PFG


Line plots across dimensions of each concept
Tables

Table of contents



us-gaap:CommonStockValue
us-gaap:StatementEquityComponents
us-gaap:SharesOutstanding

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:Revenues
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:PremiumsEarnedNet
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments

us-gaap:NetInvestmentIncome
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome
us-gaap:InvestmentType
us-gaap:RealizedInvestmentGainsLosses

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:IncomeTaxExpenseBenefit
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:NetIncomeLoss
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:Assets
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor
us-gaap:StatementBusinessSegments

us-gaap:Liabilities
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:LiabilitiesAndStockholdersEquity
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:StockholdersEquity
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor
us-gaap:StatementEquityComponents

us-gaap:CashAndCashEquivalentsAtCarryingValue
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:PropertyPlantAndEquipmentNet
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:Goodwill
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:IntangibleAssetsNetExcludingGoodwill
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:LongTermDebt
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:MinorityInterest
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:StockholdersEquity
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:RetainedEarningsAccumulatedDeficit
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:TreasuryStockValue
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:NetCashProvidedByUsedInOperatingActivities
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:NetCashProvidedByUsedInInvestingActivities
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:NetCashProvidedByUsedInFinancingActivities
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:NetCashProvidedByUsedInOperatingActivities
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:NetIncomeLoss
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:ProfitLoss
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:NetCashProvidedByUsedInInvestingActivities
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:NetCashProvidedByUsedInFinancingActivities
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor
us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:PaymentsForRepurchaseOfCommonStock
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:RepaymentsOfLongTermDebt
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

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

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:ProceedsFromRepaymentsOfShortTermDebt
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor
us-gaap:StatementEquityComponents
pfg:AdjustmentsForAssumedChangesInAmortizationPatternsBeforeTax
us-gaap:StatementEquityComponents
pfg:AdjustmentsForAssumedChangesInAmortizationPatternsNetOfTax
us-gaap:StatementEquityComponents
pfg:AdjustmentsForAssumedChangesInAmortizationPatternsTax
us-gaap:StatementEquityComponents
pfg:AdjustmentsForAssumedChangesInLiabilityForPolicyholderBenefitsAndClaimsBeforeTax
us-gaap:StatementEquityComponents
pfg:AdjustmentsForAssumedChangesInLiabilityForPolicyholderBenefitsAndClaimsNetOfTax
us-gaap:StatementEquityComponents
pfg:AdjustmentsForAssumedChangesInLiabilityForPolicyholderBenefitsAndClaimsTax

pfg:AdjustmentsToRedemptionAmountOfRedeemableNoncontrollingInterest
us-gaap:StatementEquityComponents

pfg:CapitalGainsLossesDistributed
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
pfg:CapitalReceivedFromDividendsPaidToParent
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

pfg:ContributionsToRedeemableNoncontrollingInterest
us-gaap:AdjustmentsForNewAccountingPronouncements
pfg:CumulativeEffectOfProspectiveApplicationOfNewAccountingPrincipleNetOfTax
us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:StatementEquityComponents

pfg:DeferredAcquisitionCostAndOtherActuarialBalancesAmortizationExpense

pfg:DerivativeAndHedgingRelatedAdjustments

pfg:DistributionsToRedeemableNoncontrollingInterest
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
pfg:DividendsReceivedFromContributionsToUnconsolidatedEntities
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

pfg:EffectiveIncomeTaxRateReconciliationLocalCountryPermanentTaxAdjustmentsPercent

pfg:EquityMethodInvestmentsRelatedAdjustments
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency
pfg:FairValueAssetsLevel2ToLevel3TransfersAmount
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentSecondaryCategorization
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency
pfg:FairValueAssetsLevel3ToLevel2TransfersAmount
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentSecondaryCategorization
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency
pfg:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsRelatingToPositionsStillHeld
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency
pfg:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncome
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentSecondaryCategorization
us-gaap:FairValueByLiabilityClass, us-gaap:FairValueByMeasurementFrequency
pfg:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisIssuesNet
us-gaap:FairValueByLiabilityClass, us-gaap:FairValueByMeasurementFrequency
pfg:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitiesGainLossIncludedInEarningsRelatingToPositionsStillHeld
us-gaap:FairValueByMeasurementFrequency
pfg:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetDerivativeAssetsGainLossIncludedInEarningsRelatingToPositionsStillHeld
us-gaap:ConsolidationItems
pfg:FeesAndOtherRevenuesNotWithinScopeOfRevenueRecognitionGuidance
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments

pfg:FrontEndFeeRevenuesRecognition

pfg:IncomeLossFromContinuingOperationsBeforeIncomeTaxes
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor
us-gaap:StatementBusinessSegments
pfg:InterSegmentRevenue

pfg:InvestmentAdvisoryAssetManagementAndInsuranceFeesAndCommissions
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments

pfg:MarketValueAdjustmentsEmbeddedDerivatives

pfg:MinorityInterestIncreaseFromContributionsFromNoncontrollingInterest
us-gaap:StatementEquityComponents

pfg:NetGainLossExcludingAvailableForSaleImpairments
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

pfg:OperatingExpensesIncludingDeferredAcquisitionCostsCapitalizationAndAmortization
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor
us-gaap:ConsolidationItems
pfg:OperatingRevenues
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments

pfg:OtherComprehensiveIncomeAvailableForSaleSecuritiesPeriodIncreaseDecreaseNetOfTax

pfg:OtherComprehensiveIncomeDerivativesPeriodIncreaseDecreaseNetOfTax

pfg:OtherComprehensiveIncomeLossAttributableToRedeemableNoncontrollingInterest

pfg:OtherComprehensiveIncomeLossNetOfTaxExcludingRedeemableNoncontrollingInterest
us-gaap:StatementEquityComponents

pfg:PaymentsToAcquirePropertyPlantAndEquipmentNet
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:IncomeStatementLocation
pfg:PeriodicSettlementOnDerivatives
us-gaap:ConsolidationItems
pfg:PreTaxOtherAdjustmentsInReconcilingSegmentRevenuesToConsolidatedIncome
us-gaap:ConsolidationItems
pfg:PretaxOperatingEarnings
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

pfg:ProceedsFromMaturitiesRepaymentsAndCallsOfDebtSecuritiesAvailableForSaleAndEquitySecuritiesFvNi
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

pfg:ProceedsFromSaleOfDebtSecuritiesAvailableForSaleAndEquitySecuritiesFvNi
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor
us-gaap:ConsolidationItems
pfg:SegmentReportingInformationEarningsAdjustmentsRelatedToEquityMethodInvestmentsAndNoncontrollingInterest

pfg:SegmentReportingInformationNetRealizedCapitalGainsLosses
us-gaap:ConsolidationItems

pfg:SegmentReportingInformationPretaxNetRealizedCapitalGainsLossesNetOfAdjustments
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems
pfg:SegmentReportingInformationRevenueAdjustmentsRelatedToEquityMethodInvestments
us-gaap:PlanName
pfg:ShareBasedCompensationArrangementShareBasedPaymentAwardAmountCapitalized

pfg:SponsoredInvestmentFundsRelatedAdjustments

pfg:StockBasedCompensation
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
pfg:TreasuryStockAcquiredRepurchaseAuthorizationAmount

pfg:UnrealizedGainsLossesOnEquitySecuritiesFvNiReportedInNetInvestmentIncome

us-gaap:AdditionsToContractHoldersFunds
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:BenefitsLossesAndExpenses
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:CapitalizedContractCostAmortization

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:IncomeStatementLocation
us-gaap:ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:IncomeStatementLocation
us-gaap:ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1
us-gaap:StatementEquityComponents
us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor
us-gaap:Restatement, us-gaap:AdjustmentsForNewAccountingPronouncements
us-gaap:CumulativeEffectOnRetainedEarningsNetOfTax1

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleRealizedGain

us-gaap:DebtSecuritiesAvailableForSaleRealizedLossExcludingOtherThanTemporaryImpairment

us-gaap:DebtSecuritiesTradingRealizedGainLoss

us-gaap:DebtSecuritiesTradingUnrealizedGainLoss
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanInterestCost
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanServiceCost
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:IncomeStatementLocation
us-gaap:DerivativeFairValueHedgeIncludedInEffectivenessGainLoss

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
us-gaap:DerivativeInstrumentRisk

us-gaap:DividendsCommonStock
us-gaap:StatementEquityComponents

us-gaap:EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate

us-gaap:EffectiveIncomeTaxRateReconciliationDeductionsDividends

us-gaap:EffectiveIncomeTaxRateReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary

us-gaap:EffectiveIncomeTaxRateReconciliationTaxCredits

us-gaap:EffectiveIncomeTaxRateReconciliationTaxExemptIncome
us-gaap:PlanName
us-gaap:EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense

us-gaap:EquitySecuritiesFvNiGainLoss

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentSecondaryCategorization
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentSecondaryCategorization
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentSecondaryCategorization
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentSecondaryCategorization
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentSecondaryCategorization
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentSecondaryCategorization
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentSecondaryCategorization
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentSecondaryCategorization
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
us-gaap:FairValueByLiabilityClass, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
us-gaap:FairValueByLiabilityClass, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome
us-gaap:FairValueByLiabilityClass, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements
us-gaap:FairValueByLiabilityClass, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings
us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchasesSalesIssuesSettlements
us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSales
us-gaap:FinancialInstrument
us-gaap:FairValueOptionChangesInFairValueGainLoss1

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery
us-gaap:FinancingReceivablePortfolioSegment

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:MortgageLoansOnRealEstateLoanType
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivableSignificantPurchases
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivableSignificantSales
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:GainLossOnDerivativeInstrumentsNetPretax
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:IncomeStatementLocation
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:IncomeStatementLocation

us-gaap:GainLossOnInvestments
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:IncomeLossFromEquityMethodInvestments
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:IncreaseDecreaseInDeposits
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor
us-gaap:AwardType
us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1

us-gaap:MinorityInterestChangeInRedemptionValue

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
us-gaap:StatementEquityComponents

us-gaap:MinorityInterestDecreaseFromRedemptions
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us-gaap:FairValueByMeasurementBasis

us-gaap:LoansPledgedAsCollateral

us-gaap:MortgageLoansOnRealEstateCommercialAndConsumerNet
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:NotesReceivableGross

us-gaap:OtherAssets
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:OtherInvestments
us-gaap:ConsolidatedEntities

us-gaap:OtherLiabilities
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:OtherPolicyholderFunds
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:PremiumsAndOtherReceivablesNet
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:RealEstateInvestments
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:RedeemableNoncontrollingInterestEquityCarryingAmount
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments

us-gaap:SeparateAccountAssets
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency

us-gaap:SeparateAccountsLiability
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:ShortTermBorrowings
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor
us-gaap:StatementEquityComponents

us-gaap:TradingSecuritiesDebt
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor
us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency

us-gaap:TreasuryStockShares
us-gaap:InvestmentSecondaryCategorization, us-gaap:InvestmentType
us-gaap:VariableInterestEntityEntityMaximumLossExposureAmount
us-gaap:InvestmentType
us-gaap:InvestmentSecondaryCategorization, us-gaap:InvestmentType
us-gaap:VariableInterestEntityNonconsolidatedCarryingAmountAssets
us-gaap:InvestmentType

