.0

us-gaap:ConsumerPortfolioSegment



Period End2020-03-312019-03-31
Value10
Percentage of FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery185.775.0

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery



Period End2020-03-312019-03-31
Value12
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery100.0100.0

us-gaap:FinancingReceivablePortfolioSegment

us-gaap:CommercialPortfolioSegment



Period End2020-03-312019-03-31
Value700000.0400000.0
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery63.618.2

us-gaap:ConsumerPortfolioSegment



Period End2020-03-312019-03-31
Value01
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery36.481.8

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs



Period End2020-03-312019-03-31
Value11
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs100.0100.0

us-gaap:FinancingReceivablePortfolioSegment

us-gaap:ConsumerPortfolioSegment



Period End2020-03-312019-03-31
Value10
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs94.490.0

us-gaap:FinancingReceivableModificationsNumberOfContracts2



Period End2020-03-31
Value8.0
Percentage of FinancingReceivableModificationsNumberOfContracts2100.0

us-gaap:FinancingReceivablePortfolioSegment

us-gaap:CommercialPortfolioSegment



Period End2020-03-312019-03-31
Value2.01.0
Percentage of FinancingReceivableModificationsNumberOfContracts225.00.0

us-gaap:ConsumerPortfolioSegment



Period End2020-03-312019-03-31
Value6.013.0
Percentage of FinancingReceivableModificationsNumberOfContracts275.00.0

us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:CommercialPortfolioSegment, ntrs:CommercialAndInstitutionalLoans



Period End2020-03-312019-03-31
Value2.01.0
Percentage of FinancingReceivableModificationsNumberOfContracts225.00.0

us-gaap:ConsumerPortfolioSegment, us-gaap:ResidentialRealEstate



Period End2020-03-312019-03-31
Value6.013.0
Percentage of FinancingReceivableModificationsNumberOfContracts275.00.0

us-gaap:FinancingReceivableModificationsPostModificationRecordedInvestment2



Period End2020-03-31
Value25
Percentage of FinancingReceivableModificationsPostModificationRecordedInvestment2100.0

us-gaap:FinancingReceivablePortfolioSegment

us-gaap:CommercialPortfolioSegment



Period End2020-03-312019-03-31
Value247
Percentage of FinancingReceivableModificationsPostModificationRecordedInvestment296.00.0

us-gaap:ConsumerPortfolioSegment



Period End2020-03-312019-03-31
Value19
Percentage of FinancingReceivableModificationsPostModificationRecordedInvestment24.00.0

us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:CommercialPortfolioSegment, ntrs:CommercialAndInstitutionalLoans



Period End2020-03-312019-03-31
Value247
Percentage of FinancingReceivableModificationsPostModificationRecordedInvestment296.00.0

us-gaap:ConsumerPortfolioSegment, us-gaap:ResidentialRealEstate



Period End2020-03-312019-03-31
Value19
Percentage of FinancingReceivableModificationsPostModificationRecordedInvestment24.00.0

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value88645960667871787862494948585364605262747160465250506271594044596171878084988811579
Percentage of ForeignCurrencyTransactionGainLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalService



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value855955575959516062514750495555625150607167574450484961695838415657
Percentage of ForeignCurrencyTransactionGainLossBeforeTax95.792.693.094.790.276.271.776.279.581.296.1101.4102.195.2103.096.685.595.495.496.094.394.295.795.896.096.598.497.997.893.693.995.192.9

ntrs:TreasuryAndOther



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-30
Value00001917141-1-1-2040000
Percentage of ForeignCurrencyTransactionGainLossBeforeTax0.00.00.00.027.122.619.02.4-3.0-4.0-4.70.97.10.00.00.00.0

ntrs:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value3443610110000101422343222111122
Percentage of ForeignCurrencyTransactionGainLossBeforeTax4.37.47.05.39.81.41.31.31.51.11.41.61.92.81.72.57.44.64.64.05.75.84.34.24.03.51.62.12.26.46.1

us-gaap:IncomeStatementLocation

us-gaap:GainLossOnFairValueHedgesRecognizedInEarnings

us-gaap:InterestExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-29-63-14-6819115
Percentage of GainLossOnFairValueHedgesRecognizedInEarnings100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value072551136-31-61
Percentage of GainLossOnFairValueHedgesRecognizedInEarnings17.286.8-46.7135.1-343.8247.8-54.779.5-246.720.2-609.19.9

us-gaap:GoodwillForeignCurrencyTranslationGainLoss



Period End2020-03-31
Value-7
Percentage of GoodwillForeignCurrencyTranslationGainLoss100.0

us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalService



Period End2020-03-31
Value-7
Percentage of GoodwillForeignCurrencyTranslationGainLoss98.7

ntrs:WealthManagement



Period End2020-03-31
Value-100000.0
Percentage of GoodwillForeignCurrencyTranslationGainLoss1.3

us-gaap:IncomeTaxesPaid



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value72761272052714115117129923626843157183198215-136302183401198559157892771424986142945661136103
Percentage of IncomeTaxesPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDeposits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2395610619-20514534-8838133-12982842-784164417682985-167135885532207388-283444813309-2817-6840882385208257847492182-57784476-643063-874441631013642568795749493516-846
Percentage of IncreaseDecreaseInDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDerivativeAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value3570-1114317-64-292437-67932161948-5795-572-149-737867200-9671318-862-289522364-22-505361-201318475542-122381-173-13761294-14353706-250
Percentage of IncreaseDecreaseInDerivativeAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInInterestPayableNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-5-14-3-1-321375-582501-32-22-2-6-17-1003-26-18-11212-133121-1113-114-18
Percentage of IncreaseDecreaseInInterestPayableNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInReceivables



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value122-278-141365105-443312779-15636554839-53952-1478-502198-395254178122-12632613417284-10-12934-25167-510
Percentage of IncreaseDecreaseInReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value0011101110111011101210211011100000000000
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestAndDividendIncomeOperating



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value529576620640662648599567505488453417410371349344352330305288298303293293295302291275286302323321341354347359347334330317314
Percentage of InterestAndDividendIncomeOperating100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestAndFeeIncomeLoansAndLeases



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value250263291300298292282271252241239224213202202201200190186171183182184185182184185185187198206205217219229243246245231226224
Percentage of InterestAndFeeIncomeLoansAndLeases100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestExpenseDeposits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value608512213314713810577635855412720202122211718161721222023252529334332464350706665534139
Percentage of InterestExpenseDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestExpenseFederalFundsPurchased



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value232713151613544000000000000000000000000010111
Percentage of InterestExpenseFederalFundsPurchased100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestExpenseJuniorSubordinatedDebentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value11222221111111000000000000000000000000000
Percentage of InterestExpenseJuniorSubordinatedDebentures100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestExpenseOtherLongTermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value8891010101112111011977666555789910988101313151921212415-37282811
Percentage of InterestExpenseOtherLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestExpenseOtherShortTermBorrowings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value293646494947403526181410755421111100000100111111
Percentage of InterestExpenseOtherShortTermBorrowings100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value11121112221100000000000000000000000000000
Percentage of InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncomeDepositsWithFinancialInstitutions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1216181917161518191816141414151623262728263130333236363435374443506149443733403133
Percentage of InterestIncomeDepositsWithFinancialInstitutions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncomeExpenseAfterProvisionForLoanLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value347421424423422421417411387393361348354346306302305307278261265260249246242244232215221229235249251259239236219182203182190
Percentage of InterestIncomeExpenseAfterProvisionForLoanLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncomeExpenseNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value408420417417422417408413384380354341353324303299307289268251260263249246245249237220226234245254256271256246234222233232230
Percentage of InterestIncomeExpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncomeSecuritiesTaxExempt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value00011111222222211111111122233344556667777
Percentage of InterestIncomeSecuritiesTaxExempt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncomeSecuritiesTaxable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value24125826526927726923821917717214313514312510396103978177767665636969604858596365626354554943475044
Percentage of InterestIncomeSecuritiesTaxable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestPaidNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value126169206225244228178147116113
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:MarketableSecuritiesGainLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value0000000000000-10-200000-100-40-200000
Percentage of MarketableSecuritiesGainLoss0.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0

us-gaap:NoninterestExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value10651072103610061028102110029979951001935937894873843925828824812854789781774811768794740729728741696717723771701705652641622614619
Percentage of NoninterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalService



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value659675649633648635601599585596542545510492487556475468464488434433429446423451412396398409394397398426375380339351330324
Percentage of NoninterestExpense61.962.962.662.963.062.260.060.158.859.557.958.257.156.357.960.257.356.857.257.155.155.555.555.055.156.855.654.354.755.356.655.455.055.253.653.952.154.753.152.8

ntrs:TreasuryAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value113100233928444644403741373726253143323933352529313128271630212422231616
Percentage of NoninterestExpense1.10.30.10.10.12.33.92.94.44.74.84.44.24.74.44.13.23.03.95.14.15.14.34.33.33.74.24.43.93.72.44.23.03.53.13.52.72.8

ntrs:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value394393385372379362362369365359348350346340318330326331316322321308312329318314297301301303285
Percentage of NoninterestExpense37.036.737.237.036.935.536.137.036.735.937.337.438.738.937.735.739.440.138.937.840.839.540.340.641.539.540.141.441.441.041.0

us-gaap:NoninterestIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value117911261120108910581086106610921092104499197993091791010178828678861004873866829835794795810800750735726734709683714698663674656731667
Percentage of NoninterestIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalService



Period End2020-03-312019-03-31
Value701638
Percentage of NoninterestIncome59.560.3

ntrs:TreasuryAndOther



Period End2020-03-312019-03-31
Value2-5
Percentage of NoninterestIncome0.2-0.5

ntrs:WealthManagement



Period End2020-03-312019-03-31
Value475425
Percentage of NoninterestIncome40.340.2

us-gaap:NoninterestIncomeOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value8770857363745571757174817464681757367741737477657565709971
Percentage of NoninterestIncomeOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalService



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value41365344434942454643434444344125453945434143424744474445
Percentage of NoninterestIncomeOther48.051.963.161.268.066.276.163.461.560.959.254.459.252.660.414.862.058.361.525.056.056.465.862.568.166.844.663.5

ntrs:TreasuryAndOther



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-30
Value2-6-3-5-12035104012210103415-101
Percentage of NoninterestIncomeOther3.3-7.9-4.2-8.0-22.3-1.04.66.812.96.61.370.01.50.559.65.52.06.8-2.90.82.6

ntrs:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value42363831252425262526252625252626262728262831202322205424
Percentage of NoninterestIncomeOther48.751.344.843.040.033.246.237.633.937.034.132.734.240.138.315.236.541.237.915.538.540.932.230.734.829.654.633.8

us-gaap:NoninterestIncomeOtherOperatingIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value343245382940203134344043392833141383338137384134403738673624354634383742423542273739
Percentage of NoninterestIncomeOtherOperatingIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OccupancyNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value5157535051495148515247464547444540434343434543474443434343464342414945434240424142
Percentage of OccupancyNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents

us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent

us-gaap:ForeignExchangeContract, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-03-31
Value137
Percentage of OciBeforeReclassificationsBeforeTaxAttributableToParent100.0100.0

us-gaap:InterestRateContract, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-03-31
Value400000.0600000.0
Percentage of OciBeforeReclassificationsBeforeTaxAttributableToParent3.08.3

us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-03-31
Value-111
Percentage of OciBeforeReclassificationsBeforeTaxAttributableToParent-9.8156.9

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-03-31
Value266115
Percentage of OciBeforeReclassificationsBeforeTaxAttributableToParent2006.01601.4

us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent

us-gaap:ForeignExchangeContract, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-03-31
Value105
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent100.0100.0

us-gaap:InterestRateContract, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-03-31
Value300000.0400000.0
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent3.07.3

us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-03-31
Value-18
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent-12.0149.1

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-03-31
Value19985
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent1997.01552.7

us-gaap:OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal



Period End2020-03-312019-03-31
Value110
Percentage of OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal100.0100.0

us-gaap:FinancingReceivablePortfolioSegment

us-gaap:CommercialPortfolioSegment



Period End2020-03-312019-03-31
Value110
Percentage of OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal95.785.7

us-gaap:ConsumerPortfolioSegment



Period End2020-03-312019-03-31
Value500000.0-100000.0
Percentage of OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal4.314.3

us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax

us-gaap:ForeignExchangeContract, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value30218233
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestRateContract, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value100000.00.0200000.0200000.00.00.00.0-400000.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax3.00.08.711.80.00.00.0-12.5

us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value0003-12002-25000-11000-800
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax-3.00.00.0182.4-142.90.00.078.10.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value6719552928-10-6-20-38-10
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax2033.39700.02404.31758.8338.1-382.1-209.7-637.50.00.00.0

us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent



Period End2020-03-312019-03-31
Value338149
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent100.0100.0

us-gaap:StatementEquityComponents

ntrs:AccumulatedForeignCurrencyAdjustmentAttributabletoParentOther



Period End2020-03-312019-03-31
Value-89-6
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent-26.5-4.4

ntrs:LongtermIntraentityForeignCurrencyTransactionGainsLosses



Period End2020-03-312019-03-31
Value-600000.0700000.0
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent-0.20.5

ntrs:NetInvestmentHedgeGainLoss



Period End2020-03-312019-03-31
Value14228
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent42.219.2

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-03-31
Value916
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent2.811.2

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-03-31
Value9-5
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent2.9-3.9

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-03-31
Value266115
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent78.977.4

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-03-31
Value5222
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent15.515.3

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value7-5-24-410-4-3-3
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value142-841077285237157
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax

us-gaap:ForeignExchangeContract, ntrs:OtherNoninterestIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value00100001201
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignExchangeContract, us-gaap:InterestIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value4523141917161474
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax-4100.0-1866.7192.91233.3-2400.09950.08650.01454.5591.7900.0247.1

us-gaap:InterestRateContract, us-gaap:InterestIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0.00.0-100000.0-200000.0-200000.00.0-100000.0-100000.00.0100000.0100000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax-0.0-0.0-7.1-66.733.30.0-50.0-9.10.012.55.9

us-gaap:IncomeStatementLocation

ntrs:OtherNoninterestIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value00100001201
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value4523141917151474
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax-4100.0-1866.7185.71166.7-2366.79950.08600.01445.5591.7912.5252.9

us-gaap:OtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value239-1036818510873-18-2-66-7931318-110-204488-990-753-101-133089312-66-1-6758269-1131036
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value239-1036818510873-18-2-66-7931318-110-204488-990
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent



Period End2020-03-312019-03-31
Value239108
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0

us-gaap:StatementEquityComponents

ntrs:AccumulatedForeignCurrencyAdjustmentAttributabletoParentOther



Period End2020-03-312019-03-31
Value-80-4
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent-33.5-4.5

ntrs:LongtermIntraentityForeignCurrencyTransactionGainsLosses



Period End2020-03-312019-03-31
Value-500000.0500000.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent-0.20.5

ntrs:NetInvestmentHedgeGainLoss



Period End2020-03-312019-03-31
Value10619
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent44.417.7

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-03-31
Value712
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent2.911.3

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-03-31
Value7-4
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent3.0-4.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-03-31
Value19985
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent83.379.0

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-03-31
Value2514
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent10.713.7

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value-732-4-4-1232-6-7-527-4-4-215-3-4-4-1-6-6-691-3-3-3-111-7-7-757-5-5-2289-4-5
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1



Period End2020-03-312019-03-31
Value9840
Percentage of OtherComprehensiveIncomeLossTaxPortionAttributableToParent1100.0100.0

us-gaap:StatementEquityComponents

ntrs:AccumulatedForeignCurrencyAdjustmentAttributabletoParentOther



Period End2020-03-312019-03-31
Value-9-1
Percentage of OtherComprehensiveIncomeLossTaxPortionAttributableToParent1-9.7-3.9

ntrs:LongtermIntraentityForeignCurrencyTransactionGainsLosses



Period End2020-03-312019-03-31
Value-100000.0200000.0
Percentage of OtherComprehensiveIncomeLossTaxPortionAttributableToParent1-0.10.5

ntrs:NetInvestmentHedgeGainLoss



Period End2020-03-312019-03-31
Value369
Percentage of OtherComprehensiveIncomeLossTaxPortionAttributableToParent136.823.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-03-31
Value24
Percentage of OtherComprehensiveIncomeLossTaxPortionAttributableToParent12.510.8

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-03-31
Value2-1
Percentage of OtherComprehensiveIncomeLossTaxPortionAttributableToParent12.4-3.7

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-03-31
Value6729
Percentage of OtherComprehensiveIncomeLossTaxPortionAttributableToParent168.173.3

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-03-31
Value268
Percentage of OtherComprehensiveIncomeLossTaxPortionAttributableToParent127.019.6

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value199-76571628584-32-19-55-61-2119-95-133374-83-7-2254-10-5334-205-811-6351120-121303-614712
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherNoninterestExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value618892767289977569929282657771141747465114737169626998676680836362737462567476626367
Percentage of OtherNoninterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherOperatingIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value343245382940203134
Percentage of OtherOperatingIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForProceedsFromLoansAndLeases



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value6432549-123361-18751144-1109389-491-740-178-378-153231-1134422950-1834363241004936331044274369258-9-637-30-4845197383143693-201313-497468195
Percentage of PaymentsForProceedsFromLoansAndLeases100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForProceedsFromOtherInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value153267-21197-378222-34-8977437218-56-226729-586-75-293394414-191-404116-22925416-761898-217-29123-151043-223-150301-89-52856721-582
Percentage of PaymentsForProceedsFromOtherInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForRepurchaseOfPreferredStockAndPreferenceStock



