CB


Line plots across dimensions of each concept
Line plots across concepts
Tables

Table of contents



us-gaap:CommonStockValue
us-gaap:ConsolidatedEntities

us-gaap:CommonStockParOrStatedValuePerShare

us-gaap:CommonStockSharesIssued

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:BenefitsLossesAndExpenses

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

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense
us-gaap:StatementBusinessSegments

us-gaap:GeneralAndAdministrativeExpense
us-gaap:ConsolidatedEntities
us-gaap:StatementBusinessSegments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

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

us-gaap:IncomeTaxesPaidNet

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

us-gaap:InterestPaidNet

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

us-gaap:NetInvestmentIncome
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems
us-gaap:StatementBusinessSegments
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherNonoperatingIncomeExpense

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

us-gaap:PremiumsEarnedNet

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

us-gaap:Revenues

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:CumulativeEffectPeriodOfAdoption, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:CashAndCashEquivalentsAtCarryingValue
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

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

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

us-gaap:PropertyPlantAndEquipmentNet
us-gaap:PropertyPlantAndEquipmentByType

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

us-gaap:Goodwill
us-gaap:StatementBusinessSegments

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:IntangibleAssetsNetIncludingGoodwill
dei:LegalEntity

us-gaap:OperatingLeaseRightOfUseAsset

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

us-gaap:OtherAssets
us-gaap:ConsolidatedEntities

us-gaap:LongTermDebt

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

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

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

us-gaap:CommonStockValue
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:AdditionalPaidInCapital

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:RetainedEarningsAccumulatedDeficit
us-gaap:ConsolidatedEntities

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
us-gaap:ConsolidatedEntities

us-gaap:TreasuryStockValue
us-gaap:ConsolidatedEntities
us-gaap:StatementEquityComponents
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

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

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

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

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

us-gaap:ProceedsFromIssuanceOfLongTermDebt
us-gaap:ConsolidatedEntities

us-gaap:PaymentsOfDividendsCommonStock
us-gaap:ConsolidatedEntities

us-gaap:PaymentsForRepurchaseOfCommonStock
us-gaap:ConsolidatedEntities

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:DeferredTaxLiabilities

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance
dei:LegalEntity
cb:AdvancesToFromAffiliatesFinancingActivities
us-gaap:ConsolidatedEntities

cb:DebtSecuritiesAvailableForSaleCreditImpairmentChargesIntenttoSell
us-gaap:InvestmentType
us-gaap:ConsolidatedEntities
cb:EquityInEarningsOfSubsidiaries
us-gaap:ConsolidationItems
dei:LegalEntity, us-gaap:StatementGeographical, us-gaap:SubsequentEventType
cb:Equitymethodinvestmentadditional15.3ownershippercentageobtained
us-gaap:StatementEquityComponents
cb:FundingDividendsDeclaredFromAdditionalPaidInCapital
us-gaap:StatementEquityComponents
cb:FundingDividendsDeclaredToRetainedEarnings

cb:GainsLossesOnFairValueChangesInSeparateAccountAssets

cb:LiabilityforUnpaidClaimsandClaimsAdjustmentExpensePeriodIncreaseDecreaseGross

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

cb:NetRealizedGainsLosses

cb:NetrealizedgainslossesexcludingOTTI

cb:PaymentIncludingDepositForHuataiGroupInterest
us-gaap:ConsolidatedEntities
cb:PaymentOfContributionsToSubsidiary
us-gaap:ConsolidationItems

cb:PolicyAcquisitionCostsAndAdministrativeExpenses
dei:LegalEntity
us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:StatementGeographical
cb:Portiononeofpaymentstoacquire22.4ofHuataiGroup

cb:PriorPeriodDevelopmentnetadjustments

cb:ProceedsFromSaleOfAvailableForSaleSecuritiesDebtCondensed
dei:LegalEntity
us-gaap:ConsolidatedEntities

cb:ReinsuranceRecoverableAllowanceForCreditLossOther

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

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments

us-gaap:AdditionsToContractHoldersFunds
dei:LegalEntity
dei:LegalEntity
us-gaap:CashDividendsPaidToParentCompany
us-gaap:ConsolidationItems
us-gaap:Currency
us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease
us-gaap:AdjustmentsForNewAccountingPronouncements
us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossRecovery

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossWriteoff

us-gaap:DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate

us-gaap:DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAmountAtParValue

us-gaap:DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAmountAtPurchasePrice
us-gaap:InvestmentType
us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss
us-gaap:InvestmentType
us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment
us-gaap:InvestmentType
us-gaap:DebtSecuritiesAvailableForSaleRealizedLossExcludingOtherThanTemporaryImpairment

us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLossPeriodIncreaseDecrease

us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLossRecovery
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
us-gaap:RetirementPlanType
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:StatementEquityComponents
us-gaap:DividendsCommonStockCash

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:InvestmentType
us-gaap:EquitySecuritiesFvNiRealizedGainLoss

us-gaap:ExciseAndSalesTaxes
us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass, us-gaap:GuaranteedInsuranceContractTypeOfBenefit
us-gaap:FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:GuaranteedInsuranceContractTypeOfBenefit
us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass, us-gaap:GuaranteedInsuranceContractTypeOfBenefit
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:GuaranteedInsuranceContractTypeOfBenefit
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:GuaranteedInsuranceContractTypeOfBenefit
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease

us-gaap:FairValueOptionChangesInFairValueGainLoss1

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

us-gaap:GainLossOnSaleOfOtherInvestments

us-gaap:GoodwillPeriodIncreaseDecrease

us-gaap:IncomeLossFromEquityMethodInvestments
dei:LegalEntity

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

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpensePeriodIncreaseDecrease
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:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesBeforeReclassificationAdjustmentsTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

us-gaap:OtherComprehensiveIncomeLossBeforeTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax

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

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

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax

us-gaap:OtherNonoperatingExpense

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

us-gaap:PaymentsForLossesAndLossAdjustmentExpense

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

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:PaymentsToAcquireAvailableForSaleSecuritiesDebt
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesEquity
dei:LegalEntity
us-gaap:BusinessAcquisition
us-gaap:PaymentsToAcquireBusinessesGross

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:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesEquity
dei:LegalEntity

us-gaap:ProceedsFromShortTermDebt

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax

us-gaap:ReinsuranceLossOnUncollectibleAccountsInPeriodAmount

us-gaap:ReinsuranceRecoverableCreditLossExpenseReversal

us-gaap:RepaymentsOfShortTermDebt
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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:SubsequentEventType
us-gaap:TaxAdjustmentsSettlementsAndUnusualProvisions
us-gaap:StatementEquityComponents
us-gaap:TreasuryStockRetiredCostMethodAmount
us-gaap:ShareRepurchaseProgram
us-gaap:TreasuryStockSharesAcquired
us-gaap:ShareRepurchaseProgram, us-gaap:SubsequentEventType
us-gaap:SubsequentEventType
us-gaap:ShareRepurchaseProgram
us-gaap:TreasuryStockValueAcquiredCostMethod
us-gaap:ShareRepurchaseProgram, us-gaap:SubsequentEventType
us-gaap:StatementEquityComponents
us-gaap:SubsequentEventType

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

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

cb:AllowanceForReinsuranceRecoverablePercentage
us-gaap:CededCreditRisk

cb:Annualdividendpershareapprovedbyshareholders
us-gaap:ShareRepurchaseProgram
cb:CB_IncreaseDecreaseStockRepurchaseProgramAuthorizedAmount
us-gaap:ShareRepurchaseProgram, us-gaap:SubsequentEventType
us-gaap:StatementOperatingActivitiesSegment
cb:CenturyAggregateReinsuranceBalancesCededByActiveCompanies
us-gaap:StatementOperatingActivitiesSegment
cb:CenturyXOLReinsuranceCoverage

cb:CommonStockDividendRateApproved

cb:CommonStockMaximumOwnershipPercentageForVoting

cb:DebtSecuritiesHeldToMaturityMaturityAllocatedAndSingleMaturityDateAfter10YearsNetCarryingValue

cb:DebtSecuritiesHeldToMaturityMaturityAllocatedAndSingleMaturityDateAfterFiveThroughTenYearsNetCarryingValue

cb:DebtSecuritiesHeldToMaturityMaturityAllocatedAndSingleMaturityDateAfterOneThroughFiveYearsNetCarryingValue

cb:DebtSecuritiesHeldToMaturityMaturityAllocatedAndSingleMaturityDateNetCarryingValue

cb:DebtSecuritiesHeldToMaturityMaturityAllocatedAndSingleMaturityDateWithinOneYearNetCarryingValue

cb:DebtSecuritiesHeldToMaturityWithoutSingleMaturityDateNetCarryingValue

cb:DebtsecuritiesHeldtomaturitymaturityallocatedandsinglematuritydateafter10yearsnetcarryingvalue

cb:DebtsecuritiesHeldtomaturitymaturityallocatedandsinglematuritydateafterfivethroughtenyearsnetcarryingvalue

cb:DebtsecuritiesHeldtomaturitymaturityallocatedandsinglematuritydateafteronethroughfiveyearsnetcarryingvalue

cb:DebtsecuritiesHeldtomaturitymaturityallocatedandsinglematuritydatenetcarryingvalue

cb:DebtsecuritiesHeldtomaturitymaturityallocatedandsinglematuritydatewithinoneyearnetcarryingvalue

cb:DebtsecuritiesHeldtomaturitymaturitywithoutsinglematuritydatenetcarryingvalue

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

cb:DeferredTaxAssetLeaseLiability
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cb:InvestmentDerivativeInstrumentsLiability
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cb:InvestmentsInSubsidiariesToBeEliminatedUponConsolidation
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cb:Investmentsinpartiallyownedinsurancecompanies

cb:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyRevaluationAndOther
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cb:MakeWholePremiumAdditionalPercent
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cb:NationalIndemnityCompanyReinsuranceProtection
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cb:NationalIndemnityCompanyReinsuranceProtection1998Agreement
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cb:NetFundedStatusWithPBOinExcessOfPlanAssets

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cb:PriorPeriodDevelopmentPercentageOpeningNetUnpaidReserves
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cb:ReinsuranceRecoverableOnLossesAndLossExpenses

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cb:RestrictedAssetsDepositsWithUnitedStatesRegulatoryAuthorities

cb:RestrictedAssetsOtherPledgedAssets

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cb:TotalInvestmentsIncludingInvestmentsInSubsidiariesAndAffiliatesOnEquityBasis
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cb:WarrantsRightsOutstanding

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us-gaap:FiniteLivedIntangibleAssetsByMajorClass

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us-gaap:CreditRatingStandardPoors
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us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
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us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue

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us-gaap:HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue

us-gaap:HeldToMaturitySecuritiesFairValue

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us-gaap:ConsolidatedEntities

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us-gaap:StatementBusinessSegments

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us-gaap:FairValueByMeasurementBasis

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us-gaap:OperatingLossCarryforwards

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us-gaap:FinancialInstrument

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us-gaap:PresentValueOfFutureInsuranceProfitsAmortizationExpenseYearFour

us-gaap:PresentValueOfFutureInsuranceProfitsAmortizationExpenseYearOne

us-gaap:PresentValueOfFutureInsuranceProfitsAmortizationExpenseYearThree

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us-gaap:ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments
us-gaap:ProductOrService
us-gaap:ReinsuranceRecoverables

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us-gaap:ReinsuranceRecoverablesOnPaidAndUnpaidLosses

us-gaap:ReinsuranceRecoverablesOnPaidLosses

us-gaap:ReinsuranceRecoverablesOnPaidLossesAllowance

us-gaap:ReinsuranceRecoverablesOnUnpaidLossesAllowance

us-gaap:ReinsuranceRecoverablesOnUnpaidLossesGross
us-gaap:StatementBusinessSegments

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us-gaap:RestrictedCashAndCashEquivalents

us-gaap:RestrictedCashAndInvestments

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

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

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us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

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us-gaap:ShortTermBorrowings
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us-gaap:FairValueByMeasurementBasis
us-gaap:ShortTermDebtType
us-gaap:ShortTermDebtType
us-gaap:ShortTermDebtWeightedAverageInterestRate
us-gaap:StatementBusinessSegments
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us-gaap:StatementBusinessSegments
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us-gaap:StatementBusinessSegments
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us-gaap:StatementBusinessSegments
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us-gaap:StatementBusinessSegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearOne
us-gaap:StatementBusinessSegments
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us-gaap:StatementBusinessSegments
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us-gaap:StatementBusinessSegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearTen
us-gaap:StatementBusinessSegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearThree
us-gaap:StatementBusinessSegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearTwo

us-gaap:ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndAllocatedClaimAdjustmentExpenseNet
us-gaap:StatementBusinessSegments
us-gaap:ShortdurationInsuranceContractsAccidentYear, us-gaap:StatementBusinessSegments
us-gaap:ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndAllocatedClaimAdjustmentExpenseNetNotSeparatelyPresented

us-gaap:ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndClaimAdjustmentExpenseAggregateReconcilingItems

us-gaap:ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseAccumulatedUnallocatedClaimAdjustmentExpense
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:ShorttermDebtFairValue
us-gaap:FairValueByMeasurementBasis

us-gaap:StateInsuranceDepartmentStatutoryToNAICAmountOfReconcilingItem

us-gaap:StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPayments
us-gaap:ProductOrService
us-gaap:StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance

us-gaap:StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired
us-gaap:ShareRepurchaseProgram
us-gaap:StockRepurchaseProgramAuthorizedAmount1
us-gaap:ShareRepurchaseProgram, us-gaap:SubsequentEventType
us-gaap:ShareRepurchaseProgram
us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
us-gaap:ShareRepurchaseProgram, us-gaap:SubsequentEventType

us-gaap:SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:InvestmentType

us-gaap:SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:InvestmentType

us-gaap:SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:InvestmentType

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersDeferredPolicyAcquisitionCosts

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersReservesForUnpaidClaimsAndClaimsAdjustmentExpense

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersUnearnedPremiums
us-gaap:IncomeTaxAuthority
us-gaap:TaxCreditCarryforwardAmount

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

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

us-gaap:ValueOfBusinessAcquiredVOBA
dei:LegalEntity

Plots across concepts


IncomeStatement
Other Comprehensive Income Loss Net Of Tax
Expenses
Income Tax Expense Benefit
Balance Sheet
Operating Lease Right Of Use Asset
Assets
Operating Lease Right Of Use Asset
Current Assets
Cash And Cash Equivalents At Carrying Value
NonCurrent Assets
Operating Lease Right Of Use Asset
Liabilities
Operating Lease Liability
Noncurrent Liabilities
Deferred Income Tax Liabilities Net
Stockholders Equity
Accumulated Other Comprehensive Income Loss Net Of Tax
CashFlow
Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInOperatingActivities
Net Income Loss
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInFinancingActivities
Net Cash Provided By Used In Financing Activities
Shares
Weighted Average Number Of Shares Outstanding Basic
DividendsAndRepurchase
Payments Of Dividends Common Stock
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Undiscounted Excess Amount