Tables

  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:CommonStockValue ▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄44444444444444444444444444444444444444NANANA4NANANA
 us-gaap:SharesOutstanding us-gaap:StatementEquityComponents us-gaap:CommonStock▁▁▂▂▂▂▂▃▃▃▃▃▃▃▃▃▃▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▅▅▆▇████273276278278278279283284287289288288288287287288290291293294294293293293294295293293293293293295300301305313321320320319NA319NANANA
us-gaap:CommonStockSharesIssued █████▇▇▇▇▇▆▆▆▆▅▅▅▅▅▅▄▄▄▄▄▃▃▃▃▂▂▂▂▁▁▁▁▁480479479478478476476476476474473472471469468468468466466465464462462461460459458456455453453452452450450449449448NANANA447NANANA
us-gaap:CommonStockSharesOutstanding ▁▁▂▂▂▂▂▃▃▃▃▃▃▃▃▃▃▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▅▅▆▇██273276278278278279283284287289288288288287287288290291293294294293293293294295293293293293293295300301305313321320NANANA319NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding 277NA281281280NA287289292NA293292292NA291292294NA298298298NA298298299NA298297297NA297301304NA314323324NA323322322NANANANA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic 275NA279279278NA284286289NA289288288NA288289291NA295295294NA294294295NA294294294NA294299301NA311320321NA320320319NANANANA
us-gaap:EarningsPerShareBasic ▃▃▃▄▄▃▅▅▄██▃▄▃▃▃▄▃▃▃▄▃▂▃▃▃▃▂▂▂▂▂▂▂▁▃▂▂▂▂▂▂▂▂▂1.051.080.991.381.540.841.61.591.372.912.81.071.211.11.071.111.260.871.020.821.410.920.781.040.960.790.830.760.610.740.610.580.670.540.20.810.610.620.440.420.60.440.580.520.43
us-gaap:EarningsPerShareDiluted ▃▃▃▄▄▃▅▅▄██▃▄▃▃▃▄▃▃▃▄▃▂▃▃▃▃▂▂▂▂▂▂▂▁▃▂▂▂▂▂▂▂▂▂1.041.070.981.371.530.831.591.581.362.872.761.061.191.091.061.11.250.861.010.811.390.910.771.030.950.780.820.750.610.740.60.580.660.540.20.80.60.620.440.420.590.440.570.520.43
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:Revenues █▆█▆▆▆▇▄▃▄█▄▄▅▃▄▄▃▄▄▃▃▂▂▂▃▁▁▁▂▃▁▁▁▁▂▁▂▂▁▂▁▂▁▁455140474458397237433770434832342883323746273178304935132818302530362807324032592657290824842606247826722239221021662295270421182095205920882342221923722288223322642232227021572188
 us-gaap:Revenues us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalFinancialServicesAndOther928NANANA931NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceCompany4081NANANA3186NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate4442NANANA3730NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PremiumsEarnedNet 2291NA227419321724NA21721265995NA212614521248NA100212761282NA15571682916NA875835803NA7037376947001158681679NA672751797NA865868878NANANANA
 us-gaap:PremiumsEarnedNet us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceCompany2145NANANA1542NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PremiumsEarnedNet us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate2291NANANA1724NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PremiumsEarnedNet us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments,us-gaap:Subsegments us-gaap:OperatingSegments,pfg:SegmentRetirementAndIncomeSolutions,pfg:SubsegmentRetirementAndIncomeSolutionsSpread1521NA14991171957NA1495555288NA1495814623NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PremiumsEarnedNet us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments,us-gaap:Subsegments us-gaap:OperatingSegments,pfg:SegmentUSInsuranceSolutions,pfg:SubsegmentSpecialtyBenefitsInsurance588NA579571555NA539527517NA505490478NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetInvestmentIncome 983NA9961037961NA919889902NA838866877NA856799761NA753789723NA770829844NA784749789845783801824NA815873859NA880877863NANANANA
 us-gaap:NetInvestmentIncome us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalFinancialServicesAndOther622NANANA546NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetInvestmentIncome us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceCompany723NANANA702NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetInvestmentIncome us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate978NANANA956NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetInvestmentIncome us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,pfg:SegmentPrincipalInternational104NA172184146NA112163162NA120156166NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetInvestmentIncome us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments,us-gaap:Subsegments us-gaap:OperatingSegments,pfg:SegmentRetirementAndIncomeSolutions,pfg:SubsegmentRetirementAndIncomeSolutionsFee104NA10110499NA116106110NA108113119NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetInvestmentIncome us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments,us-gaap:Subsegments us-gaap:OperatingSegments,pfg:SegmentRetirementAndIncomeSolutions,pfg:SubsegmentRetirementAndIncomeSolutionsSpread536NA509531495NA467433428NA413411402NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetInvestmentIncome us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments,us-gaap:Subsegments us-gaap:OperatingSegments,pfg:SegmentUSInsuranceSolutions,pfg:SubsegmentIndividualLifeInsurance166NA178179169NA167162161NA161163157NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RealizedInvestmentGainsLosses us-gaap:InvestmentType us-gaap:Derivative290NA-1145NA41-379NA-38-103-6NA-4-27185NA54-5762NA-215-11NANANANANANANANANANANANANANANANANANANANA
us-gaap:PolicyholderBenefitsAndClaimsIncurredNet 2858NA284024462195NA264216991411NA250418581657NA148216591658NA186920541236NA111312681227NA1096109510941154164711101212NA113110131191NA132013371275NANANANA
 us-gaap:PolicyholderBenefitsAndClaimsIncurredNet us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceCompany2633NANANA1944NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PolicyholderBenefitsAndClaimsIncurredNet us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate2858NANANA2195NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IncomeTaxExpenseBenefit 43NA615873NA1095554NA3445060NA437270NA682929NA1418852NA61293834-95058NA718260NA121352NANANANA
 us-gaap:IncomeTaxExpenseBenefit us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceCompany104NANANA95NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeTaxExpenseBenefit us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate68NANANA84NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss ▂▂▁▃▃▁▄▄▃██▂▂288300277386429236456456397841810309348NA308322368NA300257422NA248314301NA253230186223187181209NA71266204NA150142199NANANANA
 us-gaap:NetIncomeLoss us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalFinancialServicesAndOther316NANANA462NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceCompany369NANANA295NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,srt:ParentCompany288NANANA429NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate334NANANA482NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiaryPrincipalFinancialServicesConsolidate316NANANA462NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,srt:ParentCompany288NANANA429NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:Assets ▆███▇▆▇▇▇▇▇▆▆▅▆▅▅▅▅▅▅▅▅▅▅▄▄▄▄▂▂▁▂▁▁▁▁▁246903276087270238267918259419243036258758252104253636253941247933240153235496228014230367223074217570218685215365222270222494219087216422218322211193208191201687196512200762161926159193152050153738148298143302149278147549145631NANANA137759NANANA
 us-gaap:Assets us-gaap:ConsolidatedEntities pfg:VariableInterestEntityPrimaryBeneficiaryMandatoryRetirementSavings▁█3153539891NANANA37915NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Assets us-gaap:ConsolidatedEntities us-gaap:VariableInterestEntityPrimaryBeneficiary▁█3233140802NANANA38922NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Assets us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalFinancialServicesAndOther▁▆██67350777167965380544NA71935NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Assets us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceCompany▁█▆▅202810222628217134212845NA193360NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Assets us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate▁█▇▆245048274431268779266586NA242876NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Assets us-gaap:StatementBusinessSegments pfg:SegmentPrincipalInternational▅▇▇▇▇▆▇▇▇▇▇▆▆▆▆▆▆▇▇▇▇▇████▇▇█▂▂▂▂▁▁▁394454885748927512854947746701497064947252923516844970447476474404511846746452494452350588504585286553628535315697457144541915424353158536375612219267188491722917248156621536613640NA12774NANANANANANANA
 us-gaap:Assets us-gaap:StatementBusinessSegments pfg:SegmentRetirementAndIncomeSolutions▆█▇▇▆▄▆▅▅▅▅▄▃▃▃▂▂▁174996192698186731181663176073163833176653170608168851169757166508162151158505152721153275148097144101139678NANANA137860NANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Assets us-gaap:StatementBusinessSegments pfg:SegmentUSInsuranceSolutions██▇▇▇▆▆▆▆▆▅▅▅▅▅▅▄▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▁▁▁▁279282866927838271782637025388255072526625118250922449624112235532314423606231012259622156221802207122068215542121521022206022003319754194721951819017186821808217669177901731817216NA16558NANANANANANANA
us-gaap:Liabilities ▇███▇▆▇▇▇▇▇▆▆▆▆▅▅▅▅▅▅▅▅▅▅▅▄▄▄▂▂▂▂▁▁▁▁▁233691261137254996253511246120231188246841240258241252240918235737228820224716217623219313212169207199209222205601212436211937208797205997207580200855198167192079187050190877152092149286142555143986138285133012138610137176135746NANANA129743NANANA
 us-gaap:Liabilities us-gaap:ConsolidatedEntities pfg:VariableInterestEntityPrimaryBeneficiaryMandatoryRetirementSavings▁█3125639524NANANA37579NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Liabilities us-gaap:ConsolidatedEntities us-gaap:VariableInterestEntityPrimaryBeneficiary▁█3132639713NANANA37742NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Liabilities us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalFinancialServicesAndOther▁▆▇█51399599826149763582NA57745NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Liabilities us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceCompany▁█▆▅192774211262205449202059NA184529NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Liabilities us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate▁█▆▆229717257292251054249694NA227759NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
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 us-gaap:RetainedEarningsAccumulatedDeficit us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate▁▃██2788298533683343NA3549NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RetainedEarningsAccumulatedDeficit us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiaryPrincipalFinancialServicesConsolidate▁▄▇█6149626363686412NA5716NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RetainedEarningsAccumulatedDeficit us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,srt:ParentCompany█▆▃▁11198110741092710805NA10290NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:TreasuryStockValue █▇▇▇▇▇▆▆▆▅▅▅▅▅▅▅▅▄▄▄▄▄▄▃▃▃▃▃▃▃▃▃▂▂▂▂▁▁79137681759875547554740071907125692867296726667766516508647664416336623161186006600659305930585757975708570756455645555455545484534552815181496147314725NANANA4722NANANA
 us-gaap:TreasuryStockValue us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,srt:ParentCompany█▃▂▁7913768175987554NA7400NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:TreasuryStockValue us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,srt:ParentCompany█▃▂▁7913768175987554NA7400NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▃▇█▆▄▁▂▂▄▅▅▅▄▃▅▅▄▃▄▄▅▅▆▆▆▅▅▅▆▆▇▆▆▅▆▇▆▅-59910371307647-418-1565-1347-1137-46916547-116-455-67591-19-356-882-524-3262850380599361183-170621631880550488201409698525272NANANA-1042NANANA
 us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceCompany▁▇█▄1336262028822066NA55NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ConsolidationEliminations,pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor█▂▁▃186-3134-3595-2294NA1986NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate▁▇█▆-14165418901239NA-903NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities 1589NANANA1176NANANA746NANANA522NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInOperatingActivities us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalFinancialServicesAndOther913NANANA634NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInOperatingActivities us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceCompany1711NANANA1376NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInOperatingActivities us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate1461NANANA1033NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetCashProvidedByUsedInInvestingActivities -912NANANA-1491NANANA-979NANANA-1831NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ConsolidationEliminations,pfg:ConsolidationEliminationsAndOtherNotesGuarantor170NANANA562NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,srt:ParentCompany413NANANA205NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiaryPrincipalFinancialServicesConsolidate465NANANA14NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,srt:ParentCompany413NANANA205NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetCashProvidedByUsedInFinancingActivities 290NANANA-403NANANA98NANANA123NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ConsolidationEliminations,pfg:ConsolidationEliminationsAndOtherNotesGuarantor849NANANA409NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ConsolidationEliminations,pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor894NANANA304NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate213NANANA-194NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities 1589NANANA1176NANANA746NANANA522NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInOperatingActivities us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalFinancialServicesAndOther913NANANA634NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInOperatingActivities us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceCompany1711NANANA1376NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInOperatingActivities us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate1461NANANA1033NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss ▂▂▁▃▃▁▄▄▃██▂▂288300277386429236456456397841810309348NA308322368NA300257422NA248314301NA253230186223187181209NA71266204NA150142199NANANANA
 us-gaap:NetIncomeLoss us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalFinancialServicesAndOther316NANANA462NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceCompany369NANANA295NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,srt:ParentCompany288NANANA429NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate334NANANA482NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiaryPrincipalFinancialServicesConsolidate316NANANA462NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,srt:ParentCompany288NANANA429NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ProfitLoss ▃▃▃▄▄▂▅▅▄██▃▄▃▃▃▄▃▃▃▄▃▃▃▃▃▃▃▂▂▂▂▂▂▁▃▂▂▂▂▂▂▂▂▂28531528439245223146045940284281331435333832732736925830026442928025231932425025923619023019118421817166289223218151144203154204164122
 us-gaap:ProfitLoss us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalFinancialServicesAndOther312NANANA482NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceCompany369NANANA295NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,srt:ParentCompany288NANANA429NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate331NANANA504NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiaryPrincipalFinancialServicesConsolidate316NANANA462NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,srt:ParentCompany288NANANA429NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities -912NANANA-1491NANANA-979NANANA-1831NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ConsolidationEliminations,pfg:ConsolidationEliminationsAndOtherNotesGuarantor170NANANA562NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,srt:ParentCompany413NANANA205NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiaryPrincipalFinancialServicesConsolidate465NANANA14NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,srt:ParentCompany413NANANA205NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities 290NANANA-403NANANA98NANANA123NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ConsolidationEliminations,pfg:ConsolidationEliminationsAndOtherNotesGuarantor849NANANA409NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ConsolidationEliminations,pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor894NANANA304NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate213NANANA-194NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ProceedsFromIssuanceOfLongTermDebt us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiaryPrincipalFinancialServicesConsolidate2NANANA2NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:RepaymentsOfLongTermDebt 64NANANA0NANANA0NANANANANANANANANANANA19NANANA100NANANA0NANANA0NANANA1NANANA3NANANANA
 us-gaap:RepaymentsOfLongTermDebt us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalFinancialServicesAndOther65NANANA6NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RepaymentsOfLongTermDebt us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate64NANANA0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RepaymentsOfLongTermDebt us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiaryPrincipalFinancialServicesConsolidate9NANANA9NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PaymentsForRepurchaseOfCommonStock 231NANANA153NANANA199NANANA142NANANA105NANANA75NANANA89NANANA90NANANA64NANANA5NANANA1NANANANA
 us-gaap:PaymentsForRepurchaseOfCommonStock us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,srt:ParentCompany231NANANA153NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PaymentsForRepurchaseOfCommonStock us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,srt:ParentCompany231NANANA153NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:RepaymentsOfLongTermDebt 64NANANA0NANANA0NANANANANANANANANANANA19NANANA100NANANA0NANANA0NANANA1NANANA3NANANANA
 us-gaap:RepaymentsOfLongTermDebt us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesNotesGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalFinancialServicesAndOther65NANANA6NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RepaymentsOfLongTermDebt us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate64NANANA0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RepaymentsOfLongTermDebt us-gaap:ConsolidationItems,pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor srt:ReportableLegalEntities,pfg:SubsidiaryPrincipalFinancialServicesConsolidate9NANANA9NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA

Common Stock Value

us-gaap:CommonStockValue



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
Value444444444444444444444444444444444444444
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Par Or Stated Value Per Share

Shares Outstanding

us-gaap:StatementEquityComponents

us-gaap:SharesOutstanding

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-31
Value273276278278278279283284287289288288288287287288290291293294294293293293294295293293293293293295300301305313321320320319319259
Percentage of SharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Shares Issued

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued



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
Value480479479478478476476476476474473472471469468468468466466465464462462461460459458456455453453452452450450449449448447
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value273276278278278279283284287289288288288287287288290291293294294293293293294295293293293293293295300301305313321320319
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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
Value277281281280287289292293292292291292294298298298298298299298297297297301304314323324323322322
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
Value275279279278284286289289288288288289291295295294294294295294294294294299301311320321320320319
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 End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value1.051.080.991.381.540.841.61.591.372.912.81.071.211.11.071.111.260.871.020.821.410.920.781.040.960.790.830.760.610.740.610.580.670.540.20.810.610.620.440.420.60.440.580.520.43
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value1.041.070.981.371.530.831.591.581.362.872.761.061.191.091.061.11.250.861.010.811.390.910.771.030.950.780.820.750.610.740.60.580.660.540.20.80.60.620.440.420.590.440.570.520.43
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value455140474458397237433770434832342883323746273178304935132818302530362807324032592657290824842606247826722239221021662295270421182095205920882342221923722288223322642232227021572188
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-03-31
Value-467-384
Percentage of Revenues-10.3-10.3
Percentage of Revenues-10.3-10.3
Percentage of Revenues srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherNotesGuarantor100.0100.0

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value928931
Percentage of Revenues20.424.9
Percentage of Revenues20.424.9
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther100.0100.0

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value40813186
Percentage of Revenues89.785.1
Percentage of Revenues89.785.1
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceCompany100.0100.0

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value810
Percentage of Revenues0.20.3
Percentage of Revenues0.20.3
Percentage of Revenues srt:ReportableLegalEntities srt:ParentCompany100.0100.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-03-31
Value0-1
Percentage of Revenues-0.0-0.0
Percentage of Revenues-0.0-0.0
Percentage of Revenues srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor100.0100.0

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value44423730
Percentage of Revenues97.699.6
Percentage of Revenues97.699.6
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate100.0100.0

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-03-31
Value1004
Percentage of Revenues2.20.1
Percentage of Revenues2.20.1
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiaryPrincipalFinancialServicesConsolidate100.0100.0

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value810
Percentage of Revenues0.20.3
Percentage of Revenues0.20.3
Percentage of Revenues srt:ReportableLegalEntities srt:ParentCompany100.0100.0

Premiums Earned Net

us-gaap:PremiumsEarnedNet



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value229122741932172421721265995212614521248100212761282155716829168758358037037376947001158681679672751797865868878
Percentage of PremiumsEarnedNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues50.351.048.746.150.039.134.545.945.740.935.642.242.248.051.634.535.332.032.431.433.332.130.542.832.232.432.232.135.937.838.938.8

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value145182
Percentage of PremiumsEarnedNet6.410.6
Percentage of Revenues3.24.9
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther15.719.6

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value21451542
Percentage of PremiumsEarnedNet93.689.4
Percentage of Revenues47.141.2
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceCompany52.648.4

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value22911724
Percentage of PremiumsEarnedNet100.0100.0
Percentage of Revenues50.346.1
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate51.646.2

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, pfg:SegmentPrincipalInternational



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value851151091175510197435552
Percentage of PremiumsEarnedNet3.75.15.76.82.68.09.82.03.84.2
Percentage of Revenues1.92.62.83.11.33.13.40.91.71.7
Percentage of Revenues us-gaap:OperatingSegments pfg:SegmentPrincipalInternational0.00.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments

us-gaap:OperatingSegments, pfg:SegmentRetirementAndIncomeSolutions, pfg:SubsegmentRetirementAndIncomeSolutionsFee



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value1101101001
Percentage of PremiumsEarnedNet0.10.00.00.10.10.10.20.00.00.1
Percentage of Revenues0.00.00.00.00.00.00.10.00.00.0
Percentage of Revenues us-gaap:OperatingSegments pfg:SegmentRetirementAndIncomeSolutions pfg:SubsegmentRetirementAndIncomeSolutionsFee0.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, pfg:SegmentRetirementAndIncomeSolutions, pfg:SubsegmentRetirementAndIncomeSolutionsSpread



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value15211499117195714955552881495814623
Percentage of PremiumsEarnedNet66.465.960.655.568.943.929.070.356.050.0
Percentage of Revenues33.433.629.525.634.417.210.032.325.620.4
Percentage of Revenues us-gaap:OperatingSegments pfg:SegmentRetirementAndIncomeSolutions pfg:SubsegmentRetirementAndIncomeSolutionsSpread0.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, pfg:SegmentUSInsuranceSolutions, pfg:SubsegmentIndividualLifeInsurance



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value94797992808090819292
Percentage of PremiumsEarnedNet4.13.54.15.43.76.49.13.86.47.4
Percentage of Revenues2.11.82.02.51.92.53.11.82.93.0
Percentage of Revenues us-gaap:OperatingSegments pfg:SegmentUSInsuranceSolutions pfg:SubsegmentIndividualLifeInsurance0.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, pfg:SegmentUSInsuranceSolutions, pfg:SubsegmentSpecialtyBenefitsInsurance



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value588579571555539527517505490478
Percentage of PremiumsEarnedNet25.725.529.632.224.841.751.923.833.738.4
Percentage of Revenues12.913.014.414.812.416.317.910.915.415.7
Percentage of Revenues us-gaap:OperatingSegments pfg:SegmentUSInsuranceSolutions pfg:SubsegmentSpecialtyBenefitsInsurance0.00.00.00.00.00.00.00.00.00.0

Net Investment Income

us-gaap:NetInvestmentIncome



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value9839961037961919889902838866877856799761753789723770829844784749789845783801824815873859880877863
Percentage of NetInvestmentIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues21.622.426.125.721.127.531.318.127.328.830.426.425.123.224.227.231.031.834.135.033.936.436.829.037.839.439.037.338.738.539.338.1

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-03-31
Value-365-292
Percentage of NetInvestmentIncome-37.2-30.4
Percentage of Revenues-8.0-7.8
Percentage of Revenues srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherNotesGuarantor78.376.1

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value622546
Percentage of NetInvestmentIncome63.356.8
Percentage of Revenues13.714.6
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther67.158.6

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value723702
Percentage of NetInvestmentIncome73.573.1
Percentage of Revenues15.918.8
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceCompany17.722.0

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value35
Percentage of NetInvestmentIncome0.30.5
Percentage of Revenues0.10.1
Percentage of Revenues srt:ReportableLegalEntities srt:ParentCompany39.548.5

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-03-31
Value21
Percentage of NetInvestmentIncome0.30.2
Percentage of Revenues0.10.0
Percentage of Revenues srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor-2500.0-150.0

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value978956
Percentage of NetInvestmentIncome99.599.5
Percentage of Revenues21.525.5
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate22.025.6

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-03-31
Value-1-2
Percentage of NetInvestmentIncome-0.1-0.2
Percentage of Revenues-0.0-0.1
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiaryPrincipalFinancialServicesConsolidate-1.1-52.3

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value35
Percentage of NetInvestmentIncome0.30.5
Percentage of Revenues0.10.1
Percentage of Revenues srt:ReportableLegalEntities srt:ParentCompany39.548.5

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, pfg:SegmentCorporate



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value52191934222434231727
Percentage of NetInvestmentIncome5.31.91.93.62.52.83.82.82.03.1
Percentage of Revenues1.20.40.50.90.50.81.20.50.50.9
Percentage of Revenues us-gaap:OperatingSegments pfg:SegmentCorporate0.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, pfg:SegmentPrincipalGlobalInvestors



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value2222111011
Percentage of NetInvestmentIncome0.20.20.30.20.10.10.20.10.20.1
Percentage of Revenues0.10.00.10.10.00.00.10.00.00.0
Percentage of Revenues us-gaap:OperatingSegments pfg:SegmentPrincipalGlobalInvestors0.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, pfg:SegmentPrincipalInternational



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value104172184146112163162120156166
Percentage of NetInvestmentIncome10.617.317.815.212.218.318.014.418.119.0
Percentage of Revenues2.33.94.63.92.65.05.62.64.95.5
Percentage of Revenues us-gaap:OperatingSegments pfg:SegmentPrincipalInternational0.00.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments

us-gaap:OperatingSegments, pfg:SegmentRetirementAndIncomeSolutions, pfg:SubsegmentRetirementAndIncomeSolutionsFee



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value10410110499116106110108113119
Percentage of NetInvestmentIncome10.610.210.110.412.611.912.213.013.113.6
Percentage of Revenues2.32.32.62.72.73.33.82.33.63.9
Percentage of Revenues us-gaap:OperatingSegments pfg:SegmentRetirementAndIncomeSolutions pfg:SubsegmentRetirementAndIncomeSolutionsFee0.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, pfg:SegmentRetirementAndIncomeSolutions, pfg:SubsegmentRetirementAndIncomeSolutionsSpread



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value536509531495467433428413411402
Percentage of NetInvestmentIncome54.551.151.251.650.848.747.549.447.545.9
Percentage of Revenues11.811.413.413.210.813.414.98.913.013.2
Percentage of Revenues us-gaap:OperatingSegments pfg:SegmentRetirementAndIncomeSolutions pfg:SubsegmentRetirementAndIncomeSolutionsSpread0.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, pfg:SegmentUSInsuranceSolutions, pfg:SubsegmentIndividualLifeInsurance



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value166178179169167162161161163157
Percentage of NetInvestmentIncome17.017.917.317.618.218.317.919.318.818.0
Percentage of Revenues3.74.04.54.53.95.05.63.55.15.2
Percentage of Revenues us-gaap:OperatingSegments pfg:SegmentUSInsuranceSolutions pfg:SubsegmentIndividualLifeInsurance0.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, pfg:SegmentUSInsuranceSolutions, pfg:SubsegmentSpecialtyBenefitsInsurance



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value41424537443540363840
Percentage of NetInvestmentIncome4.34.24.43.94.94.04.54.34.44.7
Percentage of Revenues0.90.91.21.01.01.11.40.81.21.3
Percentage of Revenues us-gaap:OperatingSegments pfg:SegmentUSInsuranceSolutions pfg:SubsegmentSpecialtyBenefitsInsurance0.00.00.00.00.00.00.00.00.00.0

us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:InterestRateContract, us-gaap:CashFlowHedging, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value4545555
Percentage of NetInvestmentIncome0.50.50.50.50.60.60.6
Percentage of Revenues0.10.10.10.10.10.20.2
Percentage of Revenues us-gaap:InterestRateContract us-gaap:CashFlowHedging us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.0