Period End2020-03-312019-03-31
Value4000
Percentage of PaymentsForRepurchaseOfPreferredStockAndPreferenceStock100.00.0

us-gaap:PaymentsForSoftware



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value9413795126811191149479931089979111968865106808068927584748973706089515047541473696747
Percentage of PaymentsForSoftware100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsOfDividendsCommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1471481291311201219494959587878686818282838377777775747574747011447368676868686868696767
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsOfDividendsPreferredStockAndPreferenceStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value5175175175175175205555555590
Percentage of PaymentsOfDividendsPreferredStockAndPreferenceStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt



Period End2020-03-312019-03-31
Value28571834
Percentage of PaymentsToAcquireAvailableForSaleSecuritiesDebt100.0100.0

us-gaap:PaymentsToAcquireHeldToMaturitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value707642923540259637245556526551295511460826222440228428153180128812878582503261121011541183812912467646139714892182258722113453461339486610255224
Percentage of PaymentsToAcquireHeldToMaturitySecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionContributions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value10300320071300113009400164001340016870012890010480020
Percentage of PensionContributions100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0

us-gaap:PreferredStockDividendsIncomeStatementImpact



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value305175175175175175205555555590
Percentage of PreferredStockDividendsIncomeStatementImpact100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:StatementClassOfStock

us-gaap:PreferredStockRedemptionPremium

us-gaap:SeriesCPreferredStock



Period End2020-03-31
Value11
Percentage of PreferredStockRedemptionPremium100.0

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value628738422175432459485702508945664678274423222406245020347565087261340347315362781402165912485971338125916221633125276856143774088675110555215
Percentage of ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromPaymentsForFederalFundsSoldAndSecuritiesPurchasedUnderAgreementsToResellNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-362-130106-111620317-9898-211342442-1595272-195-106-143-356-23593-51-52-430-6919-245-3-29-190307-345268-169100-1754370268-166-11199
Percentage of ProceedsFromPaymentsForFederalFundsSoldAndSecuritiesPurchasedUnderAgreementsToResellNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromPaymentsForInInterestBearingDepositsInBanks



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-757-812121-323400-1575134564366067-651443-3277691192-772716-3831274206-1242-2009192492329-193298160108544-905428-21742247-2330277-1540749-28242662-3034
Percentage of ProceedsFromPaymentsForInInterestBearingDepositsInBanks100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-45522414084-128121-934171-233106030-40171-26358-3962454-583-27118-52183-180448-308287-209317149-51-914859-1139680-15624972-40-364
Percentage of ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities



Period End2020-03-312019-12-312019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312011-03-312010-03-31
Value8-101000001-52-50-138-592747-76-50733527229-577626-520114
Percentage of ProceedsFromPaymentsForOtherFinancingActivities100.0100.00.0100.0100.00.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess



Period End2020-03-312019-03-31
Value-778-158
Percentage of ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess100.0100.0

us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value24304147313720581714279821241991204424951787258432353769311520152416247228661550168622214069238128032097159710323728202735597148844865986999489645882658285215824338
Percentage of ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt



Period End2020-03-312019-03-31
Value280127
Percentage of ProceedsFromSaleOfAvailableForSaleSecuritiesDebt100.0100.0

us-gaap:ProceedsFromStockOptionsExercised



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value824103528219241233371713521551243325521554122657512826213016161626134494
Percentage of ProceedsFromStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProfessionalFees



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value192205194186188195186185171175172167153160157159149155158147135143142144144152145136129140126133128154139134124129110114105
Percentage of ProfessionalFees100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProvisionForLoanLossesExpensed



Period End2020-03-312019-03-31
Value450
Percentage of ProvisionForLoanLossesExpensed100.0100.0

us-gaap:FinancingReceivablePortfolioSegment

us-gaap:CommercialPortfolioSegment



Period End2020-03-312019-03-31
Value410
Percentage of ProvisionForLoanLossesExpensed91.928.6

us-gaap:ConsumerPortfolioSegment



Period End2020-03-312019-03-31
Value30
Percentage of ProvisionForLoanLossesExpensed8.171.4

us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent

us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLoss



Period End2020-03-312019-03-31
Value-10-5
Percentage of ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent100.0100.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-03-31
Value413
Percentage of ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent-36.7-247.3

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-03-31
Value0.0-200000.0
Percentage of ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent-0.03.6

us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent

us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLoss



Period End2020-03-312019-03-31
Value-8-4
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent100.0100.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-03-31
Value310
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent-36.1-242.9

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-03-312018-12-31
Value0.0-200000.00.0
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent-0.04.80.0

us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAociCurrentPeriodTax

us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLoss



Period End2020-03-312019-03-31
Value-2-1
Percentage of ReclassificationFromAociCurrentPeriodTax100.0100.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value111034444
Percentage of ReclassificationFromAociCurrentPeriodTax-38.50.00.00.0-261.50.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value0.0-300000.00.00.00.0-100000.00.00.00.0-100000.0-200000.0-200000.0-100000.00.0200000.00.0100000.00.00.0-200000.0
Percentage of ReclassificationFromAociCurrentPeriodTax-0.00.00.00.0-0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value1373211126226102
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:TreasuryStock



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value13732111261122610237244411919651257610174792216019972528598722188252211357
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.0100.0100.00.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockIssuedDuringPeriodValueTreasuryStockReissued



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-129-21-8-120-14-3-83
Percentage of StockIssuedDuringPeriodValueTreasuryStockReissued100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-129-21-8-120-14-3-83
Percentage of StockIssuedDuringPeriodValueTreasuryStockReissued100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRedeemedOrCalledDuringPeriodValue



Period End2020-03-31
Value400
Percentage of StockRedeemedOrCalledDuringPeriodValue100.0

us-gaap:StatementEquityComponents

us-gaap:PreferredStock



Period End2020-03-31
Value388
Percentage of StockRedeemedOrCalledDuringPeriodValue97.1

us-gaap:RetainedEarnings



Period End2020-03-31
Value11
Percentage of StockRedeemedOrCalledDuringPeriodValue2.9

us-gaap:TransferToOtherRealEstate



Period End2020-03-312019-12-312019-03-312018-12-31
Value200000.0900000.00.0100000.0
Percentage of TransferToOtherRealEstate100.0100.00.0100.0

us-gaap:TreasuryStockValueAcquiredCostMethod



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-31
Value296264307271257234235190263170124157706414014014096107
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:TreasuryStock



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value296307271257234235190263170124157706565140140152140961071657774163122971574624936141140361013
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.2100.0100.00.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value344345455544454443343333223
Percentage of UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

ntrs:AffordableHousingInvestment

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value746749650589589606541472405415345223209215202187199177178186198210223204219227230242275
Percentage of AffordableHousingInvestment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value746749650589589606541472405415333215209218195182193173176187198209225205216228217229253
Percentage of AffordableHousingInvestment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.096.896.8100.0101.696.897.096.898.098.8100.699.899.6100.6100.398.4100.194.794.792.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value746749650589589606541472405415345223209215202187199177178186198210223204219227230242275
Percentage of AffordableHousingInvestment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:AllowanceForCreditLoss



Period End2020-03-312019-12-31
Value198124
Percentage of AllowanceForCreditLoss100.0100.0

ntrs:AllowanceForCreditLossExcludingOffBalanceSheetCreditLossLiability



Period End2020-03-312019-12-31
Value157104
Percentage of AllowanceForCreditLossExcludingOffBalanceSheetCreditLossLiability100.0100.0

ntrs:ClientSecuritySettlementReceivables



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value211684521021311206716461541202758116471274170715591043198422171902215719182034221915681538159618451355163014868162049107872498577894815771304701794
Percentage of ClientSecuritySettlementReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value211684521021311206716461541202758116471274170715591043198422171902215719182034221915681538159618451355163014862049
Percentage of ClientSecuritySettlementReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value211684521021311206716461541202758116471274170715591043198422171902215719182034221915681538159618451355163014862049
Percentage of ClientSecuritySettlementReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value211684521021311206716461541202758116471274170715591043198422171902215719182034221915681538159618451355163014862049
Percentage of ClientSecuritySettlementReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss



Period End2020-03-312019-12-31
Value110119
Percentage of DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss100.0100.0

ntrs:DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss



Period End2020-03-312019-12-31
Value7482
Percentage of DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss100.0100.0

ntrs:CreditRatingMoodysAndStandardPoors

ntrs:DebtSecuritiesHeldToMaturityPercentOfPortfolio

ntrs:MoodysAndStandardPoorsAARating



Period End2020-03-31
Value0.19
Percentage of DebtSecuritiesHeldToMaturityPercentOfPortfolio100.0

ntrs:MoodysAndStandardPoorsARating



Period End2020-03-31
Value0.19
Percentage of DebtSecuritiesHeldToMaturityPercentOfPortfolio100.0

ntrs:MoodysAndStandardPoorsNotRated



Period End2020-03-31
Value0.11
Percentage of DebtSecuritiesHeldToMaturityPercentOfPortfolio57.9

us-gaap:FinancialInstrument

us-gaap:USTreasuryAndGovernment



Period End2020-03-31
Value0.51
Percentage of DebtSecuritiesHeldToMaturityPercentOfPortfolio268.4

ntrs:DerivativeAssetNotOffset



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value341623153015121624
Percentage of DerivativeAssetNotOffset100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:DerivativeAssetNotSubjecttoMasterNettingArrangementNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value1366543454379514561516877448
Percentage of DerivativeAssetNotSubjecttoMasterNettingArrangementNet100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellCollateral



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value998707525654515103114581417150413031605208719331967205018481600
Percentage of DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellCollateral100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:DerivativeLiabilityNotOffset



Period End2020-03-312019-12-31
Value10
Percentage of DerivativeLiabilityNotOffset100.0100.0

ntrs:DerivativeLiabilityNotSubjectToMasterNettingArrangementNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value7621000377399321441304495825
Percentage of DerivativeLiabilityNotSubjectToMasterNettingArrangementNet100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:DerivativeLiabilitySecuritiesSoldUnderAgreementToRepurchaseCollateral



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value344892651253916846981810834523463433473301565546
Percentage of DerivativeLiabilitySecuritiesSoldUnderAgreementToRepurchaseCollateral100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:FederalReserveAndForeignCentralBankDeposits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value446613388622493275532342230080328313342229446404793406028988259592667422208230352923695
Percentage of FederalReserveAndForeignCentralBankDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value446613388622493275532342230080328313342229446404793406028988259592667420662303523695
Percentage of FederalReserveAndForeignCentralBankDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.09.3100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value446613388622493275532342230080328313342229446404793406028988259592667420662303523695
Percentage of FederalReserveAndForeignCentralBankDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.09.3100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value4466133886224932755323422300803283133422294464047934060289882595926674222082303523695
Percentage of FederalReserveAndForeignCentralBankDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:FinancingReceivableAccrual



Period End2020-03-312019-12-31
Value3773331326
Percentage of FinancingReceivableAccrual100.0100.0

us-gaap:FinancingReceivablePortfolioSegment

us-gaap:CommercialPortfolioSegment



Period End2020-03-312019-12-31
Value1970113990
Percentage of FinancingReceivableAccrual52.244.7

us-gaap:ConsumerPortfolioSegment



Period End2020-03-312019-12-31
Value1803217335
Percentage of FinancingReceivableAccrual47.855.3

us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:CommercialPortfolioSegment, ntrs:CommercialAndInstitutionalLoans



Period End2020-03-312019-12-31
Value122949083
Percentage of FinancingReceivableAccrual32.629.0

us-gaap:CommercialPortfolioSegment, ntrs:ForeignCommercialLoans



Period End2020-03-312019-12-31
Value39231576
Percentage of FinancingReceivableAccrual10.45.0

us-gaap:CommercialPortfolioSegment, ntrs:LeaseFinancing



Period End2020-03-312019-12-31
Value6465
Percentage of FinancingReceivableAccrual0.20.2

us-gaap:CommercialPortfolioSegment, ntrs:OtherCommercialLoan



Period End2020-03-312019-12-31
Value336164
Percentage of FinancingReceivableAccrual0.90.5

us-gaap:CommercialPortfolioSegment, us-gaap:CommercialRealEstate



Period End2020-03-312019-12-31
Value30823100
Percentage of FinancingReceivableAccrual8.29.9

us-gaap:ConsumerPortfolioSegment, ntrs:ForeignConsumerLoans



Period End2020-03-312019-12-31
Value346174
Percentage of FinancingReceivableAccrual0.90.6

us-gaap:ConsumerPortfolioSegment, ntrs:OtherConsumerLoan



Period End2020-03-312019-12-31
Value6967
Percentage of FinancingReceivableAccrual0.20.2

us-gaap:ConsumerPortfolioSegment, ntrs:PrivateClient



Period End2020-03-312019-12-31
Value1160911070
Percentage of FinancingReceivableAccrual30.835.3

us-gaap:ConsumerPortfolioSegment, us-gaap:ResidentialRealEstate



Period End2020-03-312019-12-31
Value60076023
Percentage of FinancingReceivableAccrual15.919.2

ntrs:FinancingReceivableAccruedInterestAfterAllowanceForCreditLoss



Period End2020-03-312019-12-31
Value8284
Percentage of FinancingReceivableAccruedInterestAfterAllowanceForCreditLoss100.0100.0

ntrs:FinancingReceivableAccruedInterestWriteoff



Period End2020-03-31
Value1
Percentage of FinancingReceivableAccruedInterestWriteoff100.0

us-gaap:FinancingReceivablePortfolioSegment

us-gaap:CommercialPortfolioSegment



Period End2020-03-31
Value500000.0
Percentage of FinancingReceivableAccruedInterestWriteoff38.5

us-gaap:ConsumerPortfolioSegment



Period End2020-03-31
Value800000.0
Percentage of FinancingReceivableAccruedInterestWriteoff61.5

ntrs:FinancingReceivableAllowanceForCreditLossesAndOffBalanceSheetCreditLossLiability



Period End2020-03-312019-12-31
Value187124
Percentage of FinancingReceivableAllowanceForCreditLossesAndOffBalanceSheetCreditLossLiability100.0100.0

us-gaap:FinancingReceivablePortfolioSegment

us-gaap:CommercialPortfolioSegment



Period End2020-03-312019-12-31
Value13373
Percentage of FinancingReceivableAllowanceForCreditLossesAndOffBalanceSheetCreditLossLiability71.259.4

us-gaap:ConsumerPortfolioSegment



Period End2020-03-312019-12-31
Value5450
Percentage of FinancingReceivableAllowanceForCreditLossesAndOffBalanceSheetCreditLossLiability28.840.6

ntrs:FinancingReceivableNonaccrualIncludingOtherRealEstateOwned



Period End2020-03-312019-12-31
Value10586
Percentage of FinancingReceivableNonaccrualIncludingOtherRealEstateOwned100.0100.0

ntrs:FinancingReceivableNonaccrualTroubledDebtRestructuring



Period End2020-03-312019-12-31
Value7354
Percentage of FinancingReceivableNonaccrualTroubledDebtRestructuring100.0100.0

ntrs:FinancingReceivableRevolvingConvertedToTermLoan



Period End2020-03-31
Value371
Percentage of FinancingReceivableRevolvingConvertedToTermLoan100.0

us-gaap:FinancingReceivablePortfolioSegment

us-gaap:CommercialPortfolioSegment



Period End2020-03-31
Value86
Percentage of FinancingReceivableRevolvingConvertedToTermLoan23.3

us-gaap:ConsumerPortfolioSegment



Period End2020-03-31
Value284
Percentage of FinancingReceivableRevolvingConvertedToTermLoan76.7

us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:CommercialPortfolioSegment, ntrs:CommercialAndInstitutionalLoans



Period End2020-03-31
Value58
Percentage of FinancingReceivableRevolvingConvertedToTermLoan15.7

us-gaap:CommercialPortfolioSegment, ntrs:ForeignCommercialLoans



Period End2020-03-31
Value1
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.5

us-gaap:CommercialPortfolioSegment, ntrs:LeaseFinancing



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

us-gaap:CommercialPortfolioSegment, ntrs:OtherCommercialLoan



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

us-gaap:CommercialPortfolioSegment, us-gaap:CommercialRealEstate



Period End2020-03-31
Value26
Percentage of FinancingReceivableRevolvingConvertedToTermLoan7.1

us-gaap:ConsumerPortfolioSegment, ntrs:ForeignConsumerLoans



Period End2020-03-31
Value5
Percentage of FinancingReceivableRevolvingConvertedToTermLoan1.4

us-gaap:ConsumerPortfolioSegment, ntrs:OtherConsumerLoan



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

us-gaap:ConsumerPortfolioSegment, ntrs:PrivateClient



Period End2020-03-31
Value274
Percentage of FinancingReceivableRevolvingConvertedToTermLoan73.9

us-gaap:ConsumerPortfolioSegment, us-gaap:ResidentialRealEstate



Period End2020-03-31
Value5
Percentage of FinancingReceivableRevolvingConvertedToTermLoan1.4

us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:CommercialPortfolioSegment, ntrs:CommercialAndInstitutionalLoans, ntrs:FourToFiveInternalGrade



Period End2020-03-31
Value51
Percentage of FinancingReceivableRevolvingConvertedToTermLoan13.8

us-gaap:CommercialPortfolioSegment, ntrs:CommercialAndInstitutionalLoans, ntrs:OneToThreeInternalGrade



Period End2020-03-31
Value4
Percentage of FinancingReceivableRevolvingConvertedToTermLoan1.3

us-gaap:CommercialPortfolioSegment, ntrs:CommercialAndInstitutionalLoans, ntrs:SixToNineInternalGrade



Period End2020-03-31
Value2
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.6

us-gaap:CommercialPortfolioSegment, ntrs:ForeignCommercialLoans, ntrs:FourToFiveInternalGrade



Period End2020-03-31
Value1
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.5

us-gaap:CommercialPortfolioSegment, ntrs:ForeignCommercialLoans, ntrs:OneToThreeInternalGrade



