CB


Line plots across dimensions of each concept
Tables

Table of contents



us-gaap:CommonStockValue

us-gaap:CommonStockParOrStatedValuePerShare

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:Revenues

us-gaap:PremiumsEarnedNet

us-gaap:NetInvestmentIncome
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:StatementBusinessSegments
us-gaap:InvestmentType
us-gaap:RealizedInvestmentGainsLosses

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet
dei:LegalEntity
us-gaap:StatementBusinessSegments

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense
us-gaap:StatementBusinessSegments

us-gaap:GeneralAndAdministrativeExpense
us-gaap:StatementBusinessSegments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:StatementBusinessSegments

us-gaap:NetIncomeLoss
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems
us-gaap:StatementBusinessSegments
us-gaap:StatementEquityComponents

us-gaap:Assets
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems

us-gaap:Liabilities
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByMeasurementBasis

us-gaap:LiabilitiesAndStockholdersEquity
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems

us-gaap:StockholdersEquity
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems
us-gaap:StatementEquityComponents

us-gaap:CashAndCashEquivalentsAtCarryingValue
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems

us-gaap:Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:IntangibleAssetsNetIncludingGoodwill
dei:LegalEntity

us-gaap:LongTermDebt

us-gaap:StockholdersEquity
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:TreasuryStockValue

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:NetCashProvidedByUsedInOperatingActivities
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems

us-gaap:NetCashProvidedByUsedInInvestingActivities
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems

us-gaap:NetCashProvidedByUsedInFinancingActivities
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems

us-gaap:NetCashProvidedByUsedInOperatingActivities
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems

us-gaap:NetIncomeLoss
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems
us-gaap:StatementBusinessSegments
us-gaap:StatementEquityComponents

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:NetCashProvidedByUsedInInvestingActivities
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems

us-gaap:NetCashProvidedByUsedInFinancingActivities
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems

us-gaap:PaymentsForRepurchaseOfCommonStock
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems
dei:LegalEntity
cb:AdvancesToFromAffiliatesFinancingActivities
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:SubsequentEventType

cb:DebtSecuritiesAvailableForSaleCreditImpairmentChargesIntenttoSell
us-gaap:ConsolidatedEntities
cb:EquityInEarningsOfSubsidiaries
us-gaap:ConsolidationItems
us-gaap:StatementEquityComponents
cb:FundingDividendsDeclaredFromAdditionalPaidInCapital
us-gaap:StatementEquityComponents
cb:FundingDividendsDeclaredToRetainedEarnings

cb:NetPriorPeriodDevelopment
us-gaap:ConsolidatedEntities
cb:NetProceedsFromPaymentsToAffiliatedNotionalCashPoolingProgram
us-gaap:ConsolidationItems

cb:NetRealizedGainsLosses
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:StatementBusinessSegments

cb:NetrealizedgainslossesexcludingOTTI
dei:LegalEntity
cb:PaymentOfContributionsToSubsidiary
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:SubsequentEventType
us-gaap:ConsolidationItems

cb:PolicyAcquisitionCostsAndAdministrativeExpenses
dei:LegalEntity
us-gaap:ConsolidatedEntities

cb:PriorPeriodDevelopmentnetadjustments

cb:ProceedsFromSaleOfAvailableForSaleSecuritiesDebtCondensed
dei:LegalEntity

cb:ProceedsFromSalesToBeAnnouncedMortgageBackedSecurities

cb:SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss
us-gaap:StatementBusinessSegments
us-gaap:Range
cb:SignificantUnobservableInputsAnnuitizationRate

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments

us-gaap:AdditionsToContractHoldersFunds
dei:LegalEntity
us-gaap:StatementEquityComponents
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AmortizationOfIntangibleAssets
dei:LegalEntity
us-gaap:StatementBusinessSegments

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:BenefitsLossesAndExpenses

us-gaap:BusinessCombinationIntegrationRelatedCosts

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems
dei:LegalEntity
us-gaap:CashDividendsPaidToParentCompany
us-gaap:ConsolidationItems
us-gaap:Currency
us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:ComprehensiveIncomeNetOfTax
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease
us-gaap:AdjustmentsForNewAccountingPronouncements
us-gaap:InvestmentType
us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss
us-gaap:InvestmentType
us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment
us-gaap:InvestmentType
us-gaap:DebtSecuritiesAvailableForSaleRealizedLossExcludingOtherThanTemporaryImpairment
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanInterestCost
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
us-gaap:IncomeStatementLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanServiceCost
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:RetirementPlanType

us-gaap:DerivativeGainLossOnDerivativeNet
us-gaap:DerivativeInstrumentRisk
us-gaap:StatementBusinessSegments
us-gaap:StatementEquityComponents
us-gaap:DividendsCommonStockCash

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:InvestmentType
us-gaap:EquitySecuritiesFvNiRealizedGainLoss
us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass, us-gaap:GuaranteedInsuranceContractTypeOfBenefit
us-gaap:FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass, us-gaap:GuaranteedInsuranceContractTypeOfBenefit
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings

us-gaap:FairValueOptionChangesInFairValueGainLoss1

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax
us-gaap:InvestmentType
us-gaap:GainLossOnSaleOfInvestments

us-gaap:ImpairmentOfInvestments

us-gaap:IncomeTaxesPaidNet

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInAccruedIncomeTaxesPayable

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes

us-gaap:IncreaseDecreaseInDeferredPolicyAcquisitionCosts

us-gaap:IncreaseDecreaseInFuturePolicyBenefitReserves

us-gaap:IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve

us-gaap:IncreaseDecreaseInPremiumsReceivable

us-gaap:IncreaseDecreaseInReinsurancePayables

us-gaap:IncreaseDecreaseInReinsuranceRecoverable

us-gaap:IncreaseDecreaseInUnearnedPremiums

us-gaap:IncreaseDecreaseInUnearnedPremiumsNet

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:InterestIncomeExpenseNet
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:StatementBusinessSegments

us-gaap:InterestPaidNet

us-gaap:LiabilityForFuturePolicyBenefitsPeriodExpense
dei:LegalEntity
us-gaap:StatementBusinessSegments

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1
us-gaap:IncomeStatementLocation, us-gaap:RetirementPlanType
us-gaap:NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:RetirementPlanType

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesBeforeReclassificationAdjustmentsTax

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

us-gaap:OtherComprehensiveIncomeLossBeforeTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax

us-gaap:OtherComprehensiveIncomeLossTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax

us-gaap:OtherOperatingIncomeExpenseNet
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:StatementBusinessSegments

us-gaap:OtherThanTemporaryImpairmentLossDebtSecuritiesPortionRecognizedInEarnings
us-gaap:InvestmentType

us-gaap:OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities

us-gaap:PaymentsForLossesAndLossAdjustmentExpense

us-gaap:PaymentsForOtherDeposits
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems
us-gaap:StatementGeographical, dei:LegalEntity

us-gaap:PaymentsForProceedsFromDerivativeInstrumentInvestingActivities
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:PaymentsForProceedsFromOtherInvestingActivities
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:PaymentsForProceedsFromShortTermInvestments
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:PaymentsForSecuritiesPurchasedUnderAgreementsToResell
dei:LegalEntity

us-gaap:PaymentsOfDividendsCommonStock
us-gaap:ConsolidatedEntities

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesEquity
dei:LegalEntity

us-gaap:PaymentsToAcquireHeldToMaturitySecurities
dei:LegalEntity

us-gaap:PaymentsToAcquireLimitedPartnershipInterests
dei:LegalEntity

us-gaap:PremiumsWrittenNet
dei:LegalEntity
us-gaap:StatementBusinessSegments

us-gaap:PresentValueOfFutureInsuranceProfitsAmortizationExpense1
dei:LegalEntity
us-gaap:ProceedsFromContributionsFromParent
us-gaap:ConsolidationItems

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
dei:LegalEntity

us-gaap:ProceedsFromLimitedPartnershipInvestments
dei:LegalEntity

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities
dei:LegalEntity

us-gaap:ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase
dei:LegalEntity

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities
us-gaap:ConsolidatedEntities

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesEquity
dei:LegalEntity

us-gaap:ProceedsFromShortTermDebt

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax

us-gaap:RepaymentsOfShortTermDebt
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
us-gaap:StatementEquityComponents
us-gaap:StockGrantedDuringPeriodValueSharebasedCompensation
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
us-gaap:ShareRepurchaseProgram
us-gaap:TreasuryStockSharesAcquired
us-gaap:ShareRepurchaseProgram, us-gaap:SubsequentEventType
us-gaap:ShareRepurchaseProgram
us-gaap:TreasuryStockValueAcquiredCostMethod
us-gaap:ShareRepurchaseProgram, us-gaap:SubsequentEventType
us-gaap:StatementEquityComponents

us-gaap:UnderwritingIncomeLoss
us-gaap:StatementBusinessSegments
us-gaap:InvestmentType
us-gaap:UnrealizedGainLossOnInvestments

us-gaap:WithdrawalFromContractHoldersFunds
dei:LegalEntity
us-gaap:ConsolidatedEntities
cb:Affiliatednotionalcashpoolingprograms
us-gaap:ConsolidationItems

cb:Debtsecuritiesheldtomaturitynetcarryingvalue
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument

cb:FixedMaturitiesPercentofTotalAmortizedcost
us-gaap:CreditRatingStandardPoors
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
cb:InvestmentDerivativeInstrumentsFairValue
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
cb:InvestmentDerivativeInstrumentsLiability
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:ConsolidatedEntities
cb:InvestmentsInSubsidiariesToBeEliminatedUponConsolidation
us-gaap:ConsolidationItems

cb:Investmentsinpartiallyownedinsurancecompanies

cb:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyRevaluationAndOther

cb:OtherAssetsCondensed
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
cb:OtherDerivativeInstrumentsFairValue
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

cb:ReinsuranceRecoverableFuturePolicyBenefits
dei:LegalEntity
us-gaap:ConsolidationItems

cb:ReinsuranceRecoverableLossesAndLossExpenses
dei:LegalEntity
us-gaap:ConsolidationItems

cb:RestrictedAssetsDepositsWithNonUnitedStatesRegulatoryAuthorities

cb:RestrictedAssetsDepositsWithUnitedStatesRegulatoryAuthorities

cb:Securitieslendingcollateral

cb:Shortterminvestmentsamortizedcost

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent

us-gaap:AccruedInvestmentIncomeReceivable

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AlternativeInvestment
us-gaap:InvestmentType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:AssetsHeldInTrust

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue

us-gaap:AvailableForSaleSecuritiesDebtSecurities

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLoss
us-gaap:AdjustmentsForNewAccountingPronouncements
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss
us-gaap:InvestmentType

us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLoss
us-gaap:AdjustmentsForNewAccountingPronouncements
us-gaap:FinancialInstrument

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredPolicyAcquisitionCosts
us-gaap:StatementGeographical, us-gaap:SubsequentEventType, dei:LegalEntity
us-gaap:DepositAssets
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeAssetFairValueGrossLiability
us-gaap:DerivativeInstrumentRisk
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeFairValueOfDerivativeLiability

us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeNotionalAmount
dei:LegalEntity
us-gaap:DueFromAffiliates
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems
dei:LegalEntity
us-gaap:DueToAffiliateCurrentAndNoncurrent
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems
dei:LegalEntity
us-gaap:EquityMethodInvestmentOwnershipPercentage

us-gaap:EquitySecuritiesFvNi
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
us-gaap:InvestmentType
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass, us-gaap:GuaranteedInsuranceContractTypeOfBenefit
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:GuaranteedInsuranceContractTypeOfBenefit
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:GuaranteedInsuranceContractTypeOfBenefit
us-gaap:GuaranteedInsuranceContractTypeOfBenefit
us-gaap:GuaranteedInsuranceContractTypeOfBenefit
us-gaap:GuaranteedBenefitLiabilityNet

us-gaap:HeldToMaturitySecurities
us-gaap:CreditRatingStandardPoors
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue

us-gaap:HeldToMaturitySecuritiesFairValue

us-gaap:Investments
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:LiabilitiesRelatedToInvestmentContractsFairValueDisclosure
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpense
dei:LegalEntity
us-gaap:ConsolidationItems

us-gaap:LiabilityForFuturePolicyBenefits
dei:LegalEntity
us-gaap:ConsolidationItems
us-gaap:DerivativeInstrumentRisk

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
us-gaap:Range
us-gaap:LongDurationContractsAssumptionsByProductAndGuaranteeLapseRate
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:LongTermDebtFairValue
us-gaap:FairValueByMeasurementBasis

us-gaap:ObligationToReturnSecuritiesReceivedAsCollateral

us-gaap:OperatingLeaseLiability

us-gaap:OtherAssets

us-gaap:OtherLiabilities
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems

us-gaap:OtherLongTermInvestments
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:InvestmentType

us-gaap:OtherRestrictedAssetsCurrent

us-gaap:OtherShortTermInvestments
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForRepurchaseAgreements
us-gaap:AssetsSoldUnderAgreementsToRepurchaseMaturityPeriods
us-gaap:AssetsSoldUnderAgreementsToRepurchaseMaturityPeriods, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument

us-gaap:PremiumsReceivableAtCarryingValue
dei:LegalEntity
us-gaap:ConsolidationItems

us-gaap:PrepaidReinsurancePremiums

us-gaap:ReinsurancePayable

us-gaap:ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments

us-gaap:ReinsuranceRecoverablesAllowance

us-gaap:ReinsuranceRecoverablesOnPaidAndUnpaidLosses

us-gaap:RestrictedCash
dei:LegalEntity

us-gaap:RestrictedCashAndCashEquivalents

us-gaap:RestrictedCashAndInvestments

us-gaap:RestrictedInvestments
us-gaap:FinancialInstrument
us-gaap:SecuredBorrowingsGrossDifferenceAmount

us-gaap:SecuredDebtRepurchaseAgreements
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByMeasurementBasis

us-gaap:SecuritiesHeldAsCollateralAtFairValue
us-gaap:AssetsSoldUnderAgreementsToRepurchaseMaturityPeriods, us-gaap:FinancialInstrument
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:SecuritiesSoldUnderAgreementsToRepurchase
dei:LegalEntity
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:SeparateAccountAssets
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:ShortTermBorrowings
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:ShorttermDebtFairValue
us-gaap:FairValueByMeasurementBasis
us-gaap:ShareRepurchaseProgram
us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