Realized Investment Gains Losses

us-gaap:InvestmentType

us-gaap:RealizedInvestmentGainsLosses

pfg:MortgageLoans



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-03-31
Value-15000120100102-12-2-121
Percentage of RealizedInvestmentGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-0.3-0.00.00.00.00.10.00.00.0-0.00.00.00.1-0.00.1-0.1-0.50.1
Percentage of Revenues pfg:MortgageLoans0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

pfg:OtherInvestmentTypes



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-31
Value-72-72-1249-761291571991428624-2713-10627
Percentage of RealizedInvestmentGainsLosses463.772500.0-4266.716600.0-5907.75164.03800.059916.79400.0-3700.02050.06700.0100.0-338.5-1173.9-566.788.30.0507.1
Percentage of Revenues-1.6-1.6-0.31.3-1.84.00.515.50.30.51.00.20.10.1-0.80.5-0.42.40.3
Percentage of Revenues pfg:OtherInvestmentTypes0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Derivative



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-31
Value290-114541-379-38-103-6-4-2718554-5762-215-11
Percentage of RealizedInvestmentGainsLosses-1850.311700.01533.31666.73207.7-1496.02350.0-3175.0-103600.01675.0-350.0-27900.07424.0-4153.8-2504.3-2608.316.70.0-807.1
Percentage of Revenues6.4-0.30.10.11.0-1.20.3-0.8-3.3-0.2-0.2-0.96.11.7-1.82.4-0.10.6-0.5
Percentage of Revenues us-gaap:Derivative0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Policyholder Benefits And Claims Incurred Net

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value28582840244621952642169914112504185816571482165916581869205412361113126812271096109510941154164711101212113110131191132013371275
Percentage of PolicyholderBenefitsAndClaimsIncurredNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues62.863.761.658.660.852.548.954.158.554.352.654.954.657.763.046.544.848.749.548.949.650.550.360.952.457.954.243.353.757.759.956.3

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-03-31
Value-2-2
Percentage of PolicyholderBenefitsAndClaimsIncurredNet-0.1-0.1
Percentage of Revenues-0.1-0.1
Percentage of Revenues srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherNotesGuarantor0.60.8

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value228253
Percentage of PolicyholderBenefitsAndClaimsIncurredNet8.011.6
Percentage of Revenues5.06.8
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther24.627.2

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value26331944
Percentage of PolicyholderBenefitsAndClaimsIncurredNet92.188.6
Percentage of Revenues57.951.9
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceCompany64.561.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value28582195
Percentage of PolicyholderBenefitsAndClaimsIncurredNet100.0100.0
Percentage of Revenues62.858.6
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate64.358.8

Deferred Policy Acquisition Cost Amortization Expense

Interest Expense

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value4361587310955543445060437270682929141885261293834-95058718260121352
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.91.41.52.02.51.71.97.41.62.01.52.42.32.10.91.15.73.42.12.71.31.81.5-0.42.42.83.43.52.70.50.62.3

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value-51-9
Percentage of IncomeTaxExpenseBenefit-118.8-13.3
Percentage of Revenues-1.1-0.3
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther-5.5-1.1

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value10495
Percentage of IncomeTaxExpenseBenefit242.6128.8
Percentage of Revenues2.32.5
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceCompany2.63.0

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value-10-11
Percentage of IncomeTaxExpenseBenefit-23.4-15.3
Percentage of Revenues-0.2-0.3
Percentage of Revenues srt:ReportableLegalEntities srt:ParentCompany-117.4-109.7

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value6884
Percentage of IncomeTaxExpenseBenefit158.6113.7
Percentage of Revenues1.52.2
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate1.52.3

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-03-31
Value-151
Percentage of IncomeTaxExpenseBenefit-35.21.6
Percentage of Revenues-0.30.0
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiaryPrincipalFinancialServicesConsolidate-15.227.3

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value-10-11
Percentage of IncomeTaxExpenseBenefit-23.4-15.3
Percentage of Revenues-0.2-0.3
Percentage of Revenues srt:ReportableLegalEntities srt:ParentCompany-117.4-109.7

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value28830027738642923645645639784181030934830832236830025742224831430125323018622318718120971266204150142199
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues6.37.46.29.711.56.310.514.113.826.017.59.711.410.910.712.19.37.915.910.012.112.211.310.48.69.76.98.610.03.411.49.26.66.48.8

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-03-31
Value-686-758
Percentage of NetIncomeLoss-237.5-176.4
Percentage of Revenues-15.1-20.3
Percentage of Revenues srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherNotesGuarantor146.9197.3

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value316462
Percentage of NetIncomeLoss109.6107.7
Percentage of Revenues7.012.4
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther34.149.7

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value369295
Percentage of NetIncomeLoss127.968.7
Percentage of Revenues8.17.9
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceCompany9.19.3

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value288429
Percentage of NetIncomeLoss100.0100.0
Percentage of Revenues6.311.5
Percentage of Revenues srt:ReportableLegalEntities srt:ParentCompany3359.34173.8

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-03-31
Value-651-945
Percentage of NetIncomeLoss-225.5-219.9
Percentage of Revenues-14.3-25.3
Percentage of Revenues srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor651500.078783.3

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value334482
Percentage of NetIncomeLoss115.9112.2
Percentage of Revenues7.412.9
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate7.512.9

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-03-31
Value316462
Percentage of NetIncomeLoss109.6107.7
Percentage of Revenues7.012.4
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiaryPrincipalFinancialServicesConsolidate316.310520.5

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value288429
Percentage of NetIncomeLoss100.0100.0
Percentage of Revenues6.311.5
Percentage of Revenues srt:ReportableLegalEntities srt:ParentCompany3359.34173.8

Assets

us-gaap:Assets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value246903276087270238267918259419243036258758252104253636253941247933240153235496228014230367223074217570218685215365222270222494219087216422218322211193208191201687196512200762161926159193152050153738148298143302149278147549145631137759
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
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

us-gaap:ConsolidatedEntities

pfg:VariableInterestEntityPrimaryBeneficiaryGrantorTrusts



Period End2020-03-312019-12-312018-12-31
Value359995
Percentage of Assets0.00.00.0
Percentage of Assets0.00.00.0
Percentage of Assets pfg:VariableInterestEntityPrimaryBeneficiaryGrantorTrusts100.0100.0100.0

pfg:VariableInterestEntityPrimaryBeneficiaryMandatoryRetirementSavings



Period End2020-03-312019-12-312018-12-31
Value315353989137915
Percentage of Assets12.814.415.6
Percentage of Assets12.814.415.6
Percentage of Assets pfg:VariableInterestEntityPrimaryBeneficiaryMandatoryRetirementSavings100.0100.0100.0

pfg:VariableInterestEntityPrimaryBeneficiaryRealEstate



Period End2020-03-312019-12-312018-12-31
Value421479379
Percentage of Assets0.20.20.2
Percentage of Assets0.20.20.2
Percentage of Assets pfg:VariableInterestEntityPrimaryBeneficiaryRealEstate100.0100.0100.0

pfg:VariableInterestEntityPrimaryBeneficiarySponsoredInvestmentFunds



Period End2020-03-312019-12-312018-12-31
Value339331526
Percentage of Assets0.10.10.2
Percentage of Assets0.10.10.2
Percentage of Assets pfg:VariableInterestEntityPrimaryBeneficiarySponsoredInvestmentFunds100.0100.0100.0

us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-312018-12-31
Value323314080238922
Percentage of Assets13.114.816.0
Percentage of Assets13.114.816.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary100.0100.0100.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value-40449-43120-45553-43680-37364
Percentage of Assets-16.4-15.6-16.9-16.3-15.4
Percentage of Assets-16.4-15.6-16.9-16.3-15.4
Percentage of Assets srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherNotesGuarantor100.0100.0100.0100.0100.0

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value6735077716796538054471935
Percentage of Assets27.328.129.530.129.6
Percentage of Assets27.328.129.530.129.6
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther100.0100.0100.0100.0100.0

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value202810222628217134212845193360
Percentage of Assets82.180.680.379.479.6
Percentage of Assets82.180.680.379.479.6
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceCompany100.0100.0100.0100.0100.0

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1719218863190031820815104
Percentage of Assets7.06.87.06.86.2
Percentage of Assets7.06.87.06.86.2
Percentage of Assets srt:ReportableLegalEntities srt:ParentCompany100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value-32415-36049-36666-35050-30072
Percentage of Assets-13.1-13.1-13.6-13.1-12.4
Percentage of Assets-13.1-13.1-13.6-13.1-12.4
Percentage of Assets srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor100.0100.0100.0100.0100.0

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value245048274431268779266586242876
Percentage of Assets99.299.499.599.599.9
Percentage of Assets99.299.499.599.599.9
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate100.0100.0100.0100.0100.0

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1707818841191211817415126
Percentage of Assets6.96.87.16.86.2
Percentage of Assets6.96.87.16.86.2
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiaryPrincipalFinancialServicesConsolidate100.0100.0100.0100.0100.0

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1719218863190031820815104
Percentage of Assets7.06.87.06.86.2
Percentage of Assets7.06.87.06.86.2
Percentage of Assets srt:ReportableLegalEntities srt:ParentCompany100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

pfg:SegmentCorporate



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
Value2359349945025478520248124528446645085083480740214130507847894773455643814172416741334276372640643840386532983381349849604257398437573529380143334947
Percentage of Assets1.01.31.72.02.02.01.81.81.82.01.91.71.82.22.12.12.12.01.91.91.92.01.71.91.81.91.61.71.73.12.72.62.42.42.72.93.4
Percentage of Assets1.01.31.72.02.02.01.81.81.82.01.91.71.82.22.12.12.12.01.91.91.92.01.71.91.81.91.61.71.73.12.72.62.42.42.72.93.4
Percentage of Assets pfg:SegmentCorporate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

pfg:SegmentPrincipalGlobalInvestors



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
Value2173236322382312229623012362228922342322241723921866195219501853179218801149111210941175120011831165131212731255120712821265121817951833161514591308
Percentage of Assets0.90.90.80.90.90.90.90.90.90.91.01.00.80.90.80.80.80.90.50.50.50.50.60.50.60.60.60.60.60.80.80.81.21.21.11.00.9
Percentage of Assets0.90.90.80.90.90.90.90.90.90.91.01.00.80.90.80.80.80.90.50.50.50.50.60.50.60.60.60.60.60.80.80.81.21.21.11.00.9
Percentage of Assets pfg:SegmentPrincipalGlobalInvestors100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

pfg:SegmentPrincipalInternational



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
Value39445488574892751285494774670149706494725292351684497044747647440451184674645249445235058850458528655362853531569745714454191542435315853637561221926718849172291724815662153661364012774
Percentage of Assets16.017.718.119.119.119.219.219.620.920.420.019.820.119.820.320.320.523.123.423.824.124.426.326.225.726.126.427.328.011.911.811.311.210.610.79.18.8
Percentage of Assets16.017.718.119.119.119.219.219.620.920.420.019.820.119.820.320.320.523.123.423.824.124.426.326.225.726.126.427.328.011.911.811.311.210.610.79.18.8
Percentage of Assets pfg:SegmentPrincipalInternational100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

pfg:SegmentRetirementAndIncomeSolutions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value174996192698186731181663176073163833176653170608168851169757166508162151158505152721153275148097144101139678137860
Percentage of Assets70.969.869.167.867.967.468.367.766.666.867.267.567.367.066.566.466.263.962.9
Percentage of Assets70.969.869.167.867.967.468.367.766.666.867.267.567.367.066.566.466.263.962.9
Percentage of Assets pfg:SegmentRetirementAndIncomeSolutions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

pfg:SegmentUSInsuranceSolutions



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
Value27928286692783827178263702538825507252662511825092244962411223553231442360623101225962215622180220712206821554212152102220602200331975419472195181901718682180821766917790173181721616558
Percentage of Assets11.310.410.310.110.210.49.910.09.99.99.910.010.010.210.210.410.410.110.39.99.99.89.89.69.89.69.89.99.711.711.711.911.512.012.111.511.4
Percentage of Assets11.310.410.310.110.210.49.910.09.99.99.910.010.010.210.210.410.410.110.39.99.99.89.89.69.89.69.89.99.711.711.711.911.512.012.111.511.4
Percentage of Assets pfg:SegmentUSInsuranceSolutions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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
Value233691261137254996253511246120231188246841240258241252240918235737228820224716217623219313212169207199209222205601212436211937208797205997207580200855198167192079187050190877152092149286142555143986138285133012138610137176135746129743
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 Assets94.694.694.494.694.995.195.495.395.194.995.195.395.495.495.295.195.295.795.595.695.395.395.295.195.195.295.295.295.193.993.893.893.793.292.892.993.093.294.2

us-gaap:ConsolidatedEntities

pfg:VariableInterestEntityPrimaryBeneficiaryGrantorTrusts



Period End2020-03-312019-12-312018-12-31
Value349889
Percentage of Liabilities0.00.00.0
Percentage of Assets0.00.00.0
Percentage of Assets pfg:VariableInterestEntityPrimaryBeneficiaryGrantorTrusts98.998.794.1

pfg:VariableInterestEntityPrimaryBeneficiaryMandatoryRetirementSavings



Period End2020-03-312019-12-312018-12-31
Value312563952437579
Percentage of Liabilities13.415.116.3
Percentage of Assets12.714.315.5
Percentage of Assets pfg:VariableInterestEntityPrimaryBeneficiaryMandatoryRetirementSavings99.199.199.1

pfg:VariableInterestEntityPrimaryBeneficiaryRealEstate



Period End2020-03-312019-12-312018-12-31
Value268870
Percentage of Liabilities0.00.00.0
Percentage of Assets0.00.00.0
Percentage of Assets pfg:VariableInterestEntityPrimaryBeneficiaryRealEstate6.418.318.6

pfg:VariableInterestEntityPrimaryBeneficiarySponsoredInvestmentFunds



Period End2020-03-312019-12-312018-12-31
Value823
Percentage of Liabilities0.00.00.0
Percentage of Assets0.00.00.0
Percentage of Assets pfg:VariableInterestEntityPrimaryBeneficiarySponsoredInvestmentFunds2.40.70.7

us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-312018-12-31
Value313263971337742
Percentage of Liabilities13.415.216.3
Percentage of Assets12.714.415.5
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary96.997.397.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value-14767-14353-16149-16303-14800
Percentage of Liabilities-6.3-5.5-6.3-6.4-6.4
Percentage of Assets-6.0-5.2-6.0-6.1-6.1
Percentage of Assets srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherNotesGuarantor36.533.335.537.339.6

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value5139959982614976358257745
Percentage of Liabilities22.023.024.125.125.0
Percentage of Assets20.821.722.823.723.8
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther76.377.277.278.980.3

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value192774211262205449202059184529
Percentage of Liabilities82.580.980.679.779.8
Percentage of Assets78.176.576.075.475.9
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceCompany95.194.994.694.995.4

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value42844245419941733714
Percentage of Liabilities1.81.61.61.61.6
Percentage of Assets1.71.51.61.61.5
Percentage of Assets srt:ReportableLegalEntities srt:ParentCompany24.922.522.122.924.6

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value-1742-1840-1660-1939-1678
Percentage of Liabilities-0.7-0.7-0.7-0.8-0.7
Percentage of Assets-0.7-0.7-0.6-0.7-0.7
Percentage of Assets srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor5.45.14.55.55.6

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value229717257292251054249694227759
Percentage of Liabilities98.398.598.598.598.5
Percentage of Assets93.093.292.993.293.7
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate93.793.893.493.793.8

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value14321440140315831393
Percentage of Liabilities0.60.60.60.60.6
Percentage of Assets0.60.50.50.60.6
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiaryPrincipalFinancialServicesConsolidate8.47.67.38.79.2

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value42844245419941733714
Percentage of Liabilities1.81.61.61.61.6
Percentage of Assets1.71.51.61.61.5
Percentage of Assets srt:ReportableLegalEntities srt:ParentCompany24.922.522.122.924.6

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
Value246903276087270238267918259419243036258758252104253636253941247933240153235496228014230367223074217570218685215365222270222494219087216422218322211193208191201687196512200762161926159193152050153738148298143302149278147549145631137759
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

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value-40449-43120-45553-43680-37364
Percentage of LiabilitiesAndStockholdersEquity-16.4-15.6-16.9-16.3-15.4
Percentage of Assets-16.4-15.6-16.9-16.3-15.4
Percentage of Assets srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherNotesGuarantor100.0100.0100.0100.0100.0

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value6735077716796538054471935
Percentage of LiabilitiesAndStockholdersEquity27.328.129.530.129.6
Percentage of Assets27.328.129.530.129.6
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther100.0100.0100.0100.0100.0

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value202810222628217134212845193360
Percentage of LiabilitiesAndStockholdersEquity82.180.680.379.479.6
Percentage of Assets82.180.680.379.479.6
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceCompany100.0100.0100.0100.0100.0

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1719218863190031820815104
Percentage of LiabilitiesAndStockholdersEquity7.06.87.06.86.2
Percentage of Assets7.06.87.06.86.2
Percentage of Assets srt:ReportableLegalEntities srt:ParentCompany100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value-32415-36049-36666-35050-30072
Percentage of LiabilitiesAndStockholdersEquity-13.1-13.1-13.6-13.1-12.4
Percentage of Assets-13.1-13.1-13.6-13.1-12.4
Percentage of Assets srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor100.0100.0100.0100.0100.0

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value245048274431268779266586242876
Percentage of LiabilitiesAndStockholdersEquity99.299.499.599.599.9
Percentage of Assets99.299.499.599.599.9
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate100.0100.0100.0100.0100.0

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1707818841191211817415126
Percentage of LiabilitiesAndStockholdersEquity6.96.87.16.86.2
Percentage of Assets6.96.87.16.86.2
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiaryPrincipalFinancialServicesConsolidate100.0100.0100.0100.0100.0

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1719218863190031820815104
Percentage of LiabilitiesAndStockholdersEquity7.06.87.06.86.2
Percentage of Assets7.06.87.06.86.2
Percentage of Assets srt:ReportableLegalEntities srt:ParentCompany100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value12907146181480414034126941139011700116391218612849119961116810616102271079410499100419311962096931042210184103161040199879684927893039723975398279422936496379980104021018797277893
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.25.35.55.24.94.74.54.64.85.14.84.74.54.54.74.74.64.34.54.44.74.64.84.84.74.74.64.74.86.06.26.26.16.57.07.06.96.75.7

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value-25682-28766-29403-27377-22563
Percentage of StockholdersEquity-199.0-196.8-198.6-195.1-198.1
Percentage of Assets-10.4-10.4-10.9-10.2-9.3
Percentage of Assets srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherNotesGuarantor63.566.764.562.760.4

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1564617401177181659013733
Percentage of StockholdersEquity121.2119.0119.7118.2120.6
Percentage of Assets6.36.36.66.25.7
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther23.222.422.220.619.1