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

us-gaap:CommercialPortfolioSegment, ntrs:ForeignCommercialLoans, ntrs:SixToNineInternalGrade



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

us-gaap:CommercialPortfolioSegment, ntrs:LeaseFinancing, ntrs:FourToFiveInternalGrade



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

us-gaap:CommercialPortfolioSegment, ntrs:LeaseFinancing, ntrs:OneToThreeInternalGrade



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

us-gaap:CommercialPortfolioSegment, ntrs:LeaseFinancing, ntrs:SixToNineInternalGrade



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

us-gaap:CommercialPortfolioSegment, ntrs:OtherCommercialLoan, ntrs:FourToFiveInternalGrade



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

us-gaap:CommercialPortfolioSegment, ntrs:OtherCommercialLoan, ntrs:OneToThreeInternalGrade



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

us-gaap:CommercialPortfolioSegment, ntrs:OtherCommercialLoan, ntrs:SixToNineInternalGrade



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

us-gaap:CommercialPortfolioSegment, us-gaap:CommercialRealEstate, ntrs:FourToFiveInternalGrade



Period End2020-03-31
Value20
Percentage of FinancingReceivableRevolvingConvertedToTermLoan5.4

us-gaap:CommercialPortfolioSegment, us-gaap:CommercialRealEstate, ntrs:OneToThreeInternalGrade



Period End2020-03-31
Value6
Percentage of FinancingReceivableRevolvingConvertedToTermLoan1.6

us-gaap:CommercialPortfolioSegment, us-gaap:CommercialRealEstate, ntrs:SixToNineInternalGrade



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

us-gaap:ConsumerPortfolioSegment, ntrs:ForeignConsumerLoans, ntrs:FourToFiveInternalGrade



Period End2020-03-31
Value5
Percentage of FinancingReceivableRevolvingConvertedToTermLoan1.4

us-gaap:ConsumerPortfolioSegment, ntrs:ForeignConsumerLoans, ntrs:OneToThreeInternalGrade



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

us-gaap:ConsumerPortfolioSegment, ntrs:ForeignConsumerLoans, ntrs:SixToNineInternalGrade



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

us-gaap:ConsumerPortfolioSegment, ntrs:OtherConsumerLoan, ntrs:FourToFiveInternalGrade



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

us-gaap:ConsumerPortfolioSegment, ntrs:OtherConsumerLoan, ntrs:OneToThreeInternalGrade



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

us-gaap:ConsumerPortfolioSegment, ntrs:OtherConsumerLoan, ntrs:SixToNineInternalGrade



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

us-gaap:ConsumerPortfolioSegment, ntrs:PrivateClient, ntrs:FourToFiveInternalGrade



Period End2020-03-31
Value243
Percentage of FinancingReceivableRevolvingConvertedToTermLoan65.5

us-gaap:ConsumerPortfolioSegment, ntrs:PrivateClient, ntrs:OneToThreeInternalGrade



Period End2020-03-31
Value20
Percentage of FinancingReceivableRevolvingConvertedToTermLoan5.6

us-gaap:ConsumerPortfolioSegment, ntrs:PrivateClient, ntrs:SixToNineInternalGrade



Period End2020-03-31
Value10
Percentage of FinancingReceivableRevolvingConvertedToTermLoan2.8

us-gaap:ConsumerPortfolioSegment, us-gaap:ResidentialRealEstate, ntrs:FourToFiveInternalGrade



Period End2020-03-31
Value4
Percentage of FinancingReceivableRevolvingConvertedToTermLoan1.1

us-gaap:ConsumerPortfolioSegment, us-gaap:ResidentialRealEstate, ntrs:OneToThreeInternalGrade



Period End2020-03-31
Value1
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.4

us-gaap:ConsumerPortfolioSegment, us-gaap:ResidentialRealEstate, ntrs:SixToNineInternalGrade



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

ntrs:HedgedAssetLiabilityFairValueHedgeCumulativeIncreaseDecreaseNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value345130167135115128
Percentage of HedgedAssetLiabilityFairValueHedgeCumulativeIncreaseDecreaseNet100.0100.0100.0100.0100.0100.0

us-gaap:BalanceSheetLocation

ntrs:InvestmentsInCommunityDevelopmentProjectsCarryingAmountAssets

us-gaap:OtherAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value746749650589589602541472405415333218
Percentage of InvestmentsInCommunityDevelopmentProjectsCarryingAmountAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BalanceSheetLocation

ntrs:InvestmentsInCommunityDevelopmentProjectsCarryingAmountLiabilities

us-gaap:OtherLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value36237633429130232129128622924116482
Percentage of InvestmentsInCommunityDevelopmentProjectsCarryingAmountLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:MeasurementInputType

ntrs:LoansMeasurementInput

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsNonrecurring, us-gaap:MeasurementInputDiscountRate



Period End2020-03-312019-12-31
Value0.1540.153
Percentage of LoansMeasurementInput100.0100.0

us-gaap:Range, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:MeasurementInputType

srt:Maximum, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsNonrecurring, us-gaap:MeasurementInputDiscountRate



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value0.20.30.30.30.30.30.25
Percentage of LoansMeasurementInput129.9196.10.00.00.00.00.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

ntrs:LoansReceivableHeldToMaturity

us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value3807631517309323104830481323393103632156318413237533077332103315133471332293434633715325963224532022317473060029522295682853328147277522745228220
Percentage of LoansReceivableHeldToMaturity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value3762631239306513078330417322873107932189317863221132950330993305633354329243398433478324323199731863315033045829499294932849228136277972753428165
Percentage of LoansReceivableHeldToMaturity98.899.199.199.199.899.8100.1100.199.899.599.699.799.799.699.198.999.399.599.299.599.299.599.999.799.9100.0100.2100.399.8

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value3807631517309323104830481323393103632156318413237533077332103315133471332293434633715325963224532022317473060029522295682853328147277522745228220
Percentage of LoansReceivableHeldToMaturity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:LoansReceivableOverdraftAdvances



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value38001100140014001200220010001400120090613001300920140012001600100071992914001700150014001900150013001500160016001500180019001900160019002100150014001000
Percentage of LoansReceivableOverdraftAdvances100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:OffBalanceSheetCreditLossLiabilityCollectivelyEvaluatedForImpairment



Period End2020-03-312019-12-31
Value3718
Percentage of OffBalanceSheetCreditLossLiabilityCollectivelyEvaluatedForImpairment100.0100.0

us-gaap:FinancingReceivablePortfolioSegment

us-gaap:CommercialPortfolioSegment



Period End2020-03-312019-12-31
Value3513
Percentage of OffBalanceSheetCreditLossLiabilityCollectivelyEvaluatedForImpairment95.777.2

us-gaap:ConsumerPortfolioSegment



Period End2020-03-312019-12-31
Value14
Percentage of OffBalanceSheetCreditLossLiabilityCollectivelyEvaluatedForImpairment4.322.8

ntrs:OffBalanceSheetCreditLossLiabilityIndividuallyEvaluatedForImpairment



Period End2020-03-312019-12-31
Value31
Percentage of OffBalanceSheetCreditLossLiabilityIndividuallyEvaluatedForImpairment100.0100.0

us-gaap:FinancingReceivablePortfolioSegment

us-gaap:CommercialPortfolioSegment



Period End2020-03-312019-12-31
Value31
Percentage of OffBalanceSheetCreditLossLiabilityIndividuallyEvaluatedForImpairment100.0100.0

ntrs:OtherAssetsExcludingDerivativesAndNonFinancialInstruments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value760074006600660053004600480047004500390038003400330033003200330033343212320031133177361432303308360730293549283931772964
Percentage of OtherAssetsExcludingDerivativesAndNonFinancialInstruments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:OtherFinancialAssetsAccruedInterestAfterAllowanceForCreditLoss



Period End2020-03-312019-12-31
Value714
Percentage of OtherFinancialAssetsAccruedInterestAfterAllowanceForCreditLoss100.0100.0

ntrs:OtherFinancialAssetsAllowanceForCreditLoss



Period End2020-03-312019-12-31
Value10
Percentage of OtherFinancialAssetsAllowanceForCreditLoss100.00.0

ntrs:OtherLiabilitiesExcludingDerivativesAndNonFinancialInstruments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value380031003300270031002500270024002200240021001800220027002800220020082131250025193185279425912893260823382235320120591961
Percentage of OtherLiabilitiesExcludingDerivativesAndNonFinancialInstruments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:OverdrawnDemandDepositAccounts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value2690888815284731521271544874883147587516346779210983117104546923422446885519176
Percentage of OverdrawnDemandDepositAccounts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

ntrs:PercentageofTotalEquityCreditLines

us-gaap:ConsumerPortfolioSegment, us-gaap:HomeEquityLoan



Period End2020-03-312019-12-31
Value0.960.97
Percentage of PercentageofTotalEquityCreditLines100.0100.0

ntrs:SecuritiesContinuousUnrealizedLossPositionAggregateLosses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value24018915417026835743038336424915915315217674739414074624987828111118011513125303144668574639799159
Percentage of SecuritiesContinuousUnrealizedLossPositionAggregateLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value104614222730292316192325121117
Percentage of SecuritiesContinuousUnrealizedLossPositionAggregateLosses4.53.03.75.46.46.47.88.19.310.413.015.114.317.415.018.9