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:CommonStockValue ██████████████████████▁▁▁▁▁▂▂▃▃▄▄▄▅▅▅▆▆▆▆▆▆11064.011064.011064.011064.011121.011121.011121.011121.011121.011121.011121.011121.011121.011121.011121.011121.011121.011121.011121.011121.011121.011121.07833.07833.07833.07833.08055.08278.08501.08724.08899.09073.09249.09423.09591.09759.09927.010095.010095.010095.010098.010075.010161.0NANANA10503.0NANANA
us-gaap:CommonStockParOrStatedValuePerShare ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▂▃▄▄▅▅▆▆▇▇██████2.4149999999999997e-052.4149999999999997e-052.4149999999999997e-052.4149999999999997e-052.4149999999999997e-052.4149999999999997e-052.4149999999999997e-052.4149999999999997e-052.4149999999999997e-052.4149999999999997e-052.4149999999999997e-052.4149999999999997e-052.4149999999999997e-052.4149999999999997e-052.4149999999999997e-052.4149999999999997e-052.4149999999999997e-052.4149999999999997e-052.4149999999999997e-052.4149999999999997e-052.4149999999999997e-052.4149999999999997e-052.4149999999999997e-052.4149999999999997e-052.4149999999999997e-052.4149999999999997e-052.477e-052.5399999999999997e-052.601e-052.659e-052.704e-052.749e-052.795e-052.843e-052.889e-052.934e-052.9789999999999998e-053.027e-053.027e-053.027e-053.027e-053.027e-053.057e-05NANANANANANANA
us-gaap:CommonStockSharesIssued NANA477.605264NA479.783864479.783864479.783864479.783864479.783864479.783864479.783864479.783864479.783864479.783864479.783864479.783864479.783864479.783864479.783864479.783864479.783864479.783864342.832412342.832412342.832412342.832412342.832412342.832412342.832412342.832412342.832412342.832412342.832412342.832412342.832412342.832412342.832412342.832412342.832412342.832412342.77507341.995324341.094559NANANA337.841616NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding ▁█447.95192453.335539NA453.26548451.402807454.520268NA458.150369460.169692461.53694NA466.016498468.380324469.473591NA466.370784471.853937472.73169NA471.396362471.157297450.009742NA327.17342328.685758331.69272NA337.67398341.132587342.040736NA343.817737344.101265343.906368NA342.872713342.674038341.690982NA338.385734341.688968339.661199NA341.855519341.243656339.865476NANANANA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic ▁█445.094678450.539568NA451.794046451.402807451.868658NA454.975143457.224455458.805185NA462.981973465.276597465.70324NA466.370784467.981077468.903086NA468.021093467.701328446.739586NA324.210936325.463196328.212376NA334.472324337.846228338.869562NA340.888648341.04729340.778142NA340.207037339.766067338.567341NA338.385734338.92058337.088217NA340.218717339.975261338.478484NANANANA
us-gaap:EarningsPerShareBasic ███▅▁▂▅▅▅▄▃▅▅▅▆▂▅▅▆▅▄▃▄▄▅▄▄▅▄▄▅▅▅▅▄▄▃▅▄▂▄▃▅▄▄▄▅▄▄▄5.095.15.352.64-0.730.562.592.42.522.270.772.662.782.323.29-0.152.792.333.442.91.550.982.11.632.892.081.682.352.32.162.932.682.612.82.241.880.962.872.22-0.091.790.772.941.981.992.232.821.461.581.69
us-gaap:EarningsPerShareDiluted ███▅▁▂▅▅▅▄▃▅▅▄▆▂▅▅▆▅▄▃▄▄▅▄▄▅▄▄▅▅▅▅▄▄▃▅▄▂▄▃▅▄▄▄▅▄▄▄5.065.075.332.63-0.730.552.572.382.52.250.762.642.762.33.27-0.152.772.313.412.881.540.972.081.622.862.051.662.322.282.142.92.662.592.772.221.860.962.842.2-0.091.770.762.921.971.982.222.811.461.581.69
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:BenefitsLossesAndExpenses ▆▆▆▇█▆▆▆▆▅▆▆▅▅▅▇▅▅▅▅▅▅▂▂▂▂▂▂▂▂▂▂▂▁▂▃▂▁▂▂▂▂▁▁▁▁7082.07333.07096.08128.09378.07230.07396.07724.07169.06648.07112.07336.06998.06614.06864.08765.06603.06289.06299.06890.07016.06314.03929.04211.03963.03588.03950.04239.03903.03592.03988.04101.03699.03235.04057.04351.03450.03102.03607.04160.03524.03452.03275.03053.02941.03070.0NANANANA
us-gaap:ComprehensiveIncomeNetOfTax █▄█▆▇▁▅▆▆▇▄▅▄▄▅▅▆▆▄▆▆▆▄▄▄3129.0389.03431.01952.02860.0-2460.01271.01473.02059.02718.0-80.0592.0277.0453.01007.0629.01675.01407.099.01376.01540.01541.0140.0-271.0397.0NANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense ████▇█▇▇▇▇▇▇▇▇▆▇▆▆▆▇▇▆▂▂▂▂▂▃▂▂▂▂▂▁▂▁▂▁▂▂▁▁▂▁▁▁1698.01665.01694.01645.01593.01615.01542.01603.01544.01464.01480.01504.01464.01464.01447.01488.01449.01397.01417.01514.01560.01413.0736.0771.0727.0707.0764.0825.0758.0728.0702.0678.0665.0614.0636.0609.0619.0582.0622.0666.0604.0555.0640.0607.0536.0554.0NANANANA
us-gaap:GeneralAndAdministrativeExpense ▇▆▇▆▆▆█▇▇▆▆▆▇▆▆▆▆▅▆▇█▇▃▃▄▃▄▃▃▃▃▃▃▂▃▃▂▂▃▂▂▂▂▁▂▁775.0744.0778.0733.0727.0741.0810.0752.0758.0710.0728.0719.0747.0692.0737.0714.0706.0676.0708.0772.0829.0772.0570.0568.0578.0554.0590.0554.0566.0535.0570.0563.0564.0514.0553.0519.0514.0510.0526.0517.0515.0494.0502.0433.0463.0460.0NANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ███▅▁▃▅▅▅▅▃▅▅▅▄▂▅▅▆▆▄▃▄▃▄▄2582.02638.02752.01336.0-393.0467.01342.01321.01358.01228.0514.01414.01512.01217.01151.0-155.01505.01221.01869.01637.0881.0563.0750.0660.01085.0801.0NANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IncomeTaxExpenseBenefit ███▆▄▇▆▇▇▇▆▆▇▆▁▄▇▆▇▇▆▆▅▆▆▆▇▆▆▆▆▆▆▆▃▆▆▆▆▆▆▆▆▆▆▆317.0338.0334.0142.0-62.0215.0169.0230.0208.0188.0159.0183.0218.0135.0-382.0-85.0200.0128.0259.0277.0155.0124.067.0132.0143.0120.0232.0176.0133.093.088.0155.0115.0122.0-135.0147.0148.0110.0122.0165.0122.097.0133.0160.0142.0124.0NANANANA
us-gaap:IncomeTaxesPaidNet ▆▄▄▄▆▂▃▄█▁▃▂▃▂▂▃▇▂▅▂▃▂▃▂▃▂▂▂▂▂▂▂▁▁▂▂▃▂▃▁▄▁▃▁▃▂395.0236.0234.0226.0335.0107.0179.0211.0508.014.0190.090.0130.093.084.0142.0456.054.0302.0101.0153.0106.0134.072.0167.096.099.0102.088.060.068.062.045.043.0115.064.0187.072.0154.041.0219.046.0138.040.0181.075.0NANANANA
us-gaap:InterestIncomeExpenseNet ▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▂▂▁▁▁▁▂▃▄▄▄▄▄▄▄▄▄▄▄▄▄██▄▄██-122.0-122.0-126.0-130.0-128.0-132.0-134.0-138.0-140.0-140.0-153.0-164.0-167.0-157.0-156.0-150.0-147.0-154.0-154.0-152.0-153.0-146.0-93.0-68.0-71.0-68.0-67.0-70.0-72.0-71.0-70.0-72.0-73.0-60.0-63.0-63.062.062.0-63.0-62.062.063.0NANANANANANANANA
 us-gaap:InterestIncomeExpenseNet dei:LegalEntity cb:OtherAceLimitedSubsidiariesAndEliminationsNANANA-13.0-14.0-18.0NA-26.0-22.0-21.0NA-36.0-39.0-28.0NA-26.0-19.0-17.0NA-12.0-13.0-11.0-6.0-8.0-9.0-7.0NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InterestIncomeExpenseNet us-gaap:ConsolidatedEntities srt:GuarantorSubsidiariesNA145.0NA-151.0-149.0-148.0NA-171.0-180.0-185.0NA-203.0-204.0-209.0NA-208.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InterestIncomeExpenseNet us-gaap:ConsolidatedEntities srt:ParentCompanyNA-34.033.034.035.034.056.059.062.066.068.075.076.080.080.084.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InterestIncomeExpenseNet us-gaap:StatementBusinessSegments us-gaap:Corporate▄▄-122.0-122.0NA-130.0-128.0-132.0NA-138.0-140.0-140.0NA-164.0-167.0-157.0NA-150.0-147.0-154.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:InterestPaidNet ▆▃▆▁▆▃▆▁▆▃▇▂█▃█▃█▂█▂█▂▂▂▃▂▃▂▃▂▃▂▃▁▃▁▃▁▃▁▃▁▂▁▂▁181.090.0201.037.0195.091.0185.041.0201.085.0218.071.0250.082.0240.077.0252.075.0252.071.0248.071.071.061.079.048.078.052.083.051.084.052.086.031.084.037.082.037.083.039.081.031.074.029.072.029.0NANANANA
us-gaap:NetIncomeLoss ███▅▁▂▅▅▅▄▃▅▅▅▆▂▅▅▆▅▄▃▄▃▄▄▃▄▄▄▄▄▄▄▄▃▃▄▄▂▃▃▄▄▄▄▄▃▃▃2265.02300.02418.01194.0-331.0252.01173.01091.01150.01040.0355.01231.01294.01082.01533.0-70.01305.01093.01610.01360.0726.0439.0683.0528.0942.0681.0555.0785.0779.0734.0998.0916.0891.0953.0765.0640.0328.0973.0750.0-31.0607.0259.01001.0675.0677.0755.0953.0494.0535.0567.0
us-gaap:NetInvestmentIncome ██▇▇▇█▇██▇▇▇▇▆▆▇▆▅▅▅▄▄▁▁▂▁884.0863.0847.0840.0827.0861.0858.0873.0859.0836.0848.0823.0828.0806.0797.0813.0770.0745.0744.0739.0708.0674.0532.0549.0562.0551.0NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax us-gaap:StatementEquityComponents us-gaap:AccumulatedTranslationAdjustment▆▅▇▆▇▁▆▄▄▆▄▃▂▇▃█▅▆▃▄▅▆▄▂▆▃▂▄▅▅▅▅▄▄▅▆▅▅▄▄290.024.0443.0233.0451.0-825.0177.0-185.0-95.0140.0-113.0-462.0-570.0378.0-411.0658.098.0131.0-375.0-131.0105.0277.0-133.0-547.0132.0-410.0-520.0-202.0119.0-41.0-66.0114.0-168.0-156.0-37.0141.0-79.056.0-123.0-105.0NANANANANANANANANANA
us-gaap:OtherComprehensiveIncomeLossNetOfTax ▅▂▅▅█▁▄▅▅▆▄▃▃▃▄▅▅▅▂▄▅▆▄▃▄▄▄▄▅▅▄▄▃▄▄▅▄▅▄▄▄864.0-1911.01013.0758.03191.0-2712.098.0382.0909.01678.0-435.0-639.0-1017.0-629.0-526.0699.0370.0314.0-1511.016.0814.01102.0-543.0-799.0-545.0-39.0-417.0-487.0569.0374.0-222.0114.0-1390.0-237.0-127.0676.0129.0298.072.0-150.0207.0NANANANANANANANANA
us-gaap:OtherNonoperatingIncomeExpense 777.0NANANA-58.0NANANANANANANANANANANANANANANANA-28.0-10.0-12.0-17.05.021.019.025.017.07.05.0-37.010.020.017.0-34.03.09.0-87.0-9.014.0-10.025.0-3.04.0NANANANA
us-gaap:PolicyholderBenefitsAndClaimsIncurredNet ▆▆▅▇█▅▅▆▅▄▅▅▅▄▅█▄▄▄▅▅▄▂▂▂▁▂▂▂▂▂▂▂▁▂▃▁▁▂▂▂▂▁▁▁▁▁▁▁▁5006.05053.04813.05835.06577.04485.04865.05052.04715.04098.04610.04868.04487.04102.04272.06247.04146.03789.03855.04269.04254.03674.02302.02643.02417.02122.02416.02684.02388.02161.02517.02655.02250.01926.02683.03047.02119.01804.02286.02745.02226.02263.01971.01887.01800.01921.01900.01885.01821.01816.0
us-gaap:PremiumsEarnedNet █▇██▇▇▇▇▇▆▆▇▇▆▆▇▆▅▆▇▆▅▂▃▂▂▂▃▂▂▂▃▂▁▂▃▂▁▂▃▂▁▁▁▁▁▁▁▁▁8813.08221.08430.08765.08128.07794.07935.08327.07891.07137.07465.07908.07664.07027.07218.07807.07237.06772.07059.07688.07405.06597.04207.04719.04360.03927.04370.04754.04332.03970.04363.04610.04067.03573.03848.04665.03783.03381.03831.04490.03757.03309.03572.03422.03233.03277.03387.03393.03266.03194.0
us-gaap:RealizedInvestmentGainsLosses ▅█▇▄▅▁▄▄-33.0887.0571.0-141.030.0-958.0-55.0-155.0NANA-697.040.0-13.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RealizedInvestmentGainsLosses dei:LegalEntity cb:OtherAceLimitedSubsidiariesAndEliminationsNANANA48.0NANANA-219.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RealizedInvestmentGainsLosses us-gaap:ConsolidatedEntities srt:GuarantorSubsidiariesNA67.0NA-192.0NA113.0NA68.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RealizedInvestmentGainsLosses us-gaap:ConsolidatedEntities srt:ParentCompanyNA13.015.03.0NA-21.0-18.0-4.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RealizedInvestmentGainsLosses us-gaap:ConsolidationItems us-gaap:MaterialReconcilingItems█▆█▇▆▆▇▁3.0-1.03.01.0-1.0-2.00.0-14.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RealizedInvestmentGainsLosses us-gaap:InvestmentType cb:Equitysecuritiesandotherinvestments▁█212.0405.0NA31.041.0-24.0NA-1.035.014.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RealizedInvestmentGainsLosses us-gaap:InvestmentType us-gaap:OtherInvestments█▇▇▇▁▆▅▅▇▄▄▆▅▇62.038.039.031.0-107.05.0-2.0-4.030.0-44.0-28.05.0-11.029.0NANA0.00.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RealizedInvestmentGainsLosses us-gaap:StatementBusinessSegments us-gaap:Corporate▁█-36.0888.0NA-142.031.0-956.0NA-141.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:Revenues ███▇▇▆▇▇▆▆▅▇▆▆▆▇▆▅▆▆▆▅▂▂▃▂▂▃▂▂▃▃▂▂▂▃▁▂▂▂▂▁▂▁▁▁▂▁▁▁9664.09971.09848.09464.08985.07697.08738.09045.08527.07876.07626.08750.08510.07831.08015.08610.08108.07510.08168.08527.07897.06877.04679.04871.05048.04389.04737.05200.04815.04419.05074.05172.04705.04310.04687.05138.03926.04185.04479.04294.04253.03808.04409.03888.03760.03949.04272.03681.03547.03575.0
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:Assets ███▇▇▇▇▇▇▆▆▆▆▆▆▆▆▆▆▆▆▆▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁197174.0191977.0190774.0187786.0181474.0173127.0176943.0175148.0174516.0171347.0167771.0167684.0167534.0168781.0167022.0167578.0162988.0160967.0159786.0161810.0160203.0156644.0102366.097760.099840.098398.098248.097557.097447.095179.094510.094584.093688.093461.092545.093508.090701.089749.087505.088720.089254.086220.083355.0NANANA77980.0NANANA
us-gaap:Liabilities ██▇▇▇▇▇▆▇▆▆▆▆▆▆▆▆▆▆▆▆▆▂▂▂▂▂▂▂▁▁▂▂▁▁▂▁▁▁▁▁▁▁137112.0132901.0131333.0131373.0126714.0120930.0121612.0120576.0120714.0118992.0117459.0116750.0116563.0117494.0115850.0117107.0112639.0111743.0111511.0113438.0112977.0110747.073231.068633.070285.068696.068661.067540.067122.065810.065685.066366.066393.065519.065014.066545.064939.064318.062989.064970.065141.062844.060381.0NANANA58313.0NANANA
us-gaap:LiabilitiesAndStockholdersEquity ███▇▇▇▇▇▇▆▆▆▆▆▆▆▆▆▆▆▆▆▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁197174.0191977.0190774.0187786.0181474.0173127.0176943.0175148.0174516.0171347.0167771.0167684.0167534.0168781.0167022.0167578.0162988.0160967.0159786.0161810.0160203.0156644.0102366.097760.099840.098398.098248.097557.097447.095179.094510.094584.093688.093461.092545.093508.090701.089749.087505.088720.089254.086220.083355.0NANANA77980.0NANANA
us-gaap:StockholdersEquity ███▇▇▆▇▇▇▆▆▆▆▆▆▆▆▆▅▅▅▅▁▁▁60062.059076.059441.056413.054760.052197.055331.054572.053802.052355.050312.050934.050971.051287.051172.050471.050349.049224.048275.048372.047226.045897.029135.029127.029555.0NA29587.0NANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:CashAndCashEquivalentsAtCarryingValue ▇▇▇▇▆▆▆▆▅▅▅▄▃█▂▄▅▄▃▃▃▄▇▄▂▃▂▂▁▃▁▂▂▃▂▂▂▂▂▂▃▄▂▁▂▂▂1843.01684.01747.01707.01557.01512.01537.01478.01270.01271.01247.01053.01000.01988.0728.01088.01297.01063.0985.0870.01011.01091.01775.01038.0790.0948.0655.0806.0594.0847.0579.0768.0679.0855.0615.0690.0617.0715.0614.0766.0833.01115.0772.0487.0668.0726.0669.0NANANA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▇▆▆▇▆▅▅▅▄▄▄▃▂█▁▃▄▃▂1998.01841.01836.01873.01709.01658.01646.01589.01368.01393.01340.01157.01101.02113.0851.01193.01419.01160.01088.0NANANA1885.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:AmortizationOfIntangibleAssets ▇▇▇▇▇▇▇▇▇▇████▆▆▆▆▁▁▁▁▄▅▅▃▃▃73.072.073.072.072.073.076.076.077.076.086.083.085.085.066.065.065.064.03.04.05.07.035.051.055.030.030.027.0NANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PropertyPlantAndEquipmentNet NANA2000.0NANANA1900.0NANANA1700.0NANANA1300.0NANANA1200.0NANANA938.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentNet us-gaap:PropertyPlantAndEquipmentByType us-gaap:BuildingNANA260.0NANANA270.0NANANA277.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentNet us-gaap:PropertyPlantAndEquipmentByType us-gaap:SoftwareDevelopmentNANA1300.0NANANA1100.0NANANA970.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures NANA2813.0NANANA1332.01064.01050.0708.0678.0656.0675.0664.0662.0652.0662.0666.0666.0665.0658.0654.0653.0654.0638.0590.0504.0495.0470.0466.0470.0468.0452.0449.0454.0354.0339.0346.0380.0371.0353.0348.0360.0NANANA433.0NANANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures dei:LegalEntity,us-gaap:StatementGeographical cb:ABRReinsuranceCapitalHoldingsLtd.,country:BMNANA114.0NANANA100.0NANANA91.0NANANA93.0NANANA97.0NANANA94.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures dei:LegalEntity,us-gaap:StatementGeographical cb:ChubbArabiaCooperativeInsuranceCompany,country:SANANA23.0NANANA20.0NANANA18.0NANANA15.0NANANA13.0NANANA11.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures dei:LegalEntity,us-gaap:StatementGeographical cb:FreisenbruchMeyer,country:BMNANA10.0NANANA10.0NANANA9.0NANANA9.0NANANA8.0NANANA9.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures dei:LegalEntity,us-gaap:StatementGeographical cb:HuataiGroup,country:CNNANA2461.0NANANA1053.0NANANA452.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures dei:LegalEntity,us-gaap:StatementGeographical cb:HuataiLifeInsuranceCo.,country:CNNANA201.0NANANA147.0NANANA106.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures dei:LegalEntity,us-gaap:StatementGeographical cb:RussianReinsuranceCompany,country:RUNANA4.0NANANA2.0NANANA2.0NANANA2.0NANANA2.0NANANA2.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:Goodwill ██████████████████████▁15506.015412.015400.015254.015184.014971.015296.015230.015300.015328.015271.015332.015476.015686.015541.015707.015434.015387.015332.015481.015525.015404.04796.0NANANA4904.0NANANA4603.0NANANA4319.0NANANA4180.0NANANA4030.0NANANA3814.0NANANA
us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill NANA2965.0NANANA2900.0NANANA2900.0NANANA3000.0NANANA3000.0NANANA98.0NANANA103.0NANANA106.0NANANA102.0NANANANANANANANANANANANANANANA
us-gaap:IntangibleAssetsNetExcludingGoodwill ▆▆▆▆▆▆▆▆▆▆▆▆▆▆▇▇▇▇▇▇▇█▁5694.05749.05811.05849.05909.05902.06063.06148.06266.06091.06143.06139.06283.06437.06513.06558.06579.06674.06763.06991.07398.07955.0887.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:FiniteLivedIntangibleAssetsNet NANA2846.0NANANA3200.0NANANA3200.0NANANA3500.0NANANA3800.0NANANA789.0NANANA717.0NANANA695.0NANANA554.0NANANANANANANANANANANANANANANA
us-gaap:IntangibleAssetsNetIncludingGoodwill NANA21211.021103.021093.020873.021359.021378.021566.021419.021414.021471.021759.022123.022054.022265.022013.022061.022095.022472.022923.023359.05683.05713.05969.05516.05724.05425.05522.05382.05404.05465.05395.04909.04975.04990.04826.0NA4799.0NANANANANANANANANANANA
 us-gaap:IntangibleAssetsNetIncludingGoodwill dei:LegalEntity cb:OtherAceLimitedSubsidiariesAndEliminationsNANA21211.021103.021093.020873.021359.021378.021566.021419.021414.021471.021759.022123.022054.022265.022013.022061.022095.022472.022923.023359.05683.0NANANA5724.0NANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseRightOfUseAsset ▁▂▄▃▄▆█429.0448.0473.0470.0483.0509.0551.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:EquitySecuritiesFvNi ██▇▅▄▃▁▁▁▁▁4607.04405.04027.03088.02394.02068.0812.0722.0715.0821.0770.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:LongTermDebt ████▇▇▇▇▇▆▆▆▆▇▆▆▆▆▇▇▇▇▅▁▁▁▁▁▁▁▁▁▁▂▁▁▁▁▁▁▁▁▁14954.014879.014948.014830.013656.013510.013559.013285.013371.012071.012087.012149.012184.012786.011556.011559.011667.012300.012610.012621.012631.012636.09447.04157.04157.04157.03357.04057.04057.03808.03807.03807.03807.04307.03360.03360.03360.03360.03360.03360.03360.03358.03358.0NANANA3158.0NANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet ▃▂▅▄▃▂▄▄▃▂▁▁▁▂▃▆▆▅▅██581.0482.0892.0815.0696.0474.0804.0766.0697.0541.0304.0363.0326.0468.0699.01139.01122.0967.0988.01418.01409.0NA0.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:StockholdersEquity ███▇▇▆▇▇▇▆▆▆▆▆▆▆▆▆▅▅▅▅▁▁▁60062.059076.059441.056413.054760.052197.055331.054572.053802.052355.050312.050934.050971.051287.051172.050471.050349.049224.048275.048372.047226.045897.029135.029127.029555.0NA29587.0NANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest NANA59441.0NANANA55331.0NANANA50312.0NANANA51172.0NANANA48275.0NANA45897.029135.029127.029555.029702.029587.030017.030325.029369.028825.028218.027295.027942.027531.026963.025762.025431.024516.023750.024113.023376.022974.022845.021410.020636.019667.0NANANA
 us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest dei:LegalEntity cb:OtherAceLimitedSubsidiariesAndEliminationsNANA75441.0NANANA70250.0NANANA66036.0NANANA65278.0NANANA63303.0NANA61283.030710.0NANANA35915.0NANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:ConsolidatedEntities srt:GuarantorSubsidiariesNANA35938.0NANANA32679.0NANANA27704.0NANANA27796.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:ConsolidatedEntities srt:ParentCompanyNANA59441.0NANANA55331.0NANANA50312.0NANANA51172.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:ConsolidationItems srt:ConsolidationEliminationsNANA-111379.0NANANA-102929.0NANANA-93740.0NANANA-93074.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:CommonStockValue ██████████████████████▁▁▁▁▁▂▂▃▃▄▄▄▅▅▅▆▆▆▆▆▆11064.011064.011064.011064.011121.011121.011121.011121.011121.011121.011121.011121.011121.011121.011121.011121.011121.011121.011121.011121.011121.011121.07833.07833.07833.07833.08055.08278.08501.08724.08899.09073.09249.09423.09591.09759.09927.010095.010095.010095.010098.010075.010161.0NANANA10503.0NANANA
 us-gaap:AdditionalPaidInCapital us-gaap:ConsolidatedEntities srt:ParentCompanyNANA9815.0NANANA11203.0NANANA12557.0NANANA13978.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AdditionalPaidInCapitalCommonStock ▁▁▂▂▃▃▄▄▅▅▆▆▇▇██9046.09318.09815.010115.010416.010710.011203.011465.011757.012051.012557.012853.013150.013430.013978.014217.0NANA15335.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:RetainedEarningsAccumulatedDeficit ██▇▇▇▇▇▆▆▆▆▆▅▅▅▅▅▄▄▄▄▄▃▃▃▃▃▃▃▃▂▂▂▂▂▂▁▁▁▁▁▁▁43902.041637.039337.036919.035991.036331.036142.034969.033878.032728.031700.031491.030260.028965.027474.025941.026011.024706.023613.022003.020643.019917.019478.018795.018267.017325.016644.016089.015304.014525.013791.012793.011877.010986.010033.09268.08628.08300.07511.06761.06792.06185.05926.0NANANA2818.0NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▆▅█▇▆▁▅▅▄▃▁▁▂▃▅▆▅▄▄▆▆▅▃▄▅▆▆▆▇▆▆▆▆███▇▇▇▆▇▆▆1822.0958.02869.01856.01098.0-2093.0619.0521.0139.0-770.0-2448.0-2159.0-1520.0-502.0543.01069.0370.00.0-314.01197.01181.0367.0-735.0-192.0607.01152.01191.01608.02095.01526.01152.01374.01260.02650.02887.03014.02338.02209.01911.01839.01989.01782.01594.0NANANA823.0NANANA
us-gaap:TreasuryStockValue █▆▅▅▆▆▅▅▅▄▄▄▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁5772.03901.03644.03541.03866.03872.03754.03504.03093.02775.02618.02372.02040.01727.01944.01877.01675.01398.01480.01550.01577.01648.01922.01974.01999.01645.01448.01057.0630.0443.0255.0222.0219.0212.0159.0187.0206.0227.0327.0350.0250.0251.0330.0NANANA3.0NANANA
 us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital▆▅▆▅▄▅▇▅▅▄▇▅▅▅█▅▇▅▅▆█▅▃▄▄▅▃▄▄▄▁▆▅▃▃▃▂▃▃▃▃▃▃81.066.072.059.055.069.089.060.063.054.099.063.061.062.0108.067.091.065.063.080.0105.065.029.044.048.063.032.053.048.052.07.079.063.042.042.032.028.033.036.032.037.034.038.0NANA31.0NANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▇▃▅█▃▂▁▄▁▁▂3122.02105.02544.03544.01985.01712.01429.02205.01386.01322.01583.0NANANANANANANANANANA1020.01165.0808.0816.01075.01274.01126.0846.01250.01286.0928.0895.0913.0970.01642.0811.0572.0472.0935.01060.01003.0771.01084.0868.0823.0NANANANA
us-gaap:NetCashProvidedByUsedInInvestingActivities █▇█▁▆▇▅▇▆██-773.0-1252.0-792.0-4035.0-1684.0-1010.0-2344.0-1274.0-1614.0-673.0-808.0NANANANANANANANANANA-1615.0-4869.0-405.00.0-1020.0-816.0-229.0-956.0-503.0-1303.0-763.0-910.0-1466.0-757.0-1432.0-635.0-615.0-506.0-631.0-1268.0-631.0-1513.0-1201.0-801.0-666.0NANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity cb:OtherAceLimitedSubsidiariesAndEliminationsNANA-1308.0-3509.0-1673.0-1870.0-1546.0-1254.0-1607.0-633.0-804.0NANANANANANANANANANA2549.0NANANA-1236.0NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities us-gaap:ConsolidatedEntities srt:GuarantorSubsidiariesNANA444.0-525.0-10.0860.0-798.0-20.0-7.0-150.0-54.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities us-gaap:ConsolidatedEntities srt:ParentCompanyNANA0.0-1.0-1.0-1200.00.0-400.0-600.00.0-350.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities us-gaap:ConsolidationItems srt:ConsolidationEliminationsNANA72.00.00.01200.00.0400.0600.0110.0400.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁▄▂▇▅▄█▄▆▄▅-2210.0-812.0-1848.0664.0-253.0-645.0973.0-693.0199.0-630.0-567.0NANANANANANANANANANA-102.04472.0-118.0-992.0333.0-537.0-615.0-153.0-472.0-161.0-106.0-155.0813.0-279.0-148.0-262.0139.0-87.0-363.0-78.0-37.01014.0-91.0-98.0-93.0NANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity cb:OtherAceLimitedSubsidiariesAndEliminationsNANA-1769.0-1079.0-31.01256.0-1713.075.0-576.0-426.0-664.0NANANANANANANANANANA-3910.0NANANA-243.0NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidatedEntities srt:GuarantorSubsidiariesNANA-1079.0585.0120.0-1105.0-568.0202.0-1528.0382.0102.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidatedEntities srt:ParentCompanyNANA-899.0-767.0-124.01144.010.0303.0578.0-306.0331.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidationItems srt:ConsolidationEliminationsNANA1899.01925.0-218.0-1940.03244.0-1273.01725.0-280.0-336.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▅▄▄▅▄▄▄▅▄▄▅▄▁█▃▃▅▄157.05.0-37.0164.051.012.057.0221.0-25.053.0183.056.0-1012.01262.0-342.0-226.0259.072.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet █▄▁▆▄▃▁▄▄▄▂▆▄▃▂▄▄▂▁▄▅▂▁▄▃▄▂▄▄▃▁▃▄▄▁▄▃▄▄▂▃▃▄▄▂▃1151.0196.0-502.0740.0162.0-140.0-464.0153.068.0205.0-354.0579.0142.0-16.0-267.095.0228.0-238.0-560.096.0466.0-289.0-530.0194.0-54.077.0-386.0159.057.021.0-475.0-115.0284.094.0-471.0178.0-97.055.0126.0-234.0-83.0-159.0145.0160.0-331.0-146.0NANANANA
us-gaap:NetCashProvidedByUsedInOperatingActivities ▇▃▅█▃▂▁▄▁▁▂3122.02105.02544.03544.01985.01712.01429.02205.01386.01322.01583.0NANANANANANANANANANA1020.01165.0808.0816.01075.01274.01126.0846.01250.01286.0928.0895.0913.0970.01642.0811.0572.0472.0935.01060.01003.0771.01084.0868.0823.0NANANANA
us-gaap:NetIncomeLoss ███▅▁▂▅▅▅▄▃▅▅▅▆▂▅▅▆▅▄▃▄▃▄▄▃▄▄▄▄▄▄▄▄▃▃▄▄▂▃▃▄▄▄▄▄▃▃▃2265.02300.02418.01194.0-331.0252.01173.01091.01150.01040.0355.01231.01294.01082.01533.0-70.01305.01093.01610.01360.0726.0439.0683.0528.0942.0681.0555.0785.0779.0734.0998.0916.0891.0953.0765.0640.0328.0973.0750.0-31.0607.0259.01001.0675.0677.0755.0953.0494.0535.0567.0
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities █▇█▁▆▇▅▇▆██-773.0-1252.0-792.0-4035.0-1684.0-1010.0-2344.0-1274.0-1614.0-673.0-808.0NANANANANANANANANANA-1615.0-4869.0-405.00.0-1020.0-816.0-229.0-956.0-503.0-1303.0-763.0-910.0-1466.0-757.0-1432.0-635.0-615.0-506.0-631.0-1268.0-631.0-1513.0-1201.0-801.0-666.0NANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity cb:OtherAceLimitedSubsidiariesAndEliminationsNANA-1308.0-3509.0-1673.0-1870.0-1546.0-1254.0-1607.0-633.0-804.0NANANANANANANANANANA2549.0NANANA-1236.0NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities us-gaap:ConsolidatedEntities srt:GuarantorSubsidiariesNANA444.0-525.0-10.0860.0-798.0-20.0-7.0-150.0-54.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities us-gaap:ConsolidatedEntities srt:ParentCompanyNANA0.0-1.0-1.0-1200.00.0-400.0-600.00.0-350.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities us-gaap:ConsolidationItems srt:ConsolidationEliminationsNANA72.00.00.01200.00.0400.0600.0110.0400.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁▄▂▇▅▄█▄▆▄▅-2210.0-812.0-1848.0664.0-253.0-645.0973.0-693.0199.0-630.0-567.0NANANANANANANANANANA-102.04472.0-118.0-992.0333.0-537.0-615.0-153.0-472.0-161.0-106.0-155.0813.0-279.0-148.0-262.0139.0-87.0-363.0-78.0-37.01014.0-91.0-98.0-93.0NANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity cb:OtherAceLimitedSubsidiariesAndEliminationsNANA-1769.0-1079.0-31.01256.0-1713.075.0-576.0-426.0-664.0NANANANANANANANANANA-3910.0NANANA-243.0NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidatedEntities srt:GuarantorSubsidiariesNANA-1079.0585.0120.0-1105.0-568.0202.0-1528.0382.0102.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidatedEntities srt:ParentCompanyNANA-899.0-767.0-124.01144.010.0303.0578.0-306.0331.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidationItems srt:ConsolidationEliminationsNANA1899.01925.0-218.0-1940.03244.0-1273.01725.0-280.0-336.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ProceedsFromIssuanceOfLongTermDebt NANA0.0988.0NANA1542.0-3.01289.00.00.00.0-4.02175.00.00.00.00.0NA0.00.00.05290.00.00.0800.00.00.0699.00.00.00.00.0947.0NA0.00.00.0NANANANANANANANANANANANA
 us-gaap:ProceedsFromIssuanceOfLongTermDebt us-gaap:ConsolidatedEntities srt:GuarantorSubsidiariesNANA0.0NANANA1542.0-3.0NANA0.00.0-4.02175.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PaymentsOfDividendsCommonStock ████████████▇▇▇█▇▇▇▇▇▅▅▅▅▅▅▅▅▅▄▄▄▁▇▄▄▄▃▃▃▃▃▃▃▃351.0352.0353.0357.0339.0339.0340.0343.0335.0336.0336.0340.0331.0330.0330.0332.0322.0324.0322.0321.0312.0218.0218.0217.0213.0214.0216.0218.0214.0214.0174.0174.0167.02.0331.0166.0159.0159.0117.0119.0111.0112.0112.0113.0105.0105.0NANANANA
us-gaap:PaymentsForRepurchaseOfCommonStock █▃▂▁▁▂▂▃▂▂▂▂▂▁▁▂▂▁1921.0519.0190.00.010.0323.0327.0462.0374.0367.0312.0385.0318.029.094.0232.0347.0128.0NA0.00.00.00.08.0403.0347.0422.0450.0222.0335.054.021.058.0154.00.00.00.011.027.0100.00.068.0NANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1106411064110641106411121111211112111121111211112111121111211112111121111211112111121111211112111121111211112178337833783378338055827885018724889990739249942395919759992710095100951009510098100751016110503
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.65.85.85.96.16.46.36.36.46.56.66.66.66.66.76.66.86.97.06.96.97.17.78.07.88.08.28.58.79.29.49.69.910.110.410.410.911.211.511.411.311.712.213.5