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value100351136511685107868830
Percentage of StockholdersEquity77.877.878.976.977.5
Percentage of Assets4.14.14.34.03.6
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceCompany4.95.15.45.14.6

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1290714618148041403411390
Percentage of StockholdersEquity100.0100.0100.0100.0100.0
Percentage of Assets5.25.35.55.24.7
Percentage of Assets srt:ReportableLegalEntities srt:ParentCompany75.177.577.977.175.4

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value-30672-34208-35006-33110-28393
Percentage of StockholdersEquity-237.6-234.0-236.5-235.9-249.3
Percentage of Assets-12.4-12.4-13.0-12.4-11.7
Percentage of Assets srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor94.694.995.594.594.4

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1502616806172871651914659
Percentage of StockholdersEquity116.4115.0116.8117.7128.7
Percentage of Assets6.16.16.46.26.0
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate6.16.16.46.26.0

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1564617401177181659113733
Percentage of StockholdersEquity121.2119.0119.7118.2120.6
Percentage of Assets6.36.36.66.25.7
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiaryPrincipalFinancialServicesConsolidate91.692.492.791.390.8

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1290714618148041403411390
Percentage of StockholdersEquity100.0100.0100.0100.0100.0
Percentage of Assets5.25.35.55.24.7
Percentage of Assets srt:ReportableLegalEntities srt:ParentCompany75.177.577.977.175.4

us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312012-12-31
Value-424-435-434-444-501-512-425-434-443-371-395-399-404-408-426-434-442-450-375-387-399-411-145-148-155-488
Percentage of StockholdersEquity-3.3-3.0-2.9-3.2-3.9-4.5-3.6-3.7-3.6-2.9-3.3-3.6-3.8-4.0-3.9-4.1-4.4-4.8-3.9-4.0-3.8-4.0-1.4-1.4-1.6-5.0
Percentage of Assets-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.1-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.1-0.1-0.1-0.3
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1025374615964
Percentage of StockholdersEquity0.80.40.50.40.50.6
Percentage of Assets0.00.00.00.00.00.0
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312012-12-31
Value1350280630662279129419024844791414701400133099583115601439113673298195312591202117412488781418
Percentage of StockholdersEquity10.519.220.716.210.21.72.13.87.511.411.711.99.48.114.513.711.37.910.29.812.111.811.412.09.114.5
Percentage of Assets0.51.01.10.90.50.10.10.20.40.60.60.60.40.40.70.60.50.30.50.40.60.50.50.60.40.9
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312012-12-31
Value-59910371307647-418-1565-1347-1137-46916547-116-455-67591-19-356-882-524-3262850380599183640
Percentage of StockholdersEquity-4.67.18.84.6-3.3-13.7-11.5-9.8-3.91.30.4-1.0-4.3-6.60.9-0.2-3.5-9.5-5.5-3.40.30.53.75.81.96.6
Percentage of Assets-0.20.40.50.2-0.2-0.6-0.5-0.5-0.20.10.0-0.0-0.2-0.30.0-0.0-0.2-0.4-0.2-0.10.00.00.20.30.10.4
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312012-12-31
Value-1627-1341-1353-1198-1222-1259-1166-1142-909-918-945-1031-1030-1093-1035-1019-1031-1148-1116-867-819-686-563-373-361-106
Percentage of StockholdersEquity-12.6-9.2-9.1-8.5-9.6-11.1-10.0-9.8-7.5-7.1-7.9-9.2-9.7-10.7-9.6-9.7-10.3-12.3-11.6-8.9-7.9-6.7-5.5-3.6-3.7-1.1
Percentage of Assets-0.7-0.5-0.5-0.4-0.5-0.5-0.5-0.5-0.4-0.4-0.4-0.4-0.4-0.5-0.4-0.5-0.5-0.5-0.5-0.4-0.4-0.3-0.3-0.2-0.2-0.1
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Cash

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue



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
Value34822515319833152259297729262342233524702795200615342719221822552142256425142264145218631270174213932371170711101661417722791646165128331434216919841877226818271629224026081344
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.40.91.21.20.91.21.10.90.91.01.10.80.71.21.01.01.01.21.21.00.70.90.60.80.71.10.80.60.82.61.41.11.11.91.01.51.31.30.00.00.01.60.00.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value-861-824-680-863-696
Percentage of CashAndCashEquivalentsAtCarryingValue-24.7-32.8-21.3-26.0-23.4
Percentage of Assets-0.3-0.3-0.3-0.3-0.3
Percentage of Assets srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherNotesGuarantor2.11.91.52.01.9

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value19821767176827582014
Percentage of CashAndCashEquivalentsAtCarryingValue56.970.355.383.267.7
Percentage of Assets0.80.60.71.00.8
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther2.92.32.23.42.8

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1908117818088051323
Percentage of CashAndCashEquivalentsAtCarryingValue54.846.856.624.344.5
Percentage of Assets0.80.40.70.30.5
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceCompany0.90.50.80.40.7

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value453394301615334
Percentage of CashAndCashEquivalentsAtCarryingValue13.015.79.418.611.2
Percentage of Assets0.20.10.10.20.1
Percentage of Assets srt:ReportableLegalEntities srt:ParentCompany2.62.11.63.42.2

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value-1043-1133-1059-1268-1103
Percentage of CashAndCashEquivalentsAtCarryingValue-29.9-45.1-33.1-38.2-37.1
Percentage of Assets-0.4-0.4-0.4-0.5-0.5
Percentage of Assets srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor3.23.12.93.63.7

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value34082656336423653096
Percentage of CashAndCashEquivalentsAtCarryingValue97.9105.6105.271.3104.0
Percentage of Assets1.41.01.20.91.3
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate1.41.01.30.91.3

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value6635985921603649
Percentage of CashAndCashEquivalentsAtCarryingValue19.123.818.548.321.8
Percentage of Assets0.30.20.20.60.3
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiaryPrincipalFinancialServicesConsolidate3.93.23.18.84.3

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value453394301615334
Percentage of CashAndCashEquivalentsAtCarryingValue13.015.79.418.611.2
Percentage of Assets0.20.10.10.20.1
Percentage of Assets srt:ReportableLegalEntities srt:ParentCompany2.62.11.63.42.2

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value973967961959933767770762775759754750718699674667657633611601607590590574546500479476472464468469457
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.40.40.40.40.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.20.20.20.20.30.30.30.3

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value216233219220106
Percentage of PropertyPlantAndEquipmentNet22.224.222.922.913.8
Percentage of Assets0.10.10.10.10.0
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther0.30.30.30.30.1

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value757733741739661
Percentage of PropertyPlantAndEquipmentNet77.875.877.177.186.2
Percentage of Assets0.30.30.30.30.3
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceCompany0.40.30.30.30.3

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value973967961959767
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0
Percentage of Assets0.40.40.40.40.3
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate0.40.40.40.40.3

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
Value161616931690111111101100112811031096106810551033103210201034103710371009100597098110071034108510751100112711381197543548542490482413345344345386375
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 Assets0.70.60.60.40.40.50.40.40.40.40.40.40.40.40.40.50.50.50.50.40.40.50.50.50.50.50.60.60.60.30.30.40.30.30.30.20.20.20.30.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value15621639163610571045
Percentage of Goodwill96.696.896.895.195.1
Percentage of Assets0.60.60.60.40.4
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther2.32.12.11.31.5

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value9971075107211111100
Percentage of Goodwill61.763.563.4100.0100.0
Percentage of Assets0.40.40.40.40.5
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate0.40.40.40.40.5

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill



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
Value17161786180113001310131513531355139213141314131113221325134613581370135913981268129113231361141814211459149715171590927927934893890872827829834851
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.60.70.50.50.50.50.50.50.50.50.50.60.60.60.60.60.60.60.60.60.60.60.60.70.70.70.80.80.60.60.60.60.60.60.60.60.60.6

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value16991769178312821295
Percentage of IntangibleAssetsNetExcludingGoodwill99.099.099.098.698.5
Percentage of Assets0.70.60.70.50.5
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther2.52.32.21.61.8

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1717181819
Percentage of IntangibleAssetsNetExcludingGoodwill1.01.01.01.41.5
Percentage of Assets0.00.00.00.00.0
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceCompany0.00.00.00.00.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value11921255126313001315
Percentage of IntangibleAssetsNetExcludingGoodwill69.470.270.1100.0100.0
Percentage of Assets0.50.50.50.50.5
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate0.50.50.50.50.5

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-12-312019-09-30
Value524531538
Percentage of IntangibleAssetsNetExcludingGoodwill30.629.829.9
Percentage of Assets0.20.20.2
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiaryPrincipalFinancialServicesConsolidate3.12.82.8

Finite Lived Intangible Assets Net

Deferred Tax Assets Liabilities Net

Long Term Debt

us-gaap:LongTermDebt



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
Value367037343763376232663259324532193196317831753126312631253278327032693290328633152514253125292529251626012593257827902671218015761570156415701582157915831584
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.51.41.41.41.31.31.31.31.31.31.31.31.31.41.41.51.51.51.51.51.11.21.21.21.21.21.31.31.41.61.41.01.01.11.11.11.11.11.2

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value-653-654-700-713-721
Percentage of LongTermDebt-17.8-17.5-18.6-19.0-22.1
Percentage of Assets-0.3-0.2-0.3-0.3-0.3
Percentage of Assets srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherNotesGuarantor1.61.51.51.61.9

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value697763839852851
Percentage of LongTermDebt19.020.422.322.626.1
Percentage of Assets0.30.30.30.30.4
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther1.01.01.11.11.2

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value36263625362436243129
Percentage of LongTermDebt98.897.196.396.396.0
Percentage of Assets1.51.31.31.41.3
Percentage of Assets srt:ReportableLegalEntities srt:ParentCompany21.119.219.119.920.7

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value-313-320-336-343-366
Percentage of LongTermDebt-8.6-8.6-8.9-9.1-11.3
Percentage of Assets-0.1-0.1-0.1-0.1-0.2
Percentage of Assets srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor1.00.90.91.01.2

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value44108139138129
Percentage of LongTermDebt1.22.93.73.74.0
Percentage of Assets0.00.00.10.10.1
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate0.00.00.10.10.1

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value313320336343366
Percentage of LongTermDebt8.68.68.99.111.2
Percentage of Assets0.10.10.10.10.2
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiaryPrincipalFinancialServicesConsolidate1.81.71.81.92.4

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value36263625362436243129
Percentage of LongTermDebt98.897.196.396.396.0
Percentage of Assets1.51.31.31.41.3
Percentage of Assets srt:ReportableLegalEntities srt:ParentCompany21.119.219.119.920.7

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value37814015403838873261312931613182324533933378337432863242351135043401336933922703
Percentage of LongTermDebt103.0107.5107.3103.399.896.097.498.9101.5106.8106.4107.9105.1103.7107.1107.2104.0102.4103.2106.8
Percentage of Assets1.51.51.51.51.31.31.21.31.31.31.41.41.41.41.51.61.61.51.61.2
Percentage of Assets us-gaap:FairValueInputsLevel2 us-gaap:EstimateOfFairValueFairValueDisclosure0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value4010713713613412711488664946534646423882
Percentage of LongTermDebt1.12.93.63.64.13.93.52.82.11.51.51.61.41.41.31.23.3
Percentage of Assets0.00.00.10.10.10.10.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:FairValueInputsLevel3 us-gaap:EstimateOfFairValueFairValueDisclosure0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value36703734376337623266325932453219319631783175312631263125327832703269329032863315251425312529252925162601
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.51.41.41.41.31.31.31.31.31.31.31.31.31.41.41.51.51.51.51.51.11.21.21.21.21.2
Percentage of Assets us-gaap:CarryingReportedAmountFairValueDisclosure0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value38214122417540233395325732753271331234423425337432863242356535513447341134313437281827862756275226772692
Percentage of LongTermDebt104.1110.4110.9106.9103.999.9100.9101.6103.6108.3107.9107.9105.1103.7108.8108.6105.4103.7104.4103.7112.1110.1109.0108.8106.4103.5
Percentage of Assets1.51.51.51.51.31.31.31.31.31.41.41.41.41.41.51.61.61.61.61.51.31.31.31.31.31.3
Percentage of Assets us-gaap:EstimateOfFairValueFairValueDisclosure0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Minority Interest

us-gaap:MinorityInterest



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
Value656768676766676768727069686669686865656969485257709295105103201812387376309265185157122
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.10.00.00.00.30.30.20.20.10.10.1

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value6567686766
Percentage of MinorityInterest100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.0
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther0.10.10.10.10.1

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value6567686766
Percentage of MinorityInterest100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.0
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate0.00.00.00.00.0

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value12907146181480414034126941139011700116391218612849119961116810616102271079410499100419311962096931042210184103161040199879684927893039723975398279422936496379980104021018797277893
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.25.35.55.24.94.74.54.64.85.14.84.74.54.54.74.74.64.34.54.44.74.64.84.84.74.74.64.74.86.06.26.26.16.57.07.06.96.75.7

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value-25682-28766-29403-27377-22563
Percentage of StockholdersEquity-199.0-196.8-198.6-195.1-198.1
Percentage of Assets-10.4-10.4-10.9-10.2-9.3
Percentage of Assets srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherNotesGuarantor63.566.764.562.760.4

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1564617401177181659013733
Percentage of StockholdersEquity121.2119.0119.7118.2120.6
Percentage of Assets6.36.36.66.25.7
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther23.222.422.220.619.1

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value100351136511685107868830
Percentage of StockholdersEquity77.877.878.976.977.5
Percentage of Assets4.14.14.34.03.6
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceCompany4.95.15.45.14.6

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1290714618148041403411390
Percentage of StockholdersEquity100.0100.0100.0100.0100.0
Percentage of Assets5.25.35.55.24.7
Percentage of Assets srt:ReportableLegalEntities srt:ParentCompany75.177.577.977.175.4

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value-30672-34208-35006-33110-28393
Percentage of StockholdersEquity-237.6-234.0-236.5-235.9-249.3
Percentage of Assets-12.4-12.4-13.0-12.4-11.7
Percentage of Assets srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor94.694.995.594.594.4

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1502616806172871651914659
Percentage of StockholdersEquity116.4115.0116.8117.7128.7
Percentage of Assets6.16.16.46.26.0
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate6.16.16.46.26.0

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1564617401177181659113733
Percentage of StockholdersEquity121.2119.0119.7118.2120.6
Percentage of Assets6.36.36.66.25.7
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiaryPrincipalFinancialServicesConsolidate91.692.492.791.390.8

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1290714618148041403411390
Percentage of StockholdersEquity100.0100.0100.0100.0100.0
Percentage of Assets5.25.35.55.24.7
Percentage of Assets srt:ReportableLegalEntities srt:ParentCompany75.177.577.977.175.4

us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312012-12-31
Value-424-435-434-444-501-512-425-434-443-371-395-399-404-408-426-434-442-450-375-387-399-411-145-148-155-488
Percentage of StockholdersEquity-3.3-3.0-2.9-3.2-3.9-4.5-3.6-3.7-3.6-2.9-3.3-3.6-3.8-4.0-3.9-4.1-4.4-4.8-3.9-4.0-3.8-4.0-1.4-1.4-1.6-5.0
Percentage of Assets-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.1-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.1-0.1-0.1-0.3
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1025374615964
Percentage of StockholdersEquity0.80.40.50.40.50.6
Percentage of Assets0.00.00.00.00.00.0
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312012-12-31
Value1350280630662279129419024844791414701400133099583115601439113673298195312591202117412488781418
Percentage of StockholdersEquity10.519.220.716.210.21.72.13.87.511.411.711.99.48.114.513.711.37.910.29.812.111.811.412.09.114.5
Percentage of Assets0.51.01.10.90.50.10.10.20.40.60.60.60.40.40.70.60.50.30.50.40.60.50.50.60.40.9
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312012-12-31
Value-59910371307647-418-1565-1347-1137-46916547-116-455-67591-19-356-882-524-3262850380599183640
Percentage of StockholdersEquity-4.67.18.84.6-3.3-13.7-11.5-9.8-3.91.30.4-1.0-4.3-6.60.9-0.2-3.5-9.5-5.5-3.40.30.53.75.81.96.6
Percentage of Assets-0.20.40.50.2-0.2-0.6-0.5-0.5-0.20.10.0-0.0-0.2-0.30.0-0.0-0.2-0.4-0.2-0.10.00.00.20.30.10.4
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312012-12-31
Value-1627-1341-1353-1198-1222-1259-1166-1142-909-918-945-1031-1030-1093-1035-1019-1031-1148-1116-867-819-686-563-373-361-106
Percentage of StockholdersEquity-12.6-9.2-9.1-8.5-9.6-11.1-10.0-9.8-7.5-7.1-7.9-9.2-9.7-10.7-9.6-9.7-10.3-12.3-11.6-8.9-7.9-6.7-5.5-3.6-3.7-1.1
Percentage of Assets-0.7-0.5-0.5-0.4-0.5-0.5-0.5-0.5-0.4-0.4-0.4-0.4-0.4-0.5-0.4-0.5-0.5-0.5-0.5-0.4-0.4-0.3-0.3-0.2-0.2-0.1
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue



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
Value444444444444444444444444444444444444444
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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
Value1119811074109271080510571102901020799049598948287848112793777207528733971316875673465476420611459455816560554055249512549714940478446674548507751305066480846124160
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 Assets4.54.04.04.04.14.23.93.93.83.73.53.43.43.43.33.33.33.13.12.92.92.82.72.72.72.62.62.62.53.13.03.13.03.43.63.43.33.23.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value-8679-8825-8986-8950-8296
Percentage of RetainedEarningsAccumulatedDeficit-77.5-79.7-82.2-82.8-80.6
Percentage of Assets-3.5-3.2-3.3-3.3-3.4
Percentage of Assets srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherNotesGuarantor21.520.519.720.522.2

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value63076414651265545855
Percentage of RetainedEarningsAccumulatedDeficit56.357.959.660.756.9
Percentage of Assets2.62.32.42.42.4
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther9.48.38.28.18.1

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value23722410247423962441
Percentage of RetainedEarningsAccumulatedDeficit21.221.822.622.223.7
Percentage of Assets1.00.90.90.91.0
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceCompany1.21.11.11.11.3

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1119811074109271080510290
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0
Percentage of Assets4.54.04.04.04.2
Percentage of Assets srt:ReportableLegalEntities srt:ParentCompany65.158.757.559.368.1

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value-8937-9248-9737-9756-9266
Percentage of RetainedEarningsAccumulatedDeficit-79.8-83.5-89.1-90.3-90.1
Percentage of Assets-3.6-3.3-3.6-3.6-3.8
Percentage of Assets srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor27.625.726.627.830.8