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

ntrs:StandbyLettersOfCredit

us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value2725273056282426293034363637394445463843586057615759556160
Percentage of StandbyLettersOfCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value2725273056282426293034363637394445463843586057615759556160
Percentage of StandbyLettersOfCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value2725273056282426293034363637394445463843586057615759556160
Percentage of StandbyLettersOfCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:TrustPreferredSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value277277277277277277277277277277277277277277277277277277277277277277277277277277277277277277277277277276276276276276276
Percentage of TrustPreferredSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value255262261257256253260260260260259260252251239241223236238244241242242230
Percentage of TrustPreferredSecurities92.094.494.192.692.491.393.893.793.993.793.494.091.190.586.287.080.685.386.088.287.187.687.683.1

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value2772772772772772772772772770277277277277277277277277277277277277277277
Percentage of TrustPreferredSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value255262261257256253260260260260259260252251239241223236238244241242242230
Percentage of TrustPreferredSecurities92.094.494.192.692.491.393.893.793.993.793.494.091.190.586.287.080.685.386.088.287.187.687.683.1

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-312011-03-312010-12-312009-12-31
Value93810131009101310031068105510501020104710371027101010351038104010221072105810441024105010551035932920888
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BalanceSheetLocation

us-gaap:AlternativeInvestment

us-gaap:OtherAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value1001121082525293610
Percentage of AlternativeInvestment100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:AssetsFairValueDisclosure

us-gaap:Loans, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsNonrecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value128102722247139121219286661010102023
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:MeasurementInputType

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsNonrecurring, us-gaap:Loans, us-gaap:MeasurementInputDiscountRate



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value1281027222412
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsNeededForImmediateSettlementAggregateFairValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value13439591567768187
Percentage of AssetsNeededForImmediateSettlementAggregateFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value65726232926915098617166
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

ntrs:CoveredBonds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value445521001
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax0.61.71.51.91.71.41.31.31.5

ntrs:OtherAssetBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value211131131001
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax0.44.34.24.32.21.71.51.02.3

ntrs:SubSovereignSupranationalAndNonUsAgencyBonds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value583743402411664
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax8.914.213.215.016.112.19.78.66.0

us-gaap:CommercialMortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value31283828124000
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax4.710.911.510.78.34.10.00.00.0

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value38272923103222
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax5.910.69.08.86.83.34.43.63.3

us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value100000.00.00.0100000.00.00.00.00.00.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax0.00.00.00.00.00.00.00.00.0

us-gaap:USGovernmentAgenciesDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value3651011391136852293539
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax55.638.842.441.945.353.348.349.259.9

us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value54243222102000
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax8.39.49.98.57.12.00.00.10.0

us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value1022627231921212618
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax15.610.28.38.912.622.234.936.227.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value2401087488188251327294189
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

ntrs:CoveredBonds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value100024674
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax0.50.70.30.81.41.92.12.42.3

ntrs:OtherAssetBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value105545132215167
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax43.74.96.06.67.29.14.95.64.2

ntrs:SubSovereignSupranationalAndNonUsAgencyBonds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value010023553
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax0.21.01.20.81.21.41.52.02.0

us-gaap:CommercialMortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value1200024664
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax5.30.80.41.01.11.71.92.12.2

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value114461421272922
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax4.73.75.96.97.58.48.210.012.1

us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value000001121
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax0.00.00.00.20.30.40.50.71.0

us-gaap:USGovernmentAgenciesDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value106785563124150199167108
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax44.271.974.972.266.159.960.956.957.4

us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value3132013633
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax1.312.22.70.10.91.52.01.21.8

us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value056102739585632
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax0.04.78.611.314.315.817.919.117.0

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312014-12-312013-12-31
Value3902538722386653768637095370413639735407338642951428382
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

ntrs:CoveredBonds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value550766759858837832830838879
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis1.42.02.02.32.32.22.32.42.6

ntrs:OtherAssetBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value328433243199298325302678260118712297
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis8.48.68.37.96.87.27.15.36.8

ntrs:OtherSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value8910131415181922
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis0.00.00.00.00.00.00.00.10.1

ntrs:SubSovereignSupranationalAndNonUsAgencyBonds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value204720912062224622142087192020081819
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis5.25.45.36.06.05.65.35.75.4

us-gaap:CertificatesOfDeposit



Period End2020-03-312019-12-31
Value20472091
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis5.25.4

us-gaap:CommercialMortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value904769784783647587449433439
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis2.32.02.02.11.71.61.21.21.3

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value240823782560240422972312229524933013
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis6.26.16.66.46.26.26.37.08.9

us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value333143143143143143179
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis0.00.00.00.40.40.40.40.40.5

us-gaap:USGovernmentAgenciesDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value236112324722536224562262422522217532118618745
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis60.560.058.359.661.060.859.859.855.4

us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value172516041117730755657718741749
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis4.44.12.91.92.01.82.02.12.2

us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value448145275631506550305203566256685714
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis11.511.714.613.413.614.015.616.016.9

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value879989778399718857746545575940363394254517241326
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

ntrs:OtherAssetBackedSecurities



Period End2020-03-312019-12-31
Value464452
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost5.35.0

us-gaap:CommercialMortgageBackedSecurities



Period End2020-03-312019-12-31
Value600555
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost6.86.2

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-31
Value555
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost0.10.6

us-gaap:USGovernmentAgenciesDebtSecurities



Period End2020-03-312019-12-31
Value55245870
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost62.865.4

us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-31
Value16011441
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost18.216.1

us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-31
Value552552
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost6.36.2

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value891490058480723457406535575340233418249417381333
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

ntrs:OtherAssetBackedSecurities



Period End2020-03-312019-12-31
Value432451
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue4.95.0

us-gaap:CommercialMortgageBackedSecurities



Period End2020-03-312019-12-31
Value617577
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue6.96.4

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-31
Value555
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue0.10.6

us-gaap:USGovernmentAgenciesDebtSecurities



Period End2020-03-312019-12-31
Value55655869
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue62.465.2

us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-31
Value16491449
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue18.516.1

us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-31
Value594552
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue6.76.1

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value184781819519139196742101220017210941780817132150111866318464
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

ntrs:CoveredBonds



Period End2020-03-312019-12-31
Value442485
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost2.42.7

ntrs:OtherAssetBackedSecurities



Period End2020-03-312019-12-31
Value21641977
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost11.710.9

us-gaap:CertificatesOfDeposit



Period End2020-03-312019-12-31
Value16691707
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost9.09.4

us-gaap:CommercialMortgageBackedSecurities



Period End2020-03-312019-12-31
Value255167
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost1.40.9

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-31
Value20361981
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost11.010.9

us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-312019-12-31
Value03
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost0.00.0

us-gaap:USGovernmentAgenciesDebtSecurities



Period End2020-03-312019-12-31
Value100979714
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost54.653.4

us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-31
Value8783
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost0.50.5

us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-31
Value17242075
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost9.311.4

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value186761831119284197992094319937210581777717157150671884018555
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

ntrs:CoveredBonds



Period End2020-03-312019-12-31
Value444488
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue2.42.7

ntrs:OtherAssetBackedSecurities



Period End2020-03-312019-12-31
Value20961984
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue11.210.8

us-gaap:CertificatesOfDeposit



Period End2020-03-312019-12-31
Value17271743
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue9.39.5

us-gaap:CommercialMortgageBackedSecurities



Period End2020-03-312019-12-31
Value258174
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue1.41.0

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-31
Value20642005
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue11.111.0

us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-312019-12-31
Value03
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue0.00.0

us-gaap:USGovernmentAgenciesDebtSecurities



Period End2020-03-312019-12-31
Value102259728
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue54.853.1

us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-31
Value9185
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue0.50.5

us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-31
Value17682098
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue9.511.5

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value219926781981149910481052897118715191272603832
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

ntrs:OtherAssetBackedSecurities



Period End2020-03-312019-12-31
Value139
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost0.60.3

us-gaap:CommercialMortgageBackedSecurities



Period End2020-03-312019-12-31
Value210
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost1.00.0

us-gaap:USGovernmentAgenciesDebtSecurities



Period End2020-03-312019-12-31
Value21642669
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost98.499.7

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value221626771993150710411042890118514951265613834
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

ntrs:OtherAssetBackedSecurities



Period End2020-03-312019-12-31
Value129
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue0.50.3

us-gaap:CommercialMortgageBackedSecurities



Period End2020-03-312019-12-31
Value210
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue1.00.0

us-gaap:USGovernmentAgenciesDebtSecurities



Period End2020-03-312019-12-31
Value21832668
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue98.599.7