us-gaap:CommonStockValue us-gaap:ConsolidatedEntities

srt:ParentCompany


Common
Period End2020-12-312019-12-312018-12-312017-12-31
Value11064111211112111121
Percentage of CommonStockValue100.0100.0100.0100.0
Percentage of Assets5.86.36.66.7
Percentage of Assets srt:ParentCompany18.520.022.021.6

Common Stock Par Or Stated Value Per Share

us-gaap:CommonStockParOrStatedValuePerShare

us-gaap:CommonStockParOrStatedValuePerShare


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value24.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.1524.7725.426.0126.5927.0427.4927.9528.4328.8929.3429.7930.2730.2730.2730.2730.2730.57
Percentage of CommonStockParOrStatedValuePerShare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesIssued


Common
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value477479479479479479479479479479479479479479479479479479479342342342342342342342342342342342342342342342342342342342341341337335329
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value447453453451454458460461466468469466471472471471450327328331337341342343344343342342341338341339341341339
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value445450451451451454457458462465465466467468468467446324325328334337338340341340340339338338338337340339338
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value5.095.15.352.64-0.730.562.592.42.522.270.772.662.782.323.29-0.152.792.333.442.91.550.982.11.632.892.081.682.352.32.162.932.682.612.82.241.880.962.872.22-0.091.790.772.941.981.992.232.821.461.581.69
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value5.065.075.332.63-0.730.552.572.382.52.250.762.642.762.33.27-0.152.772.313.412.881.540.972.081.622.862.051.662.322.282.142.92.662.592.772.221.860.962.842.2-0.091.770.762.921.971.982.222.811.461.581.69
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Benefits Losses And Expenses

us-gaap:BenefitsLossesAndExpenses

us-gaap:BenefitsLossesAndExpenses


Benefits
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value7082733370968128937872307396772471696648711273366998661468648765660362896299689070166314392942113963358839504239390335923988410136993235405743513450310236074160352434523275305329413070
Percentage of BenefitsLossesAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues73.373.572.185.9104.493.984.685.484.184.493.383.882.284.585.6101.881.483.777.180.888.891.884.086.578.581.783.481.581.181.378.679.378.675.186.684.787.974.180.596.982.990.774.378.578.277.7

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value3129389343119522860-2460.01271147320592718-80.059227745310076291675140799137615401541140-271.0397
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues32.43.934.820.631.8-32.014.516.324.134.5-1.06.83.35.812.67.320.718.71.216.119.522.43.0-5.67.9

us-gaap:ComprehensiveIncomeNetOfTax dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Comprehensive
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-30
Value21803078-2418.015172181278864035261472417561538143916811721-262.0403
Percentage of ComprehensiveIncomeNetOfTax111.7107.698.3103.0105.9102.6108.1127.1135.5115.1104.8109.3104.6109.2111.796.7101.5
Percentage of Revenues23.034.3-31.416.825.635.47.34.17.88.421.720.516.921.325.0-5.48.0
Percentage of Revenues cb:OtherAceLimitedSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ComprehensiveIncomeNetOfTax us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Comprehensive
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value1.08121872-1200.011381397194147-462.0216748
Percentage of ComprehensiveIncomeNetOfTax0.341.665.548.877.367.871.47.9-166.847.7118.9
Percentage of Revenues0.08.620.8-15.612.616.424.60.5-5.42.88.7
Percentage of Revenues srt:GuarantorSubsidiaries0.00.00.00.00.00.00.00.00.00.00.0

srt:ParentCompany


Comprehensive
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value2819522860-2460.0147320592718592277453629
Percentage of ComprehensiveIncomeNetOfTax7.2100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.320.631.8-32.016.324.134.56.83.35.87.3
Percentage of Revenues srt:ParentCompany0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ComprehensiveIncomeNetOfTax us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Comprehensive
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-2992.0-4950.03618-2655.0-3578.0-4729.0-687.0110-830.0-1472.0
Percentage of ComprehensiveIncomeNetOfTax-153.3-173.1-147.1-180.2-173.8-174.0-116.039.7-183.2-234.0
Percentage of Revenues-31.6-55.147.0-29.4-42.0-60.0-7.91.3-10.6-17.1
Percentage of Revenues srt:ConsolidationEliminations0.00.00.00.00.00.00.00.00.00.0

Deferred Policy Acquisition Cost Amortization Expense

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1698166516941645159316151542160315441464148015041464146414471488144913971417151415601413736771727707764825758728702678665614636609619582622666604555640607536554
Percentage of DeferredPolicyAcquisitionCostAmortizationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues17.616.717.217.417.721.017.617.718.118.619.417.217.218.718.117.317.918.617.317.819.820.515.715.814.416.116.115.915.716.513.813.114.114.213.611.915.813.913.915.514.214.614.515.614.314.0

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense us-gaap:StatementBusinessSegments

cb:SegmentGlobalReinsurance


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4745474042454242424342404040
Percentage of DeferredPolicyAcquisitionCostAmortizationExpense2.82.72.82.42.62.82.72.62.72.92.82.72.72.7
Percentage of Revenues0.50.50.50.40.50.60.50.50.50.50.60.50.50.5
Percentage of Revenues cb:SegmentGlobalReinsurance0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceNorthAmericanAgriculture


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value271227562911-6.056277.05.04926-1.06.04927-1.06.048254.08.04223-4.0
Percentage of DeferredPolicyAcquisitionCostAmortizationExpense1.60.71.63.41.80.7-0.43.51.70.50.33.31.8-0.10.43.31.9-0.10.43.21.60.31.15.43.2-0.6
Percentage of Revenues0.30.10.30.60.30.1-0.10.60.30.10.10.60.3-0.00.10.60.3-0.00.10.60.30.10.20.90.5-0.1
Percentage of Revenues cb:SegmentInsuranceNorthAmericanAgriculture0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceNorthAmericanCommercialPCMemberMember


Deferred
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-31
Value489514489471492459459459458448472469464487522545482142131130
Percentage of DeferredPolicyAcquisitionCostAmortizationExpense28.830.929.729.630.528.629.731.430.530.632.231.532.034.934.534.934.118.418.018.4
Percentage of Revenues5.15.25.25.26.45.15.45.85.25.36.05.45.76.56.16.97.02.92.63.0
Percentage of Revenues cb:SegmentInsuranceNorthAmericanCommercialPCMemberMember0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceNorthAmericanPersonalPCMember


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2452472502482312452402402372312382362282372262262302172192292692492613-1.031
Percentage of DeferredPolicyAcquisitionCostAmortizationExpense14.414.814.815.114.515.215.615.015.315.816.115.715.616.215.615.215.915.515.515.117.217.63.51.7-0.14.4
Percentage of Revenues2.52.52.52.62.63.22.72.72.82.93.12.72.73.02.82.62.82.92.72.73.43.60.60.3-0.00.7
Percentage of Revenues cb:SegmentInsuranceNorthAmericanPersonalPCMember0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceOverseasGeneral


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value699668665637624642646630629596592582584588568569555529550546537503391405396389
Percentage of DeferredPolicyAcquisitionCostAmortizationExpense41.240.139.338.739.239.841.939.340.740.740.038.739.940.239.338.238.337.938.836.134.435.653.152.554.555.0
Percentage of Revenues7.26.76.86.76.98.37.47.07.47.67.86.76.97.57.16.66.87.06.76.46.87.38.48.37.88.9
Percentage of Revenues cb:SegmentInsuranceOverseasGeneral0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentLife


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value191179215175196180166176150128152139138128154132130114123127137122134117118107
Percentage of DeferredPolicyAcquisitionCostAmortizationExpense11.210.812.710.612.311.110.811.09.78.710.39.29.48.710.68.99.08.28.78.48.88.618.215.216.215.1
Percentage of Revenues2.01.82.21.82.22.31.91.91.81.62.01.61.61.61.91.51.61.51.51.51.71.82.92.42.32.4
Percentage of Revenues cb:SegmentLife0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense

us-gaap:GeneralAndAdministrativeExpense


General
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value775744778733727741810752758710728719747692737714706676708772829772570568578554590554566535570563564514553519514510526517515494502433463460
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues8.07.57.97.78.19.69.38.38.99.09.58.28.88.89.28.38.79.08.79.110.511.212.211.711.512.612.510.711.812.111.210.912.011.911.810.113.112.211.712.012.113.011.411.112.311.6

us-gaap:GeneralAndAdministrativeExpense us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


General
Period End2021-03-312020-03-31
Value5238
Percentage of GeneralAndAdministrativeExpense7.05.1
Percentage of Revenues0.50.5
Percentage of Revenues srt:GuarantorSubsidiaries0.00.0

srt:ParentCompany


General
Period End2021-03-312020-03-31
Value-22.0-24.0
Percentage of GeneralAndAdministrativeExpense-3.0-3.2
Percentage of Revenues-0.2-0.3
Percentage of Revenues srt:ParentCompany0.00.0

us-gaap:GeneralAndAdministrativeExpense us-gaap:StatementBusinessSegments

cb:SegmentGlobalReinsurance


General
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value10.08.09.09.09.010.09.09.07.010.01210.09.010.0
Percentage of GeneralAndAdministrativeExpense1.31.11.21.21.21.31.11.20.91.41.61.41.21.4
Percentage of Revenues0.10.10.10.10.10.10.10.10.10.10.20.10.10.1
Percentage of Revenues cb:SegmentGlobalReinsurance0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceNorthAmericanAgriculture


General
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value3.03.0-3.05.03.04.0-3.04.04.01.0-9.02.01.0-3.0-4.0-1.02.0-5.0-5.01.02.0-4.0-2.00.04.0-1.0
Percentage of GeneralAndAdministrativeExpense0.40.4-0.40.70.40.5-0.40.50.50.1-1.20.30.1-0.4-0.5-0.10.3-0.7-0.70.10.2-0.5-0.40.00.7-0.2
Percentage of Revenues0.00.0-0.00.10.00.1-0.00.00.00.0-0.10.00.0-0.0-0.0-0.00.0-0.1-0.10.00.0-0.1-0.00.00.1-0.0
Percentage of Revenues cb:SegmentInsuranceNorthAmericanAgriculture0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceNorthAmericanCommercialPCMemberMember


General
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-31
Value245254243249259256259240251253231256241231275299266154154151
Percentage of GeneralAndAdministrativeExpense31.634.133.234.335.034.034.233.834.933.933.435.934.134.235.636.134.527.126.627.3
Percentage of Revenues2.52.52.62.83.42.83.03.02.93.02.93.03.03.13.23.83.93.23.13.4
Percentage of Revenues cb:SegmentInsuranceNorthAmericanCommercialPCMemberMember0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceNorthAmericanPersonalPCMember


General
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value6760716566687572716867696865726166658889988834363419
Percentage of GeneralAndAdministrativeExpense8.68.19.18.99.19.29.39.69.49.69.29.69.19.49.88.59.39.612.411.511.811.46.06.35.93.4
Percentage of Revenues0.70.60.70.70.70.90.90.80.80.90.90.80.80.80.90.70.80.91.11.01.21.30.70.70.70.4
Percentage of Revenues cb:SegmentInsuranceNorthAmericanPersonalPCMember0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceOverseasGeneral


General
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value279266275260241258262257265249257252266239248246243245256261277263241246254256
Percentage of GeneralAndAdministrativeExpense36.035.835.335.533.134.832.334.235.035.135.335.035.634.533.634.534.436.236.233.833.434.142.343.343.946.2
Percentage of Revenues2.92.72.82.72.73.43.02.83.13.23.42.93.13.13.12.93.03.33.13.13.53.85.25.15.05.8
Percentage of Revenues cb:SegmentInsuranceOverseasGeneral0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentLife


General
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value8382828082768680787975778078777777728177777270747473
Percentage of GeneralAndAdministrativeExpense10.711.010.510.911.310.310.610.610.311.110.310.710.711.310.410.810.910.711.410.09.39.312.313.012.813.2
Percentage of Revenues0.90.80.80.80.91.01.00.90.91.01.00.90.91.01.00.90.91.01.00.91.01.01.51.51.51.7
Percentage of Revenues cb:SegmentLife0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Corporate


General
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value8871717766747463587072646558
Percentage of GeneralAndAdministrativeExpense11.49.59.710.68.99.89.88.98.19.410.49.09.28.6
Percentage of Revenues0.90.70.80.90.90.80.90.80.70.80.90.70.80.8
Percentage of Revenues us-gaap:Corporate0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2582263827521336-393.046713421321135812285141414151212171151-155.015051221186916378815637506601085801
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues26.726.527.914.1-4.46.115.414.615.915.66.716.217.815.514.4-1.818.616.322.919.211.28.216.013.521.518.3

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value317338334142-62.0215169230208188159183218135-382.0-85.0200128259277155124671321431202321761339388155115122-135.014714811012216512297133160142124
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues3.33.43.41.5-0.72.81.92.52.42.42.12.12.61.7-4.8-1.02.51.73.23.22.01.81.42.72.82.74.93.42.82.11.73.02.42.8-2.92.93.82.62.73.82.92.53.04.13.83.1

us-gaap:IncomeTaxExpenseBenefit dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Income
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value202-6.0208260248226202249189-2.0283234407187268328159165143
Percentage of IncomeTaxExpenseBenefit142.39.796.7113.0119.2120.2110.4114.2140.02.4141.5182.8146.9120.6216.1489.6120.5115.4119.2
Percentage of Revenues2.1-0.12.72.92.92.92.32.92.4-0.03.53.14.82.43.97.03.33.33.3
Percentage of Revenues cb:OtherAceLimitedSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeTaxExpenseBenefit us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Income
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value22-66.0-66.07.0-33.0-45.0-42.0-24.0-36.0-59.0-89.0
Percentage of IncomeTaxExpenseBenefit6.5-46.5106.53.3-14.3-21.6-22.3-13.1-16.5-43.7104.7
Percentage of Revenues0.2-0.7-0.70.1-0.4-0.5-0.5-0.3-0.4-0.8-1.0
Percentage of Revenues srt:GuarantorSubsidiaries0.00.00.00.00.00.00.00.00.00.00.0

srt:ParentCompany


Income
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-11.08.06.010.00.02.03.05.04.04.05.05.05.04.06.0
Percentage of IncomeTaxExpenseBenefit-3.32.44.2-16.10.01.21.32.42.12.52.72.33.7-1.0-7.1
Percentage of Revenues-0.10.10.10.10.00.00.00.10.10.10.10.10.10.00.1
Percentage of Revenues srt:ParentCompany0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeTaxExpenseBenefit us-gaap:StatementBusinessSegments

us-gaap:Corporate


Income
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value317338142-62.0215230208188183218135-85.0200128
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues3.33.41.5-0.72.82.52.42.42.12.61.7-1.02.51.7
Percentage of Revenues us-gaap:Corporate0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3952362342263351071792115081419090130938414245654302101153106134721679699102886068624543115641877215441219461384018175
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues4.12.42.42.43.71.42.02.36.00.22.51.01.51.21.01.65.60.73.71.21.91.52.91.53.32.22.12.01.81.41.31.21.01.02.51.24.81.73.41.05.11.23.11.04.81.9

Interest Income Expense Net

us-gaap:InterestIncomeExpenseNet

us-gaap:InterestIncomeExpenseNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-122.0-122.0-126.0-130.0-128.0-132.0-134.0-138.0-140.0-140.0-153.0-164.0-167.0-157.0-156.0-150.0-147.0-154.0-154.0-152.0-153.0-146.0-93.0-68.0-71.0-68.0-67.0-70.0-72.0-71.0-70.0-72.0-73.0-60.0-63.0-63.06262-63.0-62.06263
Percentage of InterestIncomeExpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-1.3-1.2-1.3-1.4-1.4-1.7-1.5-1.5-1.6-1.8-2.0-1.9-2.0-2.0-1.9-1.7-1.8-2.1-1.9-1.8-1.9-2.1-2.0-1.4-1.4-1.5-1.4-1.3-1.5-1.6-1.4-1.4-1.6-1.4-1.3-1.21.61.5-1.4-1.41.51.7

us-gaap:InterestIncomeExpenseNet dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Interest
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-13.0-14.0-18.0-26.0-22.0-21.0-36.0-39.0-28.0-26.0-19.0-17.0-12.0-13.0-11.0-6.0-8.0-9.0-7.0
Percentage of InterestIncomeExpenseNet10.010.913.618.815.715.022.023.417.817.312.911.07.98.57.56.511.812.710.3
Percentage of Revenues-0.1-0.2-0.2-0.3-0.3-0.3-0.4-0.5-0.4-0.3-0.2-0.2-0.1-0.2-0.2-0.1-0.2-0.2-0.2
Percentage of Revenues cb:OtherAceLimitedSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:InterestIncomeExpenseNet us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Interest
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value145-151.0-149.0-148.0-171.0-180.0-185.0-203.0-204.0-209.0-208.0
Percentage of InterestIncomeExpenseNet-118.9116.2116.4112.1123.9128.6132.1123.8122.2133.1138.7
Percentage of Revenues1.5-1.6-1.7-1.9-1.9-2.1-2.3-2.3-2.4-2.7-2.4
Percentage of Revenues srt:GuarantorSubsidiaries0.00.00.00.00.00.00.00.00.00.00.0

srt:ParentCompany


Interest
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-34.03334353456596266687576808084
Percentage of InterestIncomeExpenseNet27.9-26.2-26.2-27.3-25.8-41.8-42.8-44.3-47.1-44.4-45.7-45.5-51.0-51.3-56.0
Percentage of Revenues-0.30.30.40.40.40.60.70.70.80.90.90.91.01.01.0
Percentage of Revenues srt:ParentCompany0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:InterestIncomeExpenseNet us-gaap:StatementBusinessSegments

us-gaap:Corporate


Interest
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-122.0-122.0-130.0-128.0-132.0-138.0-140.0-140.0-164.0-167.0-157.0-150.0-147.0-154.0
Percentage of InterestIncomeExpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-1.3-1.2-1.4-1.4-1.7-1.5-1.6-1.8-1.9-2.0-2.0-1.7-1.8-2.1
Percentage of Revenues us-gaap:Corporate0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1819020137195911854120185218712508224077252752527124871716179487852835184528631843782378339813174297229
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues1.90.92.00.42.21.22.10.52.41.12.90.82.91.03.00.93.11.03.10.83.11.01.51.31.61.11.61.01.71.21.71.01.80.71.80.72.10.91.90.91.90.81.70.71.90.7