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value27882985336833433549
Percentage of RetainedEarningsAccumulatedDeficit24.927.030.830.934.5
Percentage of Assets1.11.11.21.21.5
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate1.11.11.31.31.5

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value61496263636864125716
Percentage of RetainedEarningsAccumulatedDeficit54.956.658.359.355.6
Percentage of Assets2.52.32.42.42.4
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiaryPrincipalFinancialServicesConsolidate36.033.233.335.337.8

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1119811074109271080510290
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0
Percentage of Assets4.54.04.04.04.2
Percentage of Assets srt:ReportableLegalEntities srt:ParentCompany65.158.757.559.368.1

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
Value791376817598755475547400719071256928672967266677665165086476644163366231611860066006593059305857579757085707564556455554555454845345528151814961473147254722
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 Assets3.22.82.82.82.93.02.82.82.72.62.72.82.82.92.82.92.92.82.82.72.72.72.72.72.72.72.82.92.83.43.53.63.53.63.63.33.23.23.4

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value79137681759875547400
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0
Percentage of Assets3.22.82.82.83.0
Percentage of Assets srt:ReportableLegalEntities srt:ParentCompany46.040.740.041.549.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value79137681759875547400
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0
Percentage of Assets3.22.82.82.83.0
Percentage of Assets srt:ReportableLegalEntities srt:ParentCompany46.040.740.041.549.0

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value-59910371307647-418-1565-1347-1137-46916547-116-455-67591-19-356-882-524-3262850380599361183-170621631880550488201409698525272-1042
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-0.20.40.50.2-0.2-0.6-0.5-0.5-0.20.10.0-0.0-0.2-0.30.0-0.0-0.2-0.4-0.2-0.10.00.00.20.30.20.1-0.0-0.00.30.40.60.40.30.10.30.50.40.2-0.8

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value-645-3569-4040-26021527
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax107.7-343.9-309.2-401.9-97.6
Percentage of Assets-0.3-1.3-1.5-1.00.6
Percentage of Assets srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherNotesGuarantor1.68.38.96.0-4.1

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value-6919481158536-1583
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax115.491.488.682.8101.2
Percentage of Assets-0.30.30.40.2-0.7
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther-1.01.21.50.7-2.2

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value133626202882206655
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax-223.1252.5220.5319.1-3.6
Percentage of Assets0.50.91.10.80.0
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceCompany0.71.21.31.00.0

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value-59910371307647-1565
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0
Percentage of Assets-0.20.40.50.2-0.6
Percentage of Assets srt:ReportableLegalEntities srt:ParentCompany-3.55.56.93.6-10.4

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value186-3134-3595-22941986
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax-31.1-302.0-275.1-354.3-127.0
Percentage of Assets0.1-1.1-1.3-0.90.8
Percentage of Assets srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor-0.68.79.86.5-6.6

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value-14165418901239-903
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax2.5159.4144.6191.457.7
Percentage of Assets-0.00.60.70.5-0.4
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate-0.00.60.70.5-0.4

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value-171147917041055-1083
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax28.7142.6130.4162.969.2
Percentage of Assets-0.10.50.60.4-0.4
Percentage of Assets srt:ReportableLegalEntities pfg:SubsidiaryPrincipalFinancialServicesConsolidate-1.07.98.95.8-7.2

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value-59910371307647-1565
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0
Percentage of Assets-0.20.40.50.2-0.6
Percentage of Assets srt:ReportableLegalEntities srt:ParentCompany-3.55.56.93.6-10.4

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-03-312018-03-312017-03-31
Value15891176746522
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0
Percentage of Revenues34.931.425.917.1

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-03-31
Value-1057-861
Percentage of NetCashProvidedByUsedInOperatingActivities-66.5-73.2
Percentage of Revenues-23.2-23.0
Percentage of Revenues srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherNotesGuarantor226.4224.3

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value913634
Percentage of NetCashProvidedByUsedInOperatingActivities57.553.9
Percentage of Revenues20.116.9
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther98.468.1

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value17111376
Percentage of NetCashProvidedByUsedInOperatingActivities107.7117.0
Percentage of Revenues37.636.8
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceCompany41.943.2

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value2027
Percentage of NetCashProvidedByUsedInOperatingActivities1.32.3
Percentage of Revenues0.50.7
Percentage of Revenues srt:ReportableLegalEntities srt:ParentCompany243.0267.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-03-31
Value66137
Percentage of NetCashProvidedByUsedInOperatingActivities4.211.7
Percentage of Revenues1.53.7
Percentage of Revenues srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor-66900.0-11458.3

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value14611033
Percentage of NetCashProvidedByUsedInOperatingActivities92.087.9
Percentage of Revenues32.127.6
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate32.927.7

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-03-31
Value40-22
Percentage of NetCashProvidedByUsedInOperatingActivities2.5-1.9
Percentage of Revenues0.9-0.6
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiaryPrincipalFinancialServicesConsolidate40.1-502.3

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value2027
Percentage of NetCashProvidedByUsedInOperatingActivities1.32.3
Percentage of Revenues0.50.7
Percentage of Revenues srt:ReportableLegalEntities srt:ParentCompany243.0267.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-03-312018-03-312017-03-31
Value-912-1491-979-1831
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0
Percentage of Revenues-20.1-39.8-34.0-60.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-03-31
Value170562
Percentage of NetCashProvidedByUsedInInvestingActivities-18.7-37.7
Percentage of Revenues3.815.0
Percentage of Revenues srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherNotesGuarantor-36.6-146.3

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value-583-668
Percentage of NetCashProvidedByUsedInInvestingActivities63.944.8
Percentage of Revenues-12.8-17.8
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther-62.8-71.7

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value-914-1590
Percentage of NetCashProvidedByUsedInInvestingActivities100.2106.7
Percentage of Revenues-20.1-42.5
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceCompany-22.4-49.9

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value413205
Percentage of NetCashProvidedByUsedInInvestingActivities-45.3-13.8
Percentage of Revenues9.15.5
Percentage of Revenues srt:ReportableLegalEntities srt:ParentCompany4812.81998.1

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-03-31
Value-870-260
Percentage of NetCashProvidedByUsedInInvestingActivities95.417.5
Percentage of Revenues-19.1-6.9
Percentage of Revenues srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor870700.021683.3

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value-921-1451
Percentage of NetCashProvidedByUsedInInvestingActivities101.097.4
Percentage of Revenues-20.3-38.8
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate-20.7-38.9

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-03-31
Value46514
Percentage of NetCashProvidedByUsedInInvestingActivities-51.0-1.0
Percentage of Revenues10.20.4
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiaryPrincipalFinancialServicesConsolidate465.3338.6

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value413205
Percentage of NetCashProvidedByUsedInInvestingActivities-45.3-13.8
Percentage of Revenues9.15.5
Percentage of Revenues srt:ReportableLegalEntities srt:ParentCompany4812.81998.1

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-03-312018-03-312017-03-31
Value290-40398123
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0
Percentage of Revenues6.4-10.83.44.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-03-31
Value849409
Percentage of NetCashProvidedByUsedInFinancingActivities292.6-101.5
Percentage of Revenues18.710.9
Percentage of Revenues srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherNotesGuarantor-181.9-106.5

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value-115-135
Percentage of NetCashProvidedByUsedInFinancingActivities-39.833.7
Percentage of Revenues-2.5-3.6
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther-12.5-14.6

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value-67-378
Percentage of NetCashProvidedByUsedInFinancingActivities-23.193.9
Percentage of Revenues-1.5-10.1
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceCompany-1.6-11.9

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value-376-298
Percentage of NetCashProvidedByUsedInFinancingActivities-129.673.9
Percentage of Revenues-8.3-8.0
Percentage of Revenues srt:ReportableLegalEntities srt:ParentCompany-4376.7-2893.2

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-03-31
Value894304
Percentage of NetCashProvidedByUsedInFinancingActivities308.0-75.6
Percentage of Revenues19.78.1
Percentage of Revenues srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor-894400.0-25391.7

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value213-194
Percentage of NetCashProvidedByUsedInFinancingActivities73.448.2
Percentage of Revenues4.7-5.2
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate4.8-5.2

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-03-31
Value-440-215
Percentage of NetCashProvidedByUsedInFinancingActivities-151.853.5
Percentage of Revenues-9.7-5.8
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiaryPrincipalFinancialServicesConsolidate-440.3-4902.3

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value-376-298
Percentage of NetCashProvidedByUsedInFinancingActivities-129.673.9
Percentage of Revenues-8.3-8.0
Percentage of Revenues srt:ReportableLegalEntities srt:ParentCompany-4376.7-2893.2

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-03-312018-03-312017-03-31
Value15891176746522
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0
Percentage of Revenues34.931.425.917.1

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-03-31
Value-1057-861
Percentage of NetCashProvidedByUsedInOperatingActivities-66.5-73.2
Percentage of Revenues-23.2-23.0
Percentage of Revenues srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherNotesGuarantor226.4224.3

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value913634
Percentage of NetCashProvidedByUsedInOperatingActivities57.553.9
Percentage of Revenues20.116.9
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther98.468.1

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value17111376
Percentage of NetCashProvidedByUsedInOperatingActivities107.7117.0
Percentage of Revenues37.636.8
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceCompany41.943.2

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value2027
Percentage of NetCashProvidedByUsedInOperatingActivities1.32.3
Percentage of Revenues0.50.7
Percentage of Revenues srt:ReportableLegalEntities srt:ParentCompany243.0267.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-03-31
Value66137
Percentage of NetCashProvidedByUsedInOperatingActivities4.211.7
Percentage of Revenues1.53.7
Percentage of Revenues srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor-66900.0-11458.3

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value14611033
Percentage of NetCashProvidedByUsedInOperatingActivities92.087.9
Percentage of Revenues32.127.6
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate32.927.7

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-03-31
Value40-22
Percentage of NetCashProvidedByUsedInOperatingActivities2.5-1.9
Percentage of Revenues0.9-0.6
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiaryPrincipalFinancialServicesConsolidate40.1-502.3

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value2027
Percentage of NetCashProvidedByUsedInOperatingActivities1.32.3
Percentage of Revenues0.50.7
Percentage of Revenues srt:ReportableLegalEntities srt:ParentCompany243.0267.0

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value28830027738642923645645639784181030934830832236830025742224831430125323018622318718120971266204150142199
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues6.37.46.29.711.56.310.514.113.826.017.59.711.410.910.712.19.37.915.910.012.112.211.310.48.69.76.98.610.03.411.49.26.66.48.8

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-03-31
Value-686-758
Percentage of NetIncomeLoss-237.5-176.4
Percentage of Revenues-15.1-20.3
Percentage of Revenues srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherNotesGuarantor146.9197.3

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value316462
Percentage of NetIncomeLoss109.6107.7
Percentage of Revenues7.012.4
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther34.149.7

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value369295
Percentage of NetIncomeLoss127.968.7
Percentage of Revenues8.17.9
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceCompany9.19.3

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value288429
Percentage of NetIncomeLoss100.0100.0
Percentage of Revenues6.311.5
Percentage of Revenues srt:ReportableLegalEntities srt:ParentCompany3359.34173.8

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-03-31
Value-651-945
Percentage of NetIncomeLoss-225.5-219.9
Percentage of Revenues-14.3-25.3
Percentage of Revenues srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor651500.078783.3

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value334482
Percentage of NetIncomeLoss115.9112.2
Percentage of Revenues7.412.9
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate7.512.9

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-03-31
Value316462
Percentage of NetIncomeLoss109.6107.7
Percentage of Revenues7.012.4
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiaryPrincipalFinancialServicesConsolidate316.310520.5

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value288429
Percentage of NetIncomeLoss100.0100.0
Percentage of Revenues6.311.5
Percentage of Revenues srt:ReportableLegalEntities srt:ParentCompany3359.34173.8

Profit Loss

us-gaap:ProfitLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value28531528439245223146045940284281331435333832732736925830026442928025231932425025923619023019118421817166289223218151144203154204164122
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-03-31
Value-686-755
Percentage of ProfitLoss-240.8-167.2

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value312482
Percentage of ProfitLoss109.7106.8

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value369295
Percentage of ProfitLoss129.765.3

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value288429
Percentage of ProfitLoss101.495.1

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-03-31
Value-651-945
Percentage of ProfitLoss-228.6-209.1

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value331504
Percentage of ProfitLoss116.1111.6

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-03-31
Value316462
Percentage of ProfitLoss111.1102.4

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value288429
Percentage of ProfitLoss101.495.1

Increase Decrease In Other Operating Capital Net

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-03-312018-03-312017-03-31
Value-912-1491-979-1831
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0
Percentage of Revenues-20.1-39.8-34.0-60.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-03-31
Value170562
Percentage of NetCashProvidedByUsedInInvestingActivities-18.7-37.7
Percentage of Revenues3.815.0
Percentage of Revenues srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherNotesGuarantor-36.6-146.3

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value-583-668
Percentage of NetCashProvidedByUsedInInvestingActivities63.944.8
Percentage of Revenues-12.8-17.8
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther-62.8-71.7

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value-914-1590
Percentage of NetCashProvidedByUsedInInvestingActivities100.2106.7
Percentage of Revenues-20.1-42.5
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceCompany-22.4-49.9

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value413205
Percentage of NetCashProvidedByUsedInInvestingActivities-45.3-13.8
Percentage of Revenues9.15.5
Percentage of Revenues srt:ReportableLegalEntities srt:ParentCompany4812.81998.1

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-03-31
Value-870-260
Percentage of NetCashProvidedByUsedInInvestingActivities95.417.5
Percentage of Revenues-19.1-6.9
Percentage of Revenues srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor870700.021683.3

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value-921-1451
Percentage of NetCashProvidedByUsedInInvestingActivities101.097.4
Percentage of Revenues-20.3-38.8
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate-20.7-38.9

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-03-31
Value46514
Percentage of NetCashProvidedByUsedInInvestingActivities-51.0-1.0
Percentage of Revenues10.20.4
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiaryPrincipalFinancialServicesConsolidate465.3338.6

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value413205
Percentage of NetCashProvidedByUsedInInvestingActivities-45.3-13.8
Percentage of Revenues9.15.5
Percentage of Revenues srt:ReportableLegalEntities srt:ParentCompany4812.81998.1

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-03-312018-03-312017-03-31
Value290-40398123
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0
Percentage of Revenues6.4-10.83.44.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-03-31
Value849409
Percentage of NetCashProvidedByUsedInFinancingActivities292.6-101.5
Percentage of Revenues18.710.9
Percentage of Revenues srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherNotesGuarantor-181.9-106.5

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value-115-135
Percentage of NetCashProvidedByUsedInFinancingActivities-39.833.7
Percentage of Revenues-2.5-3.6
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther-12.5-14.6

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value-67-378
Percentage of NetCashProvidedByUsedInFinancingActivities-23.193.9
Percentage of Revenues-1.5-10.1
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceCompany-1.6-11.9

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value-376-298
Percentage of NetCashProvidedByUsedInFinancingActivities-129.673.9
Percentage of Revenues-8.3-8.0
Percentage of Revenues srt:ReportableLegalEntities srt:ParentCompany-4376.7-2893.2

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-03-31
Value894304
Percentage of NetCashProvidedByUsedInFinancingActivities308.0-75.6
Percentage of Revenues19.78.1
Percentage of Revenues srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor-894400.0-25391.7

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value213-194
Percentage of NetCashProvidedByUsedInFinancingActivities73.448.2
Percentage of Revenues4.7-5.2
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate4.8-5.2

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-03-31
Value-440-215
Percentage of NetCashProvidedByUsedInFinancingActivities-151.853.5
Percentage of Revenues-9.7-5.8
Percentage of Revenues srt:ReportableLegalEntities pfg:SubsidiaryPrincipalFinancialServicesConsolidate-440.3-4902.3

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value-376-298
Percentage of NetCashProvidedByUsedInFinancingActivities-129.673.9
Percentage of Revenues-8.3-8.0
Percentage of Revenues srt:ReportableLegalEntities srt:ParentCompany-4376.7-2893.2

Proceeds From Issuance Of Long Term Debt

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

us-gaap:ProceedsFromIssuanceOfLongTermDebt

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-03-31
Value-2-2
Percentage of ProceedsFromIssuanceOfLongTermDebt100.0100.0

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-03-31
Value22
Percentage of ProceedsFromIssuanceOfLongTermDebt-100.0-100.0

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt



Period End2020-03-312019-03-312018-03-312015-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value6400191000013
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-03-31
Value-1-5
Percentage of RepaymentsOfLongTermDebt-2.0-1933.3
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherNotesGuarantor0.00.0

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value656
Percentage of RepaymentsOfLongTermDebt102.02033.3
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther0.00.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-03-31
Value-9-9
Percentage of RepaymentsOfLongTermDebt-14.1-3133.3
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor0.00.0

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value640
Percentage of RepaymentsOfLongTermDebt100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate0.00.0

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-03-31
Value99
Percentage of RepaymentsOfLongTermDebt14.13133.3
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations srt:ReportableLegalEntities pfg:SubsidiaryPrincipalFinancialServicesConsolidate0.00.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock



Period End2020-03-312019-03-312018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value2311531991421057589906451
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value231153
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value231153
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt



Period End2020-03-312019-03-312018-03-312015-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value6400191000013
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-03-31
Value-1-5
Percentage of RepaymentsOfLongTermDebt-2.0-1933.3
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherNotesGuarantor0.00.0

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value656
Percentage of RepaymentsOfLongTermDebt102.02033.3
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations srt:ReportableLegalEntities pfg:SubsidiariesPrincipalFinancialServicesAndOther0.00.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-03-31
Value-9-9
Percentage of RepaymentsOfLongTermDebt-14.1-3133.3
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations srt:ConsolidationEliminations pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor0.00.0

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value640
Percentage of RepaymentsOfLongTermDebt100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations srt:ReportableLegalEntities pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate0.00.0

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-03-31
Value99
Percentage of RepaymentsOfLongTermDebt14.13133.3
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations srt:ReportableLegalEntities pfg:SubsidiaryPrincipalFinancialServicesConsolidate0.00.0

Debt Instrument Interest Rate Stated Percentage

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-31
Value0.130.180.130.140.190.110.120.30.140.150.120.180.16
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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:PerformanceShares



Period End2020-03-312019-03-312018-03-312017-03-312016-03-312015-03-312014-03-312013-03-31
Value300000.0200000.0200000.0200000.0300000.0300000.0300000.0300000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedStockUnitsRSU



Period End2020-03-312019-03-312018-03-312017-03-312016-03-312015-03-312014-03-312013-03-31
Value11001001
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod333.3500.0400.0400.0400.0266.7300.0400.0