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value954888709144932492066249788093357467955274319468
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

ntrs:CoveredBonds



Period End2020-03-312019-12-31
Value108281
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost1.13.2

ntrs:OtherAssetBackedSecurities



Period End2020-03-312019-12-31
Value643885
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost6.710.0

ntrs:OtherSecurities



Period End2020-03-312019-12-31
Value89
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost0.10.1

us-gaap:CertificatesOfDeposit



Period End2020-03-312019-12-31
Value327333
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost3.43.8

us-gaap:CommercialMortgageBackedSecurities



Period End2020-03-312019-12-31
Value2646
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost0.30.5

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-31
Value366341
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost3.83.9

us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-312019-12-31
Value30
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost0.00.0

us-gaap:USGovernmentAgenciesDebtSecurities



Period End2020-03-312019-12-31
Value58254994
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost61.056.3

us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-31
Value3580
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost0.40.9

us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-31
Value22041899
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost23.121.4

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value963488829161932591626227787693327487956574519469
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

ntrs:CoveredBonds



Period End2020-03-312019-12-31
Value108281
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue1.13.2

ntrs:OtherAssetBackedSecurities



Period End2020-03-312019-12-31
Value641885
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue6.710.0

ntrs:OtherSecurities



Period End2020-03-312019-12-31
Value89
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue0.10.1

us-gaap:CertificatesOfDeposit



Period End2020-03-312019-12-31
Value327334
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue3.43.8

us-gaap:CommercialMortgageBackedSecurities



Period End2020-03-312019-12-31
Value2546
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue0.30.5

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-31
Value365341
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue3.83.8

us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-312019-12-31
Value30
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue0.00.0

us-gaap:USGovernmentAgenciesDebtSecurities



Period End2020-03-312019-12-31
Value58955005
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue61.256.3

us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-31
Value3580
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue0.40.9

us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-31
Value22211898
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue23.121.4

us-gaap:AvailableForSaleSecuritiesDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-03-312010-12-312009-12-31
Value394413887638920378673705836888361313518433742355793231729558283922864330192777978
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel2



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value3490034300333003280032000317003050028000
Percentage of AvailableForSaleSecuritiesDebtSecurities88.588.285.686.686.485.984.483.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:FairValueInputsLevel1, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value458445495653507950225185562456385700
Percentage of AvailableForSaleSecuritiesDebtSecurities11.611.714.513.413.614.115.616.016.9

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value348573432733267327883203631703305032954328037
Percentage of AvailableForSaleSecuritiesDebtSecurities88.488.385.586.686.485.984.484.083.1

us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value000000224
Percentage of AvailableForSaleSecuritiesDebtSecurities0.00.00.00.00.00.00.00.00.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value458445495653507950225185562456385700
Percentage of AvailableForSaleSecuritiesDebtSecurities11.611.714.513.413.614.115.616.016.9

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value348573432733267327883203631703305032954328037
Percentage of AvailableForSaleSecuritiesDebtSecurities88.488.385.586.686.485.984.484.083.1

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value000000224
Percentage of AvailableForSaleSecuritiesDebtSecurities0.00.00.00.00.00.00.00.00.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value458445495653507950225185562456385700
Percentage of AvailableForSaleSecuritiesDebtSecurities11.611.714.513.413.614.115.616.016.9

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, ntrs:CoveredBonds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value553769764863837829824831875
Percentage of AvailableForSaleSecuritiesDebtSecurities1.42.02.02.32.32.22.32.42.6

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, ntrs:OtherAssetBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value318233303209298925202657258618552291
Percentage of AvailableForSaleSecuritiesDebtSecurities8.18.68.27.96.87.27.25.36.8

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, ntrs:OtherSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value8910131415181922
Percentage of AvailableForSaleSecuritiesDebtSecurities0.00.00.00.00.00.00.10.10.1

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, ntrs:SubSovereignSupranationalAndNonUsAgencyBonds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value210521272104228622362096192120091820
Percentage of AvailableForSaleSecuritiesDebtSecurities5.35.55.46.06.05.75.35.75.4

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:CommercialMortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value922797822811658587443427435
Percentage of AvailableForSaleSecuritiesDebtSecurities2.32.12.12.11.81.61.21.21.3

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value243624022585242122932294227124662993
Percentage of AvailableForSaleSecuritiesDebtSecurities6.26.26.66.46.26.26.37.08.9

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value333143142142141141177
Percentage of AvailableForSaleSecuritiesDebtSecurities0.00.00.00.40.40.40.40.40.5

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:USGovernmentAgenciesDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value238702327122620225052256822424215832105418676
Percentage of AvailableForSaleSecuritiesDebtSecurities60.559.958.159.460.960.859.759.855.4

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value177616151147753764655712737746
Percentage of AvailableForSaleSecuritiesDebtSecurities4.54.22.92.02.11.82.02.12.2

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value394413887638920378673705836888361313518433742
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value394413887638920378673705836888361313518433742
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value394413887638920378673705836888361313518433742
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementsRecurring, ntrs:CoveredBonds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value553769764863837829824831875
Percentage of AvailableForSaleSecuritiesDebtSecurities1.42.02.02.32.32.22.32.42.6

us-gaap:FairValueMeasurementsRecurring, ntrs:OtherAssetBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value318233303209298925202657258618552291
Percentage of AvailableForSaleSecuritiesDebtSecurities8.18.68.27.96.87.27.25.36.8

us-gaap:FairValueMeasurementsRecurring, ntrs:OtherSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value8910131415181922
Percentage of AvailableForSaleSecuritiesDebtSecurities0.00.00.00.00.00.00.10.10.1

us-gaap:FairValueMeasurementsRecurring, ntrs:SubSovereignSupranationalAndNonUsAgencyBonds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value210521272104228622362096192120091820
Percentage of AvailableForSaleSecuritiesDebtSecurities5.35.55.46.06.05.75.35.75.4

us-gaap:FairValueMeasurementsRecurring, us-gaap:CommercialMortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value922797822811658587443427435
Percentage of AvailableForSaleSecuritiesDebtSecurities2.32.12.12.11.81.61.21.21.3

us-gaap:FairValueMeasurementsRecurring, us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value243624022585242122932294227124662993
Percentage of AvailableForSaleSecuritiesDebtSecurities6.26.26.66.46.26.26.37.08.9

us-gaap:FairValueMeasurementsRecurring, us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value333143142142141141177
Percentage of AvailableForSaleSecuritiesDebtSecurities0.00.00.00.40.40.40.40.40.5

us-gaap:FairValueMeasurementsRecurring, us-gaap:USGovernmentAgenciesDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value238702327122620225052256822424215832105418676
Percentage of AvailableForSaleSecuritiesDebtSecurities60.559.958.159.460.960.859.759.855.4

us-gaap:FairValueMeasurementsRecurring, us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value177616151147753764655712737746
Percentage of AvailableForSaleSecuritiesDebtSecurities4.54.22.92.02.11.82.02.12.2

us-gaap:FairValueMeasurementsRecurring, us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value458445495653507950225185562456385700
Percentage of AvailableForSaleSecuritiesDebtSecurities11.611.714.513.413.614.115.616.016.9

us-gaap:FinancialInstrument

ntrs:CoveredBonds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value553769764863837829824831875
Percentage of AvailableForSaleSecuritiesDebtSecurities1.42.02.02.32.32.22.32.42.6

ntrs:OtherAssetBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value318233303209298925202657258618552291
Percentage of AvailableForSaleSecuritiesDebtSecurities8.18.68.27.96.87.27.25.36.8

ntrs:OtherSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value8910131415181922
Percentage of AvailableForSaleSecuritiesDebtSecurities0.00.00.00.00.00.00.10.10.1

ntrs:SubSovereignSupranationalAndNonUsAgencyBonds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value210521272104228622362096192120091820
Percentage of AvailableForSaleSecuritiesDebtSecurities5.35.55.46.06.05.75.35.75.4

us-gaap:CertificatesOfDeposit



Period End2020-03-312019-12-31
Value21052127
Percentage of AvailableForSaleSecuritiesDebtSecurities5.35.5

us-gaap:CommercialMortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value922797822811658587443427435
Percentage of AvailableForSaleSecuritiesDebtSecurities2.32.12.12.11.81.61.21.21.3

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value243624022585242122932294227124662993
Percentage of AvailableForSaleSecuritiesDebtSecurities6.26.26.66.46.26.26.37.08.9

us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value333143142142141141177
Percentage of AvailableForSaleSecuritiesDebtSecurities0.00.00.00.40.40.40.40.40.5

us-gaap:USGovernmentAgenciesDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value238702327122620225052256822424215832105418676
Percentage of AvailableForSaleSecuritiesDebtSecurities60.559.958.159.460.960.859.759.855.4

us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value177616151147753764655712737746
Percentage of AvailableForSaleSecuritiesDebtSecurities4.54.22.92.02.11.82.02.12.2

us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value458445495653507950225185562456385700
Percentage of AvailableForSaleSecuritiesDebtSecurities11.611.714.513.413.614.115.616.016.9

us-gaap:CashAndDueFromBanks



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value58334459503753485074458150734888608145185262569446495332489253127005644444857152407430502918394536763162269046303773375233963594428043154336509935922818348935242651249126483921
Percentage of CashAndDueFromBanks100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:FairValueInputsLevel1, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value58334459503753485074458150734888608145185262569446495332489253127005644444857152407430502918394536763162269046303752
Percentage of CashAndDueFromBanks100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value58334459503753485074458150734888608145185262569446495332489253127005644444857152407430502918394536763162269046303752
Percentage of CashAndDueFromBanks100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value58334459503753485074458150734888608145185262569446495332489253127005644444857152407430502918394536763162269046303752
Percentage of CashAndDueFromBanks100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CollateralAlreadyPostedAggregateFairValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value92232730314712431623049819735190220159317665836110016334822201272415543161973941015015565537338100400160026002900168
Percentage of CollateralAlreadyPostedAggregateFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:CommitmentsFairValueDisclosure

us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value493233323313914632323329343741454546482425262828293335383938
Percentage of CommitmentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value493233323313914632323329343741454546482425262828293335383938
Percentage of CommitmentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value493233323313914632323329343741454546482425262828293335383938
Percentage of CommitmentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerAssetNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value920903930922909832831800771708
Percentage of ContractWithCustomerAssetNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

ntrs:OtherCustomerReceivables



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value1011019691919086807179
Percentage of ContractWithCustomerAssetNet11.011.210.410.010.010.810.410.09.211.1

ntrs:TrustFeesReceivableNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value819801833831818742744720700629
Percentage of ContractWithCustomerAssetNet89.088.889.690.090.089.289.690.090.888.9

us-gaap:CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption



Period End2020-01-012018-01-01
Value-10-4
Percentage of CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value84091075414838167061726215563134324580
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

ntrs:CoveredBonds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value00308741102269645789
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger0.00.02.14.45.94.53.41.9

ntrs:OtherAssetBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value10491164129996089395460629
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger12.510.88.85.75.26.14.50.7

ntrs:SubSovereignSupranationalAndNonUsAgencyBonds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value1581558401343150111891244235
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger1.91.45.78.08.77.69.35.1

us-gaap:CommercialMortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value345981154193274326201
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger0.40.60.60.91.11.82.44.4

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value13449266379310091097989922
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger1.64.64.54.85.87.17.420.1

us-gaap:USGovernmentAgenciesDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value70337818795785598371682259962998
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger83.672.753.651.248.543.844.665.5

us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value00459820927924152
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger0.00.00.30.61.21.81.81.1

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value1449810312120527328562
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

ntrs:CoveredBonds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value001271090
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss0.00.01.22.13.53.83.31.4

ntrs:OtherAssetBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value6032261190
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss41.63.62.71.63.04.03.20.2

ntrs:SubSovereignSupranationalAndNonUsAgencyBonds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value0003611130
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss0.30.10.92.83.04.14.80.6

us-gaap:CommercialMortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value00001451
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss0.10.20.20.70.91.51.92.4

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value133613182314
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss1.33.13.65.06.66.98.322.4

us-gaap:USGovernmentAgenciesDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value814241489211713427
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss56.743.240.340.245.242.847.343.7

us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value00000110
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss0.00.00.10.10.20.50.60.5

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value6022133626371797411611186482076622981
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

ntrs:CoveredBonds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value306646206191816461193967
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months5.14.83.20.21.63.55.74.2

ntrs:OtherAssetBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value161670681511071436250717872453
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months26.85.312.813.912.413.48.610.7

ntrs:SubSovereignSupranationalAndNonUsAgencyBonds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value991302338168253110516171692
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months1.79.75.32.12.25.97.87.4

us-gaap:CommercialMortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value29662360182278233
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months4.90.50.60.00.20.10.41.0

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value669410397983397127161547
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months11.13.16.21.22.93.83.56.7

us-gaap:USGovernmentAgenciesDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value28035405391449306933836893056495
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months46.540.461.461.859.744.944.828.3

us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value230902217066169471687
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months3.86.83.40.00.60.92.33.0

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value959151486383145186
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

ntrs:CoveredBonds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value13000397
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss1.43.50.20.20.54.46.23.9

ntrs:OtherAssetBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value4522481588
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss47.12.35.59.113.719.05.64.4

ntrs:SubSovereignSupranationalAndNonUsAgencyBonds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value030004117
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss0.13.41.80.80.95.57.64.0

us-gaap:CommercialMortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value120000012
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss13.30.80.20.00.20.10.71.4

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value81000449
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss9.21.41.80.41.44.92.85.0

us-gaap:USGovernmentAgenciesDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value2435141431336481
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss25.539.027.330.550.239.944.643.5

us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value313101253
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss3.414.63.70.01.92.93.41.8

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value1443124117212092468028873342123419827562
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

ntrs:CoveredBonds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value3066465147611203134316511056
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition2.12.72.43.14.23.94.83.8

ntrs:OtherAssetBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value26661871211420682330346223932483
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition18.57.810.08.48.110.17.09.0

ntrs:SubSovereignSupranationalAndNonUsAgencyBonds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value2581457117915121755229428621928
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition1.86.05.66.16.16.78.47.0

us-gaap:CommercialMortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value330122118154212297404435
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition2.30.50.60.60.70.91.21.6

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value80390310608911348181017062469
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition5.63.75.03.64.75.35.09.0

us-gaap:USGovernmentAgenciesDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value98361322311871134901530515191153019494
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition68.254.856.054.753.044.444.734.4

us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value23090226298276449712739
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition1.63.71.20.41.01.32.12.7

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value240189154170268357430249
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

ntrs:CoveredBonds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value1312714188
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss0.51.70.81.62.83.94.33.2

ntrs:OtherAssetBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value1055561426178
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss43.83.03.63.85.57.54.03.4

ntrs:SubSovereignSupranationalAndNonUsAgencyBonds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value0313615247
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss0.21.71.22.22.54.45.73.2

us-gaap:CommercialMortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value120002464
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss5.30.50.20.50.71.21.51.6

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value1044614222723
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss4.52.33.03.75.46.46.49.3

us-gaap:USGovernmentAgenciesDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value106785563124150199108
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss44.341.236.037.446.342.146.443.5

us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value313201363
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss1.37.01.30.10.61.01.51.4

us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLoss



Period End2020-03-312019-12-31
Value90
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLoss100.00.0

us-gaap:FinancialInstrument

ntrs:CoveredBonds



Period End2020-03-312019-12-31
Value100000.00.0
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLoss1.10.0

ntrs:NonUSTreasuryandGovernment



Period End2020-03-312019-12-31
Value400000.00.0
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLoss4.20.0

ntrs:SubSovereignSupranationalAndNonUsAgencyBonds



Period End2020-03-312019-12-31
Value10
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLoss13.70.0

us-gaap:CertificatesOfDeposit



Period End2020-03-312019-12-31
Value200000.00.0
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLoss2.10.0

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-31
Value20
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLoss28.40.0

us-gaap:OtherDebtSecurities



Period End2020-03-312019-12-31
Value40
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLoss50.50.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:DebtSecuritiesTradingAndAvailableForSale

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value45844549565350795022518556245700
Percentage of DebtSecuritiesTradingAndAvailableForSale100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value3485834327332683278832036317033050428038
Percentage of DebtSecuritiesTradingAndAvailableForSale760.4754.6588.5645.5637.9611.4542.3491.9

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value00000024
Percentage of DebtSecuritiesTradingAndAvailableForSale0.00.00.00.00.00.00.10.1

us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value3944238876389213786837058368893613233742
Percentage of DebtSecuritiesTradingAndAvailableForSale860.4854.6688.5745.5737.9711.4642.4591.9

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:DeferredCompensationPlanAssets

us-gaap:FairValueInputsLevel1, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value1471311381351311251291311321151181181181071181161171041061091139697969379828986
Percentage of DeferredCompensationPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value7176737366697271726662616455555351494851515050515147434439
Percentage of DeferredCompensationPlanAssets48.858.553.154.350.655.655.854.154.657.153.152.254.151.647.046.244.047.245.347.145.351.751.353.055.160.053.349.745.4

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value204199198203200202206207210183180181185166167166165155155161162143145148149132131135121
Percentage of DeferredCompensationPlanAssets139.2152.3143.5150.6152.9161.8158.9157.1159.4158.8152.8153.4156.6155.0141.6143.7140.5149.0146.4147.3142.3148.1149.1153.6159.0167.3159.2152.1139.9

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value218207212208197194202203204181180179182162174169169153154161165146147147145126126133126
Percentage of DeferredCompensationPlanAssets148.8158.5153.1154.3150.6155.6155.8154.1154.6157.1153.1152.2154.1151.6147.0146.2144.0147.2145.3147.1145.3151.7151.3153.0155.1160.0153.3149.7145.4

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:DemandDepositAccounts

us-gaap:FairValueInputsLevel1, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value6079347733406744030536648373403976242158441684556642342442994642546671439394713645495451914465546237390164145439267374373666833762312043383539221
Percentage of DemandDepositAccounts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0