us-gaap:TreasuryStockShares

us-gaap:UnearnedPremiums
dei:LegalEntity
us-gaap:ConsolidationItems

us-gaap:ValueOfBusinessAcquiredVOBA
dei:LegalEntity

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 █████████████████▁▁▁▁▁▂▂▃▃▄▄▄▅▅▅▆▆▆▆▆▆1112111121111211112111121111211112111121111211112111121111211112111121111211112111121783378337833783380558278850187248899907392499423959197599927100951009510095100981007510161NANANA10503NANANA
us-gaap:CommonStockParOrStatedValuePerShare ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▂▃▄▄▅▅▆▆▇▇██████24.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.7725.426.0126.5927.0427.4927.9528.4328.8929.3429.7930.2730.2730.2730.2730.2730.57NANANANANANANA
us-gaap:CommonStockSharesIssued █████████████████▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁479479479479479479479479479479479479479479479479479342342342342342342342342342342342342342342342342342342342341341NANANA337NANANA
us-gaap:CommonStockSharesOutstanding ▇▇▇▇█████████████▁▁▁▁▁▁▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂451451453456458459461463465463464465467465465465464324324323327328332336337339340340340340339339338336336337337334NANANA336NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding 454NA458460461NA466468469NA466471472NA471471450NA327328331NA337341342NA343344343NA342342341NA338341339NA341341339NANANANA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic 451NA454457458NA462465465NA466467468NA468467446NA324325328NA334337338NA340341340NA340339338NA338338337NA340339338NANANANA
us-gaap:EarningsPerShareBasic ▂▆▆▆▆▃▆▇▆█▁▇▆█▇▄▃▅▄▇▅▅▆▆▆▇▇▆▇▆▅▃▇▆▁▅▃▇▅▅▆▇▄▄▅0.562.592.42.522.270.772.662.782.323.29-0.152.792.333.442.91.550.982.11.632.892.081.682.352.32.162.932.682.612.82.241.880.962.872.22-0.091.790.772.941.981.992.232.821.461.581.69
us-gaap:EarningsPerShareDiluted ▂▆▆▆▆▃▆▇▆█▁▇▆█▇▄▃▅▄▇▅▅▆▆▆▇▇▆▇▆▅▃▇▆▁▅▃▇▅▅▆▇▄▄▅0.552.572.382.52.250.762.642.762.33.27-0.152.772.313.412.881.540.972.081.622.862.051.662.322.282.142.92.662.592.772.221.860.962.842.2-0.091.770.762.921.971.982.222.811.461.581.69
  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 ▆██▇▇▆█▇▆▇▇▇▆▇▇▇▅▂▃▃▂▃▃▃▂▃▃▂▂▂▃▁▂▂▂▂▁▂▁▁▂▂▁▁▁769787389045852778767626875085107831801586108108751081688527789768774679487150484389473752004815441950745172470543104687513839264185447942944253380844093888376039494272368135473575
us-gaap:PremiumsEarnedNet ▇▇█▇▆▇▇▇▆▆▇▇▆▆▇▇▆▂▃▃▂▃▃▃▂▃▃▂▂▂▃▂▁▂▃▂▁▂▁▁▁▁▁▁▁779479358327789171377465790876647027721878077237677270597688740565974207471943603927437047544332397043634610406735733848466537833381383144903757330935723422323332773387339332663194
us-gaap:NetInvestmentIncome ████▇▇▇▇▇▆▇▆▅▅▅▅▄▁▁▂▁861858873859836848823828806797813770745744739708674532549562551NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetInvestmentIncome dei:LegalEntity cb:OtherAceLimitedSubsidiariesAndEliminations859NA875864839NA818822800NA809764742NA736704669NA547562NANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetInvestmentIncome us-gaap:StatementBusinessSegments cb:SegmentInsuranceNorthAmericanCommercialPCMemberMember516NA532521510NA503510503NA497490478NA477468426NA260262NANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetInvestmentIncome us-gaap:StatementBusinessSegments cb:SegmentInsuranceOverseasGeneral▅▅▅▆▄▇▆▆▆▅█▅▅▆▆▅▅▁▂▄145145148151144158155155151150164148148155152147146125132139NANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetInvestmentIncome us-gaap:StatementBusinessSegments cb:SegmentLife██▇█▆▆▅▅▅▅▄▃▃▃▂▂▁▁▁▁9595929789888585838378777576716967676666NANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RealizedInvestmentGainsLosses us-gaap:InvestmentType us-gaap:OtherInvestments▆▅▅█▁▃▆▄█5-2-430-44-285-1129NANA00NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PolicyholderBenefitsAndClaimsIncurredNet ▅▆▆▆▅▅▆▅▅▅█▅▄▄▅▅▄▂▂▂▂▂▂▂▂▂▂▂▁▂▃▂▁▂▂▂▂▁▁▁▁▁▁▁▁448548655052471540984610486844874102427262474146378938554269425436742302264324172122241626842388216125172655225019262683304721191804228627452226226319711887180019211900188518211816
 us-gaap:PolicyholderBenefitsAndClaimsIncurredNet dei:LegalEntity cb:OtherAceLimitedSubsidiariesAndEliminations4485NA505247154098NA486844874102NA624741463789NA4269425436742302264324172122NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PolicyholderBenefitsAndClaimsIncurredNet us-gaap:StatementBusinessSegments cb:SegmentInsuranceNorthAmericanCommercialPCMemberMember2181NA205122141973NA188120841908NA258019361860NA186319711747NA913916915NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PolicyholderBenefitsAndClaimsIncurredNet us-gaap:StatementBusinessSegments cb:SegmentInsuranceNorthAmericanPersonalPCMember▅▇▅▆▆▆▇▆▇▇█▅▅▅▅▅▅▁▂▁▁6838656747477577558607288868871062683633642594661661144179156111NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PolicyholderBenefitsAndClaimsIncurredNet us-gaap:StatementBusinessSegments cb:SegmentInsuranceOverseasGeneral█▇▇▆▆▇▆▆▆▄█▄▆▅▃▆▅▂▁▃▃12581221115411251106116611141071107896512819641071105284310891021748674816814NANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense █▇█▇▇▇▇▇▇▇▇▇▆▆▇█▆▁▁▁▁▁▂▁▁16151542160315441464148015041464146414471488144913971417151415601413736771727707764825758728NA678665614NA609619582NA666604555NA607536554NANANANA
 us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense us-gaap:StatementBusinessSegments cb:SegmentInsuranceNorthAmericanCommercialPCMemberMember492NA459459459NA458448472NA469464487NA522545482NA142131130NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense us-gaap:StatementBusinessSegments cb:SegmentInsuranceNorthAmericanPersonalPCMember▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇█▇▂▁▁▂2452402402372312382362282372262262302172192292692492613-131NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense us-gaap:StatementBusinessSegments cb:SegmentInsuranceOverseasGeneral████▇▇▆▆▆▆▆▆▅▅▅▅▄▁▁▁▁642646630629596592582584588568569555529550546537503391405396389NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense us-gaap:StatementBusinessSegments cb:SegmentLife█▇█▅▃▅▄▄▃▆▃▃▂▃▃▄▂▄▂▂▁180166176150128152139138128154132130114123127137122134117118107NANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:GeneralAndAdministrativeExpense ▆█▆▆▅▆▅▆▅▆▅▅▄▅▇█▇▂▂▂▁▂▁▂▁741810752758710728719747692737714706676708772829772570568578554590554566535NA563564514NA519514510NA517515494NA433463460NANANANA
 us-gaap:GeneralAndAdministrativeExpense us-gaap:StatementBusinessSegments cb:SegmentInsuranceNorthAmericanCommercialPCMemberMember259NA256259240NA251253231NA256241231NA275299266NA154154151NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:GeneralAndAdministrativeExpense us-gaap:StatementBusinessSegments cb:SegmentInsuranceOverseasGeneral▄▅▄▆▃▄▃▆▁▃▂▂▂▄▅█▅▁▂▄▄258262257265249257252266239248246243245256261277263241246254256NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:GeneralAndAdministrativeExpense us-gaap:StatementBusinessSegments cb:SegmentLife▄█▅▄▅▃▄▅▄▄▄▄▂▆▄▄▂▁▃▃▂768680787975778078777777728177777270747473NANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▃▆▆▆▆▃▆▇▆▆▁▇▆█▇▅▃▄▄▅▄46713421321135812285141414151212171151-15515051221186916378815637506601085801NANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IncomeTaxExpenseBenefit ▇▇█▇▇▇▇▇▆▁▄▇▆██▇▆▆▆▇▆█▇▆▆215169230208188159183218135-382-852001282592771551246713214312023217613393NA155115122NA147148110NA16512297NA160142124NANANANA
 us-gaap:IncomeTaxExpenseBenefit dei:LegalEntity cb:OtherAceLimitedSubsidiariesAndEliminations208NA260248226NA202249189NA-2283234NA407187268328159165143NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeTaxExpenseBenefit us-gaap:StatementBusinessSegments us-gaap:Corporate215NA230208188NA183218135NA-85200128NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss ▂▆▆▆▆▃▆▇▆█▁▇▆█▇▄▃▄▃▅▄▄▅▅▄▅▅▅▅▄▄▃▅▄▁▄▂▅▄▄▄▅▃▄▄25211731091115010403551231129410821533-701305109316101360726439683528942681555785779734998916891953765640328973750-316072591001675677755953494535567
 us-gaap:NetIncomeLoss dei:LegalEntity cb:OtherAceLimitedSubsidiariesAndEliminations264NA111812621140NA125813581223NA2313871224NA1423867619505538948693NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:ConsolidatedEntities srt:GuarantorSubsidiaries585NA759604609NA628337684NA62NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:ConsolidatedEntities srt:ParentCompany▂▆▆▆▆▃▇▇▆█▁25211731091115010403551231129410821533-70NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▂▆▆▆▆▃▆▇▆█▁▇▆█▇▄▃▄▃▅▄▄▅▅▄25211731091115010403551231129410821533-701305109316101360726439683528942681555785779734NANANA953NANANA973NANA607259NANA677755NANANANA
  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 █████▇▇▇▇▇▇▇▇▇▇▇▆▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁1731271769431751481745161713471677711676841675341687811670221675781629881609671597861618101602031566441023669776099840983989824897557974479517994510945849368893461925459350890701897498750588720892548622083355NANANA77980NANANA
 us-gaap:Assets dei:LegalEntity cb:OtherAceLimitedSubsidiariesAndEliminations█████▇▇█▇██▇▇▇▇▇▇▁187209189152189527187607185896181741181250183981182303185724186047180102178654177586180254178643174453108967NANANA112608NANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Assets us-gaap:ConsolidatedEntities srt:GuarantorSubsidiaries▂██▅▅▂▁51349539395409452657527845143250994NANA51621NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Assets us-gaap:ConsolidatedEntities srt:ParentCompany▅██▆▄▁▂53284556435554854278530175060951448NANA51554NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:Liabilities ██████▇▇█▇▇▇▇▇▇▇▇▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▂▂▁▁120930121612120576120714118992117459116750116563117494115850117107112639111743111511113438112977110747732316863370285686966866167540671226581065685663666639365519650146654564939643186298964970651416284460381NANANA58313NANANA
 us-gaap:Liabilities dei:LegalEntity cb:OtherAceLimitedSubsidiariesAndEliminations▇███▇▇▇▇▇██▇▇▇▇▇▇▁11820411890211880711844911759911570511511111678111518712044612129611590311442611428311666011666111317078257NANANA76693NANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Liabilities us-gaap:ConsolidatedEntities srt:GuarantorSubsidiaries▁▃▅▄▇██20050212602196221860234372372823473NANA23825NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Liabilities us-gaap:FairValueByFairValueHierarchyLevel us-gaap:FairValueInputsLevel2▇█▅▅▂▁▁▁▅▂▂▂▂▃▄▄17467182381678416405150751452414580147571660515221151731516714931153601613916003NA11528NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Liabilities us-gaap:FairValueByMeasurementBasis us-gaap:CarryingReportedAmountFairValueDisclosure██▃▃▁▁▁▂▇▁▁▁▁▃▃▃16526165821501915104143071432214371145051617514285142951430514312148211483514844NA111006569656870186218NANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Liabilities us-gaap:FairValueByMeasurementBasis us-gaap:EstimateOfFairValueFairValueDisclosure▇█▅▅▂▁▁▁▅▂▂▂▂▃▄▄17467182381678416405150751452414580147571660515221151731516714931153601613916003NA115286938694776036723NANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LiabilitiesAndStockholdersEquity █████▇▇▇▇▇▇▇▇▇▇▇▆▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁1731271769431751481745161713471677711676841675341687811670221675781629881609671597861618101602031566441023669776099840983989824897557974479517994510945849368893461925459350890701897498750588720892548622083355NANANA77980NANANA
 us-gaap:LiabilitiesAndStockholdersEquity dei:LegalEntity cb:OtherAceLimitedSubsidiariesAndEliminations█████▇▇█▇██▇▇▇▇▇▇▁187209189152189527187607185896181741181250183981182303185724186047180102178654177586180254178643174453108967NANANA112608NANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LiabilitiesAndStockholdersEquity us-gaap:ConsolidatedEntities srt:GuarantorSubsidiaries▂██▅▅▂▁51349539395409452657527845143250994NANA51621NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LiabilitiesAndStockholdersEquity us-gaap:ConsolidatedEntities srt:ParentCompany▅██▆▄▁▂53284556435554854278530175060951448NANA51554NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:StockholdersEquity ▇███▇▇▇▇▇▇▇▇▆▆▆▆▅▁▁▁5219755331545725380252355503125093450971512875117250471503494922448275483724722645897291352912729555NA29587NANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquity dei:LegalEntity cb:OtherAceLimitedSubsidiariesAndEliminations▇██▇▆▄▄▅▅▄▃▃▃▂▂▁69005702507072069158682976603666139672006711665278647516419964228633036359461982NA30710NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities srt:GuarantorSubsidiaries▆█▇▅▃▁▁31299326793213230797293472770427521NANA27796NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities srt:ParentCompany▄█▇▆▄▁▂52197553315457253802523555031250934NANA51172NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital▅▅▅▅▆▆▆▆▆▇▇▇▇████▁▁▁1071011203114651175712051125571285313150134301397814217145221479515335156011585816140448146654847NA5145NANANA5238NANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:CommonStock█████████████████▁▁▁1112111121111211112111121111211112111121111211112111121111211112111121111211112111121783378337833NA8055NANANA8899NANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:RetainedEarnings██▇▇▇▆▆▆▅▅▄▄▃▃▂▂▂▁▁▁3633136142349693387832728317003149130260289652747425941260112470623613220032064319917194781879518267NA16644NANANA13791NANANANANANANANANANANANANANANANANANANA
  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:CashAndCashEquivalentsAtCarryingValue ▆▆▆▅▅▅▄▃█▂▄▅▄▃▃▃▄▇▄▂▃▂▂▁▃▁▂▂▃▂▂▂▂▂▂▃▄▂▁▂▂▂15121537147812701271124710531000198872810881297106398587010111091177510387909486558065948475797686798556156906177156147668331115772487668726669NANANA
 us-gaap:CashAndCashEquivalentsAtCarryingValue dei:LegalEntity cb:OtherAceLimitedSubsidiariesAndEliminations▆▂█▄▆▅▃▆▄▂▃▃▇▅▆▅▇█▆▃▁▃21931093270616252220189612982238152383911741323232819652158182524062743217712096581209NANANA748NANANA859NANANANANANANANANANANANANANANA
  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:Goodwill █████████████████▁14971152961523015300153281527115332154761568615541157071543415387153321548115525154044796NANANA4904NANANA4603NANANA4319NANANA4180NANANA4030NANANA3814NANANA
us-gaap:IntangibleAssetsNetExcludingGoodwill ▆▆▆▆▆▆▆▆▆▇▇▇▇▇▇▇█▁59026063614862666091614361396283643765136558657966746763699173987955887NANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IntangibleAssetsNetIncludingGoodwill ▇▇▇▇▇▇▇▇███▇█████▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁2087321359213782156621419214142147121759221232205422265220132206122095224722292323359568357135969551657245425552253825404546553954909497549904826NA4799NANANANANANANANANANANA
 us-gaap:IntangibleAssetsNetIncludingGoodwill dei:LegalEntity cb:OtherAceLimitedSubsidiariesAndEliminations▇▇▇▇▇▇▇▇█▇█▇▇▇███▁20873213592137821566214192141421471217592212322054222652201322061220952247222923233595683NANANA5724NANANANANANANANANANANANANANANANANANANANANANANA
  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
  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:LongTermDebt ████▇▇▇▇▇▇▇▇▇▇▇▇▇▅▂▂▂▁▁▁▁▁▁▁▂▁▁▁▁▁▁▁▁▁1351013559132851337112071120871214912184127861155611559116671230012610126211263112636944741574157415733574057405738083807380738074307336033603360336033603360336033583358NANANA3158NANANA
  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:StockholdersEquity ▇███▇▇▇▇▇▇▇▇▆▆▆▆▅▁▁▁5219755331545725380252355503125093450971512875117250471503494922448275483724722645897291352912729555NA29587NANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquity dei:LegalEntity cb:OtherAceLimitedSubsidiariesAndEliminations▇██▇▆▄▄▅▅▄▃▃▃▂▂▁69005702507072069158682976603666139672006711665278647516419964228633036359461982NA30710NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities srt:GuarantorSubsidiaries▆█▇▅▃▁▁31299326793213230797293472770427521NANA27796NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities srt:ParentCompany▄█▇▆▄▁▂52197553315457253802523555031250934NANA51172NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital▅▅▅▅▆▆▆▆▆▇▇▇▇████▁▁▁1071011203114651175712051125571285313150134301397814217145221479515335156011585816140448146654847NA5145NANANA5238NANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:CommonStock█████████████████▁▁▁1112111121111211112111121111211112111121111211112111121111211112111121111211112111121783378337833NA8055NANANA8899NANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:RetainedEarnings██▇▇▇▆▆▆▅▅▄▄▃▃▂▂▂▁▁▁3633136142349693387832728317003149130260289652747425941260112470623613220032064319917194781879518267NA16644NANANA13791NANANANANANANANANANANANANANANANANANANA
us-gaap:CommonStockValue █████████████████▁▁▁▁▁▂▂▃▃▄▄▄▅▅▅▆▆▆▆▆▆1112111121111211112111121111211112111121111211112111121111211112111121111211112111121783378337833783380558278850187248899907392499423959197599927100951009510095100981007510161NANANA10503NANANA
us-gaap:RetainedEarningsAccumulatedDeficit ███▇▇▇▇▇▆▆▆▆▅▅▅▄▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▁▁▁▁▁36331361423496933878327283170031491302602896527474259412601124706236132200320643199171947818795182671732516644160891530414525137911279311877109861003392688628830075116761679261855926NANANA2818NANANA
us-gaap:TreasuryStockValue ██▇▇▆▆▅▅▄▄▄▄▃▃▄▄▄▄▄▄▄▃▃▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁38723754350430932775261823722040172719441877167513981480155015771648192219741999164514481057630443255222219212159187206227327350250251330NANANA3NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▁▅▅▄▃▁▁▂▃▅▆▅▄▄▆▆▅▃▄▅▆▆▆▇▆▆▆▆███▇▇▇▆▇▆▆-2093619521139-770-2448-2159-1520-50254310693700-31411971181367-735-192607115211911608209515261152137412602650288730142338220919111839198917821594NANANA823NANANA
  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 █▁17121429NANA13221583NANANANANANANANANANA102011658088161075127411268461250NANANA913NANANA572NANA10601003NANA868823NANANANA
 us-gaap:NetCashProvidedByUsedInOperatingActivities dei:LegalEntity cb:OtherAceLimitedSubsidiariesAndEliminations█▁17951644NANA13782081NANANANANANANANANANA1011NANANA1023NANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetCashProvidedByUsedInInvestingActivities █▁-1010-2344NANA-673-808NANANANANANANANANANA-1615-4869-4050-1020-816-229-956-503NANANA-1466NANANA-615NANA-1268-631NANA-801-666NANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities us-gaap:ConsolidatedEntities srt:GuarantorSubsidiaries█▁860-798NANA-150-54NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities us-gaap:ConsolidationItems srt:ConsolidationEliminations█▁12000NANA110400NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁█-645973NANA-630-567NANANANANANANANANANA-1024472-118-992333-537-615-153-472NANANA813NANANA139NANA-78-37NANA-98-93NANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity cb:OtherAceLimitedSubsidiariesAndEliminations█▁1256-1713NANA-426-664NANANANANANANANANANA-3910NANANA-243NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidatedEntities srt:ParentCompany█▁114410NANA-306331NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  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 █▁17121429NANA13221583NANANANANANANANANANA102011658088161075127411268461250NANANA913NANANA572NANA10601003NANA868823NANANANA
 us-gaap:NetCashProvidedByUsedInOperatingActivities dei:LegalEntity cb:OtherAceLimitedSubsidiariesAndEliminations█▁17951644NANA13782081NANANANANANANANANANA1011NANANA1023NANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss ▂▆▆▆▆▃▆▇▆█▁▇▆█▇▄▃▄▃▅▄▄▅▅▄▅▅▅▅▄▄▃▅▄▁▄▂▅▄▄▄▅▃▄▄25211731091115010403551231129410821533-701305109316101360726439683528942681555785779734998916891953765640328973750-316072591001675677755953494535567
 us-gaap:NetIncomeLoss dei:LegalEntity cb:OtherAceLimitedSubsidiariesAndEliminations264NA111812621140NA125813581223NA2313871224NA1423867619505538948693NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:ConsolidatedEntities srt:GuarantorSubsidiaries585NA759604609NA628337684NA62NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:ConsolidatedEntities srt:ParentCompany▂▆▆▆▆▃▇▇▆█▁25211731091115010403551231129410821533-70NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▂▆▆▆▆▃▆▇▆█▁▇▆█▇▄▃▄▃▅▄▄▅▅▄25211731091115010403551231129410821533-701305109316101360726439683528942681555785779734NANANA953NANANA973NANA607259NANA677755NANANANA
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet ▄▂▅▅▆▂█▅▄▃▅▆▃▁▅▇▃▁▆▄▅▂▅▅▅-140-46415368205-354579142-16-26795228-238-56096466-289-530194-5477-3861595721NANANA94NANANA55NANA-83-159NANA-331-146NANANANA
  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 █▁-1010-2344NANA-673-808NANANANANANANANANANA-1615-4869-4050-1020-816-229-956-503NANANA-1466NANANA-615NANA-1268-631NANA-801-666NANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities us-gaap:ConsolidatedEntities srt:GuarantorSubsidiaries█▁860-798NANA-150-54NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities us-gaap:ConsolidationItems srt:ConsolidationEliminations█▁12000NANA110400NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  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 ▁█-645973NANA-630-567NANANANANANANANANANA-1024472-118-992333-537-615-153-472NANANA813NANANA139NANA-78-37NANA-98-93NANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity cb:OtherAceLimitedSubsidiariesAndEliminations█▁1256-1713NANA-426-664NANANANANANANANANANA-3910NANANA-243NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidatedEntities srt:ParentCompany█▁114410NANA-306331NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PaymentsForRepurchaseOfCommonStock ▆▆█▇▆▆▇▆▁▂▄▆▃3233274623743673123853182994232347128NA00008403347422450222335NANANA154NANANA11NANA068NANANANANANANANA
 us-gaap:PaymentsForRepurchaseOfCommonStock us-gaap:ConsolidatedEntities srt:ParentCompany██▁▁▁▁▁▁▁▁32332700000000NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  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

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
Value111211112111121111211112111121111211112111121111211112111121111211112111121111211112178337833783378338055827885018724889990739249942395919759992710095100951009510098100751016110503
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 Assets6.46.36.36.46.56.66.66.66.66.76.66.86.97.06.96.97.17.78.07.88.08.28.58.79.29.49.69.910.110.410.410.911.211.511.411.311.712.213.5

Common Stock Par Or Stated Value Per Share

us-gaap:CommonStockParOrStatedValuePerShare



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value24.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.7725.426.0126.5927.0427.4927.9528.4328.8929.3429.7930.2730.2730.2730.2730.2730.57
Percentage of CommonStockParOrStatedValuePerShare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value479479479479479479479479479479479479479479479479479342342342342342342342342342342342342342342342342342342342341341337335329
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value451451453456458459461463465463464465467465465465464324324323327328332336337339340340340340339339338336336337337334336333
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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
Value454458460461466468469466471472471471450327328331337341342343344343342342341338341339341341339
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
Value451454457458462465465466467468468467446324325328334337338340341340340339338338338337340339338
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
Value0.562.592.42.522.270.772.662.782.323.29-0.152.792.333.442.91.550.982.11.632.892.081.682.352.32.162.932.682.612.82.241.880.962.872.22-0.091.790.772.941.981.992.232.821.461.581.69
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
Value0.552.572.382.52.250.762.642.762.33.27-0.152.772.313.412.881.540.972.081.622.862.051.662.322.282.142.92.662.592.772.221.860.962.842.2-0.091.770.762.921.971.982.222.811.461.581.69
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
Value769787389045852778767626875085107831801586108108751081688527789768774679487150484389473752004815441950745172470543104687513839264185447942944253380844093888376039494272368135473575
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

Premiums Earned Net

us-gaap:PremiumsEarnedNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value779479358327789171377465790876647027721878077237677270597688740565974207471943603927437047544332397043634610406735733848466537833381383144903757330935723422323332773387339332663194
Percentage of PremiumsEarnedNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues101.390.892.192.590.697.990.490.189.790.190.789.390.286.490.293.895.989.996.986.489.592.391.490.089.886.089.186.482.982.190.896.480.885.5104.688.386.981.088.086.083.079.392.292.189.3

Net Investment Income

us-gaap:NetInvestmentIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value861858873859836848823828806797813770745744739708674532549562551
Percentage of NetInvestmentIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues11.29.89.710.110.611.19.49.710.39.99.49.59.99.18.79.09.811.411.311.112.6

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-30
Value859875864839818822800809764742736704669547562
Percentage of NetInvestmentIncome99.8100.2100.6100.499.499.399.399.599.299.699.699.499.399.6100.0
Percentage of Revenues11.29.710.110.79.39.710.29.49.49.98.68.99.711.211.1
Percentage of Revenues cb:OtherAceLimitedSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value4-3-6-43543
Percentage of NetInvestmentIncome0.5-0.3-0.7-0.50.40.60.50.4
Percentage of Revenues0.1-0.0-0.1-0.10.00.10.10.0
Percentage of Revenues srt:GuarantorSubsidiaries0.00.00.00.00.00.00.00.0

srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-2-2111121211
Percentage of NetInvestmentIncome-0.2-0.20.10.10.10.10.20.10.20.10.1
Percentage of Revenues-0.0-0.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues srt:ParentCompany0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementBusinessSegments

cb:SegmentGlobalReinsurance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value545455555665636564
Percentage of NetInvestmentIncome6.36.36.36.46.77.77.77.97.9
Percentage of Revenues0.70.60.60.60.70.90.70.80.8
Percentage of Revenues cb:SegmentGlobalReinsurance0.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceNorthAmericanAgriculture



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value988410876776665555656
Percentage of NetInvestmentIncome1.00.90.90.51.20.90.90.70.90.90.70.80.80.70.70.70.71.10.91.1
Percentage of Revenues0.10.10.10.00.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of Revenues cb:SegmentInsuranceNorthAmericanAgriculture0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceNorthAmericanCommercialPCMemberMember



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-30
Value516532521510503510503497490478477468426260262
Percentage of NetInvestmentIncome59.960.960.761.061.161.662.461.163.664.264.566.163.247.446.6
Percentage of Revenues6.75.96.16.55.76.06.45.86.06.45.65.96.25.35.2
Percentage of Revenues cb:SegmentInsuranceNorthAmericanCommercialPCMemberMember0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceNorthAmericanPersonalPCMember



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value6664666464595959595857565552535547677
Percentage of NetInvestmentIncome7.77.57.67.57.77.07.27.17.37.37.07.37.47.07.27.87.01.11.31.2
Percentage of Revenues0.90.70.70.80.80.80.70.70.80.70.70.70.70.60.60.70.70.10.10.1
Percentage of Revenues cb:SegmentInsuranceNorthAmericanPersonalPCMember0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceOverseasGeneral



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value145145148151144158155155151150164148148155152147146125132139
Percentage of NetInvestmentIncome16.816.917.017.617.218.618.818.718.718.820.219.219.920.820.620.821.723.524.024.7
Percentage of Revenues1.91.71.61.81.82.11.81.81.91.91.91.82.01.91.81.92.12.72.72.8
Percentage of Revenues cb:SegmentInsuranceOverseasGeneral0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentLife



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value9595929789888585838378777576716967676666
Percentage of NetInvestmentIncome11.011.110.511.310.610.410.310.310.310.49.610.010.110.29.69.79.912.612.011.7
Percentage of Revenues1.21.11.01.11.11.21.01.01.11.00.90.91.00.90.80.91.01.41.41.3
Percentage of Revenues cb:SegmentLife0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Corporate



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-24-28-33-37-49-52-61-69-72-79
Percentage of NetInvestmentIncome-2.8-3.2-3.8-4.4-6.0-6.3-7.6-8.5-9.4-10.6
Percentage of Revenues-0.3-0.3-0.4-0.5-0.6-0.6-0.8-0.8-0.9-1.1
Percentage of Revenues us-gaap:Corporate0.00.00.00.00.00.00.00.00.00.0

Realized Investment Gains Losses

us-gaap:InvestmentType

us-gaap:RealizedInvestmentGainsLosses

cb:Equitysecuritiesandotherinvestments



Period End2020-03-312019-03-31
Value-2414
Percentage of RealizedInvestmentGainsLosses100.0100.0
Percentage of Revenues-0.30.2
Percentage of Revenues cb:Equitysecuritiesandotherinvestments0.00.0

us-gaap:OtherInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-06-302017-03-31
Value5-2-430-44-285-112900
Percentage of RealizedInvestmentGainsLosses-20.80.00.00.0-314.30.00.00.00.00.00.0
Percentage of Revenues0.1-0.0-0.00.4-0.6-0.40.1-0.10.40.00.0
Percentage of Revenues us-gaap:OtherInvestments0.00.00.00.00.00.00.00.00.00.00.0

Policyholder Benefits And Claims Incurred Net

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value448548655052471540984610486844874102427262474146378938554269425436742302264324172122241626842388216125172655225019262683304721191804228627452226226319711887180019211900188518211816
Percentage of PolicyholderBenefitsAndClaimsIncurredNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues58.355.755.955.352.060.555.652.752.453.372.651.150.547.250.153.953.449.254.347.948.351.051.649.648.949.651.347.844.757.259.354.043.151.063.952.359.444.748.547.948.644.551.251.350.8

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value44855052471540984868448741026247414637894269425436742302264324172122
Percentage of PolicyholderBenefitsAndClaimsIncurredNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues58.355.955.352.055.652.752.472.651.150.550.153.953.449.254.347.948.3
Percentage of Revenues cb:OtherAceLimitedSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementBusinessSegments

cb:SegmentGlobalReinsurance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value87107799076243868367
Percentage of PolicyholderBenefitsAndClaimsIncurredNet1.92.21.61.91.95.31.81.81.6
Percentage of Revenues1.11.20.91.11.03.21.01.00.9
Percentage of Revenues cb:SegmentGlobalReinsurance0.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceNorthAmericanAgriculture



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value63453866316-27156719289-5360759290-73-44683284-3017562027122
Percentage of PolicyholderBenefitsAndClaimsIncurredNet1.49.317.16.7-0.73.414.86.4-1.31.412.17.0-1.9-1.116.06.7-0.87.623.511.21.0
Percentage of Revenues0.85.29.63.7-0.32.08.23.4-0.70.78.83.6-1.0-0.58.03.6-0.43.712.75.40.5
Percentage of Revenues cb:SegmentInsuranceNorthAmericanAgriculture0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceNorthAmericanCommercialPCMemberMember



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
Value2181205122141973188120841908258019361860186319711747913916915
Percentage of PolicyholderBenefitsAndClaimsIncurredNet48.640.647.048.138.646.446.541.346.749.143.646.347.634.537.943.1
Percentage of Revenues28.322.726.025.121.524.524.430.023.924.821.825.025.418.718.120.8
Percentage of Revenues cb:SegmentInsuranceNorthAmericanCommercialPCMemberMember0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceNorthAmericanPersonalPCMember



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value6838656747477577558607288868871062683633642594661661144179156111
Percentage of PolicyholderBenefitsAndClaimsIncurredNet15.217.813.315.818.516.417.716.221.620.817.016.516.716.713.915.518.06.36.86.55.2
Percentage of Revenues8.99.97.58.89.69.99.88.611.311.112.38.48.47.97.08.49.63.13.73.12.5
Percentage of Revenues cb:SegmentInsuranceNorthAmericanPersonalPCMember0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceOverseasGeneral



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value12581221115411251106116611141071107896512819641071105284310891021748674816814
Percentage of PolicyholderBenefitsAndClaimsIncurredNet28.025.122.823.927.025.322.923.926.322.620.523.328.327.319.725.627.832.525.533.838.4
Percentage of Revenues16.314.012.813.214.015.312.712.613.812.014.911.914.312.99.913.814.816.013.816.218.5
Percentage of Revenues cb:SegmentInsuranceOverseasGeneral0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentLife



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value202176190189202182195184205183181182193165174147177159153137152
Percentage of PolicyholderBenefitsAndClaimsIncurredNet4.53.63.84.04.93.94.04.15.04.32.94.45.14.34.13.54.86.95.85.77.2
Percentage of Revenues2.62.02.12.22.62.42.22.22.62.32.12.22.62.02.01.92.63.43.12.73.5
Percentage of Revenues cb:SegmentLife0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Corporate



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value11383411134811894511
Percentage of PolicyholderBenefitsAndClaimsIncurredNet0.20.80.70.30.31.10.31.41.10.3
Percentage of Revenues0.10.40.40.10.10.60.11.00.60.1
Percentage of Revenues us-gaap:Corporate0.00.00.00.00.00.00.00.00.00.0

Deferred Policy Acquisition Cost Amortization Expense

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value16151542160315441464148015041464146414471488144913971417151415601413736771727707764825758728678665614609619582666604555607536554
Percentage of DeferredPolicyAcquisitionCostAmortizationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues21.017.617.718.118.619.417.217.218.718.117.317.918.617.317.819.820.515.715.814.416.116.115.915.716.513.114.114.211.915.813.915.514.214.615.614.314.0

us-gaap:StatementBusinessSegments

cb:SegmentGlobalReinsurance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value454242424342404040
Percentage of DeferredPolicyAcquisitionCostAmortizationExpense2.82.72.62.72.92.82.72.72.7
Percentage of Revenues0.60.50.50.50.50.60.50.50.5
Percentage of Revenues cb:SegmentGlobalReinsurance0.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceNorthAmericanAgriculture



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value11-65627754926-164927-164825484223-4
Percentage of DeferredPolicyAcquisitionCostAmortizationExpense0.7-0.43.51.70.50.33.31.8-0.10.43.31.9-0.10.43.21.60.31.15.43.2-0.6
Percentage of Revenues0.1-0.10.60.30.10.10.60.3-0.00.10.60.3-0.00.10.60.30.10.20.90.5-0.1
Percentage of Revenues cb:SegmentInsuranceNorthAmericanAgriculture0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceNorthAmericanCommercialPCMemberMember



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
Value492459459459458448472469464487522545482142131130
Percentage of DeferredPolicyAcquisitionCostAmortizationExpense30.528.629.731.430.530.632.231.532.034.934.534.934.118.418.018.4
Percentage of Revenues6.45.15.45.85.25.36.05.45.76.56.16.97.02.92.63.0
Percentage of Revenues cb:SegmentInsuranceNorthAmericanCommercialPCMemberMember0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceNorthAmericanPersonalPCMember



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2452402402372312382362282372262262302172192292692492613-131
Percentage of DeferredPolicyAcquisitionCostAmortizationExpense15.215.615.015.315.816.115.715.616.215.615.215.915.515.515.117.217.63.51.7-0.14.4
Percentage of Revenues3.22.72.72.82.93.12.72.73.02.82.62.82.92.72.73.43.60.60.3-0.00.7
Percentage of Revenues cb:SegmentInsuranceNorthAmericanPersonalPCMember0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceOverseasGeneral



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value642646630629596592582584588568569555529550546537503391405396389
Percentage of DeferredPolicyAcquisitionCostAmortizationExpense39.841.939.340.740.740.038.739.940.239.338.238.337.938.836.134.435.653.152.554.555.0
Percentage of Revenues8.37.47.07.47.67.86.76.97.57.16.66.87.06.76.46.87.38.48.37.88.9
Percentage of Revenues cb:SegmentInsuranceOverseasGeneral0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentLife



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value180166176150128152139138128154132130114123127137122134117118107
Percentage of DeferredPolicyAcquisitionCostAmortizationExpense11.110.811.09.78.710.39.29.48.710.68.99.08.28.78.48.88.618.215.216.215.1
Percentage of Revenues2.31.91.91.81.62.01.61.61.61.91.51.61.51.51.51.71.82.92.42.32.4
Percentage of Revenues cb:SegmentLife0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value741810752758710728719747692737714706676708772829772570568578554590554566535563564514519514510517515494433463460
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues9.69.38.38.99.09.58.28.88.89.28.38.79.08.79.110.511.212.211.711.512.612.510.711.812.110.912.011.910.113.112.212.012.113.011.112.311.6

us-gaap:StatementBusinessSegments

cb:SegmentGlobalReinsurance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value10997101210910
Percentage of GeneralAndAdministrativeExpense1.31.11.20.91.41.61.41.21.4
Percentage of Revenues0.10.10.10.10.10.20.10.10.1
Percentage of Revenues cb:SegmentGlobalReinsurance0.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceNorthAmericanAgriculture



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value4-3441-921-3-4-12-5-512-4-204-1
Percentage of GeneralAndAdministrativeExpense0.5-0.40.50.50.1-1.20.30.1-0.4-0.5-0.10.3-0.7-0.70.10.2-0.5-0.40.00.7-0.2
Percentage of Revenues0.1-0.00.00.00.0-0.10.00.0-0.0-0.0-0.00.0-0.1-0.10.00.0-0.1-0.00.00.1-0.0
Percentage of Revenues cb:SegmentInsuranceNorthAmericanAgriculture0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceNorthAmericanCommercialPCMemberMember



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
Value259256259240251253231256241231275299266154154151
Percentage of GeneralAndAdministrativeExpense35.034.034.233.834.933.933.435.934.134.235.636.134.527.126.627.3
Percentage of Revenues3.42.83.03.02.93.02.93.03.03.13.23.83.93.23.13.4
Percentage of Revenues cb:SegmentInsuranceNorthAmericanCommercialPCMemberMember0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceNorthAmericanPersonalPCMember



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value687572716867696865726166658889988834363419
Percentage of GeneralAndAdministrativeExpense9.29.39.69.49.69.29.69.19.49.88.59.39.612.411.511.811.46.06.35.93.4
Percentage of Revenues0.90.90.80.80.90.90.80.80.80.90.70.80.91.11.01.21.30.70.70.70.4
Percentage of Revenues cb:SegmentInsuranceNorthAmericanPersonalPCMember0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceOverseasGeneral



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value258262257265249257252266239248246243245256261277263241246254256
Percentage of GeneralAndAdministrativeExpense34.832.334.235.035.135.335.035.634.533.634.534.436.236.233.833.434.142.343.343.946.2
Percentage of Revenues3.43.02.83.13.23.42.93.13.13.12.93.03.33.13.13.53.85.25.15.05.8
Percentage of Revenues cb:SegmentInsuranceOverseasGeneral0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentLife



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value768680787975778078777777728177777270747473
Percentage of GeneralAndAdministrativeExpense10.310.610.610.311.110.310.710.711.310.410.810.910.711.410.09.39.312.313.012.813.2
Percentage of Revenues1.01.00.90.91.01.00.90.91.01.00.90.91.01.00.91.01.01.51.51.51.7
Percentage of Revenues cb:SegmentLife0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Corporate



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value66747463587072646558
Percentage of GeneralAndAdministrativeExpense8.99.89.88.98.19.410.49.09.28.6
Percentage of Revenues0.90.80.90.80.70.80.90.70.80.8
Percentage of Revenues us-gaap:Corporate0.00.00.00.00.00.00.00.00.00.0

Interest Expense

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value46713421321135812285141414151212171151-15515051221186916378815637506601085801
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues6.115.414.615.915.66.716.217.815.514.4-1.818.616.322.919.211.28.216.013.521.518.3

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value215169230208188159183218135-382-85200128259277155124671321431202321761339315511512214714811016512297160142124
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues2.81.92.52.42.42.12.12.61.7-4.8-1.02.51.73.23.22.01.81.42.72.82.74.93.42.82.13.02.42.82.93.82.63.82.92.54.13.83.1

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value208260248226202249189-2283234407187268328159165143
Percentage of IncomeTaxExpenseBenefit96.7113.0119.2120.2110.4114.2140.02.4141.5182.8146.9120.6216.1489.6120.5115.4119.2
Percentage of Revenues2.72.92.92.92.32.92.4-0.03.53.14.82.43.97.03.33.33.3
Percentage of Revenues cb:OtherAceLimitedSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value7-33-45-42-24-36-59-89
Percentage of IncomeTaxExpenseBenefit3.3-14.3-21.6-22.3-13.1-16.5-43.7104.7
Percentage of Revenues0.1-0.4-0.5-0.5-0.3-0.4-0.8-1.0
Percentage of Revenues srt:GuarantorSubsidiaries0.00.00.00.00.00.00.00.0

srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value02354455546
Percentage of IncomeTaxExpenseBenefit0.01.21.32.42.12.52.72.33.7-1.0-7.1
Percentage of Revenues0.00.00.00.10.10.10.10.10.10.00.1
Percentage of Revenues srt:ParentCompany0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementBusinessSegments

us-gaap:Corporate



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value215230208188183218135-85200128
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues2.82.52.42.42.12.61.7-1.02.51.7
Percentage of Revenues us-gaap:Corporate0.00.00.00.00.00.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value25211731091115010403551231129410821533-701305109316101360726439683528942681555785779734998916891953765640328973750-316072591001675677755953494535567
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues3.313.412.113.513.24.714.115.213.819.1-0.816.114.619.715.99.26.414.610.818.715.511.715.116.216.619.717.718.922.116.312.58.423.216.7-0.714.36.822.717.418.019.122.313.415.115.9

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value26411181262114012581358122323138712241423867619505538948693
Percentage of NetIncomeLoss104.8102.5109.7109.6102.2104.9113.0-32.9106.3112.0104.6119.4141.073.9101.9100.6101.8
Percentage of Revenues3.412.414.814.514.416.015.60.317.116.316.711.09.010.811.018.815.8
Percentage of Revenues cb:OtherAceLimitedSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value58575960460962833768462
Percentage of NetIncomeLoss232.169.652.558.651.026.063.2-88.6
Percentage of Revenues7.68.47.17.77.24.08.70.7
Percentage of Revenues srt:GuarantorSubsidiaries0.00.00.00.00.00.00.00.0

srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value25211731091115010403551231129410821533-70
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues3.313.412.113.513.24.714.115.213.819.1-0.8
Percentage of Revenues srt:ParentCompany0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-849-1837-1877-1866-1749-843-1886-1695-1907-2333-85
Percentage of NetIncomeLoss-336.9-156.6-172.0-162.3-168.2-237.5-153.2-131.0-176.2-152.2121.4
Percentage of Revenues-11.0-21.0-20.8-21.9-22.2-11.1-21.6-19.9-24.4-29.1-1.0
Percentage of Revenues srt:ConsolidationEliminations0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementBusinessSegments

us-gaap:Corporate



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-1479-685-555-605-384-520-475-305-413-545
Percentage of NetIncomeLoss-586.9-62.8-48.3-58.2-31.2-40.2-43.9435.7-31.6-49.9
Percentage of Revenues-19.2-7.6-6.5-7.7-4.4-6.1-6.1-3.5-5.1-7.3
Percentage of Revenues us-gaap:Corporate0.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-06-302010-03-31
Value25211731091115010403551231129410821533-701305109316101360726439683528942681555785779734953973607259677755
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues3.313.412.113.513.24.714.115.213.819.1-0.816.114.619.715.99.26.414.610.818.715.511.715.116.216.622.123.214.36.818.019.1
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets

us-gaap:Assets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value173127176943175148174516171347167771167684167534168781167022167578162988160967159786161810160203156644102366977609984098398982489755797447951799451094584936889346192545935089070189749875058872089254862208335577980
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

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value187209189152189527187607185896181741181250183981182303185724186047180102178654177586180254178643174453108967112608
Percentage of Assets108.1106.9108.2107.5108.5108.3108.1109.8108.0111.2111.0110.5111.0111.1111.4111.5111.4106.4114.6
Percentage of Assets108.1106.9108.2107.5108.5108.3108.1109.8108.0111.2111.0110.5111.0111.1111.4111.5111.4106.4114.6
Percentage of Assets cb:OtherAceLimitedSubsidiariesAndEliminations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value5134953939540945265752784514325099451621
Percentage of Assets29.730.530.930.230.830.730.430.9
Percentage of Assets29.730.530.930.230.830.730.430.9
Percentage of Assets srt:GuarantorSubsidiaries100.0100.0100.0100.0100.0100.0100.0100.0

srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value5328455643555485427853017506095144851554
Percentage of Assets30.831.431.731.130.930.230.730.9
Percentage of Assets30.831.431.731.130.930.230.730.9
Percentage of Assets srt:ParentCompany100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-118715-121791-124021-120026-120350-116011-116008-121877
Percentage of Assets-68.6-68.8-70.8-68.8-70.2-69.1-69.2-73.0
Percentage of Assets-68.6-68.8-70.8-68.8-70.2-69.1-69.2-73.0
Percentage of Assets srt:ConsolidationEliminations100.0100.0100.0100.0100.0100.0100.0100.0

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
Value12093012161212057612071411899211745911675011656311749411585011710711263911174311151111343811297711074773231686337028568696686616754067122658106568566366663936551965014665456493964318629896497065141628446038158313
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 Assets69.968.768.869.269.470.069.669.669.669.469.969.169.469.870.170.570.771.570.270.469.869.969.268.969.169.570.270.970.170.371.271.671.772.073.273.072.972.474.8

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value1182041189021188071184491175991157051151111167811151871204461212961159031144261142831166601166611131707825776693
Percentage of Liabilities97.797.898.598.198.898.598.6100.298.0104.0103.6102.9102.4102.5102.8103.3102.2106.9111.7
Percentage of Assets68.367.267.867.968.669.068.669.768.272.172.471.171.171.572.172.872.276.478.1
Percentage of Assets cb:OtherAceLimitedSubsidiariesAndEliminations63.162.962.763.163.363.763.563.563.264.965.264.464.064.464.765.364.971.868.1

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value2005021260219622186023437237282347323825
Percentage of Liabilities16.617.518.218.119.720.220.120.6
Percentage of Assets11.612.012.512.513.714.114.014.3
Percentage of Assets srt:GuarantorSubsidiaries39.039.440.641.544.446.146.046.2

srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value1087312976476662297514382
Percentage of Liabilities0.90.30.80.40.60.30.40.3
Percentage of Assets0.60.20.60.30.40.20.30.2
Percentage of Assets srt:ParentCompany2.00.61.80.91.20.61.00.7