Share Based Compensation

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

Cash And Cash Equivalents Period Increase Decrease

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value3482251531983315225929772926234224702719
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value-861-824-680-863-586-696-447-300-325-920
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents-24.7-32.8-21.3-26.0-26.0-23.4-15.3-12.8-13.2-33.9

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value1982176717682758184520141752155815262082
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents56.970.355.383.281.767.759.966.561.876.6

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value19081178180880573013231311833426675
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents54.846.856.624.332.344.544.835.617.324.8

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value453394301615270334310250842882
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents13.015.79.418.612.011.210.610.734.132.5

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value-1043-1133-1059-1268-921-1103-1123-887-990-1481
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents-29.9-45.1-33.1-38.2-40.8-37.1-38.4-37.9-40.1-54.5

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value3408265633642365248430963033244820012114
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents97.9105.6105.271.3110.0104.0103.6104.681.077.8

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value66359859216034266497065306171203
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents19.123.818.548.318.921.824.122.625.044.2

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value453394301615270334310250842882
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents13.015.79.418.612.011.210.610.734.132.5

Proceeds From Repayments Of Short Term Debt

us-gaap:ProceedsFromRepaymentsOfShortTermDebt



Period End2020-03-312019-03-312018-03-312017-03-312016-03-312015-03-312014-03-312012-03-312011-03-312010-03-31
Value240387-5900-7031
Percentage of ProceedsFromRepaymentsOfShortTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value240
Percentage of ProceedsFromRepaymentsOfShortTermDebt100.0100.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value240
Percentage of ProceedsFromRepaymentsOfShortTermDebt100.0100.0

us-gaap:StatementEquityComponents

pfg:AdjustmentsForAssumedChangesInAmortizationPatternsBeforeTax

us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-31
Value000-1
Percentage of AdjustmentsForAssumedChangesInAmortizationPatternsBeforeTax100.0100.0100.0100.0

us-gaap:AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterest



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
Value-33260117122-12-54-860321575656-35-9513-28
Percentage of AdjustmentsForAssumedChangesInAmortizationPatternsBeforeTax-110833.360900.0-19600.0-6426.30.00.00.00.00.00.00.00.00.00.00.00.00.0

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Period End2020-03-312019-09-302019-06-302019-03-31
Value000-1
Percentage of AdjustmentsForAssumedChangesInAmortizationPatternsNetOfTax100.0100.0100.0100.0

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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
Value-262489296-9-42-680211053636-23-628-18
Percentage of AdjustmentsForAssumedChangesInAmortizationPatternsNetOfTax-87566.748200.0-18580.0-6426.70.00.00.00.00.00.00.00.00.00.00.00.00.0

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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
Value-69122425-2-11-18011521919-12-334-9
Percentage of AdjustmentsForAssumedChangesInAmortizationPatternsTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2020-03-312019-09-302019-06-302019-03-31
Value-1-1-1-3
Percentage of AdjustmentsForAssumedChangesInLiabilityForPolicyholderBenefitsAndClaimsBeforeTax100.0100.0100.0100.0

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Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-30
Value-662342462300-41-102-178236478126394293-190-526168-149290
Percentage of AdjustmentsForAssumedChangesInLiabilityForPolicyholderBenefitsAndClaimsBeforeTax55183.3-28525.0-38525.0-8341.70.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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Period End2020-03-312019-09-302019-06-302019-03-31
Value-1-1-1-2
Percentage of AdjustmentsForAssumedChangesInLiabilityForPolicyholderBenefitsAndClaimsNetOfTax100.0100.0100.0100.0

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Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-30
Value-510257353230-32-89-13314415489261194-126-345110-102196
Percentage of AdjustmentsForAssumedChangesInLiabilityForPolicyholderBenefitsAndClaimsNetOfTax51000.0-25780.0-35370.0-8548.10.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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Period End2020-03-312019-09-302019-06-302019-03-31
Value-200000.0-200000.0-200000.0-900000.0
Percentage of AdjustmentsForAssumedChangesInLiabilityForPolicyholderBenefitsAndClaimsTax100.0100.0100.0100.0

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Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-30
Value-1528410869-9-12-45823243713299-64-18058-4793
Percentage of AdjustmentsForAssumedChangesInLiabilityForPolicyholderBenefitsAndClaimsTax76100.0-42250.0-54300.0-7722.20.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-03-312015-03-312014-03-31
Value000-220003-3-34
Percentage of AdjustmentsToRedemptionAmountOfRedeemableNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-31
Value001-22003-3-24
Percentage of AdjustmentsToRedemptionAmountOfRedeemableNoncontrollingInterest75.0100.0125.0100.0100.0100.0100.0100.0100.071.7

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Period End2020-03-312019-06-302018-06-30
Value-100000.0-200000.0-300000.0
Percentage of AdjustmentsToRedemptionAmountOfRedeemableNoncontrollingInterest25.0-25.0100.0

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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
Value-4330158178-101111171717-27-122-48630466-57-938002
Percentage of CapitalGainsLossesDistributed100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2020-03-312019-03-31
Value848403
Percentage of CapitalReceivedFromDividendsPaidToParent100.0100.0

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value-434-209
Percentage of CapitalReceivedFromDividendsPaidToParent-51.2-51.9

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value-413-193
Percentage of CapitalReceivedFromDividendsPaidToParent-48.8-48.1

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srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-03-31
Value887297
Percentage of CapitalReceivedFromDividendsPaidToParent104.673.8

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value-453-89
Percentage of CapitalReceivedFromDividendsPaidToParent-53.5-22.1

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-03-31
Value-433-208
Percentage of CapitalReceivedFromDividendsPaidToParent-51.1-51.8

pfg:ContributionsToRedeemableNoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-03-312015-03-31
Value347515414332173942210
Percentage of ContributionsToRedeemableNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2020-03-31
Value-8
Percentage of CumulativeEffectOfProspectiveApplicationOfNewAccountingPrincipleNetOfTax100.0

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us-gaap:AccountingStandardsUpdate201613, pfg:AccumulatedNoncreditOtherThanTemporaryImpairment



Period End2020-03-31
Value44
Percentage of CumulativeEffectOfProspectiveApplicationOfNewAccountingPrincipleNetOfTax-525.0

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Period End2020-03-31
Value-44
Percentage of CumulativeEffectOfProspectiveApplicationOfNewAccountingPrincipleNetOfTax525.0

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Period End2020-03-31
Value-8
Percentage of CumulativeEffectOfProspectiveApplicationOfNewAccountingPrincipleNetOfTax100.0

pfg:DeferredAcquisitionCostAndOtherActuarialBalancesAmortizationExpense



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value219342916-5-1-5-23-9-98074628-16163139-26-15-3-3028-32
Percentage of DeferredAcquisitionCostAndOtherActuarialBalancesAmortizationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-30
Value1317211115141710161724262434261921222125212422222325252220
Percentage of DerivativeAndHedgingRelatedAdjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-31
Value29102520959917240
Percentage of DistributionsToRedeemableNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2020-03-312019-03-31
Value-848-403
Percentage of DividendsReceivedFromContributionsToUnconsolidatedEntities100.0100.0

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Period End2020-03-312019-03-31
Value413193
Percentage of DividendsReceivedFromContributionsToUnconsolidatedEntities-48.8-48.1

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Period End2020-03-312019-03-31
Value433208
Percentage of DividendsReceivedFromContributionsToUnconsolidatedEntities-51.1-51.8

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srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-03-31
Value-887-297
Percentage of DividendsReceivedFromContributionsToUnconsolidatedEntities104.673.8

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Period End2020-03-312019-03-31
Value45389
Percentage of DividendsReceivedFromContributionsToUnconsolidatedEntities-53.5-22.1

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Period End2020-03-312019-03-31
Value433208
Percentage of DividendsReceivedFromContributionsToUnconsolidatedEntities-51.1-51.8

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Period End2020-03-312019-09-302019-03-312018-09-302017-09-302016-09-30
Value0.020.050.010.03-0.01-0.02
Percentage of EffectiveIncomeTaxRateReconciliationLocalCountryPermanentTaxAdjustmentsPercent100.0100.0100.0100.0100.0100.0

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Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-31
Value-51100-40100000
Percentage of EquityMethodInvestmentsRelatedAdjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2020-03-31
Value124
Percentage of FairValueAssetsLevel2ToLevel3TransfersAmount100.0

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Period End2020-03-312019-06-302018-09-302018-06-302018-03-312017-09-30
Value170334212361
Percentage of FairValueAssetsLevel2ToLevel3TransfersAmount137.00.00.00.00.00.0

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Period End2020-03-31
Value46
Percentage of FairValueAssetsLevel2ToLevel3TransfersAmount37.0

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pfg:FairValueAssetsLevel3ToLevel2TransfersAmount

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Period End2020-03-31
Value147
Percentage of FairValueAssetsLevel3ToLevel2TransfersAmount100.0

us-gaap:CorporateDebtSecurities, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-31
Value46
Percentage of FairValueAssetsLevel3ToLevel2TransfersAmount31.4

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Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value2367226127524877
Percentage of FairValueAssetsLevel3ToLevel2TransfersAmount160.30.00.00.00.00.00.00.0

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Period End2020-03-312019-09-302019-03-312018-09-30
Value4272648
Percentage of FairValueAssetsLevel3ToLevel2TransfersAmount28.90.00.00.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency

pfg:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsRelatingToPositionsStillHeld

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Period End2020-03-312019-06-302019-03-312018-06-302018-03-312017-09-30
Value002010
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsRelatingToPositionsStillHeld100.0100.0100.0100.0100.0100.0

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Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value126188126180304257143183
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsRelatingToPositionsStillHeld-126400.00.0126400.08213.60.085966.79560.0-61033.3

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pfg:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncome

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Period End2020-03-31
Value-2
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncome100.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentSecondaryCategorization

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Period End2020-03-31
Value-22
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncome762.1

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Period End2020-03-31
Value1
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncome-51.7

us-gaap:CorporateDebtSecurities, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-31
Value-16
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncome562.1

us-gaap:DebtSecurities, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-31
Value-40
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncome1379.3

us-gaap:OtherDebtSecurities, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-31
Value-3
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncome106.9

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Period End2020-03-312019-09-302019-03-312018-09-30
Value6241-1
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisIssuesNet100.0100.0100.0100.0

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Period End2020-03-312019-09-302019-03-312018-09-30
Value-354-1805121
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitiesGainLossIncludedInEarningsRelatingToPositionsStillHeld100.0100.0100.0100.0

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Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value-1111-1-5-12
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetDerivativeAssetsGainLossIncludedInEarningsRelatingToPositionsStillHeld100.0100.0100.0100.0100.0100.0

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Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value429532415409400399410403387
Percentage of FeesAndOtherRevenuesNotWithinScopeOfRevenueRecognitionGuidance100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value-76-75-77-70-84-78-78-80-74
Percentage of FeesAndOtherRevenuesNotWithinScopeOfRevenueRecognitionGuidance-17.7-14.1-18.8-17.3-21.1-19.7-19.2-20.0-19.2

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Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value55104876610
Percentage of FeesAndOtherRevenuesNotWithinScopeOfRevenueRecognitionGuidance1.31.02.51.12.11.81.61.72.6

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Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value111111211
Percentage of FeesAndOtherRevenuesNotWithinScopeOfRevenueRecognitionGuidance0.30.30.40.40.40.50.50.40.4

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Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value280301281271288282286282271
Percentage of FeesAndOtherRevenuesNotWithinScopeOfRevenueRecognitionGuidance65.456.667.866.472.170.969.870.170.1

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Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value324432234
Percentage of FeesAndOtherRevenuesNotWithinScopeOfRevenueRecognitionGuidance0.70.51.01.20.80.70.71.01.1

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Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302017-09-302017-06-30
Value210292190192177177183168
Percentage of FeesAndOtherRevenuesNotWithinScopeOfRevenueRecognitionGuidance48.954.945.847.044.344.545.543.6

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Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302017-09-302017-06-30
Value44445555
Percentage of FeesAndOtherRevenuesNotWithinScopeOfRevenueRecognitionGuidance1.10.91.21.21.31.31.31.4

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Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-03-312016-09-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value1554300-1000000000000000000-1130
Percentage of FrontEndFeeRevenuesRecognition100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

pfg:IncomeLossFromContinuingOperationsBeforeIncomeTaxes



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value3283454505265695154571157365414370399439369294458393407376320265228260181235277138372283163157256
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-03-31
Value-370-294
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxes-112.8-55.9

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value121239
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxes37.145.6

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value616626
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxes187.8119.0

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value-39-45
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxes-12.2-8.7

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-03-31
Value21
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxes0.60.3

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value399588
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxes121.7111.9

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-03-31
Value-33-18
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxes-10.2-3.5

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value-39-45
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxes-12.2-8.7

us-gaap:StatementBusinessSegments

pfg:InterSegmentRevenue

pfg:SegmentPrincipalGlobalInvestors



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
Value72676661696762686059595754525360
Percentage of InterSegmentRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

pfg:SegmentRetirementAndIncomeSolutions



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
Value84928885103981011039795969289104112105
Percentage of InterSegmentRevenue115.5136.6133.7139.3150.1145.9163.5152.1161.4158.8161.8162.5164.3198.1210.8174.2

pfg:InvestmentAdvisoryAssetManagementAndInsuranceFeesAndCommissions



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value114512301006973126110121011987
Percentage of InvestmentAdvisoryAssetManagementAndInsuranceFeesAndCommissions100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-03-31
Value-100-91
Percentage of InvestmentAdvisoryAssetManagementAndInsuranceFeesAndCommissions-8.7-9.4

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value661520
Percentage of InvestmentAdvisoryAssetManagementAndInsuranceFeesAndCommissions57.753.5

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value584544
Percentage of InvestmentAdvisoryAssetManagementAndInsuranceFeesAndCommissions51.055.9

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-03-31
Value-2-3
Percentage of InvestmentAdvisoryAssetManagementAndInsuranceFeesAndCommissions-0.2-0.3

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value1052976
Percentage of InvestmentAdvisoryAssetManagementAndInsuranceFeesAndCommissions91.9100.3

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-03-31
Value950
Percentage of InvestmentAdvisoryAssetManagementAndInsuranceFeesAndCommissions8.40.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, pfg:SegmentCorporate



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-43-35-35-33-44-41-34-43
Percentage of InvestmentAdvisoryAssetManagementAndInsuranceFeesAndCommissions-3.8-2.9-3.5-3.5-3.5-4.1-3.4-4.4

us-gaap:OperatingSegments, pfg:SegmentPrincipalGlobalInvestors



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value388367356336631378367366
Percentage of InvestmentAdvisoryAssetManagementAndInsuranceFeesAndCommissions33.929.935.434.650.137.436.337.1

us-gaap:OperatingSegments, pfg:SegmentPrincipalInternational



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value110116117116119124123110
Percentage of InvestmentAdvisoryAssetManagementAndInsuranceFeesAndCommissions9.79.511.712.09.512.312.211.2

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments

us-gaap:OperatingSegments, pfg:SegmentRetirementAndIncomeSolutions, pfg:SubsegmentRetirementAndIncomeSolutionsFee



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value436457345330352349348345
Percentage of InvestmentAdvisoryAssetManagementAndInsuranceFeesAndCommissions38.137.234.333.927.934.534.435.0

us-gaap:OperatingSegments, pfg:SegmentRetirementAndIncomeSolutions, pfg:SubsegmentRetirementAndIncomeSolutionsSpread



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value54676556
Percentage of InvestmentAdvisoryAssetManagementAndInsuranceFeesAndCommissions0.50.40.60.80.50.60.50.6

us-gaap:OperatingSegments, pfg:SegmentUSInsuranceSolutions, pfg:SubsegmentIndividualLifeInsurance



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302017-09-30
Value222304202204188187192
Percentage of InvestmentAdvisoryAssetManagementAndInsuranceFeesAndCommissions19.524.820.221.014.918.519.5

us-gaap:OperatingSegments, pfg:SegmentUSInsuranceSolutions, pfg:SubsegmentSpecialtyBenefitsInsurance



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302017-09-30
Value8888898
Percentage of InvestmentAdvisoryAssetManagementAndInsuranceFeesAndCommissions0.80.70.80.90.70.90.9

pfg:MarketValueAdjustmentsEmbeddedDerivatives



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value-23518745240114602-1050018000-10603032
Percentage of MarketValueAdjustmentsEmbeddedDerivatives100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

pfg:MinorityInterestIncreaseFromContributionsFromNoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-31
Value23100100017113
Percentage of MinorityInterestIncreaseFromContributionsFromNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-31
Value23100100017113
Percentage of MinorityInterestIncreaseFromContributionsFromNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

pfg:NetGainLossExcludingAvailableForSaleImpairments



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value131-311391-176-15693-8112554318446-10873-2410919-29-53-265612232221688-528-1133
Percentage of NetGainLossExcludingAvailableForSaleImpairments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-31
Value-1
Percentage of NetGainLossExcludingAvailableForSaleImpairments-1.0

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value-501-317
Percentage of NetGainLossExcludingAvailableForSaleImpairments-381.6-347.8

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value628403
Percentage of NetGainLossExcludingAvailableForSaleImpairments478.6441.9

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value55
Percentage of NetGainLossExcludingAvailableForSaleImpairments4.05.8

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value12079
Percentage of NetGainLossExcludingAvailableForSaleImpairments92.087.0

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-03-31
Value56
Percentage of NetGainLossExcludingAvailableForSaleImpairments4.07.2

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value55
Percentage of NetGainLossExcludingAvailableForSaleImpairments4.05.8

pfg:OperatingExpensesIncludingDeferredAcquisitionCostsCapitalizationAndAmortization



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value1335124210469921105990985932928943919927899961869921932886829774801795832826724556766903691751683675
Percentage of OperatingExpensesIncludingDeferredAcquisitionCostsCapitalizationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-03-31
Value-94-87
Percentage of OperatingExpensesIncludingDeferredAcquisitionCostsCapitalizationAndAmortization-7.0-8.8

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value578438
Percentage of OperatingExpensesIncludingDeferredAcquisitionCostsCapitalizationAndAmortization43.344.1

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value802585
Percentage of OperatingExpensesIncludingDeferredAcquisitionCostsCapitalizationAndAmortization60.159.0

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value4856
Percentage of OperatingExpensesIncludingDeferredAcquisitionCostsCapitalizationAndAmortization3.65.7

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-03-31
Value-2-2
Percentage of OperatingExpensesIncludingDeferredAcquisitionCostsCapitalizationAndAmortization-0.2-0.3

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value1155916
Percentage of OperatingExpensesIncludingDeferredAcquisitionCostsCapitalizationAndAmortization86.592.3

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-03-31
Value13322
Percentage of OperatingExpensesIncludingDeferredAcquisitionCostsCapitalizationAndAmortization10.02.3