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value2265230024181194-331.025211731091115010403551231129410821533-70.01305109316101360726439683528942681555785779734998916891953765640328973750-31.06072591001675677755953494535567
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues23.423.124.612.6-3.73.313.412.113.513.24.714.115.213.819.1-0.816.114.619.715.99.26.414.610.818.715.511.715.116.216.619.717.718.922.116.312.58.423.216.7-0.714.36.822.717.418.019.122.313.415.115.9

us-gaap:NetIncomeLoss dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Net
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1415-127.026411181262114012581358122323138712241423867619505538948693
Percentage of NetIncomeLoss118.538.4104.8102.5109.7109.6102.2104.9113.0-32.9106.3112.0104.6119.4141.073.9101.9100.6101.8
Percentage of Revenues15.0-1.43.412.414.814.514.416.015.60.317.116.316.711.09.010.811.018.815.8
Percentage of Revenues cb:OtherAceLimitedSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Net
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value2.0275-510.058575960460962833768462
Percentage of NetIncomeLoss0.123.0154.1232.169.652.558.651.026.063.2-88.6
Percentage of Revenues0.02.9-5.77.68.47.17.77.24.08.70.7
Percentage of Revenues srt:GuarantorSubsidiaries0.00.00.00.00.00.00.00.00.00.00.0

srt:ParentCompany


Net
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value2824181194-331.025211731091115010403551231129410821533-70.0
Percentage of NetIncomeLoss1.2100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.324.612.6-3.73.313.412.113.513.24.714.115.213.819.1-0.8
Percentage of Revenues srt:ParentCompany0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-3607.0-1690.0637-849.0-1837.0-1877.0-1866.0-1749.0-843.0-1886.0-1695.0-1907.0-2333.0-85.0
Percentage of NetIncomeLoss-149.2-141.5-192.4-336.9-156.6-172.0-162.3-168.2-237.5-153.2-131.0-176.2-152.2121.4
Percentage of Revenues-36.6-17.97.1-11.0-21.0-20.8-21.9-22.2-11.1-21.6-19.9-24.4-29.1-1.0
Percentage of Revenues srt:ConsolidationEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementBusinessSegments

us-gaap:Corporate


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-9.0697-196.0-571.0-1479.0-685.0-555.0-605.0-384.0-520.0-475.0-305.0-413.0-545.0
Percentage of NetIncomeLoss-0.430.3-16.4172.5-586.9-62.8-48.3-58.2-31.2-40.2-43.9435.7-31.6-49.9
Percentage of Revenues-0.17.0-2.1-6.4-19.2-7.6-6.5-7.7-4.4-6.1-6.1-3.5-5.1-7.3
Percentage of Revenues us-gaap:Corporate0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2265230024181194-331.025211731091115010403551231129410821533-70.01305109316101360726439683528942681555785779734998916891953765640328973750-31.06072591001675677755
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues23.423.124.612.6-3.73.313.412.113.513.24.714.115.213.819.1-0.816.114.619.715.99.26.414.610.818.715.511.715.116.216.619.717.718.922.116.312.58.423.216.7-0.714.36.822.717.418.019.1
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Investment Income

us-gaap:NetInvestmentIncome

us-gaap:NetInvestmentIncome


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value884863847840827861858873859836848823828806797813770745744739708674532549562551
Percentage of NetInvestmentIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues9.18.78.68.99.211.29.89.710.110.611.19.49.710.39.99.49.59.99.18.79.09.811.411.311.112.6

us-gaap:NetInvestmentIncome dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Net
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-30
Value839826859875864839818822800809764742736704669547562
Percentage of NetInvestmentIncome99.999.999.8100.2100.6100.499.499.399.399.599.299.699.699.499.399.6100.0
Percentage of Revenues8.99.211.29.710.110.79.39.710.29.49.49.98.68.99.711.211.1
Percentage of Revenues cb:OtherAceLimitedSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetInvestmentIncome us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Net
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value1.01.01.04.0-3.0-6.0-4.03.05.04.03.0
Percentage of NetInvestmentIncome0.10.10.10.5-0.3-0.7-0.50.40.60.50.4
Percentage of Revenues0.00.00.00.1-0.0-0.1-0.10.00.10.10.0
Percentage of Revenues srt:GuarantorSubsidiaries0.00.00.00.00.00.00.00.00.00.00.0

srt:ParentCompany


Net
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value1.01.00.00.0-2.0-2.01.01.01.01.02.01.02.01.01.0
Percentage of NetInvestmentIncome0.10.10.00.0-0.2-0.20.10.10.10.10.20.10.20.10.1
Percentage of Revenues0.00.00.00.0-0.0-0.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues srt:ParentCompany0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetInvestmentIncome us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-39.0-41.0-51.0-32.0-8.0-24.0-24.0-21.0
Percentage of NetInvestmentIncome-4.4-4.8-6.0-3.8-1.0-2.8-2.8-2.4
Percentage of Revenues-0.4-0.4-0.5-0.3-0.1-0.3-0.3-0.2
Percentage of Revenues us-gaap:MaterialReconcilingItems0.00.00.00.00.00.00.00.0

us-gaap:NetInvestmentIncome us-gaap:StatementBusinessSegments

cb:SegmentGlobalReinsurance


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value8170938551545455555665636564
Percentage of NetInvestmentIncome9.28.111.010.16.26.36.36.36.46.77.77.77.97.9
Percentage of Revenues0.80.70.90.90.60.70.60.60.60.70.90.70.80.8
Percentage of Revenues cb:SegmentGlobalReinsurance0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceNorthAmericanAgriculture


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value8.07.07.07.07.09.08.08.04.010.08.07.06.07.07.06.06.06.05.05.05.05.06.05.06.0
Percentage of NetInvestmentIncome0.90.80.80.80.81.00.90.90.51.20.90.90.70.90.90.70.80.80.70.70.70.71.10.91.1
Percentage of Revenues0.10.10.10.10.10.10.10.10.00.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of Revenues cb:SegmentInsuranceNorthAmericanAgriculture0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceNorthAmericanCommercialPCMemberMember


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-30
Value535540510507516532521510503510503497490478477468426260262
Percentage of NetInvestmentIncome60.562.660.761.359.960.960.761.061.161.662.461.163.664.264.566.163.247.446.6
Percentage of Revenues5.55.45.45.66.75.96.16.55.76.06.45.86.06.45.65.96.25.35.2
Percentage of Revenues cb:SegmentInsuranceNorthAmericanCommercialPCMemberMember0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceNorthAmericanPersonalPCMember


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value646565646566646664645959595958575655525355476.07.07.0
Percentage of NetInvestmentIncome7.27.57.77.67.97.77.57.67.57.77.07.27.17.37.37.07.37.47.07.27.87.01.11.31.2
Percentage of Revenues0.70.70.70.70.70.90.70.70.80.80.80.70.70.80.70.70.70.70.60.60.70.70.10.10.1
Percentage of Revenues cb:SegmentInsuranceNorthAmericanPersonalPCMember0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceOverseasGeneral


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value149141138130124145145148151144158155155151150164148148155152147146125132139
Percentage of NetInvestmentIncome16.916.316.315.515.016.816.917.017.617.218.618.818.718.718.820.219.219.920.820.620.821.723.524.024.7
Percentage of Revenues1.51.41.41.41.41.91.71.61.81.82.11.81.81.91.91.91.82.01.91.81.92.12.72.72.8
Percentage of Revenues cb:SegmentInsuranceOverseasGeneral0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentLife


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value1019810095959595929789888585838378777576716967676666
Percentage of NetInvestmentIncome11.411.411.811.311.511.011.110.511.310.610.410.310.310.310.49.610.010.110.29.69.79.912.612.011.7
Percentage of Revenues1.01.01.01.01.11.21.11.01.11.11.21.01.01.11.00.90.91.00.90.80.91.01.41.41.3
Percentage of Revenues cb:SegmentLife0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Corporate


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-15.0-17.0-19.0-22.0-24.0-28.0-33.0-37.0-49.0-52.0-61.0-69.0-72.0-79.0
Percentage of NetInvestmentIncome-1.7-2.0-2.3-2.7-2.8-3.2-3.8-4.4-6.0-6.3-7.6-8.5-9.4-10.6
Percentage of Revenues-0.2-0.2-0.2-0.2-0.3-0.3-0.4-0.5-0.6-0.6-0.8-0.8-0.9-1.1
Percentage of Revenues us-gaap:Corporate0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:AccumulatedTranslationAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value29024443233451-825.0177-185.0-95.0140-113.0-462.0-570.0378-411.065898131-375.0-131.0105277-133.0-547.0132-410.0-520.0-202.0119-41.0-66.0114-168.0-156.0-37.0141-79.056-123.0-105.0
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues3.00.24.52.55.0-10.72.0-2.0-1.11.8-1.5-5.3-6.74.8-5.17.61.21.7-4.6-1.51.34.0-2.8-11.22.6-9.3-11.0-3.92.5-0.9-1.32.2-3.6-3.6-0.82.7-2.01.3-2.7-2.4
Percentage of Revenues us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value864-1911.010137583191-2712.0983829091678-435.0-639.0-1017.0-629.0-526.0699370314-1511.0168141102-543.0-799.0-545.0-39.0-417.0-487.0569374-222.0114-1390.0-237.0-127.067612929872-150.0207
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues8.9-19.210.38.035.5-35.21.14.210.721.3-5.7-7.3-12.0-8.0-6.68.14.64.2-18.50.210.316.0-11.6-16.4-10.8-0.9-8.8-9.411.88.5-4.42.2-29.5-5.5-2.713.23.37.11.6-3.54.9

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense


Other
Period End2021-06-302020-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value777-58.0-28.0-10.0-12.0-17.05.0211925177.05.0-37.010.02017-34.03.09.0-87.0-9.014-10.025-3.04.0
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues8.0-0.6-0.4-0.2-0.2-0.30.10.40.40.50.40.10.1-0.80.20.40.3-0.90.10.2-2.0-0.20.4-0.20.6-0.10.1

Policyholder Benefits And Claims Incurred Net

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet


Policyholder
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value50065053481358356577448548655052471540984610486844874102427262474146378938554269425436742302264324172122241626842388216125172655225019262683304721191804228627452226226319711887180019211900188518211816
Percentage of PolicyholderBenefitsAndClaimsIncurredNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues51.850.748.961.773.258.355.755.955.352.060.555.652.752.453.372.651.150.547.250.153.953.449.254.347.948.351.051.649.648.949.651.347.844.757.259.354.043.151.063.952.359.444.748.547.948.644.551.251.350.8

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Policyholder
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value5835657744855052471540984868448741026247414637894269425436742302264324172122
Percentage of PolicyholderBenefitsAndClaimsIncurredNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues61.773.258.355.955.352.055.652.752.472.651.150.550.153.953.449.254.347.948.3
Percentage of Revenues cb:OtherAceLimitedSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems


Policyholder
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value3.0-1.03.01.0-1.0-2.00.0-14.0
Percentage of PolicyholderBenefitsAndClaimsIncurredNet0.1-0.00.10.0-0.0-0.00.0-0.3
Percentage of Revenues0.0-0.00.00.0-0.0-0.00.0-0.2
Percentage of Revenues us-gaap:MaterialReconcilingItems0.00.00.00.00.00.00.00.0

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet us-gaap:StatementBusinessSegments

cb:SegmentGlobalReinsurance


Policyholder
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1101201211547387107799076243868367
Percentage of PolicyholderBenefitsAndClaimsIncurredNet2.22.42.52.61.11.92.21.61.91.95.31.81.81.6
Percentage of Revenues1.11.21.21.60.81.11.20.91.11.03.21.01.00.9
Percentage of Revenues cb:SegmentGlobalReinsurance0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceNorthAmericanAgriculture


Policyholder
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value3318532184531263453866316-27.0156719289-53.060759290-73.0-44.0683284-30.017562027122
Percentage of PolicyholderBenefitsAndClaimsIncurredNet6.61.76.714.54.71.49.317.16.7-0.73.414.86.4-1.31.412.17.0-1.9-1.116.06.7-0.87.623.511.21.0
Percentage of Revenues3.40.93.38.93.50.85.29.63.7-0.32.08.23.4-0.70.78.83.6-1.0-0.58.03.6-0.43.712.75.40.5
Percentage of Revenues cb:SegmentInsuranceNorthAmericanAgriculture0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceNorthAmericanCommercialPCMemberMember


Policyholder
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-31
Value24262560244434982181205122141973188120841908258019361860186319711747913916915
Percentage of PolicyholderBenefitsAndClaimsIncurredNet48.550.741.953.248.640.647.048.138.646.446.541.346.749.143.646.347.634.537.943.1
Percentage of Revenues25.125.725.838.928.322.726.025.121.524.524.430.023.924.821.825.025.418.718.120.8
Percentage of Revenues cb:SegmentInsuranceNorthAmericanCommercialPCMemberMember0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceNorthAmericanPersonalPCMember


Policyholder
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value6768197819617626838656747477577558607288868871062683633642594661661144179156111
Percentage of PolicyholderBenefitsAndClaimsIncurredNet13.516.216.216.511.615.217.813.315.818.516.417.716.221.620.817.016.516.716.713.915.518.06.36.86.55.2
Percentage of Revenues7.08.27.910.28.58.99.97.58.89.69.99.88.611.311.112.38.48.47.97.08.49.63.13.73.12.5
Percentage of Revenues cb:SegmentInsuranceNorthAmericanPersonalPCMember0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceOverseasGeneral


Policyholder
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1186126313201192148512581221115411251106116611141071107896512819641071105284310891021748674816814
Percentage of PolicyholderBenefitsAndClaimsIncurredNet23.725.027.420.422.628.025.122.823.927.025.322.923.926.322.620.523.328.327.319.725.627.832.525.533.838.4
Percentage of Revenues12.312.713.412.616.516.314.012.813.214.015.312.712.613.812.014.911.914.312.99.913.814.816.013.816.218.5
Percentage of Revenues cb:SegmentInsuranceOverseasGeneral0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentLife


Policyholder
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value185198168183171202176190189202182195184205183181182193165174147177159153137152
Percentage of PolicyholderBenefitsAndClaimsIncurredNet3.73.93.53.12.64.53.63.84.04.93.94.04.15.04.32.94.45.14.34.13.54.86.95.85.77.2
Percentage of Revenues1.92.01.71.91.92.62.02.12.22.62.42.22.22.62.32.12.22.62.02.01.92.63.43.12.73.5
Percentage of Revenues cb:SegmentLife0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Corporate


Policyholder
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value899.05527611383411134811894511
Percentage of PolicyholderBenefitsAndClaimsIncurredNet1.80.20.94.20.20.80.70.30.31.10.31.41.10.3
Percentage of Revenues0.90.10.63.10.10.40.40.10.10.60.11.00.60.1
Percentage of Revenues us-gaap:Corporate0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Premiums Earned Net

us-gaap:PremiumsEarnedNet

us-gaap:PremiumsEarnedNet


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value88138221843087658128779479358327789171377465790876647027721878077237677270597688740565974207471943603927437047544332397043634610406735733848466537833381383144903757330935723422323332773387339332663194
Percentage of PremiumsEarnedNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues91.282.485.692.690.5101.390.892.192.590.697.990.490.189.790.190.789.390.286.490.293.895.989.996.986.489.592.391.490.089.886.089.186.482.982.190.896.480.885.5104.688.386.981.088.086.083.079.392.292.189.3

Realized Investment Gains Losses

us-gaap:RealizedInvestmentGainsLosses

us-gaap:RealizedInvestmentGainsLosses


Realized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312018-09-302018-06-30
Value-33.0887571-141.030-958.0-55.0-155.0-697.040-13.0
Percentage of RealizedInvestmentGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-0.38.95.8-1.50.3-12.4-0.6-1.7-9.10.5-0.2

us-gaap:RealizedInvestmentGainsLosses dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Realized
Period End2020-09-302019-09-30
Value48-219.0
Percentage of RealizedInvestmentGainsLosses-34.0141.3
Percentage of Revenues0.5-2.4
Percentage of Revenues cb:OtherAceLimitedSubsidiariesAndEliminations0.00.0

us-gaap:RealizedInvestmentGainsLosses us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Realized
Period End2021-03-312020-09-302020-03-312019-09-30
Value67-192.011368
Percentage of RealizedInvestmentGainsLosses7.6136.2-11.8-43.9
Percentage of Revenues0.7-2.01.50.8
Percentage of Revenues srt:GuarantorSubsidiaries0.00.00.00.0

srt:ParentCompany


Realized
Period End2021-03-312020-12-312020-09-302020-03-312019-12-312019-09-30
Value13153.0-21.0-18.0-4.0
Percentage of RealizedInvestmentGainsLosses1.52.6-2.12.232.72.6
Percentage of Revenues0.10.20.0-0.3-0.2-0.0
Percentage of Revenues srt:ParentCompany0.00.00.00.00.00.0

us-gaap:RealizedInvestmentGainsLosses us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems


Realized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value3.0-1.03.01.0-1.0-2.00.0-14.0
Percentage of RealizedInvestmentGainsLosses-9.1-0.10.5-0.7-3.30.2-0.09.0
Percentage of Revenues0.0-0.00.00.0-0.0-0.00.0-0.2
Percentage of Revenues us-gaap:MaterialReconcilingItems0.00.00.00.00.00.00.00.0

us-gaap:RealizedInvestmentGainsLosses us-gaap:InvestmentType

cb:Equitysecuritiesandotherinvestments


Realized
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value2124053141-24.0-1.03514
Percentage of RealizedInvestmentGainsLosses-642.445.7-22.0136.72.50.60.00.0
Percentage of Revenues2.24.10.30.5-0.3-0.00.40.2
Percentage of Revenues cb:Equitysecuritiesandotherinvestments0.00.00.00.00.00.00.00.0

us-gaap:OtherInvestments


Realized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-06-302017-03-31
Value62383931-107.05.0-2.0-4.030-44.0-28.05.0-11.0290.00.0
Percentage of RealizedInvestmentGainsLosses-187.94.36.8-22.0-356.7-0.53.62.60.00.04.012.584.60.00.00.0
Percentage of Revenues0.60.40.40.3-1.20.1-0.0-0.00.4-0.6-0.40.1-0.10.40.00.0
Percentage of Revenues us-gaap:OtherInvestments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RealizedInvestmentGainsLosses us-gaap:StatementBusinessSegments

us-gaap:Corporate


Realized
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-30
Value-36.0888-142.031-956.0-141.0
Percentage of RealizedInvestmentGainsLosses109.1100.1100.7103.399.891.0
Percentage of Revenues-0.48.9-1.50.3-12.4-1.6
Percentage of Revenues us-gaap:Corporate0.00.00.00.00.00.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value96649971984894648985769787389045852778767626875085107831801586108108751081688527789768774679487150484389473752004815441950745172470543104687513839264185447942944253380844093888376039494272368135473575
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value197174191977190774187786181474173127176943175148174516171347167771167684167534168781167022167578162988160967159786161810160203156644102366977609984098398982489755797447951799451094584936889346192545935089070189749875058872089254862208335577980
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Assetsdei:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value205503201771196432187209189152189527187607185896181741181250183981182303185724186047180102178654177586180254178643174453108967112608
Percentage of Assets107.7107.4108.2108.1106.9108.2107.5108.5108.3108.1109.8108.0111.2111.0110.5111.0111.1111.4111.5111.4106.4114.6
Percentage of Assets107.7107.4108.2108.1106.9108.2107.5108.5108.3108.1109.8108.0111.2111.0110.5111.0111.1111.4111.5111.4106.4114.6
Percentage of Assets cb:OtherAceLimitedSubsidiariesAndEliminations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Assetsus-gaap:
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value6225589255240532835134953939540945265752784514325099451621
Percentage of Assets0.329.329.429.429.730.530.930.230.830.730.430.9
Percentage of Assets0.329.329.429.429.730.530.930.230.830.730.430.9
Percentage of Assets srt:GuarantorSubsidiaries100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:ParentCompany


Assetsus-gaap:
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value35415976456745559845328455643555485427853017506095144851554
Percentage of Assets1.831.330.230.830.831.431.731.130.930.230.730.9
Percentage of Assets1.831.330.230.830.831.431.731.130.930.230.730.9
Percentage of Assets srt:ParentCompany100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Assetsus-gaap:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-130385.0-125970.0-124225.0-118715.0-121791.0-124021.0-120026.0-120350.0-116011.0-116008.0-121877.0
Percentage of Assets-68.3-67.1-68.5-68.6-68.8-70.8-68.8-70.2-69.1-69.2-73.0
Percentage of Assets-68.3-67.1-68.5-68.6-68.8-70.8-68.8-70.2-69.1-69.2-73.0
Percentage of Assets srt:ConsolidationEliminations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value13711213290113133313137312671412093012161212057612071411899211745911675011656311749411585011710711263911174311151111343811297711074773231686337028568696686616754067122658106568566366663936551965014665456493964318629896497065141628446038158313
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets69.569.268.870.069.869.968.768.869.269.470.069.669.669.669.469.969.169.469.870.170.570.771.570.270.469.869.969.268.969.169.570.270.970.170.371.271.671.772.073.273.072.972.474.8

us-gaap:Liabilities dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Liabilitiesdei:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value1300621280741243941182041189021188071184491175991157051151111167811151871204461212961159031144261142831166601166611131707825776693
Percentage of Liabilities99.097.598.297.797.898.598.198.898.598.6100.298.0104.0103.6102.9102.4102.5102.8103.3102.2106.9111.7
Percentage of Assets68.268.268.568.367.267.867.968.669.068.669.768.272.172.471.171.171.572.172.872.276.478.1
Percentage of Assets cb:OtherAceLimitedSubsidiariesAndEliminations63.363.563.363.162.962.763.163.363.763.563.563.264.965.264.464.064.464.765.364.971.868.1

us-gaap:Liabilities us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Liabilitiesus-gaap:
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value199081995421097202302005021260219622186023437237282347323825
Percentage of Liabilities15.015.216.116.016.617.518.218.119.720.220.120.6
Percentage of Assets10.410.511.211.111.612.012.512.513.714.114.014.3
Percentage of Assets srt:GuarantorSubsidiaries3200.635.738.238.039.039.440.641.544.446.146.046.2

srt:ParentCompany


Liabilitiesus-gaap:
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value33732333212241087312976476662297514382
Percentage of Liabilities0.30.20.31.00.90.30.80.40.60.30.40.3
Percentage of Assets0.20.20.20.70.60.20.60.30.40.20.30.2
Percentage of Assets srt:ParentCompany9.50.50.62.22.00.61.80.91.20.61.00.7

us-gaap:Liabilities us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Liabilitiesus-gaap:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-19006.0-18130.0-19134.0-18411.0-18862.0-21169.0-20071.0-22706.0-22271.0-22348.0-28803.0
Percentage of Liabilities-14.5-13.8-15.1-15.2-15.5-17.6-16.6-19.1-19.0-19.1-24.9
Percentage of Assets-10.0-9.7-10.5-10.6-10.7-12.1-11.5-13.3-13.3-13.3-17.2
Percentage of Assets srt:ConsolidationEliminations14.614.415.415.515.517.116.718.919.219.323.6

us-gaap:Liabilities us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel2


Liabilitiesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value18694182831936520172188211746718238167841640515075145241458014757166051522115173151671493115360161391600311528
Percentage of Liabilities13.613.814.715.414.914.415.013.913.612.712.412.512.714.113.113.013.513.413.814.214.215.7
Percentage of Assets9.59.510.210.710.410.110.39.69.48.88.78.78.89.89.19.19.39.39.610.010.011.3
Percentage of Assets us-gaap:FairValueInputsLevel20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Liabilities us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Liabilitiesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-31
Value166671659216661178511667316526165821501915104143071432214371145051617514285142951430514312148211483514844111006569656870186218
Percentage of Liabilities12.212.512.713.613.213.713.612.512.512.012.212.312.413.812.312.212.712.813.313.113.115.29.69.310.29.1
Percentage of Assets8.58.68.79.59.29.59.48.68.78.38.58.68.79.68.68.58.88.99.39.29.310.86.76.67.16.3
Percentage of Assets us-gaap:CarryingReportedAmountFairValueDisclosure0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.076.770.592.779.4

us-gaap:EstimateOfFairValueFairValueDisclosure


Liabilitiesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-31
Value186941828319365201721882117467182381678416405150751452414580147571660515221151731516714931153601613916003115286938694776036723
Percentage of Liabilities13.613.814.715.414.914.415.013.913.612.712.412.512.714.113.113.013.513.413.814.214.215.710.19.911.19.8
Percentage of Assets9.59.510.210.710.410.110.39.69.48.88.78.78.89.89.19.19.39.39.610.010.011.37.17.07.76.8
Percentage of Assets us-gaap:EstimateOfFairValueFairValueDisclosure0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.079.373.696.383.1

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value197174191977190774187786181474173127176943175148174516171347167771167684167534168781167022167578162988160967159786161810160203156644102366977609984098398982489755797447951799451094584936889346192545935089070189749875058872089254862208335577980
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesAndStockholdersEquity dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Liabilities
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value205503201771196432187209189152189527187607185896181741181250183981182303185724186047180102178654177586180254178643174453108967112608
Percentage of LiabilitiesAndStockholdersEquity107.7107.4108.2108.1106.9108.2107.5108.5108.3108.1109.8108.0111.2111.0110.5111.0111.1111.4111.5111.4106.4114.6
Percentage of Assets107.7107.4108.2108.1106.9108.2107.5108.5108.3108.1109.8108.0111.2111.0110.5111.0111.1111.4111.5111.4106.4114.6
Percentage of Assets cb:OtherAceLimitedSubsidiariesAndEliminations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesAndStockholdersEquity us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Liabilities
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value6225589255240532835134953939540945265752784514325099451621
Percentage of LiabilitiesAndStockholdersEquity0.329.329.429.429.730.530.930.230.830.730.430.9
Percentage of Assets0.329.329.429.429.730.530.930.230.830.730.430.9
Percentage of Assets srt:GuarantorSubsidiaries100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:ParentCompany


Liabilities
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value35415976456745559845328455643555485427853017506095144851554
Percentage of LiabilitiesAndStockholdersEquity1.831.330.230.830.831.431.731.130.930.230.730.9
Percentage of Assets1.831.330.230.830.831.431.731.130.930.230.730.9
Percentage of Assets srt:ParentCompany100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesAndStockholdersEquity us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Liabilities
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-130385.0-125970.0-124225.0-118715.0-121791.0-124021.0-120026.0-120350.0-116011.0-116008.0-121877.0
Percentage of LiabilitiesAndStockholdersEquity-68.3-67.1-68.5-68.6-68.8-70.8-68.8-70.2-69.1-69.2-73.0
Percentage of Assets-68.3-67.1-68.5-68.6-68.8-70.8-68.8-70.2-69.1-69.2-73.0
Percentage of Assets srt:ConsolidationEliminations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value6006259076594415641354760521975533154572538025235550312509345097151287511725047150349492244827548372472264589729135291272955529587
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets30.530.831.230.030.230.131.331.230.830.630.030.430.430.430.630.130.930.630.229.929.529.328.529.829.630.1

us-gaap:StockholdersEquity dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Stockholders
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value73697720386900570250707206915868297660366613967200671166527864751641996422863303635946198230710
Percentage of StockholdersEquity130.6131.6132.2127.0129.6128.5130.4131.3129.9131.8130.9127.6128.3127.5130.5131.1131.5131.2105.4
Percentage of Assets39.239.739.939.740.439.639.939.439.440.139.839.138.639.439.939.639.338.730.0
Percentage of Assets cb:OtherAceLimitedSubsidiariesAndEliminations36.536.736.937.137.336.936.736.336.536.536.835.134.835.636.035.635.334.728.2

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Stockholders
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-19286.0-19293.034143330533129932679321323079729347277042752127796
Percentage of StockholdersEquity-32.6-32.560.560.460.059.158.957.256.155.154.054.3
Percentage of Assets-10.0-10.118.218.218.118.518.317.617.116.516.416.6
Percentage of Assets srt:GuarantorSubsidiaries-3100.6-34.561.862.061.060.659.458.555.653.954.053.8

srt:ParentCompany


Stockholders
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value32045944156413547605219755331545725380252355503125093451172
Percentage of StockholdersEquity5.4100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.731.230.030.230.131.331.230.830.630.030.430.6
Percentage of Assets srt:ParentCompany90.599.599.497.898.099.498.299.198.899.499.099.3

us-gaap:StockholdersEquity us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Stockholders
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-107840.0-105091.0-100304.0-102929.0-102852.0-99955.0-97644.0-93740.0-93660.0-93074.0
Percentage of StockholdersEquity-191.2-191.9-192.2-186.0-188.5-185.8-186.5-186.3-183.9-181.9
Percentage of Assets-57.4-57.9-57.9-58.2-58.7-57.3-57.0-55.9-55.9-55.7
Percentage of Assets srt:ConsolidationEliminations85.684.684.584.582.983.381.180.880.776.4

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

srt:CumulativeEffectPeriodOfAdoptionAdjustedBalance, us-gaap:RetainedEarnings


Stockholders
Period End2021-03-312020-12-312020-06-302020-03-312019-12-312019-06-302018-12-312017-12-31
Value4163739337359913632236070338783168827738
Percentage of StockholdersEquity70.566.265.769.665.263.063.054.2
Percentage of Assets21.720.619.821.020.419.418.916.6
Percentage of Assets srt:CumulativeEffectPeriodOfAdoptionAdjustedBalance us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value-197.0-190.0-167.0-31.0-13.04.01524375273231249261280202253267291-62.0-66.0-69.0-70.0-71.0-74.0-79.0-85.0
Percentage of StockholdersEquity-0.3-0.3-0.3-0.1-0.00.00.00.00.10.10.10.50.50.50.50.40.50.50.6-0.1-0.1-0.2-0.2-0.2-0.3-0.30.0
Percentage of Assets-0.1-0.1-0.1-0.0-0.00.00.00.00.00.00.00.10.10.20.20.10.20.20.2-0.0-0.0-0.0-0.1-0.1-0.1-0.1-0.1
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value334227614673396734246672543261320331014-545.0-549.0-390.046145016431551126510582547240416988741285154018511174
Percentage of StockholdersEquity5.64.77.97.06.31.34.64.83.81.9-1.1-1.1-0.80.12.83.33.12.62.25.35.13.73.04.45.26.30.0
Percentage of Assets1.71.42.42.11.90.41.41.51.20.6-0.3-0.3-0.20.00.91.01.00.80.71.61.51.10.91.31.51.91.2
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value1822958286918561098-2093.0619521139-770.0-2448.0-2159.0-1520.0-502.054310693700.0-314.011971181367-735.0-192.06071191
Percentage of StockholdersEquity3.01.64.83.32.0-4.01.11.00.3-1.5-4.9-4.2-3.0-1.01.12.10.70.0-0.72.52.50.8-2.5-0.72.14.0
Percentage of Assets0.90.51.51.00.6-1.20.30.30.1-0.4-1.5-1.3-0.9-0.30.30.60.20.0-0.20.70.70.2-0.7-0.20.61.2
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value-1323.0-1613.0-1637.0-2080.0-2313.0-2764.0-1939.0-2116.0-1931.0-1836.0-1976.0-1841.0-1379.0-809.0-1187.0-776.0-1434.0-1532.0-1663.0-1288.0-1157.0-1262.0-1539.0-1406.0-859.0-581.063
Percentage of StockholdersEquity-2.2-2.7-2.8-3.7-4.2-5.3-3.5-3.9-3.6-3.5-3.9-3.6-2.7-1.6-2.3-1.5-2.8-3.1-3.4-2.7-2.4-2.7-5.3-4.8-2.9-2.00.0
Percentage of Assets-0.7-0.8-0.9-1.1-1.3-1.6-1.1-1.2-1.1-1.1-1.2-1.1-0.8-0.5-0.7-0.5-0.9-1.0-1.0-0.8-0.7-0.8-1.5-1.4-0.9-0.60.1
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value9046931898151011510416107101120311465117571205112557128531315013430139781421714522147951533515601158581614044814665484751455238
Percentage of StockholdersEquity15.115.816.517.919.020.520.221.021.923.025.025.225.826.227.328.228.830.131.832.333.635.215.416.016.417.40.0
Percentage of Assets4.64.95.15.45.76.26.36.56.77.07.57.77.88.08.48.58.99.29.69.69.910.34.44.84.95.25.5
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value1106411064110641106411121111211112111121111211112111121111211112111121111211112111121111211112111121111211112178337833783380558899
Percentage of StockholdersEquity18.418.718.619.620.321.320.120.420.721.222.121.821.821.721.722.022.122.623.023.023.524.226.926.926.527.20.0
Percentage of Assets5.65.85.85.96.16.46.36.36.46.56.66.66.66.66.76.66.86.97.06.96.97.17.78.07.88.29.4
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value439024163739337369193599136331361423496933878327283170031491302602896527474259412601124706236132200320643199171947818795182671664413791
Percentage of StockholdersEquity73.170.566.265.465.769.665.364.163.062.563.061.859.456.553.751.451.750.248.945.543.743.466.964.561.856.30.0
Percentage of Assets22.321.720.619.719.821.020.420.019.419.118.918.818.117.216.415.516.015.314.813.612.912.719.019.218.316.914.6
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value-5772.0-3901.0-3644.0-3541.0-3866.0-3872.0-3754.0-3504.0-3093.0-2775.0-2618.0-2372.0-2040.0-1727.0-1944.0-1877.0-1675.0-1398.0-1480.0-1550.0-1577.0-1648.0-1922.0-1974.0-1999.0-1448.0-255.0
Percentage of StockholdersEquity-9.6-6.6-6.1-6.3-7.1-7.4-6.8-6.4-5.7-5.3-5.2-4.7-4.0-3.4-3.8-3.7-3.3-2.8-3.1-3.2-3.3-3.6-6.6-6.8-6.8-4.90.0
Percentage of Assets-2.9-2.0-1.9-1.9-2.1-2.2-2.1-2.0-1.8-1.6-1.6-1.4-1.2-1.0-1.2-1.1-1.0-0.9-0.9-1.0-1.0-1.1-1.9-2.0-2.0-1.5-0.3
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value1843168417471707155715121537147812701271124710531000198872810881297106398587010111091177510387909486558065948475797686798556156906177156147668331115772487668726669867510
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.90.90.90.90.90.90.90.80.70.70.70.60.61.20.40.60.80.70.60.50.60.71.71.10.81.00.70.80.60.90.60.80.70.90.70.70.70.80.70.90.91.30.90.00.00.00.90.00.0

us-gaap:CashAndCashEquivalentsAtCarryingValue dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-31
Value19341799262421931093270616252220189612982238152383911741323232819652158182524062743217712096581209748859
Percentage of CashAndCashEquivalentsAtCarryingValue110.7105.4168.5145.071.1183.1128.0174.7152.0123.3223.876.6115.2107.9102.0219.0199.5248.0180.5220.5154.5209.7153.069.4184.6129.2139.7
Percentage of Assets1.01.01.41.30.61.50.91.31.10.81.30.90.50.70.81.41.21.31.11.52.72.21.20.71.20.80.9
Percentage of Assets cb:OtherAceLimitedSubsidiariesAndEliminations0.90.91.31.20.61.40.91.21.00.71.20.80.50.60.71.31.11.21.01.42.50.00.00.01.10.00.0

us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Cash
Period End2021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value1.01.00.0494420.01.0712.01.01.0
Percentage of CashAndCashEquivalentsAtCarryingValue0.10.10.03.228.80.00.15.60.20.10.1
Percentage of Assets0.00.00.00.00.20.00.00.00.00.00.0
Percentage of Assets srt:GuarantorSubsidiaries0.20.00.00.10.80.00.00.10.00.00.0

srt:ParentCompany


Cash
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312016-12-312015-12-31
Value2384311.010.02.02.01.02.01.00.03.01.01.0
Percentage of CashAndCashEquivalentsAtCarryingValue1.44.81.80.10.70.10.10.10.20.10.00.40.10.1
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets srt:ParentCompany0.60.10.10.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-272.0-123.0-1068.0-740.00.0-1230.0-357.0-1022.0-652.0-246.0-115.0
Percentage of CashAndCashEquivalentsAtCarryingValue-15.6-7.2-68.6-48.90.0-83.2-28.1-80.4-52.3-23.4-15.8
Percentage of Assets-0.1-0.1-0.6-0.40.0-0.7-0.2-0.6-0.4-0.1-0.1
Percentage of Assets srt:ConsolidationEliminations0.20.10.90.6-0.01.00.30.80.60.20.1

us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

country:US, us-gaap:PensionPlansDefinedBenefit


Cash
Period End2020-12-31
Value14
Percentage of CashAndCashEquivalentsAtCarryingValue0.8
Percentage of Assets0.0
Percentage of Assets country:US us-gaap:PensionPlansDefinedBenefit0.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value1998184118361873170916581646158913681393134011571101211385111931419116010881885
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.01.01.01.00.91.00.90.90.80.80.80.70.71.30.50.70.90.70.71.8

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value20231965277623391202281717232342198914022339164896212791445242520682853
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents110.2104.9162.4141.173.0177.3126.0168.1148.4121.2212.478.0113.0107.2101.8209.1190.1151.4
Percentage of Assets1.11.01.51.40.71.61.01.41.20.81.41.00.60.80.91.51.32.8
Percentage of Assets cb:OtherAceLimitedSubsidiariesAndEliminations1.01.01.41.20.61.50.91.31.10.81.30.90.50.70.81.41.22.6

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Cash
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312015-12-31
Value1.00.0494420.01.0712.01.01.08641.00.01.02.0
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents0.10.03.026.90.00.15.10.10.10.140.90.10.00.10.1
Percentage of Assets0.00.00.00.20.00.00.00.00.00.00.50.00.00.00.0
Percentage of Assets srt:GuarantorSubsidiaries0.00.00.10.80.00.00.10.00.00.00.00.00.00.00.0

srt:ParentCompany


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312015-12-31
Value84311.010.02.02.01.02.01.00.01.01.03.01.01.01.0
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents4.61.70.10.60.10.10.10.10.10.00.10.00.40.10.10.1
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets srt:ParentCompany0.10.10.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312015-12-31
Value-272.0-123.0-1068.0-740.00.0-1230.0-357.0-1022.0-652.0-246.0-1240.0-400.0-115.0-87.0-982.0-971.0
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents-14.8-6.6-62.5-44.60.0-77.4-26.1-73.4-48.7-21.3-112.6-18.9-13.5-7.3-90.3-51.5
Percentage of Assets-0.1-0.1-0.6-0.40.0-0.7-0.2-0.6-0.4-0.1-0.7-0.2-0.1-0.1-0.6-0.9
Percentage of Assets srt:ConsolidationEliminations0.20.10.90.6-0.01.00.30.80.60.20.00.00.10.00.00.0

Amortization Of Intangible Assets

us-gaap:AmortizationOfIntangibleAssets

us-gaap:AmortizationOfIntangibleAssets


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value7372737272737676777686838585666565643.04.05.07.0355155303027
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AmortizationOfIntangibleAssets dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Amortization
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value7272737677768385856565644.05.07.035515530
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets cb:OtherAceLimitedSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AmortizationOfIntangibleAssets us-gaap:StatementBusinessSegments

cb:SegmentInsuranceNorthAmericanAgriculture


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value6.07.07.07.06.07.07.07.07.07.07.07.07.07.07.08.07.07.07.07.08.07.08.08.0
Percentage of AmortizationOfIntangibleAssets8.29.79.69.78.39.69.29.29.19.28.18.48.28.210.612.310.810.9233.3175.0160.0100.022.915.7
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets cb:SegmentInsuranceNorthAmericanAgriculture0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceNorthAmericanPersonalPCMember


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value3.03.03.02.03.03.03.03.03.03.03.04.03.03.04.04.05.03.03.04.04.08.01531
Percentage of AmortizationOfIntangibleAssets4.14.24.12.84.24.13.93.93.93.93.54.83.53.56.16.27.74.7100.0100.080.0114.342.960.8
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets cb:SegmentInsuranceNorthAmericanPersonalPCMember0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceOverseasGeneral


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value13121210.0111211111211128.01110.012111111121213111112
Percentage of AmortizationOfIntangibleAssets17.816.716.413.915.316.414.514.515.614.514.09.612.911.818.216.916.917.2400.0300.0260.0157.131.423.5
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets cb:SegmentInsuranceOverseasGeneral0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentLife


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value1.01.01.01.01.01.00.01.01.00.01.00.00.01.00.01.00.01.01.01.00.01.01.00.0
Percentage of AmortizationOfIntangibleAssets1.41.41.41.41.41.40.01.31.30.01.20.00.01.20.01.50.01.633.325.00.014.32.90.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets cb:SegmentLife0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Corporate


Amortization
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value5049525150545455646464414242
Percentage of AmortizationOfIntangibleAssets68.568.172.270.868.571.170.172.477.175.375.363.164.665.6
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:Corporate0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value20001900170013001200938
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0
Percentage of Assets1.01.11.00.80.80.9

us-gaap:PropertyPlantAndEquipmentNet us-gaap:PropertyPlantAndEquipmentByType

us-gaap:Building


Property
Period End2020-12-312019-12-312018-12-31
Value260270277
Percentage of PropertyPlantAndEquipmentNet13.014.216.3
Percentage of Assets0.10.20.2
Percentage of Assets us-gaap:Building0.00.00.0

us-gaap:SoftwareDevelopment


Property
Period End2020-12-312019-12-312018-12-31
Value13001100970
Percentage of PropertyPlantAndEquipmentNet65.057.957.1
Percentage of Assets0.70.60.6
Percentage of Assets us-gaap:SoftwareDevelopment0.00.00.0

Investments In Affiliates Subsidiaries Associates And Joint Ventures

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures


Investments
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2813133210641050708678656675664662652662666666665658654653654638590504495470466470468452449454354339346380371353348360433
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.50.80.60.60.40.40.40.40.40.40.40.40.40.40.40.40.40.60.70.60.60.50.50.50.50.50.50.50.50.50.40.40.40.40.40.40.40.40.6

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

cb:ABRReinsuranceCapitalHoldingsLtd., country:BM


Investments
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value11410091939794
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures4.17.513.414.014.614.4
Percentage of Assets0.10.10.10.10.10.1
Percentage of Assets cb:ABRReinsuranceCapitalHoldingsLtd. country:BM0.00.00.00.00.00.0

cb:ChubbArabiaCooperativeInsuranceCompany, country:SA


Investments
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value232018151311
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures0.81.52.72.32.01.7
Percentage of Assets0.00.00.00.00.00.0
Percentage of Assets cb:ChubbArabiaCooperativeInsuranceCompany country:SA0.00.00.00.00.00.0

cb:FreisenbruchMeyer, country:BM


Investments
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value10.010.09.09.08.09.0
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures0.40.81.31.41.21.4
Percentage of Assets0.00.00.00.00.00.0
Percentage of Assets cb:FreisenbruchMeyer country:BM0.00.00.00.00.00.0

cb:HuataiGroup, country:CN


Investments
Period End2020-12-312019-12-312018-12-31
Value24611053452
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures87.579.166.7
Percentage of Assets1.30.60.3
Percentage of Assets cb:HuataiGroup country:CN0.00.00.0

cb:HuataiLifeInsuranceCo., country:CN


Investments
Period End2020-12-312019-12-312018-12-31
Value201147106
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures7.111.015.6
Percentage of Assets0.10.10.1
Percentage of Assets cb:HuataiLifeInsuranceCo. country:CN0.00.00.0

cb:RussianReinsuranceCompany, country:RU


Investments
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value4.02.02.02.02.02.0
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures0.10.20.30.30.30.3
Percentage of Assets0.00.00.00.00.00.0
Percentage of Assets cb:RussianReinsuranceCompany country:RU0.00.00.00.00.00.0

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value1550615412154001525415184149711529615230153001532815271153321547615686155411570715434153871533215481155251540447964904460343194180403038143622
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.98.08.18.18.48.68.68.78.88.99.19.19.29.39.39.49.59.69.69.69.79.84.75.04.94.74.84.84.90.0

us-gaap:Goodwill us-gaap:StatementBusinessSegments

cb:SegmentGlobalReinsurance


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-31
Value371371371365
Percentage of Goodwill2.42.42.42.3
Percentage of Assets0.20.20.20.2
Percentage of Assets cb:SegmentGlobalReinsurance0.00.00.00.0

cb:SegmentInsuranceNorthAmericanPersonalPCMember


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value224022342230224022352234223922341960.0
Percentage of Goodwill14.514.614.614.414.614.414.414.54.10.0
Percentage of Assets1.21.31.31.31.41.41.41.40.20.0
Percentage of Assets cb:SegmentInsuranceNorthAmericanPersonalPCMember0.00.00.00.00.00.00.00.00.00.0

cb:SegmentInsuranceOverseasGeneral


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-31
Value48364785477050044817497049934940207823662054
Percentage of Goodwill31.431.331.232.231.432.132.232.143.348.244.6
Percentage of Assets2.52.72.83.03.03.13.13.22.02.42.2
Percentage of Assets cb:SegmentInsuranceOverseasGeneral0.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentLife


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-31
Value847817820822820821821821820828835
Percentage of Goodwill5.55.35.45.35.35.35.35.317.116.918.1
Percentage of Assets0.40.50.50.50.50.50.50.50.80.80.9
Percentage of Assets cb:SegmentLife0.00.00.00.00.00.00.00.00.00.00.0

cb:SegmentNorthAmericaCommercialPCInsurance


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value6972695569466976696112031211
Percentage of Goodwill45.345.545.544.945.425.124.7
Percentage of Assets3.73.94.14.24.41.21.2
Percentage of Assets cb:SegmentNorthAmericaCommercialPCInsurance0.00.00.00.00.00.00.0

Indefinite Lived Intangible Assets Excluding Goodwill

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill


Indefinite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value2965290029003000300098103106102
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.61.61.71.81.90.10.10.10.1

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill


Intangible
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value5694574958115849590959026063614862666091614361396283643765136558657966746763699173987955887
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.93.03.03.13.33.43.43.53.63.63.73.73.83.83.93.94.04.14.24.34.65.10.9

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:FiniteLivedIntangibleAssetsNet


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value28463200320035003800789717695554
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.51.81.92.12.40.80.70.70.6

Intangible Assets Net Including Goodwill

us-gaap:IntangibleAssetsNetIncludingGoodwill

us-gaap:IntangibleAssetsNetIncludingGoodwill


Intangible
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value21211211032109320873213592137821566214192141421471217592212322054222652201322061220952247222923233595683571359695516572454255522538254045465539549094975499048264799
Percentage of IntangibleAssetsNetIncludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.111.211.612.112.112.212.412.512.812.813.013.113.213.313.513.713.813.914.314.95.65.86.05.65.85.65.75.75.75.85.85.35.45.35.35.5

us-gaap:IntangibleAssetsNetIncludingGoodwill dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Intangible
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value212112110321093208732135921378215662141921414214712175922123220542226522013220612209522472229232335956835724
Percentage of IntangibleAssetsNetIncludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.111.211.612.112.112.212.412.512.812.813.013.113.213.313.513.713.813.914.314.95.65.8
Percentage of Assets cb:OtherAceLimitedSubsidiariesAndEliminations10.310.510.711.111.311.311.511.511.811.811.812.111.912.012.212.312.412.512.813.45.25.1

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value429448473470483509551
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.20.30.30.30.3

Equity Securities Fv Ni

us-gaap:EquitySecuritiesFvNi

us-gaap:EquitySecuritiesFvNi


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value460744054027308823942068812722715821770
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.32.32.11.61.31.20.50.40.40.50.5

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

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value452943303954302223292001728662659766713
Percentage of EquitySecuritiesFvNi98.398.398.297.997.396.889.791.792.293.392.6
Percentage of Assets2.32.32.11.61.31.20.40.40.40.40.4
Percentage of Assets us-gaap:FairValueInputsLevel1 us-gaap:FairValueMeasurementsRecurring0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value7875736664676956565557
Percentage of EquitySecuritiesFvNi1.71.71.82.12.73.28.57.87.86.77.4
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:FairValueInputsLevel3 us-gaap:FairValueMeasurementsRecurring0.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value460744054027308823942068812722715821770
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.32.32.11.61.31.20.50.40.40.50.5
Percentage of Assets us-gaap:EstimateOfFairValueFairValueDisclosure us-gaap:FairValueMeasurementsRecurring0.00.00.00.00.00.00.00.00.00.00.0

Other Assets

us-gaap:OtherAssets

us-gaap:OtherAssets


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value97688967882287349239861275817878747776756531700263386345635864025669558250905521494551503881404240663730355640063750344233303572336129362871328127762955249521932428261121961954
Percentage of OtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.04.74.64.75.15.04.34.54.34.53.94.23.83.83.83.83.53.53.23.43.13.33.84.14.13.83.64.13.83.63.53.83.63.13.13.53.13.32.92.52.73.02.62.5

us-gaap:OtherAssets us-gaap:ConsolidatedEntities

srt:ParentCompany


Other
Period End2020-12-312019-12-312018-12-312017-12-31
Value10.0123.03.0
Percentage of OtherAssets0.10.20.00.0
Percentage of Assets0.00.00.00.0
Percentage of Assets srt:ParentCompany0.00.00.00.0

Long Term Debt

us-gaap:LongTermDebt

us-gaap:LongTermDebt


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value149541487914948148301365613510135591328513371120711208712149121841278611556115591166712300126101262112631126369447415741574157335740574057380838073807380743073360336033603360336033603360335833583158
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.67.87.87.97.57.87.77.67.77.07.27.27.37.66.96.97.27.67.97.87.98.19.24.34.24.23.44.24.24.04.04.04.14.63.63.63.73.73.83.83.83.94.04.0