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-18411-18862-21169-20071-22706-22271-22348-28803
Percentage of Liabilities-15.2-15.5-17.6-16.6-19.1-19.0-19.1-24.9
Percentage of Assets-10.6-10.7-12.1-11.5-13.3-13.3-13.3-17.2
Percentage of Assets srt:ConsolidationEliminations15.515.517.116.718.919.219.323.6

us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel2



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value1746718238167841640515075145241458014757166051522115173151671493115360161391600311528
Percentage of Liabilities14.415.013.913.612.712.412.512.714.113.113.013.513.413.814.214.215.7
Percentage of Assets10.110.39.69.48.88.78.78.89.89.19.19.39.39.610.010.011.3
Percentage of Assets us-gaap:FairValueInputsLevel20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-31
Value16526165821501915104143071432214371145051617514285142951430514312148211483514844111006569656870186218
Percentage of Liabilities13.713.612.512.512.012.212.312.413.812.312.212.712.813.313.113.115.29.69.310.29.1
Percentage of Assets9.59.48.68.78.38.58.68.79.68.68.58.88.99.39.29.310.86.76.67.16.3
Percentage of Assets us-gaap:CarryingReportedAmountFairValueDisclosure0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.076.770.592.779.4

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-31
Value17467182381678416405150751452414580147571660515221151731516714931153601613916003115286938694776036723
Percentage of Liabilities14.415.013.913.612.712.412.512.714.113.113.013.513.413.814.214.215.710.19.911.19.8
Percentage of Assets10.110.39.69.48.88.78.78.89.89.19.19.39.39.610.010.011.37.17.07.76.8
Percentage of Assets us-gaap:EstimateOfFairValueFairValueDisclosure0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.079.373.696.383.1

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
Value173127176943175148174516171347167771167684167534168781167022167578162988160967159786161810160203156644102366977609984098398982489755797447951799451094584936889346192545935089070189749875058872089254862208335577980
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

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value187209189152189527187607185896181741181250183981182303185724186047180102178654177586180254178643174453108967112608
Percentage of LiabilitiesAndStockholdersEquity108.1106.9108.2107.5108.5108.3108.1109.8108.0111.2111.0110.5111.0111.1111.4111.5111.4106.4114.6
Percentage of Assets108.1106.9108.2107.5108.5108.3108.1109.8108.0111.2111.0110.5111.0111.1111.4111.5111.4106.4114.6
Percentage of Assets cb:OtherAceLimitedSubsidiariesAndEliminations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value5134953939540945265752784514325099451621
Percentage of LiabilitiesAndStockholdersEquity29.730.530.930.230.830.730.430.9
Percentage of Assets29.730.530.930.230.830.730.430.9
Percentage of Assets srt:GuarantorSubsidiaries100.0100.0100.0100.0100.0100.0100.0100.0

srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value5328455643555485427853017506095144851554
Percentage of LiabilitiesAndStockholdersEquity30.831.431.731.130.930.230.730.9
Percentage of Assets30.831.431.731.130.930.230.730.9
Percentage of Assets srt:ParentCompany100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-118715-121791-124021-120026-120350-116011-116008-121877
Percentage of LiabilitiesAndStockholdersEquity-68.6-68.8-70.8-68.8-70.2-69.1-69.2-73.0
Percentage of Assets-68.6-68.8-70.8-68.8-70.2-69.1-69.2-73.0
Percentage of Assets srt:ConsolidationEliminations100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value521975533154572538025235550312509345097151287511725047150349492244827548372472264589729135291272955529587
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets30.131.331.230.830.630.030.430.430.430.630.130.930.630.229.929.529.328.529.829.630.1

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value6900570250707206915868297660366613967200671166527864751641996422863303635946198230710
Percentage of StockholdersEquity132.2127.0129.6128.5130.4131.3129.9131.8130.9127.6128.3127.5130.5131.1131.5131.2105.4
Percentage of Assets39.939.740.439.639.939.439.440.139.839.138.639.439.939.639.338.730.0
Percentage of Assets cb:OtherAceLimitedSubsidiariesAndEliminations36.937.137.336.936.736.336.536.536.835.134.835.636.035.635.334.728.2

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value3129932679321323079729347277042752127796
Percentage of StockholdersEquity60.059.158.957.256.155.154.054.3
Percentage of Assets18.118.518.317.617.116.516.416.6
Percentage of Assets srt:GuarantorSubsidiaries61.060.659.458.555.653.954.053.8

srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value5219755331545725380252355503125093451172
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets30.131.331.230.830.630.030.430.6
Percentage of Assets srt:ParentCompany98.099.498.299.198.899.499.099.3

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-100304-102929-102852-99955-97644-93740-93660-93074
Percentage of StockholdersEquity-192.2-186.0-188.5-185.8-186.5-186.3-183.9-181.9
Percentage of Assets-57.9-58.2-58.7-57.3-57.0-55.9-55.9-55.7
Percentage of Assets srt:ConsolidationEliminations84.584.582.983.381.180.880.776.4

us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value41524375273231249261280202253267291-62-66-69-70-71-74-79-85
Percentage of StockholdersEquity0.00.00.00.10.10.10.50.50.50.50.40.50.50.6-0.1-0.1-0.2-0.2-0.2-0.3-0.30.0
Percentage of Assets0.00.00.00.00.00.00.10.10.20.20.10.20.20.2-0.0-0.0-0.0-0.1-0.1-0.1-0.1-0.1
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value6672543261320331014-545-549-39046145016431551126510582547240416988741285154018511174
Percentage of StockholdersEquity1.34.64.83.81.9-1.1-1.1-0.80.12.83.33.12.62.25.35.13.73.04.45.26.30.0
Percentage of Assets0.41.41.51.20.6-0.3-0.3-0.20.00.91.01.00.80.71.61.51.10.91.31.51.91.2
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value-2093619521139-770-2448-2159-1520-50254310693700-31411971181367-735-1926071191
Percentage of StockholdersEquity-4.01.11.00.3-1.5-4.9-4.2-3.0-1.01.12.10.70.0-0.72.52.50.8-2.5-0.72.14.0
Percentage of Assets-1.20.30.30.1-0.4-1.5-1.3-0.9-0.30.30.60.20.0-0.20.70.70.2-0.7-0.20.61.2
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value-2764-1939-2116-1931-1836-1976-1841-1379-809-1187-776-1434-1532-1663-1288-1157-1262-1539-1406-859-58163
Percentage of StockholdersEquity-5.3-3.5-3.9-3.6-3.5-3.9-3.6-2.7-1.6-2.3-1.5-2.8-3.1-3.4-2.7-2.4-2.7-5.3-4.8-2.9-2.00.0
Percentage of Assets-1.6-1.1-1.2-1.1-1.1-1.2-1.1-0.8-0.5-0.7-0.5-0.9-1.0-1.0-0.8-0.7-0.8-1.5-1.4-0.9-0.60.1
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value107101120311465117571205112557128531315013430139781421714522147951533515601158581614044814665484751455238
Percentage of StockholdersEquity20.520.221.021.923.025.025.225.826.227.328.228.830.131.832.333.635.215.416.016.417.40.0
Percentage of Assets6.26.36.56.77.07.57.77.88.08.48.58.99.29.69.69.910.34.44.84.95.25.5
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value111211112111121111211112111121111211112111121111211112111121111211112111121111211112178337833783380558899
Percentage of StockholdersEquity21.320.120.420.721.222.121.821.821.721.722.022.122.623.023.023.524.226.926.926.527.20.0
Percentage of Assets6.46.36.36.46.56.66.66.66.66.76.66.86.97.06.96.97.17.78.07.88.29.4
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value36331361423496933878327283170031491302602896527474259412601124706236132200320643199171947818795182671664413791
Percentage of StockholdersEquity69.665.364.163.062.563.061.859.456.553.751.451.750.248.945.543.743.466.964.561.856.30.0
Percentage of Assets21.020.420.019.419.118.918.818.117.216.415.516.015.314.813.612.912.719.019.218.316.914.6
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value-3872-3754-3504-3093-2775-2618-2372-2040-1727-1944-1877-1675-1398-1480-1550-1577-1648-1922-1974-1999-1448-255
Percentage of StockholdersEquity-7.4-6.8-6.4-5.7-5.3-5.2-4.7-4.0-3.4-3.8-3.7-3.3-2.8-3.1-3.2-3.3-3.6-6.6-6.8-6.8-4.90.0
Percentage of Assets-2.2-2.1-2.0-1.8-1.6-1.6-1.4-1.2-1.0-1.2-1.1-1.0-0.9-0.9-1.0-1.0-1.1-1.9-2.0-2.0-1.5-0.3
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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
Value15121537147812701271124710531000198872810881297106398587010111091177510387909486558065948475797686798556156906177156147668331115772487668726669867510
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 Assets0.90.90.80.70.70.70.60.61.20.40.60.80.70.60.50.60.71.71.10.81.00.70.80.60.90.60.80.70.90.70.70.70.80.70.90.91.30.90.00.00.00.90.00.0

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-31
Value21931093270616252220189612982238152383911741323232819652158182524062743217712096581209748859
Percentage of CashAndCashEquivalentsAtCarryingValue145.071.1183.1128.0174.7152.0123.3223.876.6115.2107.9102.0219.0199.5248.0180.5220.5154.5209.7153.069.4184.6129.2139.7
Percentage of Assets1.30.61.50.91.31.10.81.30.90.50.70.81.41.21.31.11.52.72.21.20.71.20.80.9
Percentage of Assets cb:OtherAceLimitedSubsidiariesAndEliminations1.20.61.40.91.21.00.71.20.80.50.60.71.31.11.21.01.42.50.00.00.01.10.00.0

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value494420171211
Percentage of CashAndCashEquivalentsAtCarryingValue3.228.80.00.15.60.20.10.1
Percentage of Assets0.00.20.00.00.00.00.00.0
Percentage of Assets srt:GuarantorSubsidiaries0.10.80.00.00.10.00.00.0

srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312016-12-312015-12-31
Value10221210311
Percentage of CashAndCashEquivalentsAtCarryingValue0.70.10.10.10.20.10.00.40.10.1
Percentage of Assets0.00.00.00.00.00.00.00.00.00.0
Percentage of Assets srt:ParentCompany0.00.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-7400-1230-357-1022-652-246-115
Percentage of CashAndCashEquivalentsAtCarryingValue-48.90.0-83.2-28.1-80.4-52.3-23.4-15.8
Percentage of Assets-0.40.0-0.7-0.2-0.6-0.4-0.1-0.1
Percentage of Assets srt:ConsolidationEliminations0.6-0.01.00.30.80.60.20.1

Short Term Investments

Property Plant And Equipment Net

Investments In Affiliates Subsidiaries Associates And Joint Ventures

Goodwill

us-gaap:Goodwill



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value149711529615230153001532815271153321547615686155411570715434153871533215481155251540447964904460343194180403038143622
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets8.68.68.78.88.99.19.19.29.39.39.49.59.69.69.69.79.84.75.04.94.74.84.84.90.0

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value59026063614862666091614361396283643765136558657966746763699173987955887
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.43.43.53.63.63.73.73.83.83.93.94.04.14.24.34.65.10.9

Finite Lived Intangible Assets Net

Intangible Assets Net Including Goodwill

us-gaap:IntangibleAssetsNetIncludingGoodwill



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value20873213592137821566214192141421471217592212322054222652201322061220952247222923233595683571359695516572454255522538254045465539549094975499048264799
Percentage of IntangibleAssetsNetIncludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets12.112.112.212.412.512.812.813.013.113.213.313.513.713.813.914.314.95.65.86.05.65.85.65.75.75.75.85.85.35.45.35.35.5

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value208732135921378215662141921414214712175922123220542226522013220612209522472229232335956835724
Percentage of IntangibleAssetsNetIncludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets12.112.112.212.412.512.812.813.013.113.213.313.513.713.813.914.314.95.65.8
Percentage of Assets cb:OtherAceLimitedSubsidiariesAndEliminations11.111.311.311.511.511.811.811.812.111.912.012.212.312.412.512.813.45.25.1

Long Term Debt Current

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
Value13510135591328513371120711208712149121841278611556115591166712300126101262112631126369447415741574157335740574057380838073807380743073360336033603360336033603360335833583158
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 Assets7.87.77.67.77.07.27.27.37.66.96.97.27.67.97.87.98.19.24.34.24.23.44.24.24.04.04.04.14.63.63.63.73.73.83.83.83.94.04.0

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value521975533154572538025235550312509345097151287511725047150349492244827548372472264589729135291272955529587
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets30.131.331.230.830.630.030.430.430.430.630.130.930.630.229.929.529.328.529.829.630.1

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value6900570250707206915868297660366613967200671166527864751641996422863303635946198230710
Percentage of StockholdersEquity132.2127.0129.6128.5130.4131.3129.9131.8130.9127.6128.3127.5130.5131.1131.5131.2105.4
Percentage of Assets39.939.740.439.639.939.439.440.139.839.138.639.439.939.639.338.730.0
Percentage of Assets cb:OtherAceLimitedSubsidiariesAndEliminations36.937.137.336.936.736.336.536.536.835.134.835.636.035.635.334.728.2

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value3129932679321323079729347277042752127796
Percentage of StockholdersEquity60.059.158.957.256.155.154.054.3
Percentage of Assets18.118.518.317.617.116.516.416.6
Percentage of Assets srt:GuarantorSubsidiaries61.060.659.458.555.653.954.053.8

srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value5219755331545725380252355503125093451172
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets30.131.331.230.830.630.030.430.6
Percentage of Assets srt:ParentCompany98.099.498.299.198.899.499.099.3

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-100304-102929-102852-99955-97644-93740-93660-93074
Percentage of StockholdersEquity-192.2-186.0-188.5-185.8-186.5-186.3-183.9-181.9
Percentage of Assets-57.9-58.2-58.7-57.3-57.0-55.9-55.9-55.7
Percentage of Assets srt:ConsolidationEliminations84.584.582.983.381.180.880.776.4

us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value41524375273231249261280202253267291-62-66-69-70-71-74-79-85
Percentage of StockholdersEquity0.00.00.00.10.10.10.50.50.50.50.40.50.50.6-0.1-0.1-0.2-0.2-0.2-0.3-0.30.0
Percentage of Assets0.00.00.00.00.00.00.10.10.20.20.10.20.20.2-0.0-0.0-0.0-0.1-0.1-0.1-0.1-0.1
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value6672543261320331014-545-549-39046145016431551126510582547240416988741285154018511174
Percentage of StockholdersEquity1.34.64.83.81.9-1.1-1.1-0.80.12.83.33.12.62.25.35.13.73.04.45.26.30.0
Percentage of Assets0.41.41.51.20.6-0.3-0.3-0.20.00.91.01.00.80.71.61.51.10.91.31.51.91.2
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value-2093619521139-770-2448-2159-1520-50254310693700-31411971181367-735-1926071191
Percentage of StockholdersEquity-4.01.11.00.3-1.5-4.9-4.2-3.0-1.01.12.10.70.0-0.72.52.50.8-2.5-0.72.14.0
Percentage of Assets-1.20.30.30.1-0.4-1.5-1.3-0.9-0.30.30.60.20.0-0.20.70.70.2-0.7-0.20.61.2
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value-2764-1939-2116-1931-1836-1976-1841-1379-809-1187-776-1434-1532-1663-1288-1157-1262-1539-1406-859-58163
Percentage of StockholdersEquity-5.3-3.5-3.9-3.6-3.5-3.9-3.6-2.7-1.6-2.3-1.5-2.8-3.1-3.4-2.7-2.4-2.7-5.3-4.8-2.9-2.00.0
Percentage of Assets-1.6-1.1-1.2-1.1-1.1-1.2-1.1-0.8-0.5-0.7-0.5-0.9-1.0-1.0-0.8-0.7-0.8-1.5-1.4-0.9-0.60.1
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value107101120311465117571205112557128531315013430139781421714522147951533515601158581614044814665484751455238
Percentage of StockholdersEquity20.520.221.021.923.025.025.225.826.227.328.228.830.131.832.333.635.215.416.016.417.40.0
Percentage of Assets6.26.36.56.77.07.57.77.88.08.48.58.99.29.69.69.910.34.44.84.95.25.5
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value111211112111121111211112111121111211112111121111211112111121111211112111121111211112178337833783380558899
Percentage of StockholdersEquity21.320.120.420.721.222.121.821.821.721.722.022.122.623.023.023.524.226.926.926.527.20.0
Percentage of Assets6.46.36.36.46.56.66.66.66.66.76.66.86.97.06.96.97.17.78.07.88.29.4
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value36331361423496933878327283170031491302602896527474259412601124706236132200320643199171947818795182671664413791
Percentage of StockholdersEquity69.665.364.163.062.563.061.859.456.553.751.451.750.248.945.543.743.466.964.561.856.30.0
Percentage of Assets21.020.420.019.419.118.918.818.117.216.415.516.015.314.813.612.912.719.019.218.316.914.6
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value-3872-3754-3504-3093-2775-2618-2372-2040-1727-1944-1877-1675-1398-1480-1550-1577-1648-1922-1974-1999-1448-255
Percentage of StockholdersEquity-7.4-6.8-6.4-5.7-5.3-5.2-4.7-4.0-3.4-3.8-3.7-3.3-2.8-3.1-3.2-3.3-3.6-6.6-6.8-6.8-4.90.0
Percentage of Assets-2.2-2.1-2.0-1.8-1.6-1.6-1.4-1.2-1.0-1.2-1.1-1.0-0.9-0.9-1.0-1.0-1.1-1.9-2.0-2.0-1.5-0.3
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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
Value111211112111121111211112111121111211112111121111211112111121111211112111121111211112178337833783378338055827885018724889990739249942395919759992710095100951009510098100751016110503
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 Assets6.46.36.36.46.56.66.66.66.66.76.66.86.97.06.96.97.17.78.07.88.08.28.58.79.29.49.69.910.110.410.410.911.211.511.411.311.712.213.5

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
Value363313614234969338783272831700314913026028965274742594126011247062361322003206431991719478187951826717325166441608915304145251379112793118771098610033926886288300751167616792618559262818
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 Assets21.020.420.019.419.118.918.818.117.216.415.516.015.314.813.612.912.719.019.218.317.616.916.515.715.314.613.512.711.810.89.99.59.28.67.67.67.27.13.6

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
Value387237543504309327752618237220401727194418771675139814801550157716481922197419991645144810576304432552222192121591872062273273502502513303
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.22.12.01.81.61.61.41.21.01.21.11.00.90.91.01.01.11.92.02.01.71.51.10.60.50.30.20.20.20.20.20.20.30.40.40.30.30.40.0

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-2093619521139-770-2448-2159-1520-50254310693700-31411971181367-735-192607115211911608209515261152137412602650288730142338220919111839198917821594823
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-1.20.30.30.1-0.4-1.5-1.3-0.9-0.30.30.60.20.0-0.20.70.70.2-0.7-0.20.61.21.21.62.11.61.21.51.32.83.13.22.62.52.22.12.22.11.91.1

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-03-312018-12-312016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-06-302010-03-31
Value171214291322158310201165808816107512741126846125091357210601003868823
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues22.216.416.820.814.824.916.616.224.526.921.717.628.321.213.724.926.323.120.8

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-12-312019-03-312018-12-312016-03-312015-03-31
Value179516441378208110111023
Percentage of NetCashProvidedByUsedInOperatingActivities104.8115.0104.2131.599.195.2
Percentage of Revenues23.318.817.527.314.723.3
Percentage of Revenues cb:OtherAceLimitedSubsidiariesAndEliminations0.00.00.00.00.00.0

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-12-312019-03-312018-12-31
Value-1481808-163-47
Percentage of NetCashProvidedByUsedInOperatingActivities-8.6126.5-12.3-3.0
Percentage of Revenues-1.920.7-2.1-0.6
Percentage of Revenues srt:GuarantorSubsidiaries0.00.00.00.0

srt:ParentCompany



Period End2020-03-312019-12-312019-03-312018-12-31
Value65-930719
Percentage of NetCashProvidedByUsedInOperatingActivities3.8-0.623.21.2
Percentage of Revenues0.8-0.13.90.2
Percentage of Revenues srt:ParentCompany0.00.00.00.0

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-03-312018-12-31
Value0-2014-200-470
Percentage of NetCashProvidedByUsedInOperatingActivities0.0-140.9-15.1-29.7
Percentage of Revenues0.0-23.0-2.5-6.2
Percentage of Revenues srt:ConsolidationEliminations0.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-03-312018-12-312016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-06-302010-03-31
Value-1010-2344-673-808-1615-4869-4050-1020-816-229-956-503-1466-615-1268-631-801-666
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-13.1-26.8-8.5-10.6-23.5-104.1-8.30.0-23.2-17.2-4.4-19.9-11.4-34.0-14.7-29.8-16.6-21.3-16.9

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-12-312019-03-312018-12-312016-03-312015-03-31
Value-1870-1546-633-8042549-1236
Percentage of NetCashProvidedByUsedInInvestingActivities185.166.094.199.5-157.8121.2
Percentage of Revenues-24.3-17.7-8.0-10.537.1-28.2
Percentage of Revenues cb:OtherAceLimitedSubsidiariesAndEliminations0.00.00.00.00.00.0