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value4856
Percentage of OperatingExpensesIncludingDeferredAcquisitionCostsCapitalizationAndAmortization3.65.7

us-gaap:ConsolidationItems

pfg:OperatingRevenues

us-gaap:OperatingSegments



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-31
Value4429452340023680436632062947397833093104281430352937323534062544255225422499231523112238
Percentage of OperatingRevenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, pfg:SegmentCorporate



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-31
Value9-16-151-21-17-20-19-1-21-17-13-69-63-59-61-64-37-52-53-43
Percentage of OperatingRevenues0.2-0.4-0.40.0-0.5-0.5-0.5-0.6-0.0-0.7-0.6-0.4-2.1-1.8-2.3-2.4-2.5-1.5-2.3-2.3-1.9

us-gaap:OperatingSegments, pfg:SegmentPrincipalGlobalInvestors



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-31
Value390369359339632379368367355345346351309182188186173173171160168153
Percentage of OperatingRevenues8.88.29.09.214.511.812.59.210.711.112.311.610.55.65.57.36.86.86.86.97.36.9

us-gaap:OperatingSegments, pfg:SegmentPrincipalInternational



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-31
Value300404411380287389383274319321334318286311315236294357300303275247
Percentage of OperatingRevenues6.88.910.310.36.612.213.06.99.710.311.910.59.89.69.29.311.514.112.013.111.911.1

us-gaap:OperatingSegments, pfg:SegmentRetirementAndIncomeSolutions



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
Value2605257321591891243814501182237016831482124414741464175819051124
Percentage of OperatingRevenues58.856.954.051.455.845.240.159.650.947.844.248.649.854.355.944.2

us-gaap:OperatingSegments, pfg:SegmentUSInsuranceSolutions



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-31
Value1123119210871068102910031013985970956910908890853857861821811804767773778
Percentage of OperatingRevenues25.426.427.229.023.631.334.424.829.330.832.329.930.326.425.233.932.231.932.233.133.434.8

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments

us-gaap:OperatingSegments, pfg:SegmentRetirementAndIncomeSolutions, pfg:SubsegmentRetirementAndIncomeSolutionsFee



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value543559450430469456459455451450
Percentage of OperatingRevenues12.312.411.311.710.714.215.611.413.614.5

us-gaap:OperatingSegments, pfg:SegmentRetirementAndIncomeSolutions, pfg:SubsegmentRetirementAndIncomeSolutionsSpread



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value20622013170914611969994722191512321032
Percentage of OperatingRevenues46.644.542.739.745.131.024.548.137.233.2

us-gaap:OperatingSegments, pfg:SegmentUSInsuranceSolutions, pfg:SubsegmentIndividualLifeInsurance



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value484562461466436430447435433427
Percentage of OperatingRevenues10.912.411.512.710.013.415.210.913.113.8

us-gaap:OperatingSegments, pfg:SegmentUSInsuranceSolutions, pfg:SubsegmentSpecialtyBenefitsInsurance



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value639629625601592572566550537528
Percentage of OperatingRevenues14.413.915.616.413.617.919.213.816.217.0

pfg:OtherComprehensiveIncomeAvailableForSaleSecuritiesPeriodIncreaseDecreaseNetOfTax



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value-14117879841104-199-466-8057033516312030340428-30657-7317819229-453-992961001617146175
Percentage of OtherComprehensiveIncomeAvailableForSaleSecuritiesPeriodIncreaseDecreaseNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

pfg:OtherComprehensiveIncomeDerivativesPeriodIncreaseDecreaseNetOfTax



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value48121-4220-14-11-6-12311110-16272949-25022-1848-332-8-4
Percentage of OtherComprehensiveIncomeDerivativesPeriodIncreaseDecreaseNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

pfg:OtherComprehensiveIncomeLossAttributableToRedeemableNoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-31
Value-6-1500-1002-71-10
Percentage of OtherComprehensiveIncomeLossAttributableToRedeemableNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

pfg:OtherComprehensiveIncomeLossNetOfTaxExcludingRedeemableNoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-31
Value-163965710661146-208-670-736220537-14175-19224
Percentage of OtherComprehensiveIncomeLossNetOfTaxExcludingRedeemableNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-31
Value-163765910661146-208-668-737220535-15178-19224
Percentage of OtherComprehensiveIncomeLossNetOfTaxExcludingRedeemableNoncontrollingInterest99.8100.3100.0100.099.999.7100.199.899.7109.7102.199.5100.0

us-gaap:NoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-31
Value-2-1000-10011-300
Percentage of OtherComprehensiveIncomeLossNetOfTaxExcludingRedeemableNoncontrollingInterest0.2-0.30.00.00.10.3-0.10.20.3-9.7-2.10.50.0

pfg:PaymentsToAcquirePropertyPlantAndEquipmentNet



Period End2020-03-312019-03-312018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value18292643443249-61744
Percentage of PaymentsToAcquirePropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value417
Percentage of PaymentsToAcquirePropertyPlantAndEquipmentNet22.258.8

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value1412
Percentage of PaymentsToAcquirePropertyPlantAndEquipmentNet77.841.2

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value1728
Percentage of PaymentsToAcquirePropertyPlantAndEquipmentNet96.798.3

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-03-31
Value600000.0500000.0
Percentage of PaymentsToAcquirePropertyPlantAndEquipmentNet3.31.7

us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:IncomeStatementLocation

pfg:PeriodicSettlementOnDerivatives

us-gaap:ForeignExchangeContract, us-gaap:CashFlowHedging, pfg:NetInvestmentIncomeLoss



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value2211111
Percentage of PeriodicSettlementOnDerivatives100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestRateContract, us-gaap:FairValueHedging, pfg:NetInvestmentIncomeLoss



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-1000-1-1-2
Percentage of PeriodicSettlementOnDerivatives-52.4-45.0-41.2-50.0-80.0-113.3-125.0

us-gaap:ConsolidationItems

pfg:PreTaxOtherAdjustmentsInReconcilingSegmentRevenuesToConsolidatedIncome

us-gaap:MaterialReconcilingItems



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-31
Value1554300-10
Percentage of PreTaxOtherAdjustmentsInReconcilingSegmentRevenuesToConsolidatedIncome100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

pfg:PretaxOperatingEarnings

us-gaap:OperatingSegments



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
Value386419513478593485496452494472416431356398429420
Percentage of PretaxOperatingEarnings100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, pfg:SegmentCorporate



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
Value-91-102-98-84-32-49-42-43-47-58-57-54-53-54-46-37
Percentage of PretaxOperatingEarnings-23.6-24.3-19.1-17.6-5.5-10.2-8.5-9.5-9.6-12.4-13.9-12.6-15.0-13.5-10.8-8.9

us-gaap:OperatingSegments, pfg:SegmentPrincipalGlobalInvestors



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
Value11112311510021512711013011510011211779959892
Percentage of PretaxOperatingEarnings28.929.322.521.036.326.122.228.723.321.227.127.222.423.922.922.0

us-gaap:OperatingSegments, pfg:SegmentPrincipalInternational



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
Value30108931113282877278100846968517280
Percentage of PretaxOperatingEarnings8.026.018.223.25.516.917.516.015.921.320.216.219.112.816.819.2

us-gaap:OperatingSegments, pfg:SegmentRetirementAndIncomeSolutions



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
Value205169256240259216232210243244206194181133216202
Percentage of PretaxOperatingEarnings53.140.449.950.343.844.746.846.449.351.649.745.250.933.550.548.2

us-gaap:OperatingSegments, pfg:SegmentUSInsuranceSolutions



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
Value129120146110118109108831048670103801728881
Percentage of PretaxOperatingEarnings33.528.628.523.119.922.521.918.421.118.216.924.022.643.420.519.5

pfg:ProceedsFromMaturitiesRepaymentsAndCallsOfDebtSecuritiesAvailableForSaleAndEquitySecuritiesFvNi



Period End2020-03-312019-03-312018-03-31
Value198415481555
Percentage of ProceedsFromMaturitiesRepaymentsAndCallsOfDebtSecuritiesAvailableForSaleAndEquitySecuritiesFvNi100.0100.0100.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value187118
Percentage of ProceedsFromMaturitiesRepaymentsAndCallsOfDebtSecuritiesAvailableForSaleAndEquitySecuritiesFvNi9.47.6

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value17531277
Percentage of ProceedsFromMaturitiesRepaymentsAndCallsOfDebtSecuritiesAvailableForSaleAndEquitySecuritiesFvNi88.482.5

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value43153
Percentage of ProceedsFromMaturitiesRepaymentsAndCallsOfDebtSecuritiesAvailableForSaleAndEquitySecuritiesFvNi2.29.9

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value19401395
Percentage of ProceedsFromMaturitiesRepaymentsAndCallsOfDebtSecuritiesAvailableForSaleAndEquitySecuritiesFvNi97.890.1

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value43153
Percentage of ProceedsFromMaturitiesRepaymentsAndCallsOfDebtSecuritiesAvailableForSaleAndEquitySecuritiesFvNi2.29.9

pfg:ProceedsFromSaleOfDebtSecuritiesAvailableForSaleAndEquitySecuritiesFvNi



Period End2020-03-312019-03-312018-03-31
Value5823421273
Percentage of ProceedsFromSaleOfDebtSecuritiesAvailableForSaleAndEquitySecuritiesFvNi100.0100.0100.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value364237
Percentage of ProceedsFromSaleOfDebtSecuritiesAvailableForSaleAndEquitySecuritiesFvNi62.669.4

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value218104
Percentage of ProceedsFromSaleOfDebtSecuritiesAvailableForSaleAndEquitySecuritiesFvNi37.430.6

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value582342
Percentage of ProceedsFromSaleOfDebtSecuritiesAvailableForSaleAndEquitySecuritiesFvNi100.099.9

us-gaap:ConsolidationItems

pfg:SegmentReportingInformationEarningsAdjustmentsRelatedToEquityMethodInvestmentsAndNoncontrollingInterest

us-gaap:MaterialReconcilingItems



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-31
Value9-13-14-183-18-15-15-17-20-15-15-13
Percentage of SegmentReportingInformationEarningsAdjustmentsRelatedToEquityMethodInvestmentsAndNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

pfg:SegmentReportingInformationNetRealizedCapitalGainsLosses



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
Value132-46-1383-2050-42668-110-322171134-14145-6864-21-76-101-7564-21-30-5512-81-42-87-69
Percentage of SegmentReportingInformationNetRealizedCapitalGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-31
Value132-46-1383-2050-42668-110-322171134-14145-6864-21-76-101-75
Percentage of SegmentReportingInformationNetRealizedCapitalGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

pfg:SegmentReportingInformationPretaxNetRealizedCapitalGainsLossesNetOfAdjustments



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
Value-67-60-4865-2748-23720-111-38-30-1696-12-12833
Percentage of SegmentReportingInformationPretaxNetRealizedCapitalGainsLossesNetOfAdjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems



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
Value-67-60-4865-2748-23720-111-38-30-1696-12-12833
Percentage of SegmentReportingInformationPretaxNetRealizedCapitalGainsLossesNetOfAdjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

pfg:SegmentReportingInformationRevenueAdjustmentsRelatedToEquityMethodInvestments

us-gaap:MaterialReconcilingItems



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-31
Value-10-18-16-201-21-21-19-20-22-18-16-14
Percentage of SegmentReportingInformationRevenueAdjustmentsRelatedToEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PlanName

pfg:ShareBasedCompensationArrangementShareBasedPaymentAwardAmountCapitalized

pfg:StockBasedCompensationPlans



Period End2020-03-312019-03-312018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-31
Value400000.0600000.0500000.0600000.0600000.0700000.0700000.0600000.0700000.0
Percentage of ShareBasedCompensationArrangementShareBasedPaymentAwardAmountCapitalized100.0100.0100.0100.0100.0100.0100.0100.0100.0

pfg:SponsoredInvestmentFundsRelatedAdjustments



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-30
Value36682321111110
Percentage of SponsoredInvestmentFundsRelatedAdjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

pfg:StockBasedCompensation



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-31
Value2320202419192122
Percentage of StockBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-31
Value2522222621212324
Percentage of StockBasedCompensation110.3110.2109.2108.1109.8110.4110.0108.0

us-gaap:RetainedEarnings



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-31
Value-2-2-2-2-2-2-1-1
Percentage of StockBasedCompensation-10.3-10.2-9.7-8.1-10.3-10.9-7.1-8.5

us-gaap:StatementEquityComponents

pfg:TreasuryStockAcquiredRepurchaseAuthorizationAmount

us-gaap:CommonStock



Period End2020-02-292018-11-302018-05-312017-05-312016-02-292015-10-312015-02-282014-02-282013-02-282012-05-312012-02-292011-11-302011-08-31
Value900500300250400150150200150200100100200
Percentage of TreasuryStockAcquiredRepurchaseAuthorizationAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

pfg:UnrealizedGainsLossesOnEquitySecuritiesFvNiReportedInNetInvestmentIncome



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-38211822930
Percentage of UnrealizedGainsLossesOnEquitySecuritiesFvNiReportedInNetInvestmentIncome100.0100.0100.0100.0100.0100.00.0

us-gaap:AdditionsToContractHoldersFunds



Period End2020-03-312019-03-312018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value2725187217832629397612771319141916188931051
Percentage of AdditionsToContractHoldersFunds100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value129117
Percentage of AdditionsToContractHoldersFunds4.86.2

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value25961755
Percentage of AdditionsToContractHoldersFunds95.293.8

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value27251872
Percentage of AdditionsToContractHoldersFunds100.0100.0

us-gaap:BenefitsLossesAndExpenses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value422336754112352232173527377927192426292234702812263531322447262525962498287129642199259020902199210223621919194519382030252318831818186519501969193621082125207520072062202219592058
Percentage of BenefitsLossesAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-03-31
Value-96-90
Percentage of BenefitsLossesAndExpenses-2.3-2.8

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value806691
Percentage of BenefitsLossesAndExpenses19.121.5

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value34642560
Percentage of BenefitsLossesAndExpenses82.079.6

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value4856
Percentage of BenefitsLossesAndExpenses1.11.7

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-03-31
Value-2-2
Percentage of BenefitsLossesAndExpenses-0.1-0.1

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value40433141
Percentage of BenefitsLossesAndExpenses95.797.6

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-03-31
Value13322
Percentage of BenefitsLossesAndExpenses3.20.7

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value4856
Percentage of BenefitsLossesAndExpenses1.11.7

us-gaap:CapitalizedContractCostAmortization



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value6665655
Percentage of CapitalizedContractCostAmortization100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect



Period End2020-03-312019-03-31
Value966-717
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-03-31
Value-36109
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect-3.8-15.3

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value215-169
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect22.223.6

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value730-593
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect75.582.6

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value58-64
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect6.09.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-03-31
Value90182
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect9.4-25.4

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value752-612
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect77.885.3

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-03-31
Value65-222
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect6.731.1

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value58-64
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect6.09.0

us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:IncomeStatementLocation

us-gaap:ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1

us-gaap:InterestRateContract, us-gaap:FairValueHedging, pfg:NetInvestmentIncomeLoss



Period End2020-03-312019-09-302019-06-302019-03-31
Value-11-2-4-2
Percentage of ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:IncomeStatementLocation

us-gaap:ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1

us-gaap:InterestRateContract, us-gaap:FairValueHedging, pfg:NetInvestmentIncomeLoss



Period End2020-03-312019-09-302019-06-302019-03-31
Value11242
Percentage of ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:CommonStock



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value0.560.550.540.540.530.520.51
Percentage of CommonStockDividendsPerShareDeclared100.0100.0100.0100.0100.0100.0100.0

us-gaap:ComprehensiveIncomeNetOfTax



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value-134893614521576248-212-339973648569419659903103-9340629552480236-390167518243439-199400449
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value-13411223065551874-1380-26204-224210-52318
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest



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
Value-136194014641598251-212-33397865357443866690889-8440626558500241-393169522245449-223463476953370657
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-03-31
Value2107-2978
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest-154.8-186.3

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value-12991656
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest95.4103.6

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value-9151349
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest67.284.4

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value-12541571
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest92.298.3

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-03-31
Value2482-3195
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest-182.3-199.9

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value-13471633
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest99.0102.2

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-03-31
Value-12411589
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest91.299.4

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value-12541571
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest92.298.3

us-gaap:Restatement, us-gaap:AdjustmentsForNewAccountingPronouncements

us-gaap:CumulativeEffectOnRetainedEarningsNetOfTax1

srt:RestatementAdjustment, us-gaap:AccountingStandardsUpdate201613



Period End2020-01-01
Value8
Percentage of CumulativeEffectOnRetainedEarningsNetOfTax1100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded



Period End2020-03-31
Value7
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded100.0

us-gaap:FinancialInstrument

us-gaap:CollateralizedDebtObligations



Period End2020-03-31
Value100000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded1.3

us-gaap:CommercialMortgageBackedSecurities



Period End2020-03-31
Value400000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded5.3

us-gaap:CorporateDebtSecurities



Period End2020-03-31
Value7
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded92.1

us-gaap:OtherDebtSecurities



Period End2020-03-31
Value100000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded1.3

us-gaap:DebtSecuritiesAvailableForSaleRealizedGain



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value2336232042
Percentage of DebtSecuritiesAvailableForSaleRealizedGain100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleRealizedLossExcludingOtherThanTemporaryImpairment



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value4171918261
Percentage of DebtSecuritiesAvailableForSaleRealizedLossExcludingOtherThanTemporaryImpairment100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesTradingRealizedGainLoss



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-161817140-2-10-3
Percentage of DebtSecuritiesTradingRealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesTradingUnrealizedGainLoss



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-14171714-3-2-10-3
Percentage of DebtSecuritiesTradingUnrealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value-18-18-17-16-17-16-16-17-17-17-19
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value0000-3-3-3-8-8-8-5
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value-4-4-200000000
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit2100.01400.0666.7300.022.923.525.77.05.77.011.8

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value98888887668
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value3938363539393936363638
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets435.6463.9438.6427.7466.7467.9466.7514.3530.9521.7477.8

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanInterestCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value00100001111
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value2930323229292931313133
Percentage of DefinedBenefitPlanInterestCost4185.73422.23210.03644.43311.13737.53322.23110.03110.03110.01982.4

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value-8-7-7-7-11-11-11-14-14-14-10
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value2222273025242528282829
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost-268.2-292.2-363.2-390.9-220.2-218.4-221.2-191.8-196.5-195.2-274.3

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanServiceCost

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value1816161618181816161616
Percentage of DefinedBenefitPlanServiceCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:IncomeStatementLocation

us-gaap:DerivativeFairValueHedgeIncludedInEffectivenessGainLoss

us-gaap:InterestRateContract, us-gaap:FairValueHedging, pfg:NetInvestmentIncomeLoss