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value58148289281569647480476669754130436332646869911391122967988141814090.0
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.30.30.50.40.40.30.50.40.40.30.20.20.20.30.40.70.70.60.60.90.90.0

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value468490517517531563603
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.30.30.30.30.30.3

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-31
Value550
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0
Percentage of Assets0.3

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-31
Value33
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0
Percentage of Assets0.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value6006259076594415641354760521975533154572538025235550312509345097151287511725047150349492244827548372472264589729135291272955529587
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets30.530.831.230.030.230.131.331.230.830.630.030.430.430.430.630.130.930.630.229.929.529.328.529.829.630.1

us-gaap:StockholdersEquity dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Stockholders
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value73697720386900570250707206915868297660366613967200671166527864751641996422863303635946198230710
Percentage of StockholdersEquity130.6131.6132.2127.0129.6128.5130.4131.3129.9131.8130.9127.6128.3127.5130.5131.1131.5131.2105.4
Percentage of Assets39.239.739.939.740.439.639.939.439.440.139.839.138.639.439.939.639.338.730.0
Percentage of Assets cb:OtherAceLimitedSubsidiariesAndEliminations36.536.736.937.137.336.936.736.336.536.536.835.134.835.636.035.635.334.728.2

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Stockholders
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-19286.0-19293.034143330533129932679321323079729347277042752127796
Percentage of StockholdersEquity-32.6-32.560.560.460.059.158.957.256.155.154.054.3
Percentage of Assets-10.0-10.118.218.218.118.518.317.617.116.516.416.6
Percentage of Assets srt:GuarantorSubsidiaries-3100.6-34.561.862.061.060.659.458.555.653.954.053.8

srt:ParentCompany


Stockholders
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value32045944156413547605219755331545725380252355503125093451172
Percentage of StockholdersEquity5.4100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.731.230.030.230.131.331.230.830.630.030.430.6
Percentage of Assets srt:ParentCompany90.599.599.497.898.099.498.299.198.899.499.099.3

us-gaap:StockholdersEquity us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Stockholders
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-107840.0-105091.0-100304.0-102929.0-102852.0-99955.0-97644.0-93740.0-93660.0-93074.0
Percentage of StockholdersEquity-191.2-191.9-192.2-186.0-188.5-185.8-186.5-186.3-183.9-181.9
Percentage of Assets-57.4-57.9-57.9-58.2-58.7-57.3-57.0-55.9-55.9-55.7
Percentage of Assets srt:ConsolidationEliminations85.684.684.584.582.983.381.180.880.776.4

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

srt:CumulativeEffectPeriodOfAdoptionAdjustedBalance, us-gaap:RetainedEarnings


Stockholders
Period End2021-03-312020-12-312020-06-302020-03-312019-12-312019-06-302018-12-312017-12-31
Value4163739337359913632236070338783168827738
Percentage of StockholdersEquity70.566.265.769.665.263.063.054.2
Percentage of Assets21.720.619.821.020.419.418.916.6
Percentage of Assets srt:CumulativeEffectPeriodOfAdoptionAdjustedBalance us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value-197.0-190.0-167.0-31.0-13.04.01524375273231249261280202253267291-62.0-66.0-69.0-70.0-71.0-74.0-79.0-85.0
Percentage of StockholdersEquity-0.3-0.3-0.3-0.1-0.00.00.00.00.10.10.10.50.50.50.50.40.50.50.6-0.1-0.1-0.2-0.2-0.2-0.3-0.30.0
Percentage of Assets-0.1-0.1-0.1-0.0-0.00.00.00.00.00.00.00.10.10.20.20.10.20.20.2-0.0-0.0-0.0-0.1-0.1-0.1-0.1-0.1
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value334227614673396734246672543261320331014-545.0-549.0-390.046145016431551126510582547240416988741285154018511174
Percentage of StockholdersEquity5.64.77.97.06.31.34.64.83.81.9-1.1-1.1-0.80.12.83.33.12.62.25.35.13.73.04.45.26.30.0
Percentage of Assets1.71.42.42.11.90.41.41.51.20.6-0.3-0.3-0.20.00.91.01.00.80.71.61.51.10.91.31.51.91.2
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value1822958286918561098-2093.0619521139-770.0-2448.0-2159.0-1520.0-502.054310693700.0-314.011971181367-735.0-192.06071191
Percentage of StockholdersEquity3.01.64.83.32.0-4.01.11.00.3-1.5-4.9-4.2-3.0-1.01.12.10.70.0-0.72.52.50.8-2.5-0.72.14.0
Percentage of Assets0.90.51.51.00.6-1.20.30.30.1-0.4-1.5-1.3-0.9-0.30.30.60.20.0-0.20.70.70.2-0.7-0.20.61.2
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value-1323.0-1613.0-1637.0-2080.0-2313.0-2764.0-1939.0-2116.0-1931.0-1836.0-1976.0-1841.0-1379.0-809.0-1187.0-776.0-1434.0-1532.0-1663.0-1288.0-1157.0-1262.0-1539.0-1406.0-859.0-581.063
Percentage of StockholdersEquity-2.2-2.7-2.8-3.7-4.2-5.3-3.5-3.9-3.6-3.5-3.9-3.6-2.7-1.6-2.3-1.5-2.8-3.1-3.4-2.7-2.4-2.7-5.3-4.8-2.9-2.00.0
Percentage of Assets-0.7-0.8-0.9-1.1-1.3-1.6-1.1-1.2-1.1-1.1-1.2-1.1-0.8-0.5-0.7-0.5-0.9-1.0-1.0-0.8-0.7-0.8-1.5-1.4-0.9-0.60.1
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value9046931898151011510416107101120311465117571205112557128531315013430139781421714522147951533515601158581614044814665484751455238
Percentage of StockholdersEquity15.115.816.517.919.020.520.221.021.923.025.025.225.826.227.328.228.830.131.832.333.635.215.416.016.417.40.0
Percentage of Assets4.64.95.15.45.76.26.36.56.77.07.57.77.88.08.48.58.99.29.69.69.910.34.44.84.95.25.5
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value1106411064110641106411121111211112111121111211112111121111211112111121111211112111121111211112111121111211112178337833783380558899
Percentage of StockholdersEquity18.418.718.619.620.321.320.120.420.721.222.121.821.821.721.722.022.122.623.023.023.524.226.926.926.527.20.0
Percentage of Assets5.65.85.85.96.16.46.36.36.46.56.66.66.66.66.76.66.86.97.06.96.97.17.78.07.88.29.4
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value439024163739337369193599136331361423496933878327283170031491302602896527474259412601124706236132200320643199171947818795182671664413791
Percentage of StockholdersEquity73.170.566.265.465.769.665.364.163.062.563.061.859.456.553.751.451.750.248.945.543.743.466.964.561.856.30.0
Percentage of Assets22.321.720.619.719.821.020.420.019.419.118.918.818.117.216.415.516.015.314.813.612.912.719.019.218.316.914.6
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value-5772.0-3901.0-3644.0-3541.0-3866.0-3872.0-3754.0-3504.0-3093.0-2775.0-2618.0-2372.0-2040.0-1727.0-1944.0-1877.0-1675.0-1398.0-1480.0-1550.0-1577.0-1648.0-1922.0-1974.0-1999.0-1448.0-255.0
Percentage of StockholdersEquity-9.6-6.6-6.1-6.3-7.1-7.4-6.8-6.4-5.7-5.3-5.2-4.7-4.0-3.4-3.8-3.7-3.3-2.8-3.1-3.2-3.3-3.6-6.6-6.8-6.8-4.90.0
Percentage of Assets-2.9-2.0-1.9-1.9-2.1-2.2-2.1-2.0-1.8-1.6-1.6-1.4-1.2-1.0-1.2-1.1-1.0-0.9-0.9-1.0-1.0-1.1-1.9-2.0-2.0-1.5-0.3
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value5944155331503125117248275458972913529127295552970229587300173032529369288252821827295279422753126963257622543124516237502411323376229742284521410206361966714446
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets31.231.330.030.630.229.328.529.829.630.230.130.831.130.930.529.829.129.929.728.828.428.328.026.827.027.127.60.00.00.025.20.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312016-03-312015-12-312014-12-31
Value7544170250660366527863303612833071035915
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest126.9127.0131.3127.6131.1133.5105.4121.4
Percentage of Assets39.539.739.439.139.639.130.036.6
Percentage of Assets cb:OtherAceLimitedSubsidiariesAndEliminations36.737.136.335.135.635.128.231.9

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-31
Value35938326792770427796
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest60.559.155.154.3
Percentage of Assets18.818.516.516.6
Percentage of Assets srt:GuarantorSubsidiaries64.360.653.953.8

srt:ParentCompany


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-31
Value59441553315031251172
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0
Percentage of Assets31.231.330.030.6
Percentage of Assets srt:ParentCompany99.599.499.499.3

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-31
Value-111379.0-102929.0-93740.0-93074.0
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-187.4-186.0-186.3-181.9
Percentage of Assets-58.4-58.2-55.9-55.7
Percentage of Assets srt:ConsolidationEliminations85.484.580.876.4

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1106411064110641106411121111211112111121111211112111121111211112111121111211112111121111211112111121111211112178337833783378338055827885018724889990739249942395919759992710095100951009510098100751016110503
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.65.85.85.96.16.46.36.36.46.56.66.66.66.66.76.66.86.97.06.96.97.17.78.07.88.08.28.58.79.29.49.69.910.110.410.410.911.211.511.411.311.712.213.5

us-gaap:CommonStockValue us-gaap:ConsolidatedEntities

srt:ParentCompany


Common
Period End2020-12-312019-12-312018-12-312017-12-31
Value11064111211112111121
Percentage of CommonStockValue100.0100.0100.0100.0
Percentage of Assets5.86.36.66.7
Percentage of Assets srt:ParentCompany18.520.022.021.6

Additional Paid In Capital

us-gaap:AdditionalPaidInCapital us-gaap:ConsolidatedEntities

us-gaap:AdditionalPaidInCapital

srt:ParentCompany


Additional
Period End2020-12-312019-12-312018-12-312017-12-31
Value9815112031255713978
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0
Percentage of Assets5.16.37.58.4
Percentage of Assets srt:ParentCompany16.420.124.827.1

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AdditionalPaidInCapitalCommonStock


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value9046931898151011510416107101120311465117571205112557128531315013430139781421715335
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.64.95.15.45.76.26.36.56.77.07.57.77.88.08.48.59.6

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value4390241637393373691935991363313614234969338783272831700314913026028965274742594126011247062361322003206431991719478187951826717325166441608915304145251379112793118771098610033926886288300751167616792618559262818
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets22.321.720.619.719.821.020.420.019.419.118.918.818.117.216.415.516.015.314.813.612.912.719.019.218.317.616.916.515.715.314.613.512.711.810.89.99.59.28.67.67.67.27.13.6

us-gaap:RetainedEarningsAccumulatedDeficit us-gaap:ConsolidatedEntities

srt:ParentCompany


Retained
Period End2020-12-312019-12-312018-12-312017-12-31
Value39337361423170027474
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0
Percentage of Assets20.620.418.916.4
Percentage of Assets srt:ParentCompany65.865.062.653.3

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1822958286918561098-2093.0619521139-770.0-2448.0-2159.0-1520.0-502.054310693700.0-314.011971181367-735.0-192.0607115211911608209515261152137412602650288730142338220919111839198917821594823
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.90.51.51.00.6-1.20.30.30.1-0.4-1.5-1.3-0.9-0.30.30.60.20.0-0.20.70.70.2-0.7-0.20.61.21.21.62.11.61.21.51.32.83.13.22.62.52.22.12.22.11.91.1

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:ConsolidatedEntities

srt:ParentCompany


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-31
Value2869619-2448.0543
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0
Percentage of Assets1.50.3-1.50.3
Percentage of Assets srt:ParentCompany4.81.1-4.81.1

Treasury Stock Value

us-gaap:TreasuryStockValue

us-gaap:TreasuryStockValue


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value57723901364435413866387237543504309327752618237220401727194418771675139814801550157716481922197419991645144810576304432552222192121591872062273273502502513303.0
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.92.01.91.92.12.22.12.01.81.61.61.41.21.01.21.11.00.90.91.01.01.11.92.02.01.71.51.10.60.50.30.20.20.20.20.20.20.30.40.40.30.30.40.0

us-gaap:TreasuryStockValue us-gaap:ConsolidatedEntities

srt:ParentCompany


Treasury
Period End2020-12-312019-12-312018-12-312017-12-31
Value3644375426181944
Percentage of TreasuryStockValue100.0100.0100.0100.0
Percentage of Assets1.92.11.61.2
Percentage of Assets srt:ParentCompany6.16.75.23.8

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-03-31
Value816672595569896063549963616210867916563801056529444863325348527.079634242322833363237343831
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3122210525443544198517121429220513861322158310201165808816107512741126846125012869288959139701642811572472935106010037711084868823
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues32.321.125.837.422.122.216.424.416.316.820.814.824.916.616.224.526.921.717.628.325.317.919.021.220.732.020.713.710.521.824.926.317.527.923.120.8

us-gaap:NetCashProvidedByUsedInOperatingActivities dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312016-03-312015-03-31
Value30743781213817951644229115651378208110111023
Percentage of NetCashProvidedByUsedInOperatingActivities120.8106.7107.7104.8115.0103.9112.9104.2131.599.195.2
Percentage of Revenues31.240.023.823.318.825.318.417.527.314.723.3
Percentage of Revenues cb:OtherAceLimitedSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetCashProvidedByUsedInOperatingActivities us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value637-56.0-159.0-148.01808-184.01465-163.0-47.0
Percentage of NetCashProvidedByUsedInOperatingActivities25.0-1.6-8.0-8.6126.5-8.3105.7-12.3-3.0
Percentage of Revenues6.5-0.6-1.8-1.920.7-2.017.2-2.1-0.6
Percentage of Revenues srt:GuarantorSubsidiaries0.00.00.00.00.00.00.00.00.0

srt:ParentCompany


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value95379911665-9.0981630719
Percentage of NetCashProvidedByUsedInOperatingActivities37.522.55.83.8-0.64.41.223.21.2
Percentage of Revenues9.78.41.30.8-0.11.10.23.90.2
Percentage of Revenues srt:ParentCompany0.00.00.00.00.00.00.00.00.0

us-gaap:NetCashProvidedByUsedInOperatingActivities us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value-2120.0-980.0-110.00.0-2014.00.0-1660.0-200.0-470.0
Percentage of NetCashProvidedByUsedInOperatingActivities-83.3-27.7-5.50.0-140.90.0-119.8-15.1-29.7
Percentage of Revenues-21.5-10.4-1.20.0-23.00.0-19.5-2.5-6.2
Percentage of Revenues srt:ConsolidationEliminations0.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-773.0-1252.0-792.0-4035.0-1684.0-1010.0-2344.0-1274.0-1614.0-673.0-808.0-1615.0-4869.0-405.00.0-1020.0-816.0-229.0-956.0-503.0-1303.0-763.0-910.0-1466.0-757.0-1432.0-635.0-615.0-506.0-631.0-1268.0-631.0-1513.0-1201.0-801.0-666.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-8.0-12.6-8.0-42.6-18.7-13.1-26.8-14.1-18.9-8.5-10.6-23.5-104.1-8.30.0-23.2-17.2-4.4-19.9-11.4-25.7-14.8-19.3-34.0-16.2-27.9-16.2-14.7-11.3-14.7-29.8-16.6-34.3-30.9-21.3-16.9

us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312016-03-312015-03-31
Value-1308.0-3509.0-1673.0-1870.0-1546.0-1254.0-1607.0-633.0-804.02549-1236.0
Percentage of NetCashProvidedByUsedInInvestingActivities165.287.099.3185.166.098.499.694.199.5-157.8121.2
Percentage of Revenues-13.3-37.1-18.6-24.3-17.7-13.9-18.8-8.0-10.537.1-28.2
Percentage of Revenues cb:OtherAceLimitedSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetCashProvidedByUsedInInvestingActivities us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value444-525.0-10.0860-798.0-20.0-7.0-150.0-54.0
Percentage of NetCashProvidedByUsedInInvestingActivities-56.113.00.6-85.134.01.60.422.36.7
Percentage of Revenues4.5-5.5-0.111.2-9.1-0.2-0.1-1.9-0.7
Percentage of Revenues srt:GuarantorSubsidiaries0.00.00.00.00.00.00.00.00.0

srt:ParentCompany


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value0.0-1.0-1.0-1200.00.0-400.0-600.00.0-350.0
Percentage of NetCashProvidedByUsedInInvestingActivities-0.00.00.1118.8-0.031.437.2-0.043.3
Percentage of Revenues0.0-0.0-0.0-15.60.0-4.4-7.00.0-4.6
Percentage of Revenues srt:ParentCompany0.00.00.00.00.00.00.00.00.0

us-gaap:NetCashProvidedByUsedInInvestingActivities us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value720.00.012000.0400600110400
Percentage of NetCashProvidedByUsedInInvestingActivities-9.1-0.0-0.0-118.8-0.0-31.4-37.2-16.3-49.5
Percentage of Revenues0.70.00.015.60.04.47.01.45.2
Percentage of Revenues srt:ConsolidationEliminations0.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-2210.0-812.0-1848.0664-253.0-645.0973-693.0199-630.0-567.0-102.04472-118.0-992.0333-537.0-615.0-153.0-472.0-161.0-106.0-155.0813-279.0-148.0-262.0139-87.0-363.0-78.0-37.01014-91.0-98.0-93.0
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-22.9-8.1-18.87.0-2.8-8.411.1-7.72.3-8.0-7.4-1.595.6-2.4-19.77.6-11.3-11.8-3.2-10.7-3.2-2.0-3.318.9-6.0-2.9-6.73.3-1.9-8.5-1.8-1.023.0-2.3-2.6-2.4

us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312016-03-312015-03-31
Value-1769.0-1079.0-31.01256-1713.075-576.0-426.0-664.0-3910.0-243.0
Percentage of NetCashProvidedByUsedInFinancingActivities95.7-162.512.3-194.7-176.1-10.8-289.467.6117.13833.3-73.0
Percentage of Revenues-18.0-11.4-0.316.3-19.60.8-6.8-5.4-8.7-56.9-5.5
Percentage of Revenues cb:OtherAceLimitedSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value-1079.0585120-1105.0-568.0202-1528.0382102
Percentage of NetCashProvidedByUsedInFinancingActivities58.488.1-47.4171.3-58.4-29.1-767.8-60.6-18.0
Percentage of Revenues-11.06.21.3-14.4-6.52.2-17.94.91.3
Percentage of Revenues srt:GuarantorSubsidiaries0.00.00.00.00.00.00.00.00.0

srt:ParentCompany


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value-899.0-767.0-124.0114410.0303578-306.0331
Percentage of NetCashProvidedByUsedInFinancingActivities48.6-115.549.0-177.41.0-43.7290.548.6-58.4
Percentage of Revenues-9.1-8.1-1.414.90.13.36.8-3.94.3
Percentage of Revenues srt:ParentCompany0.00.00.00.00.00.00.00.00.0

us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value18991925-218.0-1940.03244-1273.01725-280.0-336.0
Percentage of NetCashProvidedByUsedInFinancingActivities-102.8289.986.2300.8333.4183.7866.844.459.3
Percentage of Revenues19.320.3-2.4-25.237.1-14.120.2-3.6-4.4
Percentage of Revenues srt:ConsolidationEliminations0.00.00.00.00.00.00.00.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1575.0-37.0164511257221-25.05318356-1012.01262-342.0-226.025972
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues1.60.1-0.41.70.60.20.72.4-0.30.72.40.6-11.916.1-4.3-2.63.21.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value58-811.04371137-1615.01094-619.0353587-937.0691686-317.0-166.0-980.0357
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect-156.8-494.5856.99475.0-2833.3495.02476.0666.0320.8-1673.2-68.354.492.773.5-378.4495.8
Percentage of Revenues0.6-8.64.914.8-18.512.1-7.34.57.7-10.78.18.8-4.0-1.9-12.14.8
Percentage of Revenues cb:OtherAceLimitedSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value1.00.0-49.0-393.0442-1.0-70.0691.00.0-863.08631.0
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect-2.70.0-96.1-3275.0775.4-0.5280.0130.20.50.085.368.4-0.3
Percentage of Revenues0.00.0-0.5-5.15.1-0.0-0.80.90.00.0-10.111.00.0
Percentage of Revenues srt:GuarantorSubsidiaries0.00.00.00.00.00.00.00.00.00.00.00.00.0

srt:ParentCompany


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value5330-9.08.00.01.0-1.01.01.0-1.00.0-2.02.0
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect-143.218.3-17.666.70.00.54.01.90.5-1.8-0.0-0.2-0.6
Percentage of Revenues0.50.3-0.10.10.00.0-0.00.00.0-0.00.0-0.00.0
Percentage of Revenues srt:ParentCompany0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value-149.0945-328.0-740.01230-873.0665-370.0-406.0994-840.0-285.0-28.0
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect402.7576.2-643.1-6166.72157.9-395.0-2660.0-698.1-221.91775.083.0-22.68.2
Percentage of Revenues-1.510.0-3.7-9.614.1-9.77.8-4.7-5.311.4-9.9-3.6-0.3
Percentage of Revenues srt:ConsolidationEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.0

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1151196-502.0740162-140.0-464.015368205-354.0579142-16.0-267.095228-238.0-560.096466-289.0-530.0194-54.077-386.01595721-475.0-115.028494-471.0178-97.055126-234.0-83.0-159.0145160-331.0-146.0
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3122210525443544198517121429220513861322158310201165808816107512741126846125012869288959139701642811572472935106010037711084868823
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues32.321.125.837.422.122.216.424.416.316.820.814.824.916.616.224.526.921.717.628.325.317.919.021.220.732.020.713.710.521.824.926.317.527.923.120.8

us-gaap:NetCashProvidedByUsedInOperatingActivities dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312016-03-312015-03-31
Value30743781213817951644229115651378208110111023
Percentage of NetCashProvidedByUsedInOperatingActivities120.8106.7107.7104.8115.0103.9112.9104.2131.599.195.2
Percentage of Revenues31.240.023.823.318.825.318.417.527.314.723.3
Percentage of Revenues cb:OtherAceLimitedSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetCashProvidedByUsedInOperatingActivities us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value637-56.0-159.0-148.01808-184.01465-163.0-47.0
Percentage of NetCashProvidedByUsedInOperatingActivities25.0-1.6-8.0-8.6126.5-8.3105.7-12.3-3.0
Percentage of Revenues6.5-0.6-1.8-1.920.7-2.017.2-2.1-0.6
Percentage of Revenues srt:GuarantorSubsidiaries0.00.00.00.00.00.00.00.00.0

srt:ParentCompany


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value95379911665-9.0981630719
Percentage of NetCashProvidedByUsedInOperatingActivities37.522.55.83.8-0.64.41.223.21.2
Percentage of Revenues9.78.41.30.8-0.11.10.23.90.2
Percentage of Revenues srt:ParentCompany0.00.00.00.00.00.00.00.00.0

us-gaap:NetCashProvidedByUsedInOperatingActivities us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value-2120.0-980.0-110.00.0-2014.00.0-1660.0-200.0-470.0
Percentage of NetCashProvidedByUsedInOperatingActivities-83.3-27.7-5.50.0-140.90.0-119.8-15.1-29.7
Percentage of Revenues-21.5-10.4-1.20.0-23.00.0-19.5-2.5-6.2
Percentage of Revenues srt:ConsolidationEliminations0.00.00.00.00.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value2265230024181194-331.025211731091115010403551231129410821533-70.01305109316101360726439683528942681555785779734998916891953765640328973750-31.06072591001675677755953494535567
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues23.423.124.612.6-3.73.313.412.113.513.24.714.115.213.819.1-0.816.114.619.715.99.26.414.610.818.715.511.715.116.216.619.717.718.922.116.312.58.423.216.7-0.714.36.822.717.418.019.122.313.415.115.9

us-gaap:NetIncomeLoss dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Net
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1415-127.026411181262114012581358122323138712241423867619505538948693
Percentage of NetIncomeLoss118.538.4104.8102.5109.7109.6102.2104.9113.0-32.9106.3112.0104.6119.4141.073.9101.9100.6101.8
Percentage of Revenues15.0-1.43.412.414.814.514.416.015.60.317.116.316.711.09.010.811.018.815.8
Percentage of Revenues cb:OtherAceLimitedSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Net
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value2.0275-510.058575960460962833768462
Percentage of NetIncomeLoss0.123.0154.1232.169.652.558.651.026.063.2-88.6
Percentage of Revenues0.02.9-5.77.68.47.17.77.24.08.70.7
Percentage of Revenues srt:GuarantorSubsidiaries0.00.00.00.00.00.00.00.00.00.00.0

srt:ParentCompany


Net
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value2824181194-331.025211731091115010403551231129410821533-70.0
Percentage of NetIncomeLoss1.2100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.324.612.6-3.73.313.412.113.513.24.714.115.213.819.1-0.8
Percentage of Revenues srt:ParentCompany0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-3607.0-1690.0637-849.0-1837.0-1877.0-1866.0-1749.0-843.0-1886.0-1695.0-1907.0-2333.0-85.0
Percentage of NetIncomeLoss-149.2-141.5-192.4-336.9-156.6-172.0-162.3-168.2-237.5-153.2-131.0-176.2-152.2121.4
Percentage of Revenues-36.6-17.97.1-11.0-21.0-20.8-21.9-22.2-11.1-21.6-19.9-24.4-29.1-1.0
Percentage of Revenues srt:ConsolidationEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementBusinessSegments

us-gaap:Corporate


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-9.0697-196.0-571.0-1479.0-685.0-555.0-605.0-384.0-520.0-475.0-305.0-413.0-545.0
Percentage of NetIncomeLoss-0.430.3-16.4172.5-586.9-62.8-48.3-58.2-31.2-40.2-43.9435.7-31.6-49.9
Percentage of Revenues-0.17.0-2.1-6.4-19.2-7.6-6.5-7.7-4.4-6.1-6.1-3.5-5.1-7.3
Percentage of Revenues us-gaap:Corporate0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2265230024181194-331.025211731091115010403551231129410821533-70.01305109316101360726439683528942681555785779734998916891953765640328973750-31.06072591001675677755
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues23.423.124.612.6-3.73.313.412.113.513.24.714.115.213.819.1-0.816.114.619.715.99.26.414.610.818.715.511.715.116.216.619.717.718.922.116.312.58.423.216.7-0.714.36.822.717.418.019.1
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-773.0-1252.0-792.0-4035.0-1684.0-1010.0-2344.0-1274.0-1614.0-673.0-808.0-1615.0-4869.0-405.00.0-1020.0-816.0-229.0-956.0-503.0-1303.0-763.0-910.0-1466.0-757.0-1432.0-635.0-615.0-506.0-631.0-1268.0-631.0-1513.0-1201.0-801.0-666.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-8.0-12.6-8.0-42.6-18.7-13.1-26.8-14.1-18.9-8.5-10.6-23.5-104.1-8.30.0-23.2-17.2-4.4-19.9-11.4-25.7-14.8-19.3-34.0-16.2-27.9-16.2-14.7-11.3-14.7-29.8-16.6-34.3-30.9-21.3-16.9

us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312016-03-312015-03-31
Value-1308.0-3509.0-1673.0-1870.0-1546.0-1254.0-1607.0-633.0-804.02549-1236.0
Percentage of NetCashProvidedByUsedInInvestingActivities165.287.099.3185.166.098.499.694.199.5-157.8121.2
Percentage of Revenues-13.3-37.1-18.6-24.3-17.7-13.9-18.8-8.0-10.537.1-28.2
Percentage of Revenues cb:OtherAceLimitedSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetCashProvidedByUsedInInvestingActivities us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value444-525.0-10.0860-798.0-20.0-7.0-150.0-54.0
Percentage of NetCashProvidedByUsedInInvestingActivities-56.113.00.6-85.134.01.60.422.36.7
Percentage of Revenues4.5-5.5-0.111.2-9.1-0.2-0.1-1.9-0.7
Percentage of Revenues srt:GuarantorSubsidiaries0.00.00.00.00.00.00.00.00.0

srt:ParentCompany


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value0.0-1.0-1.0-1200.00.0-400.0-600.00.0-350.0
Percentage of NetCashProvidedByUsedInInvestingActivities-0.00.00.1118.8-0.031.437.2-0.043.3
Percentage of Revenues0.0-0.0-0.0-15.60.0-4.4-7.00.0-4.6
Percentage of Revenues srt:ParentCompany0.00.00.00.00.00.00.00.00.0

us-gaap:NetCashProvidedByUsedInInvestingActivities us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value720.00.012000.0400600110400
Percentage of NetCashProvidedByUsedInInvestingActivities-9.1-0.0-0.0-118.8-0.0-31.4-37.2-16.3-49.5
Percentage of Revenues0.70.00.015.60.04.47.01.45.2
Percentage of Revenues srt:ConsolidationEliminations0.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-2210.0-812.0-1848.0664-253.0-645.0973-693.0199-630.0-567.0-102.04472-118.0-992.0333-537.0-615.0-153.0-472.0-161.0-106.0-155.0813-279.0-148.0-262.0139-87.0-363.0-78.0-37.01014-91.0-98.0-93.0
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-22.9-8.1-18.87.0-2.8-8.411.1-7.72.3-8.0-7.4-1.595.6-2.4-19.77.6-11.3-11.8-3.2-10.7-3.2-2.0-3.318.9-6.0-2.9-6.73.3-1.9-8.5-1.8-1.023.0-2.3-2.6-2.4

us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312016-03-312015-03-31
Value-1769.0-1079.0-31.01256-1713.075-576.0-426.0-664.0-3910.0-243.0
Percentage of NetCashProvidedByUsedInFinancingActivities95.7-162.512.3-194.7-176.1-10.8-289.467.6117.13833.3-73.0
Percentage of Revenues-18.0-11.4-0.316.3-19.60.8-6.8-5.4-8.7-56.9-5.5
Percentage of Revenues cb:OtherAceLimitedSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value-1079.0585120-1105.0-568.0202-1528.0382102
Percentage of NetCashProvidedByUsedInFinancingActivities58.488.1-47.4171.3-58.4-29.1-767.8-60.6-18.0
Percentage of Revenues-11.06.21.3-14.4-6.52.2-17.94.91.3
Percentage of Revenues srt:GuarantorSubsidiaries0.00.00.00.00.00.00.00.00.0

srt:ParentCompany


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value-899.0-767.0-124.0114410.0303578-306.0331
Percentage of NetCashProvidedByUsedInFinancingActivities48.6-115.549.0-177.41.0-43.7290.548.6-58.4
Percentage of Revenues-9.1-8.1-1.414.90.13.36.8-3.94.3
Percentage of Revenues srt:ParentCompany0.00.00.00.00.00.00.00.00.0

us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value18991925-218.0-1940.03244-1273.01725-280.0-336.0
Percentage of NetCashProvidedByUsedInFinancingActivities-102.8289.986.2300.8333.4183.7866.844.459.3
Percentage of Revenues19.320.3-2.4-25.237.1-14.120.2-3.6-4.4
Percentage of Revenues srt:ConsolidationEliminations0.00.00.00.00.00.00.00.00.0

Proceeds From Issuance Of Long Term Debt

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:ProceedsFromIssuanceOfLongTermDebt


Proceeds
Period End2020-12-312020-09-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value0.09881542-3.012890.00.00.0-4.021750.00.00.00.00.00.00.052900.00.08000.00.06990.00.00.00.09470.00.00.0
Percentage of ProceedsFromIssuanceOfLongTermDebt0.0100.0100.0100.0100.00.00.00.0100.0100.00.00.00.00.00.00.00.0100.00.00.0100.00.00.0100.00.00.00.00.0100.00.00.00.0

us-gaap:ProceedsFromIssuanceOfLongTermDebt us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Proceeds
Period End2020-12-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-31
Value0.01542-3.00.00.0-4.02175
Percentage of ProceedsFromIssuanceOfLongTermDebt0.0100.0100.00.00.0100.0100.0

Payments Of Dividends Common Stock

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsOfDividendsCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3513523533573393393403433353363363403313303303323223243223213122182182172132142162182142141741741672.0331166159159117119111112112113105105
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsOfDividendsCommonStock us-gaap:ConsolidatedEntities

srt:ParentCompany


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value353357339339340343335336336340331330330
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value19215191900.010.032332746237436731238531829942323471280.00.00.00.08.04033474224502223355421581540.00.00.011271000.068
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.00.0100.0

us-gaap:PaymentsForRepurchaseOfCommonStock us-gaap:ConsolidatedEntities

srt:ParentCompany


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value1900.010.03233270.00.00.00.00.00.00.00.0
Percentage of PaymentsForRepurchaseOfCommonStock100.00.0100.0100.0100.00.00.00.00.00.00.00.00.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value11101110109.8534969.6239869.4968569.4496591011119.92356311
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value125.09116.79108.2599.287.2978.469.0661.8455.0349.7846.845.4646.2442.12
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312016-03-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value89280430469998811421886199917751887168214471055
Percentage of DeferredTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value606276504714131716232726134139155150
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value8311479997838176456
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0

cb:AdvancesToFromAffiliatesFinancingActivities dei:LegalEntity

cb:AdvancesToFromAffiliatesFinancingActivities

cb:OtherAceLimitedSubsidiariesAndEliminations


Advances
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-283.012917-36.0-203.0-22.0-739.042363-33.0-116.05616.023-1.0-63.0-129.0-13.0-14.0-12.011-153.013-4.0
Percentage of AdvancesToFromAffiliatesFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cb:AdvancesToFromAffiliatesFinancingActivities us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Advances
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value-73.034366110215082171806-308.043479242395269
Percentage of AdvancesToFromAffiliatesFinancingActivities25.8265.9388.2-3061.1-742.9-986.4-244.4-733.3119.6-2400.0-364.716.94483.3

srt:ParentCompany


Advances
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value356-472.0-83.0-1066.0-1305.0-195.0-1067.0266-797.0-759.0-307.0-656.0-275.0
Percentage of AdvancesToFromAffiliatesFinancingActivities-125.8-365.9-488.22961.1642.9886.4144.4633.3-219.62300.0264.7-116.9-4583.3

cb:DebtSecuritiesAvailableForSaleCreditImpairmentChargesIntenttoSell

cb:DebtSecuritiesAvailableForSaleCreditImpairmentChargesIntenttoSell


Debt
Period End2020-09-302020-06-302020-03-312019-06-302019-03-31
Value11311210.00.0
Percentage of DebtSecuritiesAvailableForSaleCreditImpairmentChargesIntenttoSell100.0100.0100.00.00.0

cb:DebtSecuritiesAvailableForSaleCreditImpairmentChargesIntenttoSell us-gaap:InvestmentType

us-gaap:FixedMaturities


Debt
Period End2021-06-302020-06-302020-03-31
Value1.031121
Percentage of DebtSecuritiesAvailableForSaleCreditImpairmentChargesIntenttoSell0.0100.0100.0

cb:EquityInEarningsOfSubsidiaries us-gaap:ConsolidatedEntities

cb:EquityInEarningsOfSubsidiaries

srt:GuarantorSubsidiaries


Equity
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value1031516-271.0593824762759709454885
Percentage of EquityInEarningsOfSubsidiaries100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:ParentCompany


Equity
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value227223931174-366.0256116010531104990313117712411022
Percentage of EquityInEarningsOfSubsidiaries220.40.0227.5135.143.20.0127.8144.9130.40.0166.0273.3115.5

cb:EquityInEarningsOfSubsidiaries us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Equity
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-3607.0-1690.0637-849.0-1837.0-1877.0-1866.0-1749.0-843.0-1886.0-1695.0-1907.0
Percentage of EquityInEarningsOfSubsidiaries0.0-327.5-235.1-143.20.0-227.8-244.9-230.40.0-266.0-373.3-215.5

cb:Equitymethodinvestmentadditional15.3ownershippercentageobtained dei:LegalEntity, us-gaap:StatementGeographical, us-gaap:SubsequentEventType

cb:Equitymethodinvestmentadditional15.3ownershippercentageobtained

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


Equitymethodinvestmentadditional15.3ownershippercentageobtaineddei:
Period End2020-07-13
Value0.153
Percentage of Equitymethodinvestmentadditional15.3ownershippercentageobtained100.0

cb:FundingDividendsDeclaredFromAdditionalPaidInCapital us-gaap:StatementEquityComponents

cb:FundingDividendsDeclaredFromAdditionalPaidInCapital

us-gaap:RetainedEarnings


Funding
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-352.0-352.02444-353.0-353.03402380-341.0-344.0-335.02352-337.0-339.0-332.02304-331.0-332.0-324.02244-323.0-323.0-314.01088-218.0-217.00.0
Percentage of FundingDividendsDeclaredFromAdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

cb:FundingDividendsDeclaredToRetainedEarnings us-gaap:StatementEquityComponents

cb:FundingDividendsDeclaredToRetainedEarnings

us-gaap:AdditionalPaidInCapital


Funding
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-31
Value-352000000.0-352000000.0-352000000.0-353000000.0-353000000.0-340000000.0-340000000.0-341000000.0-344000000.0-335000000.0-336000000.0-337000000.0-339000000.0-332000000.0-330000000.0-331000000.0-332000000.0-324000000.0-324000000.0-323000000.0-323000000.0-314000000.0-218000000.0-217000000.00
Percentage of FundingDividendsDeclaredToRetainedEarnings100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

cb:GainsLossesOnFairValueChangesInSeparateAccountAssets

cb:GainsLossesOnFairValueChangesInSeparateAccountAssets


Gains
Period End2021-06-302020-06-302016-03-312015-03-31
Value15403.0-11.0
Percentage of GainsLossesOnFairValueChangesInSeparateAccountAssets100.0100.0100.0100.0

cb:LiabilityforUnpaidClaimsandClaimsAdjustmentExpensePeriodIncreaseDecreaseGross

cb:LiabilityforUnpaidClaimsandClaimsAdjustmentExpensePeriodIncreaseDecreaseGross


Liabilityfor
Period End2021-06-302021-03-31
Value10341444
Percentage of LiabilityforUnpaidClaimsandClaimsAdjustmentExpensePeriodIncreaseDecreaseGross100.0100.0

cb:NetPriorPeriodDevelopment

cb:NetPriorPeriodDevelopment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-268.0-192.0-206.0-146.075-118.0-233.0-167.0-188.0-204.0-253.0-243.0-191.0-209.0
Percentage of NetPriorPeriodDevelopment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cb:NetProceedsFromPaymentsToAffiliatedNotionalCashPoolingProgram us-gaap:ConsolidatedEntities

cb:NetProceedsFromPaymentsToAffiliatedNotionalCashPoolingProgram

srt:GuarantorSubsidiaries


Net
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value63-186.00.0-422.0511-74.0756-837.0115
Percentage of NetProceedsFromPaymentsToAffiliatedNotionalCashPoolingProgram100.0100.00.0100.0100.0100.0100.0100.0100.0

cb:NetProceedsFromPaymentsToAffiliatedNotionalCashPoolingProgram us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Net
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-945.0328740873-665.0370-994.0840285
Percentage of NetProceedsFromPaymentsToAffiliatedNotionalCashPoolingProgram-1500.0-176.30.0-206.9-130.1-500.0-131.5-100.4247.8

cb:NetRealizedGainsLosses

cb:NetRealizedGainsLosses


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312016-06-302016-03-312015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-33.0887-141.030-958.0-55.0-155.0-223.0-97.0-687.01918-2.0-216.0-394.0126-89.0-60.0-397.0126-89.0-210.0-120.0-73.0-104.0
Percentage of NetRealizedGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cb:NetrealizedgainslossesexcludingOTTI

cb:NetrealizedgainslossesexcludingOTTI


Netrealizedgainslossesexcluding
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value571-141.00.00.0-47.0-131.0-210.0-84.0-654.03022
Percentage of NetrealizedgainslossesexcludingOTTI100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0

cb:PaymentIncludingDepositForHuataiGroupInterest

cb:PaymentIncludingDepositForHuataiGroupInterest


Payment
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.0650.01550
Percentage of PaymentIncludingDepositForHuataiGroupInterest0.0100.00.0100.0

cb:PaymentOfContributionsToSubsidiary us-gaap:ConsolidatedEntities

cb:PaymentOfContributionsToSubsidiary

srt:ParentCompany


Payment
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.00.00.012000.04006000.03503750.0750
Percentage of PaymentOfContributionsToSubsidiary0.00.00.0100.00.0100.0100.00.0100.0100.00.0100.0

cb:PaymentOfContributionsToSubsidiary us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Payment
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-72.00.00.0-1200.00.0-400.0-600.0-110.0-400.0-375.00.0-4250.0
Percentage of PaymentOfContributionsToSubsidiary0.00.00.0-100.00.0-100.0-100.00.0-114.3-100.00.0-566.7

cb:PolicyAcquisitionCostsAndAdministrativeExpenses

cb:PolicyAcquisitionCostsAndAdministrativeExpenses


Policy
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value247223782320235623522355230221742208222322112156218422022155207321252286238921851306133913051261
Percentage of PolicyAcquisitionCostsAndAdministrativeExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cb:PolicyAcquisitionCostsAndAdministrativeExpenses dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Policy
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2390232923702338228521692290216921162166213920412259227721321282131712801241
Percentage of PolicyAcquisitionCostsAndAdministrativeExpenses100.5100.4100.699.399.399.8103.098.198.198.499.398.598.895.397.698.298.498.198.4

cb:PolicyAcquisitionCostsAndAdministrativeExpenses us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Policy
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-33.0-30.0-38.0-5.0-5.0-15.0-90.0192216
Percentage of PolicyAcquisitionCostsAndAdministrativeExpenses-1.4-1.3-1.6-0.2-0.2-0.7-4.00.91.00.7

srt:ParentCompany


Policy
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value2821212428222220232323181920
Percentage of PolicyAcquisitionCostsAndAdministrativeExpenses1.10.90.91.01.20.91.00.91.01.01.00.80.90.9

cb:Portiononeofpaymentstoacquire22.4ofHuataiGroup dei:LegalEntity, us-gaap:StatementGeographical

cb:Portiononeofpaymentstoacquire22.4ofHuataiGroup

cb:HuataiGroup, country:CN


Portiononeofpaymentstoacquire22.4of
Period End2020-09-30
Value1100
Percentage of Portiononeofpaymentstoacquire22.4ofHuataiGroup100.0

cb:PriorPeriodDevelopmentnetadjustments

cb:PriorPeriodDevelopmentnetadjustments


Prior
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value234.0-4.0174.02.0-7.041-5.024-1.049
Percentage of PriorPeriodDevelopmentnetadjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cb:ProceedsFromSaleOfAvailableForSaleSecuritiesDebtCondensed

cb:ProceedsFromSaleOfAvailableForSaleSecuritiesDebtCondensed


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1840180330474687268025984545329342962562404023423478339528141995553963295581159116402002
Percentage of ProceedsFromSaleOfAvailableForSaleSecuritiesDebtCondensed100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cb:ProceedsFromSaleOfAvailableForSaleSecuritiesDebtCondensed dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1840180130404687268025974545329342962562404022433478339528141929553963295581159116402002
Percentage of ProceedsFromSaleOfAvailableForSaleSecuritiesDebtCondensed100.099.999.8100.0100.0100.0100.0100.0100.0100.0100.095.8100.0100.0100.096.7100.0100.0100.0100.0100.0100.0

cb:ProceedsFromSaleOfAvailableForSaleSecuritiesDebtCondensed us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.02.07.00.00.01.00.00.0
Percentage of ProceedsFromSaleOfAvailableForSaleSecuritiesDebtCondensed0.00.10.20.00.00.00.00.0

cb:ReinsuranceRecoverableAllowanceForCreditLossOther

cb:ReinsuranceRecoverableAllowanceForCreditLossOther


Reinsurance
Period End2020-12-312020-09-30
Value01000000.0
Percentage of ReinsuranceRecoverableAllowanceForCreditLossOther0.0100.0

cb:SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss

cb:SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2737187323071607-295.015571545161617251468137415751674138613845516231493178918041353128692711341085953
Percentage of SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cb:SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-3.01.0-3.0-1.01.02.00.014
Percentage of SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss-0.10.1-0.1-0.1-0.30.10.00.9

cb:SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss us-gaap:StatementBusinessSegments

cb:SegmentGlobalReinsurance


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value106779353981138110190104-48.097106122
Percentage of SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss3.94.14.03.3-33.27.35.26.25.27.1-3.56.26.38.8

cb:SegmentInsuranceNorthAmericanAgriculture


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value5110.036653218-22.0162777166873310018989239218785215857752853
Percentage of SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss1.90.51.64.0-10.81.2-1.41.01.65.212.15.52.07.213.7161.81.46.210.54.71.64.56.16.62.65.6

cb:SegmentInsuranceNorthAmericanCommercialPCMemberMember


Segment
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-31
Value1164884783-120.09639529779289331015927212952937900810827464479442
Percentage of SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss42.547.248.740.761.858.956.663.259.260.666.9385.558.762.849.959.964.340.944.146.4

cb:SegmentInsuranceNorthAmericanPersonalPCMember


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value3021192021819426565263173159126571878.0-29.0-180.016422217421616473471987-10.0
Percentage of SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss11.06.48.81.1-65.817.04.216.310.010.89.23.611.20.6-2.1-327.310.114.99.712.012.15.75.11.78.0-1.0

cb:SegmentInsuranceOverseasGeneral


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value549409310367-51.0278290349342292306363396336460131396229330530342314314416321316
Percentage of SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss20.121.813.422.817.317.918.821.619.819.922.323.023.724.233.2238.224.415.318.429.425.324.433.936.729.633.2

cb:SegmentLife


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value10210411610487949095968589787764706452626069746759657866
Percentage of SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss3.75.65.06.5-29.56.05.85.95.65.86.55.04.64.65.1116.43.24.23.43.85.55.26.45.77.26.9

us-gaap:Corporate


Segment
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value466269218-535.0-174.0-160.020-177.0-40.0-140.0-171.0-180.0-95.0-145.0
Percentage of SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss17.014.413.6181.4-11.2-9.91.2-12.1-2.5-8.4-12.3-327.3-5.9-9.7

cb:SignificantUnobservableInputsAnnuitizationRate us-gaap:Range

cb:SignificantUnobservableInputsAnnuitizationRate

srt:WeightedAverage


Significant
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-0.13.4-0.43.959-0.0050.046
Percentage of SignificantUnobservableInputsAnnuitizationRate100.0100.0100.0100.0100.0100.0

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments


Accretion
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-30
Value-71000000.0-76000000.0-88000000.0-105000000.0-87000000.0-85000000.0-91000000.0-118000000.0-143000000.0-156000000.0-155000000.0-173000000.0-169000000.0-184000000.0-182000000.0-202000000.0-174000000.0-44000000.0
Percentage of AccretionAmortizationOfDiscountsAndPremiumsInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdditionsToContractHoldersFunds

us-gaap:AdditionsToContractHoldersFunds


Additions
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value13513314810780135138139122115184777411813010310010949199156118152116134101177647451
Percentage of AdditionsToContractHoldersFunds100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdditionsToContractHoldersFunds dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Additions
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value14810780135138139122115184777411813010310010949199156118152116134101
Percentage of AdditionsToContractHoldersFunds100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashDividendsPaidToParentCompany dei:LegalEntity

us-gaap:CashDividendsPaidToParentCompany

cb:OtherAceLimitedSubsidiariesAndEliminations


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value-2120.0-980.0-110.00.0-2014.00.0-1660.0-200.0-470.0-1763.0-75.0-3000.0-483.00.0-1545.0-496.0-795.00.0-1000.0-6372.0-3503.0
Percentage of CashDividendsPaidToParentCompany100.0100.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0

us-gaap:CashDividendsPaidToParentCompany us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value21209801100.020140.016602004701763753000483
Percentage of CashDividendsPaidToParentCompany-100.0-100.0-100.00.0-100.00.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0

us-gaap:CommonStockDividendsPerShareDeclared us-gaap:Currency

us-gaap:CommonStockDividendsPerShareDeclared

currency:CHF


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.710.70.710.710.750.720.740.730.750.720.730.720.730.66
Percentage of CommonStockDividendsPerShareDeclared100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

currency:USD


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.80.780.780.780.780.750.750.750.750.730.730.730.730.71
Percentage of CommonStockDividendsPerShareDeclared112.7111.4109.9109.9104.0104.2101.4102.7100.0101.4100.0101.4100.0107.6

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease


Debt
Period End2020-12-312020-09-302020-06-302020-03-31
Value5.05.029149
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease us-gaap:AdjustmentsForNewAccountingPronouncements

us-gaap:AccountingStandardsUpdate201613


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value1.04.01542104-150.00.00.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease0.00.0300.0840.0358.6-100.70.00.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease us-gaap:InvestmentType

us-gaap:FixedMaturities


Debt
Period End2021-06-302021-03-312020-06-302020-03-31
Value10.06.0104-150.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease0.00.0358.6-100.7

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease


Debt
Period End2020-12-312020-09-302020-06-302020-03-31
Value003000000.02000000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease0.00.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossRecovery

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossRecovery


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value-5000000.0-9000000.0-19000000.0-40000000.0-134000000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossRecovery100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossWriteoff

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossWriteoff


Debt
Period End2020-12-312020-09-302020-06-30
Value00-5000000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossWriteoff0.00.0100.0

us-gaap:DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate

us-gaap:DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate


Debt
Period End2020-12-31
Value0
Percentage of DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate0.0

us-gaap:DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAmountAtParValue

us-gaap:DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAmountAtParValue


Debt
Period End2020-12-31
Value0.0
Percentage of DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAmountAtParValue0.0

us-gaap:DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAmountAtPurchasePrice

us-gaap:DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAmountAtPurchasePrice


Debt
Period End2020-12-31
Value0.0
Percentage of DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAmountAtPurchasePrice0.0

us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss

us-gaap:FixedMaturities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value12242249-33.0-319.012-11.012-44.0-160.0-38.0-81.0-23.0
Percentage of DebtSecuritiesAvailableForSaleRealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment

us-gaap:FixedMaturities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value56374950687750705627105649966
Percentage of DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleRealizedLossExcludingOtherThanTemporaryImpairment us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleRealizedLossExcludingOtherThanTemporaryImpairment

us-gaap:FixedMaturities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value53193532174125305731582329117688
Percentage of DebtSecuritiesAvailableForSaleRealizedLossExcludingOtherThanTemporaryImpairment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLossPeriodIncreaseDecrease

us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLossPeriodIncreaseDecrease


Debt
Period End2020-12-312020-09-302020-06-30
Value02000000.06000000.0
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLossPeriodIncreaseDecrease0.0100.0100.0

us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLossRecovery

us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLossRecovery


Debt
Period End2021-06-302021-03-312020-12-312020-09-30
Value-6000000.0-1000000.0-1000000.0-8000000.0
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLossRecovery100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-30
Value-1000000.0-1000000.0-1000000.00-1000000.0-1000000.0-1000000.0-1000000.00-1000000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses100.0100.0100.00.0100.0100.0100.0100.00.0100.0

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1000000.000000000
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.00.00.00.00.00.00.00.00.0

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-6000000.0-20000000.0-23000000.0-20000000.0-20000000.0-20000000.0-24000000.0-20000000.0-20000000.0-20000000.0-21000000.0-21000000.0-22000000.0-21000000.0-21000000.0-22000000.0-23000000.0-23000000.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit0.00.00.0-2000.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value636456565656474748475353
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value11119.0111110.0121111111212
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets17.517.216.119.619.617.925.523.422.923.422.622.6

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value2.01.01.01.01.01.01.01.01.02.01.01.01.02.01.01.01.03.0
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets3.61.81.81.82.12.12.12.11.93.80.00.00.00.00.00.00.00.0

us-gaap:DefinedBenefitPlanInterestCost us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanInterestCost

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value171825242525293029302626
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value4.05.05.06.05.06.07.06.07.07.07.06.0
Percentage of DefinedBenefitPlanInterestCost23.527.820.025.020.024.024.120.024.123.326.923.1

us-gaap:DefinedBenefitPlanInterestCost us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value0.01.00.01.01.01.01.01.00.01.01.01.01.02.00.01.04.04.0
Percentage of DefinedBenefitPlanInterestCost0.04.20.04.03.43.33.43.30.03.80.00.00.00.00.00.00.00.0

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-46.0-46.0-31.0-31.0-30.0-30.0-5.0-4.0-6.0-5.0-12.0-13.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-5.0-4.0-4.0-3.0-4.0-3.0-1.0-1.0-1.0-1.01.0-2.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost10.98.712.99.713.310.020.025.016.720.0-8.315.4

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-6.0-20.0-24.0-20.0-21.0-20.0-24.0-20.0-20.0-20.0-22.0-22.0-23.0-21.0-26.0-54.0-22.0-23.0-12.05.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost13.043.577.464.570.066.7480.0500.0333.3400.0183.3169.20.00.00.00.00.00.00.00.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-30
Value-51.0-50.0-35.0-34.0-34.0-33.0-6.0-5.0-7.0-6.0-11.0-15.0-13.0-16.0-24.0-3.0-117.03.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost110.9108.7112.9109.7113.3110.0120.0125.0116.7120.091.7115.40.00.00.00.00.00.0

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.000-1000000.00
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements10.0100.0100.0100.0100.0100.00.00.0100.00.0

us-gaap:DefinedBenefitPlanServiceCost us-gaap:IncomeStatementLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanServiceCost

us-gaap:GeneralAndAdministrativeExpense, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.01.01.01.01.01.01413141315151715
Percentage of DefinedBenefitPlanServiceCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanServiceCost us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1.01.01.01.01.01.03.03.02.03.03.03.0
Percentage of DefinedBenefitPlanServiceCost100.0100.0100.0100.0100.0100.021.423.114.323.120.020.0

us-gaap:DefinedBenefitPlanServiceCost us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-30
Value1.01.01.01.01.01.0151515151717181719212126
Percentage of DefinedBenefitPlanServiceCost100.0100.0100.0100.0100.0100.0107.1115.4107.1115.4113.3113.3105.9113.30.00.00.00.0

us-gaap:DerivativeGainLossOnDerivativeNet

us-gaap:DerivativeGainLossOnDerivativeNet


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value-160.03831924.0123-547.0-23.0-223.0-259.0-80.0-421.0-17.0297919-22.0632731648-206.0-284.079-344.0128-56.0-209.0-63.0-76.0-94.0165427296135-60.0
Percentage of DerivativeGainLossOnDerivativeNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeGainLossOnDerivativeNet us-gaap:DerivativeInstrumentRisk

cb:GuaranteedLivingBenefitAndOtherDerivativeInstruments


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-69.0274149-5.0109-562.04.0-126.0-78.050-268.0-54.05.0626.0-8.0792126447-159.0-245.053-322.0101
Percentage of DerivativeGainLossOnDerivativeNet43.171.577.6-125.088.6102.7-17.456.530.1-62.563.7317.617.278.531.636.4125.477.883.597.977.286.367.193.678.9

cb:InvestmentAndEmbeddedDerivativeInstruments


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-91.0109439.01415-27.0-97.0-181.0-130.0-153.037241713-14.0-16.06.0521.0-47.0-39.026-22.027
Percentage of DerivativeGainLossOnDerivativeNet56.928.522.4225.011.4-2.7117.443.569.9162.536.3-217.682.821.568.463.6-25.422.216.52.122.813.732.96.421.1

cb:OtherDerivatives


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value3.0-1.03.01.0-1.0-2.00.0-14.07.0-1.0-5.0-8.08.02.0-1.0-5.0-1.02.0-11.03.00.0-2.0-2.0-9.0-1.0
Percentage of DerivativeGainLossOnDerivativeNet-1.9-0.31.625.0-0.80.4-0.06.3-2.71.21.247.127.62.5-5.322.7-1.67.4-3.56.2-0.00.7-2.52.6-0.8

cb:OtherFuturesContractsAndOptions


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-86.0125319.03.0-27.0-5.0-22.0-25.0-36.0-8.01321134.0-8.0-9.0-8.0538.0-37.0-34.019-23.042
Percentage of DerivativeGainLossOnDerivativeNet53.832.616.1225.02.44.921.79.99.745.01.9-76.572.416.521.136.4-14.3-29.616.816.718.012.024.16.732.8

us-gaap:ConvertiblesAndBondsWithWarrantsAttached


Derivative
Period End2021-06-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value1.01.0-1.00.00.01.01.0-2.00.00.00.00.01.00.00.00.03.00.05.06.0-14.0-5.0
Percentage of DerivativeGainLossOnDerivativeNet-0.60.80.2-0.0-0.0-0.4-1.20.5-0.00.00.00.0-4.50.00.00.06.2-0.0-1.87.64.1-3.9

us-gaap:EquityContract


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-64.0-44.0-78.0-52.0-103.0125-49.0-6.0-20.0-63.0118-100.0-44.022-92.0-57.0-38.0-74.0-48.0-45.0-28.0-15.0
Percentage of DerivativeGainLossOnDerivativeNet40.0-11.5-40.6-1300.0-83.7-22.9213.02.77.778.8-28.0588.2-151.727.8-484.2259.1-60.3-274.1-15.2-93.813.65.3

us-gaap:ForeignExchangeContract


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-91.0109439.01415-27.0-97.0-181.0-130.0-153.037241713-14.0-16.06.0521.0-47.0-39.0
Percentage of DerivativeGainLossOnDerivativeNet56.928.522.4225.011.4-2.7117.443.569.9162.536.3-217.682.821.568.463.6-25.422.216.52.122.813.7

us-gaap:ForeignExchangeFuture


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-6.0-16.0120.010.043-22.0-20.0-22.0-15.0-2.0-2.03.04.09.0-7.0-7.014-1.0-10.0-10.0-10.01.015-10.0
Percentage of DerivativeGainLossOnDerivativeNet3.8-4.26.20.08.1-7.995.79.08.518.80.511.810.35.147.431.8-11.151.9-0.3-20.84.93.51.3-4.4-7.8

us-gaap:GuaranteedMinimumIncomeBenefit


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-8.031922446213-685.053-106.0-65.0114-381.054413899541189332389-131.0-228.0
Percentage of DerivativeGainLossOnDerivativeNet5.083.3116.71150.0173.2125.2-230.447.525.1-142.590.5-317.6141.448.1521.1-245.5187.3344.4102.2185.463.680.3

us-gaap:OtherContract


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value3.0-1.03.01.0-1.0-2.00.0-14.07.0-1.0-5.0-8.08.02.0-1.0-5.0-1.02.0-11.03.00.0-2.0
Percentage of DerivativeGainLossOnDerivativeNet-1.9-0.31.625.0-0.80.4-0.06.3-2.71.21.247.127.62.5-5.322.7-1.67.4-3.56.2-0.00.7

us-gaap:SingleStockFuture


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-64.0-44.0-78.0-52.0-103.0125-49.0-6.0-20.0-63.0118-100.0-44.022-92.0-57.0-38.0-74.0-48.0-45.0-28.0-15.0-79.084-2.0
Percentage of DerivativeGainLossOnDerivativeNet40.0-11.5-40.6-1300.0-83.7-22.9213.02.77.778.8-28.0588.2-151.727.8-484.2259.1-60.3-274.1-15.2-93.813.65.3-100.0-24.4-1.6

us-gaap:DividendsCommonStockCash us-gaap:StatementEquityComponents

us-gaap:DividendsCommonStockCash

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value352352352353-353.0-340.03403413443353363373393323303313323243243233233142182182170.00.00.00.0810.00.00.00.00.00.0200118117
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0100.00.00.00.00.00.00.0100.0100.0100.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Effect
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value18-36.0-9.03.0-45.0-17.04.034-2.0-63.025-6.028-17.0
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents dei:LegalEntity

cb:OtherAceLimitedSubsidiariesAndEliminations


Effect
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-4.03.0-44.0-18.0-1.034-1.0-65.027-6.028-17.0
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents44.4100.097.8105.9-25.0100.050.0103.2108.0100.0100.0100.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents us-gaap:ConsolidatedEntities

srt:GuarantorSubsidiaries


Effect
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-4.00.00.01.00.00.00.00.00.0
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents44.40.0-0.0-5.90.00.0-0.0-0.00.0

srt:ParentCompany


Effect
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-1.00.0-1.00.05.00.0-1.02.0-2.0
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents11.10.02.2-0.0125.00.050.0-3.2-8.0

us-gaap:EquitySecuritiesFvNiRealizedGainLoss us-gaap:InvestmentType

us-gaap:EquitySecuritiesFvNiRealizedGainLoss

us-gaap:EquitySecurities


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1503674670.0148-29.0383.05.058-81.035-2.0-11.0
Percentage of EquitySecuritiesFvNiRealizedGainLoss100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ExciseAndSalesTaxes

us-gaap:ExciseAndSalesTaxes


Excise
Period End2021-06-302020-06-30
Value5.06.0
Percentage of ExciseAndSalesTaxes100.0100.0

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

us-gaap:FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci

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


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value6.01119127.0-44.0
Percentage of FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci100.0100.0100.0100.0100.0100.0

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


Fair
Period End2021-06-302021-03-312020-09-302020-06-302020-03-31
Value7.010.020-5.0-15.0
Percentage of FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci116.790.9166.7-71.434.1

us-gaap:FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:ShortTermInvestments, us-gaap:FairValueInputsLevel3


Fair
Period End2020-09-302020-06-302020-03-31
Value-1.00.00.0
Percentage of FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci-8.30.0-0.0

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

us-gaap:FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss

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


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value6000000.0-3000000.05000000.0-14000000.0
Percentage of FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss100.0100.0100.0100.0

us-gaap:FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:CorporateDebtSecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value3000000.05000000.0-14000000.00-1000000.00-6000000.0000
Percentage of FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss0.0100.0100.00.00.00.00.00.00.00.0

us-gaap:EquitySecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value4000000.02000000.03000000.02000000.01000000.0-2000000.00-1000000.0-1000000.0-1000000.0-1000000.01000000.0-3000000.00-1000000.00
Percentage of FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss66.7-66.70.00.020.014.30.00.00.00.00.00.00.00.00.00.0

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

us-gaap:FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss

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


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value46213-685.0-106.0-65.011454423754
Percentage of FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:GuaranteedInsuranceContractTypeOfBenefit

us-gaap:FairValueInputsLevel3, us-gaap:GuaranteedMinimumIncomeBenefit


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value-8.0319213-685.0
Percentage of FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss0.00.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1

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


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value-6.03.01313
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1100.0100.0100.0100.0

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


Fair
Period End2021-06-302020-06-302020-03-31
Value-3.01.02.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings150.07.715.4

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:CorporateDebtSecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-3.013130.01.0-1.06.0-2.00.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings10.0100.0100.00.00.00.00.00.00.00.0

us-gaap:EquitySecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-5.0-2.00.0-2.01.02.0-6.01.01.02.012-7.03.0-2.03.0-1.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings183.3-66.70.00.07.715.40.00.00.00.00.00.00.00.00.00.0

us-gaap:ForeignGovernmentDebtSecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-1.01.02.00.00.01.02.00.00.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings10.07.715.40.00.00.00.00.00.00.0

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

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss

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


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value6.06.0-1.045
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss100.0100.0100.0100.0

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


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value5.08.0-6.0-14.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss83.3133.3600.0-31.1

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:CorporateDebtSecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value131.0-45.0-4.01.04.07.0-9.0-3.0-1.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss0.0-100.0-100.00.00.00.00.00.00.00.0

us-gaap:ForeignGovernmentDebtSecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value21-6.0-14.0-8.00.06.0-2.0-7.09.01.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss0.0600.0-31.10.00.00.00.00.00.00.0

us-gaap:ShortTermInvestments, us-gaap:FairValueInputsLevel3


Fair
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-1.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss0.0-0.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases

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


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value24016983139
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases100.0100.0100.0100.0

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


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value541216782
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases22.571.680.759.0

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


Fair
Period End2021-06-30
Value1.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases0.4

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:CorporateDebtSecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value1948313917612112898217139169
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases0.0100.0100.00.00.00.00.00.00.00.0

us-gaap:EquitySecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value4.03.09.03.08.03.0155.05.09.0116.03.0171.017
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases1.71.80.00.09.62.20.00.00.00.00.00.00.00.00.00.0

us-gaap:ForeignGovernmentDebtSecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value41678268435398958724
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases0.080.759.00.00.00.00.00.00.00.0

us-gaap:MortgageBackedSecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value2.00.00.01.00.0181.00.04.07.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases0.00.00.00.00.00.00.00.00.00.0

us-gaap:ShortTermInvestments, us-gaap:FairValueInputsLevel3


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value2.01.05.07.01.01.00.02.04.00.00.00.01.08.01.01.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases0.80.60.00.01.20.70.00.00.00.00.00.00.00.00.00.0

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

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales

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


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value50254819
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales100.0100.0100.0100.0

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


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value9.07.01646
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales18.028.033.3242.1

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


Fair
Period End2021-06-30
Value1.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales2.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:CorporateDebtSecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value80481918363718455124
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales0.0100.0100.00.00.00.00.00.00.00.0

us-gaap:EquitySecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value6.03.01.03.09.04.04.03.04.010.05.0185.00.08.05.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales12.012.00.00.018.821.10.00.00.00.00.00.00.00.00.00.0

us-gaap:ForeignGovernmentDebtSecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value19164635145.022111914
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales0.033.3242.10.00.00.00.00.00.00.0

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

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements

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


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value15212585101
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements100.0100.0100.0100.0

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


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value5118271.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements33.614.431.81.0

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


Fair
Period End2021-06-302021-03-31
Value4.09.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements2.67.2

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:CorporateDebtSecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value548510164785885633957
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements0.0100.0100.00.00.00.00.00.00.00.0

us-gaap:ForeignGovernmentDebtSecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value19271.03.018264.01.01.03.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements0.031.81.00.00.00.00.00.00.00.0

us-gaap:MortgageBackedSecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value1.00.00.00.01.01.0181.00.08.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements0.00.00.00.00.00.00.00.00.00.0

us-gaap:ShortTermInvestments, us-gaap:FairValueInputsLevel3


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0.05.05.01.00.06.00.00.00.01.05.06.01.01.01.08.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements0.04.00.00.00.05.90.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3 us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3

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


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value29170.091
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3100.0100.00.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3 us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:CorporateDebtSecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value1.00.0911.010.05.0186.00.0111
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel30.00.0100.00.00.00.00.00.00.00.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3 us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3

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


Fair
Period End2021-06-302020-06-302020-03-31
Value-3.0-71.0-1.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3100.0100.0100.0

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


Fair
Period End2021-06-302020-06-302020-03-31
Value-10.0-13.0-3.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3333.318.3300.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3 us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:CorporateDebtSecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-1.0-71.0-1.00.00.00.0-21.00.0-10.0-26.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel30.0100.0100.00.00.00.00.00.00.00.0

us-gaap:ForeignGovernmentDebtSecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value0.0-13.0-3.00.00.0-15.0-2.00.00.0-3.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel30.018.3300.00.00.00.00.00.00.00.0

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

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings

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


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value46213-685.0-106.0-65.011454423754
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:GuaranteedInsuranceContractTypeOfBenefit

us-gaap:FairValueInputsLevel3, us-gaap:GuaranteedMinimumIncomeBenefit


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value-8.0319213-685.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings0.00.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:GuaranteedInsuranceContractTypeOfBenefit

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease

us-gaap:FairValueInputsLevel3, us-gaap:GuaranteedMinimumIncomeBenefit


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value-8.0-10.0-6.09.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease100.0100.0100.0100.0

us-gaap:FairValueOptionChangesInFairValueGainLoss1

us-gaap:FairValueOptionChangesInFairValueGainLoss1


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-8.031922446213-685.053-106.0-65.0114
Percentage of FairValueOptionChangesInFairValueGainLoss1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax


Foreign
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-97.076-132.0-222.0-61.0-68.0-79.084-11.0132939140-77.0261514-19.07229-22.039-7.0-2.0-40.0-31.02.0-19.0-14.0-9.0-16.0-26.0-5.07648-50.0-9.0-5.07620-30.0-79.0-44.0-62.061-9.0
Percentage of ForeignCurrencyTransactionGainLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnSaleOfInvestments us-gaap:InvestmentType

us-gaap:GainLossOnSaleOfInvestments

cb:Equitysecuritiesandotherinvestments


Gain
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value454534187-24.02232-1.0
Percentage of GainLossOnSaleOfInvestments100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecurities


Gain
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value454534187-24.024321.0485.010.0
Percentage of GainLossOnSaleOfInvestments100.0100.0100.0100.0100.0109.1100.0-100.00.00.00.0

us-gaap:GainLossOnSaleOfOtherInvestments

us-gaap:GainLossOnSaleOfOtherInvestments


Gain
Period End2021-06-302021-03-312020-09-302020-06-302019-09-302019-06-30
Value0.0-1.0-3.0-40.0-4.00.0
Percentage of GainLossOnSaleOfOtherInvestments0.0100.0100.0100.0100.00.0

us-gaap:GoodwillPeriodIncreaseDecrease

us-gaap:GoodwillPeriodIncreaseDecrease


Goodwill
Period End2021-06-302021-03-31
Value9412
Percentage of GoodwillPeriodIncreaseDecrease100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromEquityMethodInvestments


Income
Period End2021-06-302020-06-30
Value774-73.0
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments dei:LegalEntity

cb:HuataiGroup


Income
Period End2021-06-302020-06-30
Value4931
Percentage of IncomeLossFromEquityMethodInvestments6.3-42.5

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value33-663.0-288.049488-392.0-201.0351145-502.0547317235-724.0311-225.0-112.0-491.012-127.052-34.0358-227.094-46.0143-167.0101-64.0213-406.086144-294.026156-65.0-469.050580-77.014
Percentage of IncreaseDecreaseInAccountsPayableAndAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedIncomeTaxesPayable

us-gaap:IncreaseDecreaseInAccruedIncomeTaxesPayable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-51.0101141-97.0-107.0109-90.067-250.0266-21.0-42.013688-103.0-159.0-294.0191-161.0241-76.0143-140.0112-140.0209.0150-71.015-47.0-18.0-9.029-211.044-41.041-35.0165-123.032-136.086-55.0115
Percentage of IncreaseDecreaseInAccruedIncomeTaxesPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes


Increase
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value46-15.028913-81.045577630-117.0692.037639-15.0127-109.061-90.042-60.055-101.0-7.0-104.076-117.00.0-71.0-71.0-63.0-35.053-45.0-2.01.0-14.042-28.0-19.0-132.0-32.0-14.062
Percentage of IncreaseDecreaseInDeferredIncomeTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDeferredPolicyAcquisitionCosts

us-gaap:IncreaseDecreaseInDeferredPolicyAcquisitionCosts


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value117811215-3.065787213163315713875617712059133274562480811181081289178129991121231471218010187726.05.08564215.07691
Percentage of IncreaseDecreaseInDeferredPolicyAcquisitionCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInFuturePolicyBenefitReserves

us-gaap:IncreaseDecreaseInFuturePolicyBenefitReserves


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value6347985156316747604165268658315294405923782859436648554283564232734449552727271482-45.0-46.054-13.053
Percentage of IncreaseDecreaseInFuturePolicyBenefitReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve

us-gaap:IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value7971368-448.019402944228-534.03717862134703153-420.0-652.03200-257.0-154.0-584.0586402-72.0-150.0-138.0233-320.0137673
Percentage of IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve100.0100.0100.0100.0100.0100.0100.0100.0100.0