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-12-312019-03-312018-12-31
Value860-798-150-54
Percentage of NetCashProvidedByUsedInInvestingActivities-85.134.022.36.7
Percentage of Revenues11.2-9.1-1.9-0.7
Percentage of Revenues srt:GuarantorSubsidiaries0.00.00.00.0

srt:ParentCompany



Period End2020-03-312019-12-312019-03-312018-12-31
Value-120000-350
Percentage of NetCashProvidedByUsedInInvestingActivities118.8-0.0-0.043.3
Percentage of Revenues-15.60.00.0-4.6
Percentage of Revenues srt:ParentCompany0.00.00.00.0

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-03-312018-12-31
Value12000110400
Percentage of NetCashProvidedByUsedInInvestingActivities-118.8-0.0-16.3-49.5
Percentage of Revenues15.60.01.45.2
Percentage of Revenues srt:ConsolidationEliminations0.00.00.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-03-312018-12-312016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-06-302010-03-31
Value-645973-630-567-1024472-118-992333-537-615-153-472813139-78-37-98-93
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-8.411.1-8.0-7.4-1.595.6-2.4-19.77.6-11.3-11.8-3.2-10.718.93.3-1.8-1.0-2.6-2.4

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-12-312019-03-312018-12-312016-03-312015-03-31
Value1256-1713-426-664-3910-243
Percentage of NetCashProvidedByUsedInFinancingActivities-194.7-176.167.6117.13833.3-73.0
Percentage of Revenues16.3-19.6-5.4-8.7-56.9-5.5
Percentage of Revenues cb:OtherAceLimitedSubsidiariesAndEliminations0.00.00.00.00.00.0

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-12-312019-03-312018-12-31
Value-1105-568382102
Percentage of NetCashProvidedByUsedInFinancingActivities171.3-58.4-60.6-18.0
Percentage of Revenues-14.4-6.54.91.3
Percentage of Revenues srt:GuarantorSubsidiaries0.00.00.00.0

srt:ParentCompany



Period End2020-03-312019-12-312019-03-312018-12-31
Value114410-306331
Percentage of NetCashProvidedByUsedInFinancingActivities-177.41.048.6-58.4
Percentage of Revenues14.90.1-3.94.3
Percentage of Revenues srt:ParentCompany0.00.00.00.0

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-03-312018-12-31
Value-19403244-280-336
Percentage of NetCashProvidedByUsedInFinancingActivities300.8333.444.459.3
Percentage of Revenues-25.237.1-3.6-4.4
Percentage of Revenues srt:ConsolidationEliminations0.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-03-312018-12-312016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-06-302010-03-31
Value171214291322158310201165808816107512741126846125091357210601003868823
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues22.216.416.820.814.824.916.616.224.526.921.717.628.321.213.724.926.323.120.8

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-12-312019-03-312018-12-312016-03-312015-03-31
Value179516441378208110111023
Percentage of NetCashProvidedByUsedInOperatingActivities104.8115.0104.2131.599.195.2
Percentage of Revenues23.318.817.527.314.723.3
Percentage of Revenues cb:OtherAceLimitedSubsidiariesAndEliminations0.00.00.00.00.00.0

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-12-312019-03-312018-12-31
Value-1481808-163-47
Percentage of NetCashProvidedByUsedInOperatingActivities-8.6126.5-12.3-3.0
Percentage of Revenues-1.920.7-2.1-0.6
Percentage of Revenues srt:GuarantorSubsidiaries0.00.00.00.0

srt:ParentCompany



Period End2020-03-312019-12-312019-03-312018-12-31
Value65-930719
Percentage of NetCashProvidedByUsedInOperatingActivities3.8-0.623.21.2
Percentage of Revenues0.8-0.13.90.2
Percentage of Revenues srt:ParentCompany0.00.00.00.0

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-03-312018-12-31
Value0-2014-200-470
Percentage of NetCashProvidedByUsedInOperatingActivities0.0-140.9-15.1-29.7
Percentage of Revenues0.0-23.0-2.5-6.2
Percentage of Revenues srt:ConsolidationEliminations0.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value25211731091115010403551231129410821533-701305109316101360726439683528942681555785779734998916891953765640328973750-316072591001675677755953494535567
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues3.313.412.113.513.24.714.115.213.819.1-0.816.114.619.715.99.26.414.610.818.715.511.715.116.216.619.717.718.922.116.312.58.423.216.7-0.714.36.822.717.418.019.122.313.415.115.9

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value26411181262114012581358122323138712241423867619505538948693
Percentage of NetIncomeLoss104.8102.5109.7109.6102.2104.9113.0-32.9106.3112.0104.6119.4141.073.9101.9100.6101.8
Percentage of Revenues3.412.414.814.514.416.015.60.317.116.316.711.09.010.811.018.815.8
Percentage of Revenues cb:OtherAceLimitedSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value58575960460962833768462
Percentage of NetIncomeLoss232.169.652.558.651.026.063.2-88.6
Percentage of Revenues7.68.47.17.77.24.08.70.7
Percentage of Revenues srt:GuarantorSubsidiaries0.00.00.00.00.00.00.00.0

srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value25211731091115010403551231129410821533-70
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues3.313.412.113.513.24.714.115.213.819.1-0.8
Percentage of Revenues srt:ParentCompany0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-849-1837-1877-1866-1749-843-1886-1695-1907-2333-85
Percentage of NetIncomeLoss-336.9-156.6-172.0-162.3-168.2-237.5-153.2-131.0-176.2-152.2121.4
Percentage of Revenues-11.0-21.0-20.8-21.9-22.2-11.1-21.6-19.9-24.4-29.1-1.0
Percentage of Revenues srt:ConsolidationEliminations0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementBusinessSegments

us-gaap:Corporate



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-1479-685-555-605-384-520-475-305-413-545
Percentage of NetIncomeLoss-586.9-62.8-48.3-58.2-31.2-40.2-43.9435.7-31.6-49.9
Percentage of Revenues-19.2-7.6-6.5-7.7-4.4-6.1-6.1-3.5-5.1-7.3
Percentage of Revenues us-gaap:Corporate0.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-06-302010-03-31
Value25211731091115010403551231129410821533-701305109316101360726439683528942681555785779734953973607259677755
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues3.313.412.113.513.24.714.115.213.819.1-0.816.114.619.715.99.26.414.610.818.715.511.715.116.216.622.123.214.36.818.019.1
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-06-302010-03-31
Value-140-46415368205-354579142-16-26795228-238-56096466-289-530194-5477-38615957219455-83-159-331-146
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-03-312018-12-312016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-06-302010-03-31
Value-1010-2344-673-808-1615-4869-4050-1020-816-229-956-503-1466-615-1268-631-801-666
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-13.1-26.8-8.5-10.6-23.5-104.1-8.30.0-23.2-17.2-4.4-19.9-11.4-34.0-14.7-29.8-16.6-21.3-16.9

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-12-312019-03-312018-12-312016-03-312015-03-31
Value-1870-1546-633-8042549-1236
Percentage of NetCashProvidedByUsedInInvestingActivities185.166.094.199.5-157.8121.2
Percentage of Revenues-24.3-17.7-8.0-10.537.1-28.2
Percentage of Revenues cb:OtherAceLimitedSubsidiariesAndEliminations0.00.00.00.00.00.0

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-12-312019-03-312018-12-31
Value860-798-150-54
Percentage of NetCashProvidedByUsedInInvestingActivities-85.134.022.36.7
Percentage of Revenues11.2-9.1-1.9-0.7
Percentage of Revenues srt:GuarantorSubsidiaries0.00.00.00.0

srt:ParentCompany



Period End2020-03-312019-12-312019-03-312018-12-31
Value-120000-350
Percentage of NetCashProvidedByUsedInInvestingActivities118.8-0.0-0.043.3
Percentage of Revenues-15.60.00.0-4.6
Percentage of Revenues srt:ParentCompany0.00.00.00.0

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-03-312018-12-31
Value12000110400
Percentage of NetCashProvidedByUsedInInvestingActivities-118.8-0.0-16.3-49.5
Percentage of Revenues15.60.01.45.2
Percentage of Revenues srt:ConsolidationEliminations0.00.00.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-03-312018-12-312016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-06-302010-03-31
Value-645973-630-567-1024472-118-992333-537-615-153-472813139-78-37-98-93
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-8.411.1-8.0-7.4-1.595.6-2.4-19.77.6-11.3-11.8-3.2-10.718.93.3-1.8-1.0-2.6-2.4

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-12-312019-03-312018-12-312016-03-312015-03-31
Value1256-1713-426-664-3910-243
Percentage of NetCashProvidedByUsedInFinancingActivities-194.7-176.167.6117.13833.3-73.0
Percentage of Revenues16.3-19.6-5.4-8.7-56.9-5.5
Percentage of Revenues cb:OtherAceLimitedSubsidiariesAndEliminations0.00.00.00.00.00.0

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-12-312019-03-312018-12-31
Value-1105-568382102
Percentage of NetCashProvidedByUsedInFinancingActivities171.3-58.4-60.6-18.0
Percentage of Revenues-14.4-6.54.91.3
Percentage of Revenues srt:GuarantorSubsidiaries0.00.00.00.0

srt:ParentCompany



Period End2020-03-312019-12-312019-03-312018-12-31
Value114410-306331
Percentage of NetCashProvidedByUsedInFinancingActivities-177.41.048.6-58.4
Percentage of Revenues14.90.1-3.94.3
Percentage of Revenues srt:ParentCompany0.00.00.00.0

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-03-312018-12-31
Value-19403244-280-336
Percentage of NetCashProvidedByUsedInFinancingActivities300.8333.444.459.3
Percentage of Revenues-25.237.1-3.6-4.4
Percentage of Revenues srt:ConsolidationEliminations0.00.00.00.0

Proceeds From Issuance Of Long Term Debt

Repayments Of Long Term Debt

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-31
Value32332746237436731238531829942323471280000840334742245022233515411068
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-31
Value00462374367312385318299423234712808403347
Percentage of PaymentsForRepurchaseOfCommonStock0.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value32332700000000
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.00.00.00.00.00.00.00.00.0

Repayments Of Long Term Debt

Debt Instrument Interest Rate Stated Percentage

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

Deferred Tax Liabilities

Deferred Tax Assets Net

Unrecognized Tax Benefits

Deferred Tax Assets Valuation Allowance

Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset



Period End2020-03-312019-12-31
Value509551
Percentage of OperatingLeaseRightOfUseAsset100.0100.0

Cash And Cash Equivalents Period Increase Decrease

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value16581646158913681393134011571101211385111931419116010881885
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value23391202281717232342198914022339164896212791445242520682853
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents141.173.0177.3126.0168.1148.4121.2212.478.0113.0107.2101.8209.1190.1151.4

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312015-12-31
Value4944201712118641012
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents3.026.90.00.15.10.10.10.140.90.10.00.10.1

srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312015-12-31
Value10221210113111
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents0.60.10.10.10.10.10.00.10.00.40.10.10.1

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312015-12-31
Value-7400-1230-357-1022-652-246-1240-400-115-87-982-971
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents-44.60.0-77.4-26.1-73.4-48.7-21.3-112.6-18.9-13.5-7.3-90.3-51.5

Proceeds From Repayments Of Short Term Debt

dei:LegalEntity

cb:AdvancesToFromAffiliatesFinancingActivities

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-36-203-22-73942363-33-116561623-1-63-129-13-14-1211-15313-4
Percentage of AdvancesToFromAffiliatesFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value110215082171806-30843479242395269
Percentage of AdvancesToFromAffiliatesFinancingActivities-3061.1-742.9-986.4-244.4-733.3119.6-2400.0-364.716.94483.3

srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value-1066-1305-195-1067266-797-759-307-656-275
Percentage of AdvancesToFromAffiliatesFinancingActivities2961.1642.9886.4144.4633.3-219.62300.0264.7-116.9-4583.3

us-gaap:ConsolidatedEntities, us-gaap:SubsequentEventType

srt:GuarantorSubsidiaries, us-gaap:SubsequentEvent



Period End2020-01-31
Value-1500
Percentage of AdvancesToFromAffiliatesFinancingActivities0.0

cb:DebtSecuritiesAvailableForSaleCreditImpairmentChargesIntenttoSell



Period End2020-03-312019-03-31
Value1210
Percentage of DebtSecuritiesAvailableForSaleCreditImpairmentChargesIntenttoSell100.00.0

us-gaap:ConsolidatedEntities

cb:EquityInEarningsOfSubsidiaries

srt:GuarantorSubsidiaries



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value593824762759709454885
Percentage of EquityInEarningsOfSubsidiaries100.0100.0100.0100.0100.0100.0100.0

srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value256116010531104990313117712411022
Percentage of EquityInEarningsOfSubsidiaries43.20.0127.8144.9130.40.0166.0273.3115.5

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-849-1837-1877-1866-1749-843-1886-1695-1907
Percentage of EquityInEarningsOfSubsidiaries-143.20.0-227.8-244.9-230.40.0-266.0-373.3-215.5

us-gaap:StatementEquityComponents

cb:FundingDividendsDeclaredFromAdditionalPaidInCapital

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value3402380-341-344-3352352-337-339-3322304-331-332-3242244-323-323-3141088-218-2170
Percentage of FundingDividendsDeclaredFromAdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:StatementEquityComponents

cb:FundingDividendsDeclaredToRetainedEarnings

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-31
Value-340-340-341-344-335-336-337-339-332-330-331-332-324-324-323-323-314-218-2170
Percentage of FundingDividendsDeclaredToRetainedEarnings100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

cb:NetPriorPeriodDevelopment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-118-233-167-188-204-253-243-191-209
Percentage of NetPriorPeriodDevelopment100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

cb:NetProceedsFromPaymentsToAffiliatedNotionalCashPoolingProgram

srt:GuarantorSubsidiaries



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value0-422511-74756-837115
Percentage of NetProceedsFromPaymentsToAffiliatedNotionalCashPoolingProgram0.0100.0100.0100.0100.0100.0100.0

srt:ParentCompany



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-740-451154-296238-3-400
Percentage of NetProceedsFromPaymentsToAffiliatedNotionalCashPoolingProgram0.0106.930.1400.031.50.4-347.8

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value740873-665370-994840285
Percentage of NetProceedsFromPaymentsToAffiliatedNotionalCashPoolingProgram0.0-206.9-130.1-500.0-131.5-100.4247.8

cb:NetRealizedGainsLosses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312016-06-302016-03-312015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-958-55-155-223-97-6871918-2-216-394126-89-60-397126-89-210-120-73-104
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dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312016-06-302016-03-312015-06-302015-03-31
Value-1050-219-206-852-5724-214-394128-89
Percentage of NetRealizedGainsLosses109.6141.392.487.610.5-316.7-1200.099.1100.0101.6100.0

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
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srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
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us-gaap:StatementBusinessSegments

us-gaap:Corporate



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-958-155-223-971918-2
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cb:NetrealizedgainslossesexcludingOTTI



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
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dei:LegalEntity

cb:PaymentOfContributionsToSubsidiary

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
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us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
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srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1200040060003503750750
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srt:ParentCompany, us-gaap:SubsequentEvent



Period End2020-01-31
Value-1200
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us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
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cb:PolicyAcquisitionCostsAndAdministrativeExpenses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value235623522355230221742208222322112156218422022155207321252286238921851306133913051261
Percentage of PolicyAcquisitionCostsAndAdministrativeExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value23702338228521692290216921162166213920412259227721321282131712801241
Percentage of PolicyAcquisitionCostsAndAdministrativeExpenses100.699.399.399.8103.098.198.198.499.398.598.895.397.698.298.498.198.4

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-38-5-5-15-90192216
Percentage of PolicyAcquisitionCostsAndAdministrativeExpenses-1.6-0.2-0.2-0.7-4.00.91.00.7

srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value2428222220232323181920
Percentage of PolicyAcquisitionCostsAndAdministrativeExpenses1.01.20.91.00.91.01.01.00.80.90.9

cb:PriorPeriodDevelopmentnetadjustments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value2-741-524-149
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cb:ProceedsFromSaleOfAvailableForSaleSecuritiesDebtCondensed



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value4687268025984545329342962562404023423478339528141995553963295581159116402002
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dei:LegalEntity

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value4687268025974545329342962562404022433478339528141929553963295581159116402002
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cb:ProceedsFromSalesToBeAnnouncedMortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312016-12-312016-09-302015-12-312015-09-30
Value000062900056000
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cb:SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value15571545161617251468137415751674138613845516231493178918041353128692711341085953
Percentage of SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

cb:SegmentGlobalReinsurance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1138110190104-4897106122
Percentage of SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss7.35.26.25.27.1-3.56.26.38.8

cb:SegmentInsuranceNorthAmericanAgriculture



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value18-22162777166873310018989239218785215857752853
Percentage of SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss1.2-1.41.01.65.212.15.52.07.213.7161.81.46.210.54.71.64.56.16.62.65.6

cb:SegmentInsuranceNorthAmericanCommercialPCMemberMember



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
Value9639529779289331015927212952937900810827464479442
Percentage of SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss61.858.956.663.259.260.666.9385.558.762.849.959.964.340.944.146.4

cb:SegmentInsuranceNorthAmericanPersonalPCMember



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value26565263173159126571878-29-18016422217421616473471987-10
Percentage of SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss17.04.216.310.010.89.23.611.20.6-2.1-327.310.114.99.712.012.15.75.11.78.0-1.0

cb:SegmentInsuranceOverseasGeneral



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value278290349342292306363396336460131396229330530342314314416321316
Percentage of SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss17.918.821.619.819.922.323.023.724.233.2238.224.415.318.429.425.324.433.936.729.633.2

cb:SegmentLife



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value949095968589787764706452626069746759657866
Percentage of SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss6.05.85.95.65.86.55.04.64.65.1116.43.24.23.43.85.55.26.45.77.26.9

us-gaap:Corporate



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-174-16020-177-40-140-171-180-95-145
Percentage of SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss-11.2-9.91.2-12.1-2.5-8.4-12.3-327.3-5.9-9.7

us-gaap:Range

cb:SignificantUnobservableInputsAnnuitizationRate

srt:Maximum



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value0.520.100000000000000030.00.00.42-0.5800000000000001
Percentage of SignificantUnobservableInputsAnnuitizationRate100.0100.00.00.0100.0100.0

srt:WeightedAverage



Period End2020-03-31
Value0.046
Percentage of SignificantUnobservableInputsAnnuitizationRate8.8

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments



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-87-85-91-118-143-156-155-173-169-184-182-202-174-44
Percentage of AccretionAmortizationOfDiscountsAndPremiumsInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdditionsToContractHoldersFunds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value135138139122115184777411813010310010949199156118152116134101177647451
Percentage of AdditionsToContractHoldersFunds100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value135138139122115184777411813010310010949199156118152116134101
Percentage of AdditionsToContractHoldersFunds100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-03-31
Value69896063549963616210867916563801056529444863325348524233373431
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us-gaap:AmortizationOfIntangibleAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value737676777686838585666565643457355155303027
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

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Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value7376777683858565656445735515530
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

cb:SegmentInsuranceNorthAmericanAgriculture



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value7777777777877778788
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cb:SegmentInsuranceNorthAmericanPersonalPCMember



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value333333433445334481531
Percentage of AmortizationOfIntangibleAssets4.13.93.93.93.93.54.83.53.56.16.27.74.7100.0100.080.0114.342.960.8

cb:SegmentInsuranceOverseasGeneral



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value1211111211128111012111111121213111112
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cb:SegmentLife



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value1000000.00.01000000.01000000.00.01000000.00.00.01000000.00.01000000.00.01000000.01000000.01000000.00.01000000.01000000.00.0
Percentage of AmortizationOfIntangibleAssets1.40.01.31.30.01.20.00.01.20.01.50.01.633.325.00.014.32.90.0

us-gaap:Corporate



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value50545455646464414242
Percentage of AmortizationOfIntangibleAssets68.571.170.172.477.175.375.363.164.665.6

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value3024332220122110110110110200001
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us-gaap:BenefitsLossesAndExpenses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value7230739677247169664871127336699866146864876566036289629968907016631439294211396335883950423939033592410136993235435134503102416035243452305329413070
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us-gaap:BusinessCombinationIntegrationRelatedCosts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value01424320161310775072111131115981482490000
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us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1257221-255318356-10121262-342-22625972
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
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Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect9475.0-2833.3495.02476.0666.0320.8-1673.2-68.354.492.773.5-378.4495.8

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value-393442-1-706910-8638631
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect-3275.0775.4-0.5280.0130.20.50.085.368.4-0.3

srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
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us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value-7401230-873665-370-406994-840-285-28
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect-6166.72157.9-395.0-2660.0-698.1-221.91775.083.0-22.68.2

dei:LegalEntity

us-gaap:CashDividendsPaidToParentCompany

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value0-20140-1660-200-470-1763-75-3000-4830-1545-496-7950-1000-6372-3503
Percentage of CashDividendsPaidToParentCompany0.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value02014016602004701763753000483
Percentage of CashDividendsPaidToParentCompany0.0-100.00.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0

us-gaap:Currency

us-gaap:CommonStockDividendsPerShareDeclared

currency:CHF



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.720.73999999999999980.730.750.720.730.720.730.66
Percentage of CommonStockDividendsPerShareDeclared100.0100.0100.0100.0100.0100.0100.0100.0100.0

currency:USD



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.750.750.750.750.730.730.730.730.71
Percentage of CommonStockDividendsPerShareDeclared104.2101.4102.7100.0101.4100.0101.4100.0107.6

us-gaap:ComprehensiveIncomeNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-24601271147320592718-8059227745310076291675140799137615401541140-271397
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-30
Value-241815172181278864035261472417561538143916811721-262403
Percentage of ComprehensiveIncomeNetOfTax98.3103.0105.9102.6108.1127.1135.5115.1104.8109.3104.6109.2111.796.7101.5

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-120011381397194147-462216748
Percentage of ComprehensiveIncomeNetOfTax48.877.367.871.47.9-166.847.7118.9

srt:ParentCompany



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-2460147320592718592277453629
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value3618-2655-3578-4729-687110-830-1472
Percentage of ComprehensiveIncomeNetOfTax-147.1-180.2-173.8-174.0-116.039.7-183.2-234.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease



Period End2020-03-31
Value149
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease100.0

us-gaap:AdjustmentsForNewAccountingPronouncements

us-gaap:AccountingStandardsUpdate201613



Period End2020-03-312019-03-31
Value-1500
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease-100.70.0

us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss

us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-31912-1112-44-160-38-81-23
Percentage of DebtSecuritiesAvailableForSaleRealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment

us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value7750705627105649966
Percentage of DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleRealizedLossExcludingOtherThanTemporaryImpairment

us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value125305731582329117688
Percentage of DebtSecuritiesAvailableForSaleRealizedLossExcludingOtherThanTemporaryImpairment100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-20-24-20-20-20-21-21-22-21-21-22-23-23
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

country:US, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value564747475353
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value101211111212
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets17.925.523.423.422.622.6

us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value111111211121113
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets1.82.12.10.02.11.93.80.00.00.00.00.00.00.00.0

us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanInterestCost

country:US, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value252930302626
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value676776
Percentage of DefinedBenefitPlanInterestCost24.024.120.023.326.923.1

us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value111110111120144
Percentage of DefinedBenefitPlanInterestCost4.03.43.30.03.30.03.80.00.00.00.00.00.00.00.0

us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

country:US, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value-30-5-4-5-12-13
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value-3-1-1-11-2
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost10.020.025.020.0-8.315.4

us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-20-24-20-20-20-22-22-23-21-26-54-22-23-125
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost66.7480.0500.00.0400.0183.3169.20.00.00.00.00.00.00.00.0

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-30
Value-33-6-5-7-6-11-15-13-16-24-3-1173
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost110.0120.0125.00.0120.091.7115.40.00.00.00.00.00.0

us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1

country:US, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value-1000000.0-1000000.0-1000000.00.0-1000000.00.0
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1100.0100.0100.00.0100.00.0

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value0-100-30
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1-0.0100.0-0.00.0300.00.0

us-gaap:IncomeStatementLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanServiceCost

cb:Lossesandlossexpenses, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value012122212
Percentage of DefinedBenefitPlanServiceCost0.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GeneralAndAdministrativeExpense, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.00.00.00.00.00.01000000.00.00.0
Percentage of DefinedBenefitPlanServiceCost0.00.00.00.00.00.050.00.00.0

us-gaap:GeneralAndAdministrativeExpense, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value11413141315151715
Percentage of DefinedBenefitPlanServiceCost0.01400.0650.01400.0650.0750.0750.01700.0750.0

us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

country:US, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value01212121414
Percentage of DefinedBenefitPlanServiceCost0.01200.0600.0600.0700.0700.0

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value133333
Percentage of DefinedBenefitPlanServiceCost0.0300.0150.0150.0150.0150.0

us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value000000100002014
Percentage of DefinedBenefitPlanServiceCost0.00.00.00.00.00.050.00.00.00.00.00.00.00.00.0

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-30
Value1151515151717181719212126
Percentage of DefinedBenefitPlanServiceCost0.01500.0750.01500.0750.0850.0850.01800.0850.00.00.00.00.0

us-gaap:DerivativeGainLossOnDerivativeNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-30
Value-547-23-223-259-80-421-17297919-22632731648-206-28479-344128-56-209-63-76-94427296-60
Percentage of DerivativeGainLossOnDerivativeNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk

cb:GuaranteedLivingBenefitAndOtherDerivativeInstruments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-5624-126-7850-268-545626-8792126447-159-24553-322101
Percentage of DerivativeGainLossOnDerivativeNet102.7-17.456.530.1-62.563.7317.617.278.531.636.4125.477.883.597.977.286.367.193.678.9

cb:InvestmentAndEmbeddedDerivativeInstruments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value15-27-97-181-130-15337241713-14-166521-47-3926-2227
Percentage of DerivativeGainLossOnDerivativeNet-2.7117.443.569.9162.536.3-217.682.821.568.463.6-25.422.216.52.122.813.732.96.421.1

cb:OtherDerivatives



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-20-147-1-5-882-1-5-12-1130-2-2-9-1
Percentage of DerivativeGainLossOnDerivativeNet0.4-0.06.3-2.71.21.247.127.62.5-5.322.7-1.67.4-3.56.2-0.00.7-2.52.6-0.8

cb:OtherFuturesContractsAndOptions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-27-5-22-25-36-81321134-8-9-8538-37-3419-2342
Percentage of DerivativeGainLossOnDerivativeNet4.921.79.99.745.01.9-76.572.416.521.136.4-14.3-29.616.816.718.012.024.16.732.8

us-gaap:ConvertiblesAndBondsWithWarrantsAttached



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-10011-2000010003056-14-5
Percentage of DerivativeGainLossOnDerivativeNet0.2-0.0-0.0-0.4-1.20.5-0.00.00.00.0-4.50.00.00.06.2-0.0-1.87.64.1-3.9

us-gaap:EquityContract



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value125-49-6-20-63118-100-4422-92-57-38-74-48-45-28-15
Percentage of DerivativeGainLossOnDerivativeNet-22.9213.02.77.778.8-28.0588.2-151.727.8-484.2259.1-60.3-274.1-15.2-93.813.65.3

us-gaap:ForeignExchangeContract



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value15-27-97-181-130-15337241713-14-166521-47-39
Percentage of DerivativeGainLossOnDerivativeNet-2.7117.443.569.9162.536.3-217.682.821.568.463.6-25.422.216.52.122.813.7

us-gaap:ForeignExchangeFuture



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value43-22-20-22-15-2-2349-7-714-1-10-10-10115-10
Percentage of DerivativeGainLossOnDerivativeNet-7.995.79.08.518.80.511.810.35.147.431.8-11.151.9-0.3-20.84.93.51.3-4.4-7.8

us-gaap:GuaranteedMinimumIncomeBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-68553-106-65114-38154413899541189332389-131-228
Percentage of DerivativeGainLossOnDerivativeNet125.2-230.447.525.1-142.590.5-317.6141.448.1521.1-245.5187.3344.4102.2185.463.680.3

us-gaap:InterestRateSwap



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value00-55-135-80-141260000
Percentage of DerivativeGainLossOnDerivativeNet-0.0-0.024.752.1100.033.5-152.90.00.00.0-0.0

us-gaap:OtherContract



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-20-147-1-5-882-1-5-12-1130-2
Percentage of DerivativeGainLossOnDerivativeNet0.4-0.06.3-2.71.21.247.127.62.5-5.322.7-1.67.4-3.56.2-0.00.7

us-gaap:SingleStockFuture



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value125-49-6-20-63118-100-4422-92-57-38-74-48-45-28-15-7984-2
Percentage of DerivativeGainLossOnDerivativeNet-22.9213.02.77.778.8-28.0588.2-151.727.8-484.2259.1-60.3-274.1-15.2-93.813.65.3-100.0-24.4-1.6

us-gaap:StatementBusinessSegments

cb:SegmentInsuranceNorthAmericanAgriculture



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value2147-1-882-5
Percentage of DerivativeGainLossOnDerivativeNet-0.4-6.3-2.71.247.127.62.522.7

us-gaap:StatementEquityComponents

us-gaap:DividendsCommonStockCash

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value-3403403413443353363373393323303313323243243233233142182182170000810200
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0100.00.0100.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-45-17434-2-6325-628-17
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-44-18-134-1-6527-628-17
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents97.8105.9-25.0100.050.0103.2108.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value0.01000000.00.00.00.00.00.0
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents-0.0-5.90.00.0-0.0-0.00.0

srt:ParentCompany



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-1050-12-2
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents2.2-0.0125.00.050.0-3.2-8.0

us-gaap:InvestmentType

us-gaap:EquitySecuritiesFvNiRealizedGainLoss

us-gaap:EquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-29383558-8135-2-11
Percentage of EquitySecuritiesFvNiRealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci

us-gaap:AvailableforsaleSecurities, us-gaap:CorporateDebtSecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-31
Value-44
Percentage of FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci100.0

us-gaap:AvailableforsaleSecurities, us-gaap:ForeignGovernmentDebtSecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-31
Value-15
Percentage of FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci34.1

us-gaap:AvailableforsaleSecurities, us-gaap:MortgageBackedSecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-31
Value0.0
Percentage of FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci-0.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:EquitySecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-31
Value0.0
Percentage of FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci-0.0

us-gaap:OtherLongTermInvestments, us-gaap:FairValueInputsLevel3



Period End2020-03-31
Value0.0
Percentage of FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci-0.0

us-gaap:ShortTermInvestments, us-gaap:FairValueInputsLevel3



Period End2020-03-31
Value0.0
Percentage of FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci-0.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss

us-gaap:CorporateDebtSecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-140-10-6000
Percentage of FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss100.00.0100.00.0100.00.00.00.0

us-gaap:EquitySecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-20-1-1-1-11-30-10
Percentage of FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss14.30.00.0100.00.00.0-16.70.00.00.00.0

us-gaap:ForeignGovernmentDebtSecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value0.00.00.00.0-1000000.00.00.00.0
Percentage of FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss-0.00.0-0.00.016.70.00.00.0

us-gaap:OtherLongTermInvestments, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0.00.00.00.00.00.00.01000000.00.00.00.0
Percentage of FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss-0.00.00.0-0.00.00.0-0.00.00.00.00.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass, us-gaap:GuaranteedInsuranceContractTypeOfBenefit

us-gaap:FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss

us-gaap:FairValueInputsLevel3, us-gaap:Guarantees, us-gaap:GuaranteedMinimumIncomeBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-685-106-6511454423754
Percentage of FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1

us-gaap:CorporateDebtSecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value1301-16-200
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1100.00.0100.0100.0100.0100.00.00.0

us-gaap:EquitySecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value2-611212-73-23-1
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings115.40.00.0100.0-200.00.0-116.7-150.00.00.00.0

us-gaap:ForeignGovernmentDebtSecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value20012000
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings115.40.00.0-100.033.3-0.00.00.0

us-gaap:OtherLongTermInvestments, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0000020-1000
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings10.00.00.00.0-0.00.00.050.00.00.00.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss

us-gaap:CorporateDebtSecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-45-4147-9-3-1
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value10-111-2-101-20
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss-2.20.025.0100.025.00.0-14.3-0.0-33.30.0-0.0

us-gaap:ForeignGovernmentDebtSecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-14-806-2-791
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss31.1200.00.0150.0-28.677.8-300.0-100.0

us-gaap:OtherLongTermInvestments, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value000000-40230
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss-0.00.0-0.00.00.00.0-57.1-0.0-66.70.0-0.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases

us-gaap:CorporateDebtSecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value13917612112898217139169
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value315559116317117
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases2.20.02.84.17.00.06.11.412.20.010.1

us-gaap:ForeignGovernmentDebtSecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value8268435398958724
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases59.038.635.541.4100.043.862.614.2

us-gaap:MortgageBackedSecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value010181047
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases0.00.60.014.11.00.02.94.1

us-gaap:OtherLongTermInvestments, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0000002016141715
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases0.00.00.00.00.00.020.47.410.10.08.9

us-gaap:ShortTermInvestments, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value10240001811
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases0.70.01.13.30.00.00.00.55.80.00.6

us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales

us-gaap:CorporateDebtSecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value1918363718455124
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value4434105185085
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales21.10.016.711.127.00.0100.011.10.00.020.8

us-gaap:ForeignGovernmentDebtSecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value463514522111914
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales242.1194.438.913.5122.224.437.358.3

us-gaap:MortgageBackedSecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value0.00.01000000.00.00.00.00.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales0.00.02.80.00.00.00.00.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements

us-gaap:CorporateDebtSecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value10164785885633957
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignGovernmentDebtSecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value1318264113
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements1.04.723.144.84.71.62.65.3

us-gaap:MortgageBackedSecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value001118108
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements0.00.01.31.721.21.60.014.0

us-gaap:OtherLongTermInvestments, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0010001723996
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements0.00.01.60.00.00.020.036.523.10.010.5

us-gaap:ShortTermInvestments, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value60001561118
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements5.90.00.00.01.70.07.11.62.60.014.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3

us-gaap:CorporateDebtSecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value9111051860111
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:ForeignGovernmentDebtSecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value00035070
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel30.00.00.060.027.80.00.00.0

us-gaap:MortgageBackedSecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value0.00.00.00.00.00.01000000.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel30.00.00.00.00.00.00.00.0

us-gaap:ShortTermInvestments, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value00000000500
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel30.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3

us-gaap:CorporateDebtSecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-1000-210-10-26
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3100.00.00.00.0100.00.0100.0100.0

us-gaap:ForeignGovernmentDebtSecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-300-15-200-3
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3300.00.00.00.09.50.0-0.011.5

us-gaap:OtherLongTermInvestments, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0000025200000
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3-0.00.00.00.00.00.0-0.00.0-0.00.0-0.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass, us-gaap:GuaranteedInsuranceContractTypeOfBenefit

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings

us-gaap:FairValueInputsLevel3, us-gaap:Guarantees, us-gaap:GuaranteedMinimumIncomeBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-685-106-6511454423754
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueOptionChangesInFairValueGainLoss1



Period End2020-03-312019-03-31
Value-685114
Percentage of FairValueOptionChangesInFairValueGainLoss1100.0100.0

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value-68-7984-11132939140-77261514-197229-2239-7-2-40-312-19-14-9-26-576-50-9-520-30-79-6261-9
Percentage of ForeignCurrencyTransactionGainLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentType

us-gaap:GainLossOnSaleOfInvestments

cb:Equitysecuritiesandotherinvestments



Period End2020-03-312019-03-31
Value-24-1
Percentage of GainLossOnSaleOfInvestments100.0100.0

us-gaap:EquitySecurities



Period End2020-03-312019-03-312018-09-302018-06-302018-03-31
Value-24148510
Percentage of GainLossOnSaleOfInvestments100.0-100.00.00.00.0

us-gaap:OtherInvestments



Period End2020-03-312019-03-312018-09-302018-06-302018-03-31
Value0-2000
Percentage of GainLossOnSaleOfInvestments-0.0200.00.00.00.0

us-gaap:ImpairmentOfInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value095414-1371-144-182-8
Percentage of ImpairmentOfInvestments0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeTaxesPaidNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-06-302010-03-31
Value1071792115081419090130938414245654302101153106134721679699102886043722194618175
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value-392-201351145-502547317235-724311-225-112-49112-12752-34358-22794-46143-167101-64144-65-77
Percentage of IncreaseDecreaseInAccountsPayableAndAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedIncomeTaxesPayable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-06-302010-03-31
Value109-9067-250266-21-4213688-103-159-294191-161241-76143-140112-140209150-71152941-12332-55115
Percentage of IncreaseDecreaseInAccruedIncomeTaxesPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-06-302010-03-31
Value13-8145577630-11769237639-15127-10961-9042-6055-101-7-10476-1170-351-28-19-1462
Percentage of IncreaseDecreaseInDeferredIncomeTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDeferredPolicyAcquisitionCosts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-06-302010-03-31
Value65787213163315713875617712059133274562480811181081289178129991217285647691
Percentage of IncreaseDecreaseInDeferredPolicyAcquisitionCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInFuturePolicyBenefitReserves



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-06-302010-03-31
Value31674760416526865831529440592378285943664855428356442782-45-1353
Percentage of IncreaseDecreaseInFuturePolicyBenefitReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value228-5343717862134703153-420-6523200-257-154-584586402-72-150-138233-320137673
Percentage of IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPremiumsReceivable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value6-101-4721121-278-93-55955174-96-236605-30415-37839-60168-347572-240278-53508-2644558-230
Percentage of IncreaseDecreaseInPremiumsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInReinsurancePayables



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value2-188-20-10713148-10142525024-3126252699-44208-1549-3133741581953930112-41-126-47
Percentage of IncreaseDecreaseInReinsurancePayables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInReinsuranceRecoverable



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-116139-66297397-37-141
Percentage of IncreaseDecreaseInReinsuranceRecoverable100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInUnearnedPremiums



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-06-302010-03-31
Value192-10253534274-125144524111-76-4636917-133-165234-616-18-67208212-8-145324270267265353125424394
Percentage of IncreaseDecreaseInUnearnedPremiums100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInUnearnedPremiumsNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-183-62-295-452-176115-202-351-77167-95
Percentage of IncreaseDecreaseInUnearnedPremiumsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value2032203330333033302330333233223022111
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:InterestIncomeExpenseNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value-132-134-138-140-140-153-164-167-157-156-150-147-154-154-152-153-146-93-68-71-68-67-70-72-71-72-73-60-636262-626263
Percentage of InterestIncomeExpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-18-26-22-21-36-39-28-26-19-17-12-13-11-6-8-9-7
Percentage of InterestIncomeExpenseNet13.618.815.715.022.023.417.817.312.911.07.98.57.56.511.812.710.3

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-148-171-180-185-203-204-209-208
Percentage of InterestIncomeExpenseNet112.1123.9128.6132.1123.8122.2133.1138.7

srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value3456596266687576808084
Percentage of InterestIncomeExpenseNet-25.8-41.8-42.8-44.3-47.1-44.4-45.7-45.5-51.0-51.3-56.0

us-gaap:StatementBusinessSegments

us-gaap:Corporate



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-132-138-140-140-164-167-157-150-147-154
Percentage of InterestIncomeExpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestPaidNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-06-302010-03-31
Value9118541201852187125082240772527525271248717161794878528351313781317229
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilityForFuturePolicyBenefitsPeriodExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value1292251581611961621271501511761691631681611551461261598915314213412514411413613811013114213010214711983108919093878769797899
Percentage of LiabilityForFuturePolicyBenefitsPeriodExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value12915816119612715015116916316815514612615989153142
Percentage of LiabilityForFuturePolicyBenefitsPeriodExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

cb:SegmentLife



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value12922515816119616212715015117616916316816115514612615989153142
Percentage of LiabilityForFuturePolicyBenefitsPeriodExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value920297426321503785302221761537809263816661473798203419011378586
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value33352205255125893234220023272836343324842631264931092346192925782963
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value44854865505247154098461048684487410242726247414637893855426942543674
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeStatementLocation, us-gaap:RetirementPlanType

us-gaap:NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent

cb:Lossesandlossexpenses, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-2-2-2-2-3-3-1
Percentage of NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent100.0100.0100.0100.0100.0100.0100.0

cb:Lossesandlossexpenses, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-3-1-2-2-3-2-3
Percentage of NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent150.050.0100.0100.0100.066.7300.0

us-gaap:GeneralAndAdministrativeExpense, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-18-18-18-18-20-20-20
Percentage of NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent900.0900.0900.0900.0666.7666.72000.0

us-gaap:GeneralAndAdministrativeExpense, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-31-19-20-19-29-29-30
Percentage of NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent1550.0950.01000.0950.0966.7966.73000.0

us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

country:US, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-09-302019-03-312018-09-30
Value-30-16-17-27
Percentage of NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent1500.0800.0850.0900.0

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-09-302019-03-312018-09-30
Value-4-4-4-5
Percentage of NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent200.0200.0200.0166.7

us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-20-20-20-20-23-23-21
Percentage of NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent1000.01000.01000.01000.0766.7766.72100.0

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-34-20-22-21-32-31-33
Percentage of NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent1700.01000.01100.01050.01066.71033.33300.0

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-2160-9970512401889-75-213-497-1211-259143434315-21322149451057-451-272-850
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value-1876-7058010191559-117-159-435-988-19392286207-1489143706824-411-255-67236194-290453420-95243
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesBeforeReclassificationAdjustmentsTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value-324-2712522532420-58-74-226-8251157102-63182245232-52-21
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesBeforeReclassificationAdjustmentsTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value-284-2912522133042-54-62-223-6651148108-64371239233264-17-17883-647-115-9356-49
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



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
Value-215556910271521-193-504-1008102302205165702673-300-648354-33346942921-1189-65
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-30
Value-30334349511252009-478-716-1088-837-587745501429-20189510271371-544-844-72036-393-581716472139-1686-340861140378-145295
Percentage of OtherComprehensiveIncomeLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax



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us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
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us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax



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us-gaap:OtherComprehensiveIncomeLossNetOfTax



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us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax



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us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax



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us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-30
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us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
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us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
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us-gaap:OtherComprehensiveIncomeLossTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
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us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
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us-gaap:OtherOperatingIncomeExpenseNet



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dei:LegalEntity

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us-gaap:ConsolidatedEntities

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srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
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Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-30
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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
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us-gaap:OtherThanTemporaryImpairmentLossDebtSecuritiesPortionRecognizedInEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
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us-gaap:OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities



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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
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Period End2020-03-312019-03-31
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Period End2020-03-31
Value1550
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Period End2020-03-31
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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-06-302010-03-31
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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
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us-gaap:PaymentsForProceedsFromShortTermInvestments



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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
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us-gaap:PaymentsForSecuritiesPurchasedUnderAgreementsToResell



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
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dei:LegalEntity

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
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us-gaap:PaymentsOfDividendsCommonStock



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us-gaap:ConsolidatedEntities

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
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us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-06-302010-03-31
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dei:LegalEntity

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Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
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us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
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Percentage of PaymentsToAcquireAvailableForSaleSecuritiesDebt0.20.20.00.10.20.20.1

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-06-302010-03-31
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dei:LegalEntity

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
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us-gaap:PaymentsToAcquireHeldToMaturitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-06-302010-03-31
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dei:LegalEntity

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value686707217643175162905055157936844772315321
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us-gaap:PaymentsToAcquireLimitedPartnershipInterests



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value361222173510410225299460353163140147198
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dei:LegalEntity

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value361222173510410225299460353163140147198
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us-gaap:PremiumsWrittenNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
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dei:LegalEntity

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Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value79778622834373138110801571047902758167107573763959954144470947844076
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us-gaap:StatementBusinessSegments

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value218109141197202117164197193
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cb:SegmentInsuranceNorthAmericanAgriculture



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value15727693846613019788438810812692640361408493756414273737988
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cb:SegmentInsuranceNorthAmericanCommercialPCMemberMember



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
Value3252345235342951319933312812308932042742311032452302143314281297
Percentage of PremiumsWrittenNet40.840.042.440.439.441.639.639.142.340.941.142.538.430.429.831.8

cb:SegmentInsuranceNorthAmericanPersonalPCMember



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value110711711251130910561073121813351048110011941255984104010111231871234278547133
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cb:SegmentInsuranceOverseasGeneral



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
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Percentage of PremiumsWrittenNet32.629.825.827.132.730.425.727.433.630.824.826.532.830.425.626.634.038.333.634.944.0

cb:SegmentLife



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value645622612579579582564565559555539523524549532527516515492500491
Percentage of PremiumsWrittenNet8.17.87.16.97.97.97.07.07.97.96.86.97.87.97.06.98.612.410.410.512.0

us-gaap:PresentValueOfFutureInsuranceProfitsAmortizationExpense1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value737676777686838585260-1296564163
Percentage of PresentValueOfFutureInsuranceProfitsAmortizationExpense1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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us-gaap:ProceedsFromContributionsFromParent

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1200040060011040037504250
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us-gaap:ConsolidationItems

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
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us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value4749606035292626344220474250254151424373933193540212843
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dei:LegalEntity

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value47496060352926263442204742502541514243739
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us-gaap:ProceedsFromLimitedPartnershipInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value211417193412368237330212201340257172315
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dei:LegalEntity

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
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us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-06-302010-03-31
Value275626492427213218311870156220551865272625302626254324133026235715531310156622101481159916511613155020161076817941962814
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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value274126262425212218251868156120441862271925212620253624062967235715531310156622101481
Percentage of ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities99.599.199.999.599.799.999.999.599.899.799.699.899.799.798.1100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value15232106211137
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us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-06-302010-03-31
Value44013221631828012326947725523523616824033118419424911782146324258203202212491345260396277293
Percentage of ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
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us-gaap:ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value952423410151347145755860640855545559075385355351853
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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
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us-gaap:ProceedsFromPaymentsForOtherFinancingActivities



Period End2020-03-312019-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-31
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us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-31
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us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-06-302010-03-31
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Percentage of ProceedsFromSaleOfAvailableForSaleSecuritiesDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-06-302010-03-31
Value1313431120660681644340354858463731171761334874283482771827312630317128183
Percentage of ProceedsFromSaleOfAvailableForSaleSecuritiesEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value131343112066068164434035485846373117176133487428
Percentage of ProceedsFromSaleOfAvailableForSaleSecuritiesEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromShortTermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value9524234101513471457558606408555455590753853553518535511518504771518505514266596811400
Percentage of ProceedsFromShortTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-30
Value-319-1112-44-38-81-231025-8332-152-4934
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RepaymentsOfShortTermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value9524214101516470453557605404555455586752856553498535501508504771508505514266584001300
Percentage of RepaymentsOfShortTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

us-gaap:PerformanceShares



Period End2020-02-272019-02-28
Value150.11133.9
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue100.0100.0

us-gaap:RestrictedStock



Period End2020-02-272019-02-282015-02-262014-02-272013-02-28
Value150.11133.9114.7896.7685.39
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue100.0100.00.00.00.0

us-gaap:RestrictedStockUnitsRSU



Period End2020-02-272019-02-282015-02-262014-02-272013-02-28
Value150.11133.9114.7896.7685.39
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue100.0100.00.00.00.0

us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod

us-gaap:PerformanceShares



Period End2020-02-272019-02-282018-02-222017-02-232016-02-25
Value203533.0212059.0180065.0202251.0452820.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod100.0100.0100.0100.0100.0

us-gaap:RestrictedStock



Period End2020-02-272019-02-282018-02-222017-02-232016-02-25
Value11011
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod492.5508.5540.7546.4247.3

us-gaap:RestrictedStockUnitsRSU



Period End2020-02-272019-02-282018-02-22
Value344501.0357463.0301024.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod169.3168.6167.2

us-gaap:StatementEquityComponents

us-gaap:StockGrantedDuringPeriodValueSharebasedCompensation

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-06-302010-03-31
Value-196661-191-5201-262-2-36-15-260-17-7-48-310-36-10-15302-15-154-114-95-28-83-1-68
Percentage of StockGrantedDuringPeriodValueSharebasedCompensation100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-31
Value208606758210724711217563058222702771274522540143392350144101
Percentage of StockGrantedDuringPeriodValueSharebasedCompensation-106.11000.01116.75800.0-109.9-138.50.01100.0-82.8-2800.0-83.3-386.7-85.4-411.8-385.7-147.9-88.4-1733.3416.7-400.0-93.50.01150.0-333.3-93.5-88.6

us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-06-302010-03-31
Value-26-17-17-14-34-7-23-3-16-15-5-17-21-20-7-16-21-18-14-11-18-14-11-15-18-12-1091105
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value46055091526048984326486251604668435844286567431840784087464045643965
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-120-226-208-183-228-338-243-191-209-48-270-170-289-232-371-310-291
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareRepurchaseProgram

us-gaap:TreasuryStockSharesAcquired

cb:Nov2019StockRepurchasePlan



Period End2020-03-31
Value2
Percentage of TreasuryStockSharesAcquired100.0

us-gaap:ShareRepurchaseProgram, us-gaap:SubsequentEventType

cb:Nov2019StockRepurchasePlan, us-gaap:SubsequentEvent



Period End2020-02-26
Value947400.0
Percentage of TreasuryStockSharesAcquired0.0

us-gaap:ShareRepurchaseProgram

us-gaap:TreasuryStockValueAcquiredCostMethod

cb:Nov2019StockRepurchasePlan



Period End2020-03-31
Value326
Percentage of TreasuryStockValueAcquiredCostMethod100.0

us-gaap:ShareRepurchaseProgram, us-gaap:SubsequentEventType

cb:Nov2019StockRepurchasePlan, us-gaap:SubsequentEvent



Period End2020-02-26
Value151
Percentage of TreasuryStockValueAcquiredCostMethod0.0

us-gaap:StatementEquityComponents

us-gaap:TreasuryStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value32631047837636731837932401232323351400000-14680394340-2468450237332
Percentage of TreasuryStockValueAcquiredCostMethod100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:UnderwritingIncomeLoss



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
Value824762713669690816618-811773742978616612648
Percentage of UnderwritingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

cb:SegmentGlobalReinsurance



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value44302039213551
Percentage of UnderwritingIncomeLoss5.33.92.85.83.04.38.3

cb:SegmentInsuranceNorthAmericanAgriculture



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
Value16153174873510091259387165377
Percentage of UnderwritingIncomeLoss1.92.04.311.112.64.316.2-11.23.212.58.92.68.711.9

cb:SegmentInsuranceNorthAmericanCommercialPCMemberMember



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
Value444419458413429492418-289458463426333401201
Percentage of UnderwritingIncomeLoss53.955.064.261.762.260.367.635.659.262.443.654.165.531.0

cb:SegmentInsuranceNorthAmericanPersonalPCMember



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
Value204201113982132-48-2321141711691122644
Percentage of UnderwritingIncomeLoss24.826.415.814.60.316.2-7.828.614.723.017.318.24.26.8

cb:SegmentInsuranceOverseasGeneral



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
Value149215206163209240202-3225691384190168290
Percentage of UnderwritingIncomeLoss18.128.228.924.430.329.432.73.933.112.339.330.827.544.8

cb:SegmentLife



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
Value44-6-7-44130-22-32-37-41-215047
Percentage of UnderwritingIncomeLoss5.3-0.8-1.0-6.61.90.0-3.63.9-4.8-5.5-2.10.80.07.3

us-gaap:Corporate



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-77-112-108-74-71-118-83-153-110-69
Percentage of UnderwritingIncomeLoss-9.3-14.7-15.1-11.1-10.3-14.5-13.418.9-14.2-9.3

us-gaap:InvestmentType

us-gaap:UnrealizedGainLossOnInvestments

cb:Equitysecuritiesandotherinvestments



Period End2020-03-312019-03-31
Value015
Percentage of UnrealizedGainLossOnInvestments0.0100.0

us-gaap:EquitySecurities



Period End2020-03-312019-03-312018-12-312018-09-302018-06-302018-03-31
Value-55741-13-7-21
Percentage of UnrealizedGainLossOnInvestments0.0380.00.00.00.00.0

us-gaap:OtherInvestments



Period End2020-03-312019-03-312018-09-302018-06-302018-03-31
Value5-425-1129
Percentage of UnrealizedGainLossOnInvestments0.0-280.00.00.00.0

us-gaap:WithdrawalFromContractHoldersFunds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value162828360781365364105968667586144544962526740110291914
Percentage of WithdrawalFromContractHoldersFunds100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value162828360781365364105968667586144544962526740
Percentage of WithdrawalFromContractHoldersFunds100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

cb:Affiliatednotionalcashpoolingprograms

srt:GuarantorSubsidiaries



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value060218069161781115
Percentage of Affiliatednotionalcashpoolingprograms0.0100.0100.0100.0100.0100.0100.0

srt:ParentCompany



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value740628177331351650
Percentage of Affiliatednotionalcashpoolingprograms0.0104.398.347.95.7203.70.0

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-740-1230-357-1022-652-246-115
Percentage of Affiliatednotionalcashpoolingprograms0.0-204.3-198.3-147.9-105.7-303.7-100.0

cb:Debtsecuritiesheldtomaturitynetcarryingvalue



Period End2020-03-31
Value12025
Percentage of Debtsecuritiesheldtomaturitynetcarryingvalue100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-31
Value12025
Percentage of Debtsecuritiesheldtomaturitynetcarryingvalue100.0

us-gaap:FairValueByMeasurementBasis, us-gaap:FinancialInstrument

us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:CorporateDebtSecurities



Period End2020-03-31
Value2236
Percentage of Debtsecuritiesheldtomaturitynetcarryingvalue18.6

us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-31
Value1287
Percentage of Debtsecuritiesheldtomaturitynetcarryingvalue10.7

us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:MortgageBackedSecurities



Period End2020-03-31
Value2265
Percentage of Debtsecuritiesheldtomaturitynetcarryingvalue18.8

us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-31
Value5029
Percentage of Debtsecuritiesheldtomaturitynetcarryingvalue41.8

us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:USTreasuryAndGovernment



Period End2020-03-31
Value1208
Percentage of Debtsecuritiesheldtomaturitynetcarryingvalue10.0

us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities



Period End2020-03-31
Value2236
Percentage of Debtsecuritiesheldtomaturitynetcarryingvalue18.6

us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-31
Value1287
Percentage of Debtsecuritiesheldtomaturitynetcarryingvalue10.7

us-gaap:MortgageBackedSecurities



Period End2020-03-31
Value2265
Percentage of Debtsecuritiesheldtomaturitynetcarryingvalue18.8

us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-31
Value5029
Percentage of Debtsecuritiesheldtomaturitynetcarryingvalue41.8

us-gaap:USTreasuryAndGovernment



Period End2020-03-31
Value1208
Percentage of Debtsecuritiesheldtomaturitynetcarryingvalue10.0

cb:FixedMaturitiesPercentofTotalAmortizedcost



Period End2020-03-31
Value1.0
Percentage of FixedMaturitiesPercentofTotalAmortizedcost100.0

us-gaap:CreditRatingStandardPoors

cb:Other



Period End2020-03-31
Value0.0
Percentage of FixedMaturitiesPercentofTotalAmortizedcost0.0

srt:StandardPoorsAAARating



Period End2020-03-31
Value0.22
Percentage of FixedMaturitiesPercentofTotalAmortizedcost22.0

srt:StandardPoorsAARating



Period End2020-03-31
Value0.55
Percentage of FixedMaturitiesPercentofTotalAmortizedcost55.0

srt:StandardPoorsARating



Period End2020-03-31
Value0.2
Percentage of FixedMaturitiesPercentofTotalAmortizedcost20.0

srt:StandardPoorsBBBRating



Period End2020-03-31
Value0.03
Percentage of FixedMaturitiesPercentofTotalAmortizedcost3.0

srt:StandardPoorsBBRating



Period End2020-03-31
Value0.0
Percentage of FixedMaturitiesPercentofTotalAmortizedcost0.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

cb:InvestmentDerivativeInstrumentsFairValue

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value64242215152829392518151215312012
Percentage of InvestmentDerivativeInstrumentsFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312018-09-30
Value0000026
Percentage of InvestmentDerivativeInstrumentsFairValue0.00.00.00.00.089.7

us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value642422151528553925181512153112
Percentage of InvestmentDerivativeInstrumentsFairValue100.0100.0100.0100.0100.0100.0189.7100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

cb:InvestmentDerivativeInstrumentsLiability

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value141936360523824422930373530543413
Percentage of InvestmentDerivativeInstrumentsLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value000104195115
Percentage of InvestmentDerivativeInstrumentsLiability0.00.00.0173.3375.0302.6

us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value1419363164247153244229303735305413
Percentage of InvestmentDerivativeInstrumentsLiability100.0100.0100.0273.3475.0402.6100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

cb:InvestmentsInSubsidiariesToBeEliminatedUponConsolidation

srt:GuarantorSubsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value5073152076533815197251996502095013251165
Percentage of InvestmentsInSubsidiariesToBeEliminatedUponConsolidation100.0100.0100.0100.0100.0100.0100.0100.0

srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value4957350853494714798345648435314352841909
Percentage of InvestmentsInSubsidiariesToBeEliminatedUponConsolidation97.797.792.792.387.886.786.881.9

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-100304-102929-102852-99955-97644-93740-93660-93074
Percentage of InvestmentsInSubsidiariesToBeEliminatedUponConsolidation-197.7-197.7-192.7-192.3-187.8-186.7-186.8-181.9

cb:Investmentsinpartiallyownedinsurancecompanies



Period End2020-03-312019-12-31
Value13461332
Percentage of Investmentsinpartiallyownedinsurancecompanies100.0100.0

cb:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyRevaluationAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-31
Value-565-19-162-186-621-440-9629232759617154-469-1554029682557173
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyRevaluationAndOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cb:OtherAssetsCondensed



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value19871186631860018982188201748418108178401738616918169191591515171145281492814076134501136610864
Percentage of OtherAssetsCondensed100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value21345200722001120266201701810218985187601845920701206991952718642184421885617962172911443414196
Percentage of OtherAssetsCondensed107.4107.5107.6106.8107.2103.5104.8105.2106.2122.4122.3122.7122.9126.9126.3127.6128.6127.0130.7

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value3404084864494881007678287
Percentage of OtherAssetsCondensed1.72.22.62.42.65.83.71.7

srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value612759333
Percentage of OtherAssetsCondensed0.00.10.00.00.00.00.00.0

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-1820-1829-1904-1738-1847-1628-1558-4073
Percentage of OtherAssetsCondensed-9.2-9.8-10.2-9.2-9.8-9.3-8.6-24.1

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

cb:OtherDerivativeInstrumentsFairValue

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-06-302017-03-312016-12-312016-09-30
Value2271572555078198314
Percentage of OtherDerivativeInstrumentsFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-06-302017-03-312016-12-31
Value22715725550781983
Percentage of OtherDerivativeInstrumentsFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cb:ReinsuranceRecoverableFuturePolicyBenefits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value196197199201203202206204181184193198187182195199185187217
Percentage of ReinsuranceRecoverableFuturePolicyBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value2882922932973063061109112711811194123212051145115311671185114411291194
Percentage of ReinsuranceRecoverableFuturePolicyBenefits146.9148.2147.2147.8150.7151.5538.3552.5652.5648.9638.3608.6612.3633.5598.5595.5618.4603.7550.2

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-92-95-94-96-103-104-903-1010
Percentage of ReinsuranceRecoverableFuturePolicyBenefits-46.9-48.2-47.2-47.8-50.7-51.5-438.3-548.9

cb:ReinsuranceRecoverableLossesAndLossExpenses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value14898151811552715445161371599315088147921498215034147991335813769135771344813235128911138611992
Percentage of ReinsuranceRecoverableLossesAndLossExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value24293247802528425297262322642226408271172609327514270072411824015244962364223071220652012420992
Percentage of ReinsuranceRecoverableLossesAndLossExpenses163.1163.2162.8163.8162.6165.2175.0183.3174.2183.0182.5180.6174.4180.4175.8174.3171.2176.7175.1

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-9395-9599-9757-9852-10095-10429-11320-12480
Percentage of ReinsuranceRecoverableLossesAndLossExpenses-63.1-63.2-62.8-63.8-62.6-65.2-75.0-83.0

cb:RestrictedAssetsDepositsWithNonUnitedStatesRegulatoryAuthorities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value2424270924762920290425312453246024632250236123252356219123382340226020752305
Percentage of RestrictedAssetsDepositsWithNonUnitedStatesRegulatoryAuthorities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cb:RestrictedAssetsDepositsWithUnitedStatesRegulatoryAuthorities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value2669246627062861285124052201220622902345229421702192220322322241252312421345
Percentage of RestrictedAssetsDepositsWithUnitedStatesRegulatoryAuthorities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cb:Securitieslendingcollateral



Period End2020-03-312019-12-31
Value1342994
Percentage of Securitieslendingcollateral100.0100.0

cb:Shortterminvestmentsamortizedcost



Period End2020-03-312019-12-312019-09-302018-12-31
Value3582429128383016
Percentage of Shortterminvestmentsamortizedcost100.0100.0100.0100.0

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value120551177312167116391121010472934389338618954591738952907386179748961490506205597760906194572658295419521848104917536157015377454242553724394846173288304129582349
Percentage of AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedInvestmentIncomeReceivable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value839867857850870883857870895909911901897918915919891513530534530552567556553556563536545552564542561547563538535521502
Percentage of AccruedInvestmentIncomeReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdditionalPaidInCapitalCommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value107101120311465117571205112557128531315013430139781421715335
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AlternativeInvestment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value50914921487148604464424443683623
Percentage of AlternativeInvestment100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentType

cb:DistressedAlternativeInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value262263264267263296301289
Percentage of AlternativeInvestment5.15.35.45.55.97.06.98.0

cb:Financial



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value590611568575591596514540
Percentage of AlternativeInvestment11.612.411.711.813.214.011.814.9

cb:InvestmentFundsAlternativeInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value26427125826325883278270
Percentage of AlternativeInvestment5.25.55.35.45.82.06.47.5

cb:PrivateCreditAlternativeInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value106104109116134147164187
Percentage of AlternativeInvestment2.12.12.22.43.03.53.85.2

cb:VintageAlternativeInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value103116134122125566930
Percentage of AlternativeInvestment2.02.42.82.52.81.31.60.8

us-gaap:PrivateEquityFunds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value30452844276727412331236223501656
Percentage of AlternativeInvestment59.857.856.856.452.255.753.845.7

us-gaap:RealEstateFunds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value721712771776762704692651
Percentage of AlternativeInvestment14.214.515.816.017.116.615.818.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:AssetsFairValueDisclosure

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value969510070859995069143880892038938904194518478732269826907722911187
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value80330838688304381331793507717177280777157826977995830288143380381798068129446230
Percentage of AssetsFairValueDisclosure828.6832.9965.7855.6867.9876.1839.7869.5865.7825.3979.31112.21151.31155.41124.6413.2

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value210520451992187718461774188418501678151513571166115610911077512
Percentage of AssetsFairValueDisclosure21.720.323.219.720.220.120.520.718.616.016.015.916.615.814.94.6

us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value921309598393634927149033987753883678850388988889619286389921885198780457929
Percentage of AssetsFairValueDisclosure950.3953.21088.9975.3988.1996.3960.2990.2984.3941.31095.31228.11267.81271.2517.8

us-gaap:AssetsHeldInTrust



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value1397414004143251451713943139881432417011
Percentage of AssetsHeldInTrust100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value2767307432102504148069070376998115281811169314961455285827191168
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value64411801131891476150248638
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax23.338.435.235.632.221.735.341.8

us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value85010991171942658395374622
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax30.735.836.537.644.557.253.240.7

us-gaap:MortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value8644945703981736626111
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax31.216.117.815.911.79.63.77.3

us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value1692052051761234942125
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax6.16.76.47.08.37.16.08.2

us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value240961339750301332
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax8.73.14.13.93.44.31.82.1

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value20201662022134411543148713521078424379411647876130204730
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value1374781089717075035895
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax68.047.053.545.538.548.624.122.4

us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value577626871112349299106
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax28.637.333.733.325.422.620.125.0

us-gaap:MortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value52141329112284523100
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax2.68.46.413.625.418.435.223.6

us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value171112142811720688
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax0.86.65.96.66.37.613.920.8

us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value0112194310135
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax0.00.60.50.94.32.86.88.3

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value809598258082036801197962479323786377854679208778358225480363799577953678630774367599143149474114759948384478264768848406
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value3153030689303442894027519271832490523453
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis38.937.237.036.134.634.331.730.1

us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value2261522670219742177721796213702128020514
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis27.927.526.827.227.426.927.126.4

us-gaap:MortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value1707318712184571759716369157581639515279
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis21.122.722.522.020.619.920.819.6

us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value696873217823826010180108541192014888
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis8.68.99.510.312.813.715.219.1

us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value27733188343835453760415841373701
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis3.43.94.24.44.75.25.34.8

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value237122487424309237112369023543233252369525097257042848828498279552737927645266852588712173137081454915649160891632316575164601653516650161791653916153158521469413929129951226711972110441078210067
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value258372772027728272812759327005266462658325251250682539724207244132442925865261742549215104167941680816735158571531015692147131460214450144931441714010131741280213091127221299713446133681344414905
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value102809729101049822916588148242839491979695108341064410441103871097410827103904487466246355176495748755379493948124705444547364764451143804078370036873535304328123359
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value6364566296660306444464233629306195563649
Percentage of AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value381639733889363037853568374238083746318235563823385139133413350137241865199519252042220623162537252824112345212120841906223123292354234920772074198519851352
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1788519192190141796616430155401589815483158201529015411144731414614007134611276412045995811119107841080810286103241141810971108941037997781017110473107361018110016102011054910011927885169842
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value815308548885044824108066378470778537796379111789398368681645808068011581358799517753843587482784870150410493954914851601496114925448529470164794747306465044438643468419674157741038387183753939525
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLoss



Period End2020-03-312019-12-31
Value1760
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLoss100.00.0

us-gaap:AdjustmentsForNewAccountingPronouncements

us-gaap:AccountingStandardsUpdate201613



Period End2020-03-31
Value25
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLoss14.2

us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities



Period End2020-03-31
Value132
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLoss75.0

us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-31
Value44
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLoss25.0

us-gaap:MortgageBackedSecurities



Period End2020-03-31
Value0.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLoss0.0

us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-31
Value0.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLoss0.0

us-gaap:USTreasuryAndGovernment



Period End2020-03-31
Value0.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLoss0.0

us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger

us-gaap:CorporateDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value4489881095183462064873
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger100.0100.0100.0100.0100.0100.0

us-gaap:ForeignGovernmentDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1328021014204242285349
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger29.581.292.6111.368.1109.8

us-gaap:MortgageBackedSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value369321228277989746913
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger8.094.3112.1151.5144.6141.9

us-gaap:USStatesAndPoliticalSubdivisions, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value130276371146748677768
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger29.027.933.980.078.4159.4

us-gaap:InvestmentType

us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value7463337423989582657327762
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger166.5337.8387.1488.4428.2569.7

us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss

us-gaap:CorporateDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value51405057142255
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss100.0100.0100.0100.0100.0100.0

us-gaap:ForeignGovernmentDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value2128465889159
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss41.270.092.0101.862.762.4

us-gaap:MortgageBackedSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value481128117229
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss7.820.022.049.182.489.8

us-gaap:USStatesAndPoliticalSubdivisions, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1112121636124
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss21.630.024.028.125.448.6

us-gaap:InvestmentType

us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value8788120162406817
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss170.6220.0240.0284.2285.9320.4

us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months

us-gaap:CorporateDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value13492212126002617364916538
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months100.0100.0100.0100.0100.0100.0

us-gaap:ForeignGovernmentDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value65341846107794613466764
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months48.487.041.436.136.940.9

us-gaap:MortgageBackedSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value91411746402893886103
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months6.855.424.611.010.636.9

us-gaap:USStatesAndPoliticalSubdivisions, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value63718865061935024
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months4.78.925.02.32.530.4

us-gaap:InvestmentType

us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value21577556351113954554434952
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months159.9262.3196.6151.1151.9211.3

us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss

us-gaap:CorporateDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value85840624962599
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss100.0100.0100.0100.0100.0100.0

us-gaap:ForeignGovernmentDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value37634231426208
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss43.885.037.128.641.934.7

us-gaap:MortgageBackedSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value48621198
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss5.615.03.22.01.616.4

us-gaap:USStatesAndPoliticalSubdivisions, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value6010044
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss0.70.01.60.00.07.3

us-gaap:InvestmentType

us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value128881886489953
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss150.1202.5141.9130.6143.5159.1

us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition

us-gaap:CorporateDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value13940310936954451985521411
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition100.0100.0100.0100.0100.0100.0

us-gaap:ForeignGovernmentDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value6666264820912988557412113
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition47.885.256.667.156.656.6

us-gaap:MortgageBackedSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value950210618683068936213016
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition6.867.750.668.995.060.8

us-gaap:USStatesAndPoliticalSubdivisions, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value76746410211528496012792
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition5.514.927.634.350.359.7

us-gaap:InvestmentType

us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value2232389009350129123211762714
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition160.1286.3253.0290.1325.9292.9

us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss

us-gaap:CorporateDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value90980112106204854
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss100.0100.0100.0100.0100.0100.0

us-gaap:ForeignGovernmentDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value397626972115367
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss43.777.561.667.956.443.0

us-gaap:MortgageBackedSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value52141329118327
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss5.717.511.627.457.838.3

us-gaap:USStatesAndPoliticalSubdivisions, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1712131636168
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss1.915.011.615.117.619.7

us-gaap:InvestmentType

us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value13751692082264951770
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss151.3211.2185.7213.2242.6207.3

us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLoss



Period End2020-03-312019-12-31
Value450
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLoss100.00.0

us-gaap:AdjustmentsForNewAccountingPronouncements

us-gaap:AccountingStandardsUpdate201613



Period End2020-03-31
Value44
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLoss97.8

us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities



Period End2020-03-31
Value36
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLoss80.0

us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-31
Value7
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLoss15.6

us-gaap:MortgageBackedSecurities



Period End2020-03-31
Value1000000.0
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLoss2.2

us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-31
Value1000000.0
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLoss2.2

us-gaap:USTreasuryAndGovernment



Period End2020-03-31
Value0.0
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLoss0.0

us-gaap:DeferredIncomeTaxLiabilitiesNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value47480476669754130436332646869911391122967988141814090
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:DeferredPolicyAcquisitionCosts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value516252425148511350084922490249164843472346914546440643144238394833762873280928062683260125922562240223132224207719661873179317101649176117921821172516411445
Percentage of DeferredPolicyAcquisitionCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementGeographical, us-gaap:SubsequentEventType, dei:LegalEntity

us-gaap:DepositAssets

country:CN, us-gaap:SubsequentEvent, cb:HuataiGroup



Period End2020-01-31
Value1550
Percentage of DepositAssets100.0

us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeAssetFairValueGrossLiability

us-gaap:FixedMaturities, us-gaap:ConvertiblesAndBondsWithWarrantsAttached



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value44568912975
Percentage of DerivativeAssetFairValueGrossLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherAssets, cb:OtherDerivatives



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value22115725187104421070
Percentage of DerivativeAssetFairValueGrossLiability50.050.020.0250.087.522.241.7200.0100.020.00.00.00.00.00.00.00.0

us-gaap:OtherAssets, cb:OtherDerivativesTotal



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value19271572555078109831470
Percentage of DerivativeAssetFairValueGrossLiability475.050.0140.0250.087.5277.841.7555.61114.320.00.00.00.00.00.00.00.0

us-gaap:OtherAssets, us-gaap:ForeignExchangeFuture



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value321110129151933191488122510107
Percentage of DerivativeAssetFairValueGrossLiability800.0275.0200.0200.0112.5166.7158.3366.7271.4280.00.00.00.00.00.00.00.0

us-gaap:OtherAssets, us-gaap:Future



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value15131236131066474361085
Percentage of DerivativeAssetFairValueGrossLiability375.0325.0240.050.075.0144.483.366.785.780.00.00.00.00.00.00.00.0

us-gaap:OtherAssets, us-gaap:SingleStockFuture



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value170600230327100541400
Percentage of DerivativeAssetFairValueGrossLiability425.00.0120.00.00.0255.60.0355.61014.30.00.00.00.00.00.00.00.0

us-gaap:DerivativeInstrumentRisk

cb:InvestmentAndEmbeddedDerivativeInstruments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value5128272123436748322315141733252043
Percentage of DerivativeAssetFairValueGrossLiability1275.0700.0540.0350.0287.5477.8558.3533.3457.1460.00.00.00.00.00.00.00.0

us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeFairValueOfDerivativeLiability

cb:BalanceSheetLocationAccountsPayableFuturePolicyBenefits, us-gaap:GuaranteedMinimumIncomeBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value1591897935815741861453550
Percentage of DerivativeFairValueOfDerivativeLiability100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccountsPayableAndAccruedLiabilities, cb:InvestmentAndEmbeddedDerivativeInstruments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value141936316424715324422930
Percentage of DerivativeFairValueOfDerivativeLiability8.910.46.720.133.317.85.30.00.05.5

us-gaap:AccountsPayableAndAccruedLiabilities, cb:OtherDerivatives



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value0000002222
Percentage of DerivativeFairValueOfDerivativeLiability0.00.00.00.00.00.00.40.00.00.4

us-gaap:AccountsPayableAndAccruedLiabilities, cb:OtherDerivativesTotal



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value01301012092223
Percentage of DerivativeFairValueOfDerivativeLiability0.01.40.01.21.60.02.00.00.04.2

us-gaap:AccountsPayableAndAccruedLiabilities, us-gaap:ForeignExchangeFuture



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value109785949281917361727
Percentage of DerivativeFairValueOfDerivativeLiability6.98.76.36.03.82.23.80.00.04.9

us-gaap:AccountsPayableAndAccruedLiabilities, us-gaap:Future



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value3215411241976123
Percentage of DerivativeFairValueOfDerivativeLiability2.01.70.41.33.22.21.50.00.00.5

us-gaap:AccountsPayableAndAccruedLiabilities, us-gaap:SingleStockFuture



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value01301012070021
Percentage of DerivativeFairValueOfDerivativeLiability0.01.40.01.21.60.01.50.00.03.8

us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value6775301402349524418110951-4411919434251441
Percentage of DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeNotionalAmount

cb:InvestmentAndEmbeddedDerivativeInstruments



Period End2020-03-312019-12-312019-09-302018-12-31
Value3760419937498543
Percentage of DerivativeNotionalAmount100.0100.0100.0100.0

cb:OtherDerivatives



Period End2020-03-312019-12-312019-09-302018-12-31
Value1036320774
Percentage of DerivativeNotionalAmount2.71.55.50.9

cb:OtherDerivativesTotal



Period End2020-03-312019-12-312019-09-302018-12-31
Value617676789581
Percentage of DerivativeNotionalAmount16.416.121.06.8

us-gaap:ConvertiblesAndBondsWithWarrantsAttached



Period End2020-03-312019-12-312019-09-302018-12-31
Value55811
Percentage of DerivativeNotionalAmount0.10.10.20.1

us-gaap:ForeignExchangeFuture



Period End2020-03-312019-12-312019-09-302018-12-31
Value2639257928882185
Percentage of DerivativeNotionalAmount70.261.477.025.6

us-gaap:Future



Period End2020-03-312019-12-312019-09-302018-12-31
Value111616158531046
Percentage of DerivativeNotionalAmount29.738.522.812.2

us-gaap:GuaranteedMinimumIncomeBenefit



Period End2020-03-312019-12-312019-09-302018-12-31
Value2680151017291750
Percentage of DerivativeNotionalAmount71.336.046.120.5

us-gaap:SingleStockFuture



Period End2020-03-312019-12-312019-09-302018-12-31
Value514613582507
Percentage of DerivativeNotionalAmount13.714.615.55.9

dei:LegalEntity

us-gaap:DueFromAffiliates

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value000-61616598111257251000000000
Percentage of DueFromAffiliates0.00.00.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidatedEntities

srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value36954776606862897358707479179639
Percentage of DueFromAffiliates0.00.00.0-10309.81194.51182.97132.40.0

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-3695-4776-6068-6228-7974-7672-8028-9639
Percentage of DueFromAffiliates0.00.00.010209.8-1294.5-1282.9-7232.40.0

dei:LegalEntity

us-gaap:DueToAffiliateCurrentAndNoncurrent

cb:OtherAceLimitedSubsidiariesAndEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value357330115000000207216312368273190143682444161
Percentage of DueToAffiliateCurrentAndNoncurrent100.0100.0100.00.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value33384446595362287974767280289432
Percentage of DueToAffiliateCurrentAndNoncurrent935.01347.35176.50.00.00.00.04556.5

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-3695-4776-6068-6228-7974-7672-8028-9639
Percentage of DueToAffiliateCurrentAndNoncurrent-1035.0-1447.3-5276.50.00.00.00.0-4656.5

dei:LegalEntity

us-gaap:EquityMethodInvestmentOwnershipPercentage

cb:HuataiGroup



Period End2020-03-312019-12-312018-12-31
Value0.3090.3090.2
Percentage of EquityMethodInvestmentOwnershipPercentage100.0100.0100.0

us-gaap:EquitySecuritiesFvNi



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value2068812722715821770
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value2001728662659766713
Percentage of EquitySecuritiesFvNi96.889.791.792.293.392.6

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value015400
Percentage of EquitySecuritiesFvNi0.01.80.60.00.0

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value676956565557
Percentage of EquitySecuritiesFvNi3.28.57.87.86.77.4

us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value2068812722715821770
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0

us-gaap:FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value294632633478357536423705321634413846406117301852189520401965210821128249161010
Percentage of FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentType

cb:DistressedAlternativeInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value6780899398105116131131141157175179179196200218
Percentage of FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments2.32.52.62.62.72.83.63.83.43.59.19.49.48.810.09.526.5

cb:Financial



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value325329360375188193281330
Percentage of FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments11.010.110.410.55.25.28.78.1

cb:PrivateCreditAlternativeInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value272272271269291310307308320327329337248259294335209
Percentage of FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments9.28.37.87.58.08.49.59.08.38.119.018.213.112.715.015.925.4

cb:VintageAlternativeInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-03-312016-12-312016-09-302016-06-30
Value00373943014141414
Percentage of FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments0.00.01.11.11.20.00.70.70.70.7

us-gaap:PrivateEquityFunds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value18682160222422572573273523263149
Percentage of FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments63.466.263.963.170.673.872.377.5

us-gaap:RealEstateFunds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value414422497542449362186114
Percentage of FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments14.112.914.315.212.39.85.82.8

us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue

us-gaap:CorporateDebtSecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value1502145114501359134212991174118110731037919747681
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312015-12-31
Value6769565655575359644452394116
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue4.54.83.94.14.14.44.55.06.04.25.75.26.00.0

us-gaap:ForeignGovernmentDebtSecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value46544939337136034532325217693908574
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue31.030.927.127.326.826.627.521.316.49.09.811.410.9

us-gaap:MortgageBackedSecurities, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value60607776786165828378444545
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue4.04.15.35.65.84.75.56.97.77.54.86.06.6

us-gaap:OtherLongTermInvestments, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312015-12-31
Value101010111111263264270263252243225212
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue0.70.70.70.80.80.822.422.425.225.427.432.533.00.0

us-gaap:ShortTermInvestments, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value1664016121200725
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue0.10.40.40.30.00.10.51.01.10.00.00.93.7

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass, us-gaap:GuaranteedInsuranceContractTypeOfBenefit

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue

us-gaap:FairValueInputsLevel3, us-gaap:Guarantees, us-gaap:GuaranteedMinimumIncomeBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value114145650940333845271125167204303357559
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:GuaranteedInsuranceContractTypeOfBenefit

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, us-gaap:GuaranteedMinimumIncomeBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-03-312016-12-31
Value114145650940333845271125204466559
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:GuaranteedInsuranceContractTypeOfBenefit

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, us-gaap:GuaranteedMinimumIncomeBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value114145650940333845271125167204303357466559
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:GuaranteedInsuranceContractTypeOfBenefit

us-gaap:GuaranteedMinimumIncomeBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value114145650940333845271125167204303357466559883971839609744347451406193
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.00.00.00.00.00.00.00.0

us-gaap:GuaranteedInsuranceContractTypeOfBenefit

us-gaap:GuaranteedBenefitLiabilityNet

us-gaap:GuaranteedMinimumIncomeBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value15918979358157418614534975295506356847748531200130011008881000615716663427
Percentage of GuaranteedBenefitLiabilityNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:HeldToMaturitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value12070125811262212838131361343513563138601425314335101601037110519106441092711090112808430856486766982733175485774588760986306657668677270749377828117844787319033927095013481
Percentage of HeldToMaturitySecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CreditRatingStandardPoors

cb:Other



Period End2020-03-31
Value6
Percentage of HeldToMaturitySecurities0.0

srt:StandardPoorsAAARating



Period End2020-03-31
Value2642
Percentage of HeldToMaturitySecurities21.9

srt:StandardPoorsAARating



Period End2020-03-31
Value6608
Percentage of HeldToMaturitySecurities54.7

srt:StandardPoorsARating



Period End2020-03-31
Value2371
Percentage of HeldToMaturitySecurities19.6

srt:StandardPoorsBBBRating



Period End2020-03-31
Value422
Percentage of HeldToMaturitySecurities3.5

srt:StandardPoorsBBRating



Period End2020-03-31
Value21
Percentage of HeldToMaturitySecurities0.2

us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value22722349239124572543260126583159
Percentage of HeldToMaturitySecurities18.818.718.919.119.419.419.622.0

us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value12941423140114651503154916011738
Percentage of HeldToMaturitySecurities10.711.311.111.411.411.511.812.1

us-gaap:MortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value22662331239124422484252425742724
Percentage of HeldToMaturitySecurities18.818.518.919.018.918.819.019.0

us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value50305160520553075462557656185806
Percentage of HeldToMaturitySecurities41.741.041.241.341.641.541.440.5

us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value1208131812341167114411851112908
Percentage of HeldToMaturitySecurities10.010.59.89.18.78.88.26.3

us-gaap:HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value48742748035215851416081179216207159148441497323190235209-327-266-228-187
Percentage of HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-312019-09-3