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value00-1-1-1-1-1
Percentage of DerivativeFairValueHedgeIncludedInEffectivenessGainLoss100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet



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
Value263-162236-339-32-95-15-11-3120454-7234-5116-6-25-45-7-513315-2354-652-91-3
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk

us-gaap:CreditRiskContract



Period End2020-03-312019-06-302019-03-312018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-30
Value2-4110-3-20714518-11
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet0.9-171.444.8-3.61.111.321.1-50.3-130.4-17.99.2-20.1

us-gaap:EquityContract



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-30
Value177-2-15-75-46-43-15-63-34-64-616839
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet67.315.2-564.3-2586.2-127.7127.6-161.7195.135.8415.5550.0-20.44.172.7

us-gaap:ForeignExchangeContract



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-30
Value-56-3754-6-248287119-427-27
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet-21.6230.5192.9158.6-17.771.893.6-87.8-7.5-71.6-81.214.113.5-49.5

us-gaap:InterestRateContract



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-30
Value5002119467-33-19-48-2-19-242973187150
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet190.1-1287.23360.72320.7-93.158.8-510.66.120.3160.0-258.9-228.891.6276.2

us-gaap:OtherContract



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-30
Value-359-187-76412252638-2954-2-112-37-97
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet-136.71141.5-2717.9162.1338.5-154.6677.7-24.830.3-353.520.5353.0-18.4-179.3

us-gaap:DividendsCommonStock



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-31
Value153153150150150148147130110106826754
Percentage of DividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-31
Value153153150150150148147130110106826754
Percentage of DividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value0.210.210.210.210.210.210.210.350.350.350.350.350.350.350.350.350.350.350.350.350.350.350.350.350.350.350.350.350.35
Percentage of EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationDeductionsDividends



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-31
Value0.050.060.040.050.030.030.040.040.120.10.110.10.09
Percentage of EffectiveIncomeTaxRateReconciliationDeductionsDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary



Period End2020-03-312019-09-302019-06-302019-03-312018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-31
Value0.010.020.010.010.010.010.010.030.040.030.030.02
Percentage of EffectiveIncomeTaxRateReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationTaxCredits



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-31
Value0.030.030.030.020.020.030.030.020.030.030.040.020.02
Percentage of EffectiveIncomeTaxRateReconciliationTaxCredits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationTaxExemptIncome



Period End2020-03-312019-03-312017-09-302016-09-30
Value0.010.010.010.02
Percentage of EffectiveIncomeTaxRateReconciliationTaxExemptIncome100.0100.0100.0100.0

us-gaap:PlanName

us-gaap:EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense

pfg:StockBasedCompensationPlans



Period End2020-03-312019-03-312018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-31
Value445756544
Percentage of EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNiGainLoss



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-63331421135-2
Percentage of EquitySecuritiesFvNiGainLoss100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-662491980-5
Percentage of EquitySecuritiesFvNiUnrealizedGainLoss100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1

pfg:InvestmentsOther, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value0020010
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1100.0100.0100.0100.0100.0100.0100.0

pfg:SeparateAccountAssets, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value144233138174315245164234
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1-144600.00.0138900.07936.4-315600.081800.010960.0-58725.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentSecondaryCategorization

us-gaap:CollateralizedDebtObligations, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-312019-03-312018-09-302018-03-31
Value0-200
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1100.0-113.6200.0-40.0

us-gaap:DebtSecurities, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-312019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value0-3-2-10-1-4
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1100.0-3200.0-113.61000.0-33.3-126.71125.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss

pfg:InvestmentsOther, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-31
Value-2
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss100.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentSecondaryCategorization

us-gaap:CollateralizedDebtObligations, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-220000013
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss762.10.00.00.00.00.00.00.0

us-gaap:CommercialMortgageBackedSecurities, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value10200001
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss-51.70.00.00.00.00.00.00.0

us-gaap:CorporateDebtSecurities, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-312019-09-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-16000003
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss562.10.00.00.00.00.00.0

us-gaap:DebtSecurities, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-400310018
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss1379.30.00.00.00.00.00.00.0

us-gaap:OtherDebtSecurities, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-3001000
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss106.90.00.00.00.00.00.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues

pfg:SeparateAccountAssets, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-174-30-156-47-28-60-45-61
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases

pfg:SeparateAccountAssets, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value679441794223134079
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentSecondaryCategorization

us-gaap:CollateralizedDebtObligations, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-312019-09-302018-09-302018-06-302017-09-30
Value1414765289
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases209.849.8156.012.112.4

us-gaap:CorporateDebtSecurities, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value27050001165
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases40.70.512.70.61.40.33.381.9

us-gaap:DebtSecurities, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value183932212701231194
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases271.699.053.716.3167.953.23.3118.1

us-gaap:OtherDebtSecurities, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value14451610494
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases21.248.741.012.710.540.8

us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements

pfg:SeparateAccountAssets, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-245-1624-70-8854176-171
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentSecondaryCategorization

us-gaap:CollateralizedDebtObligations, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value14146-106427-252
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements-57.7-28.4-38.1-0.4-72.951.0-14.4-1.3

us-gaap:CorporateDebtSecurities, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value26-1-130-11-6235
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements-10.81.2-328.6-0.312.7-11.01.4-20.9

us-gaap:DebtSecurities, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value1818501255113-2326
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements-73.8-52.87.1-17.2-63.1209.0-13.4-15.7

us-gaap:OtherDebtSecurities, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value134116939200
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements-5.3-25.8381.0-13.9-3.4169.7-0.10.1

us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales

pfg:SeparateAccountAssets, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value184307112101276124104193
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentSecondaryCategorization

us-gaap:CorporateDebtSecurities, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-09-30
Value0000548
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales0.30.20.20.22.14.04.2

us-gaap:DebtSecurities, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-09-30
Value00005437
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales0.30.20.20.22.14.019.3

us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements

pfg:SeparateAccountAssets, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-44-81-2320-173-713-4
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentSecondaryCategorization

us-gaap:CorporateDebtSecurities, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value0118066421
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements-1.1-2.2-8.133.3-3.5-93.134.3-507.1

us-gaap:DebtSecurities, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value17210993029
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements-3.8-8.8-9.2200.0-5.2-129.2224.8-707.1

us-gaap:OtherDebtSecurities, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value14001100
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements-2.7-5.0-0.366.7-0.8-26.41.5-4.8

us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentSecondaryCategorization

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3

us-gaap:CorporateDebtSecurities, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-312018-06-302018-03-31
Value12400
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3100.0100.0100.0

us-gaap:DebtSecurities, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-312019-06-302018-09-302018-06-302018-03-312017-09-30
Value170334212361
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3137.00.00.03100.0533.30.0

us-gaap:OtherDebtSecurities, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-31
Value46
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel337.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentSecondaryCategorization

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3

us-gaap:CollateralizedDebtObligations, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-312018-09-302018-06-302018-03-312017-09-30
Value14768391927
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3100.0100.0100.0100.0100.0

us-gaap:CorporateDebtSecurities, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-312018-09-302018-06-302018-03-31
Value4691128
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel331.414.028.8148.7

us-gaap:DebtSecurities, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value2367226127524877
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3160.30.00.00.0187.7131.1248.7283.2

us-gaap:OtherDebtSecurities, us-gaap:FairValueMeasurementsRecurring, us-gaap:AvailableforsaleSecurities



Period End2020-03-312019-09-302019-03-312018-09-30
Value4272648
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel328.90.00.071.8

us-gaap:FairValueByLiabilityClass, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings

pfg:InvestmentAndUniversalLifeContracts, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-09-302019-03-312018-09-30
Value-340-1804122
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings100.0100.0100.0100.0

us-gaap:FairValueByLiabilityClass, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome

pfg:InvestmentAndUniversalLifeContracts, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-09-302019-03-312018-09-30
Value-300000.0200000.0100000.0-100000.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome100.0100.0100.0100.0

us-gaap:FairValueByLiabilityClass, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements

pfg:InvestmentAndUniversalLifeContracts, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-09-302019-03-312018-09-30
Value0220-2
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements100.0100.0100.0100.0

us-gaap:FairValueByLiabilityClass, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements

pfg:InvestmentAndUniversalLifeContracts, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-09-302019-03-312018-09-30
Value6111
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements100.0100.0100.0100.0

us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings

us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value016-1-5-11
Percentage of FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchasesSalesIssuesSettlements

us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value-105100
Percentage of FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchasesSalesIssuesSettlements100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSales

us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value10-5-100
Percentage of FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSales100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:FairValueOptionChangesInFairValueGainLoss1

us-gaap:EquityMethodInvestments



Period End2020-03-312019-06-302019-03-312018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-30
Value002010010000
Percentage of FairValueOptionChangesInFairValueGainLoss1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-30
Value000000110110001000101100110
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivablePortfolioSegment

us-gaap:ResidentialMortgage



Period End2020-03-312019-03-31
Value600000.0700000.0
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery100.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs



Period End2020-03-312019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value00001011110013315239615141327112510
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivablePortfolioSegment

us-gaap:CommercialRealEstatePortfolioSegment



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs0.0

us-gaap:MortgageLoansOnRealEstateLoanType

us-gaap:ResidentialMortgage



Period End2020-03-312019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value00001011110013315233551378798
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.091.237.481.838.394.352.930.064.436.876.9

us-gaap:FinancingReceivablePortfolioSegment

us-gaap:FinancingReceivableSignificantPurchases

us-gaap:CommercialRealEstatePortfolioSegment



Period End2020-03-312019-03-31
Value1212
Percentage of FinancingReceivableSignificantPurchases100.0100.0

us-gaap:ResidentialMortgage



Period End2020-03-312019-03-31
Value22633
Percentage of FinancingReceivableSignificantPurchases1771.9257.4

us-gaap:FinancingReceivablePortfolioSegment

us-gaap:FinancingReceivableSignificantSales

us-gaap:CommercialRealEstatePortfolioSegment



Period End2020-03-312019-03-31
Value10
Percentage of FinancingReceivableSignificantSales100.0100.0

us-gaap:ResidentialMortgage



Period End2020-03-312019-03-31
Value2410
Percentage of FinancingReceivableSignificantSales2263.62180.0

us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:GainLossOnDerivativeInstrumentsNetPretax

us-gaap:ForeignExchangeContract, us-gaap:NetInvestmentHedging



Period End2020-03-31
Value7
Percentage of GainLossOnDerivativeInstrumentsNetPretax100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:IncomeStatementLocation

us-gaap:InterestRateContract, us-gaap:FairValueHedging, pfg:NetInvestmentIncomeLoss



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-2-1-2-2-2-3-3
Percentage of GainLossOnDerivativeInstrumentsNetPretax-28.00.00.00.00.00.00.0

us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:NetInvestmentHedging



Period End2020-03-31
Value7
Percentage of GainLossOnDerivativeInstrumentsNetPretax100.0

us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:IncomeStatementLocation

us-gaap:CashFlowHedging, pfg:NetInvestmentIncomeLoss



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value676666
Percentage of GainLossOnDerivativeInstrumentsNetPretax90.70.00.00.00.00.0

us-gaap:CashFlowHedging, pfg:NetRealizedCapitalGainsLosses



Period End2020-03-312019-06-302018-09-302018-06-30
Value0920
Percentage of GainLossOnDerivativeInstrumentsNetPretax12.00.00.00.0

us-gaap:GainLossOnInvestments



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value131-42-484-567-25676-95-16443313638-11466-46860-50-80-5032870-6-3037-58-20-66-45
Percentage of GainLossOnInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:ForeignExchangeContract, us-gaap:CashFlowHedging, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome



Period End2020-03-312019-06-302018-09-302018-06-302018-03-31
Value29200
Percentage of GainLossOnInvestments1.7-237.5-41.80.91.6

us-gaap:InterestRateContract, us-gaap:CashFlowHedging, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome



Period End2020-03-31
Value-1
Percentage of GainLossOnInvestments-1.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

us-gaap:IncomeLossFromEquityMethodInvestments

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherNotesGuarantor



Period End2020-03-312019-03-31
Value-316-461
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value139233
Percentage of IncomeLossFromEquityMethodInvestments-44.1-50.5

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceCompany



Period End2020-03-312019-03-31
Value-142-235
Percentage of IncomeLossFromEquityMethodInvestments44.951.0

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value318464
Percentage of IncomeLossFromEquityMethodInvestments-100.8-100.6

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ConsolidationEliminations, pfg:ConsolidationEliminationsAndOtherShelfRegistrationDebtGuarantor



Period End2020-03-312019-03-31
Value-653-946
Percentage of IncomeLossFromEquityMethodInvestments206.7205.0

srt:ReportableLegalEntities, pfg:SubsidiaryPrincipalFinancialServicesConsolidate



Period End2020-03-312019-03-31
Value334482
Percentage of IncomeLossFromEquityMethodInvestments-105.9-104.5

srt:ReportableLegalEntities, srt:ParentCompany



Period End2020-03-312019-03-31
Value318464
Percentage of IncomeLossFromEquityMethodInvestments-100.8-100.6

us-gaap:IncreaseDecreaseInDeposits



Period End2020-03-312019-03-312018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value244-3512464-13-396-13-2538
Percentage of IncreaseDecreaseInDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value244-35
Percentage of IncreaseDecreaseInDeposits100.0100.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value244-35
Percentage of IncreaseDecreaseInDeposits100.0100.0

us-gaap:AwardType

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:EmployeeStockOption



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value00000111111
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PerformanceShares



Period End2020-03-312019-09-302019-06-302018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-31
Value100000.0100000.0100000.0300000.0200000.0200000.0200000.0200000.0200000.0300000.0200000.0200000.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements20.011.111.133.320.014.311.811.110.521.40.00.0

us-gaap:RestrictedStockUnitsRSU



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-31
Value1111111112111
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements320.0155.6133.3214.3188.9160.0135.7111.8100.0105.3114.30.00.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1



Period End2020-03-312019-03-312018-03-312017-03-312016-03-31
Value168162146140127
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1100.0100.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1



Period End2020-03-312019-03-312018-03-312017-03-312016-03-31
Value166157145143130
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1100.0100.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1



Period End2020-03-312019-03-312018-03-312017-03-312016-03-31
Value344350312312287
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1100.0100.0100.0100.0100.0

us-gaap:MinorityInterestChangeInRedemptionValue



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-31
Value00-12-200-3334
Percentage of MinorityInterestChangeInRedemptionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value22531118100223321
Percentage of MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value22531118100223321
Percentage of MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:MinorityInterestDecreaseFromRedemptions



Period End2020-03-312018-09-302018-06-302016-03-312015-03-312014-03-312013-03-312011-03-31
Value0023-5825304
Percentage of MinorityInterestDecreaseFromRedemptions100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312018-09-302018-06-302016-03-312015-03-312011-03-31
Value0-121-15172
Percentage of MinorityInterestDecreaseFromRedemptions66.7-700.093.0260.3198.944.4

us-gaap:NoncontrollingInterest



Period End2020-03-312018-06-302015-03-312014-03-312013-03-312011-03-31
Value01-1525302
Percentage of MinorityInterestDecreaseFromRedemptions33.37.0-173.6100.0100.055.6

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value-37522325354194107634225633329-52318014
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesNotesGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalFinancialServicesAndOther



Period End2020-03-312019-03-31
Value-319
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.089.2

us-gaap:ConsolidationItems, pfg:ParentAndSubsidiariesShelfRegistrationDebtGuarantor

srt:ReportableLegalEntities, pfg:SubsidiariesPrincipalLifeInsuranceAndOtherConsolidate



Period End2020-03-312019-03-31
Value-322
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0

us-gaap:NetIncomeLossAttributableToRedeemableNoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-31
Value-232420210202200
Percentage of NetIncomeLossAttributableToRedeemableNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value28827738642945645639784181030934831830832236825330024141427024030629323324522217821817917320116463258196199142134190141184150112
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-31
Value308282388431458458401350
Percentage of NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-31
Value194111141
Percentage of NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest6.41.70.50.40.40.31.10.5

us-gaap:RetainedEarnings



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-31
Value288277386429456456397348
Percentage of NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest93.698.399.599.699.699.798.999.5

us-gaap:StatementEquityComponents

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-06-30
Value046
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent100.0100.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-09-302019-03-31
Value5216-2
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent10540.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-03-312015-03-31
Value-14047849621097-186-487-82113636866
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent-280880.00.02078.60.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-03-312015-03-31
Value-166864610221130-202-696-769195493-25
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent-333620.00.02208.40.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-03-312015-03-31
Value-316-154237-22-2326463126-126
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent-63380.00.05.40.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax

us-gaap:AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-06-30
Value063
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax100.0100.0

us-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-31
Value-336-163440
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax-56100.00.07.30.0

us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-31
Value661912-8
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax11033.30.020.20.0

us-gaap:AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterest



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
Value-2777139118041817-282-777-1303137603303312954911-191-1090283-301
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax-462950.00.02845.40.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

us-gaap:AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-06-302016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-30
Value0468881112123
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-31
Value-325-1572-38
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax-65160.00.05.20.0

us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-31
Value521510-6
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax10400.00.021.80.0

us-gaap:AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterest



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
Value-2177109014091424-228-619-102384392200216623599-125-717185-198
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax-435480.00.03043.40.00.00.00.00.00.00.02701.27795.07487.5-1054.6-5981.71541.7-5500.0

us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax

us-gaap:AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-06-302016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-30
Value0175558881
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-31
Value-10-522
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax-10800.00.012.90.0

us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-31
Value1442-1
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax14200.00.015.80.0

us-gaap:AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterest



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
Value-600301394392-54-158-2805221010296330312-66-37298-103
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax-600300.00.02309.40.00.00.00.00.00.00.01717.95800.05489.5-790.5-4489.21184.3-5463.2

us-gaap:OtherComprehensiveIncomeLossBeforeTax



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-30
Value-202186313631451-267-802-945218513310169528766-227-5003-262356279-3-848-54478121298-353263
Percentage of OtherComprehensiveIncomeLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterest



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
Value151378151212127771313132020205
Percentage of OtherComprehensiveIncomeLossBeforeTax-0.71.65.71.1-4.6-1.5-1.33.51.52.58.02.61.8-8.9-4.1597.1-2.1

us-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterest



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
Value-305-1633140-32-2476695-868-2125138-306-38-168-210
Percentage of OtherComprehensiveIncomeLossBeforeTax15.1-18.92.32.812.130.8-7.143.9-1.621.9-12.64.718.1134.77.6-4941.280.2

us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-31
Value61162-5
Percentage of OtherComprehensiveIncomeLossBeforeTax-3.01.90.2-0.4

us-gaap:AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterest