ANTM


Line plots across dimensions of each concept
Tables

Table of contents



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

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:Revenues

us-gaap:PremiumsEarnedNet

us-gaap:NetInvestmentIncome

us-gaap:OtherIncome

us-gaap:CostOfGoodsAndServicesSold

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:InterestExpense

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:OperatingIncomeLoss
us-gaap:ProductOrService

us-gaap:InterestExpense

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:Assets

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:OtherAssetsCurrent

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:Goodwill
us-gaap:BusinessAcquisition, us-gaap:StatementBusinessSegments

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:OtherAssetsNoncurrent

us-gaap:LiabilitiesCurrent

us-gaap:LongTermDebtCurrent

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent

us-gaap:OtherLiabilitiesCurrent

us-gaap:LongTermDebt

us-gaap:LongTermDebtNoncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapital

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquireInvestments

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt
us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:SubsequentEventType
us-gaap:DebtInstrument

us-gaap:PaymentsOfDividends

us-gaap:PaymentsOfDividends

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:RepaymentsOfLongTermDebt
us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:SubsequentEventType
us-gaap:DebtInstrument
us-gaap:ShortTermDebtType
us-gaap:DebtInstrumentInterestRateStatedPercentage

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

us-gaap:ShareBasedCompensation
us-gaap:BalanceSheetLocation
us-gaap:OperatingLeaseRightOfUseAsset

antm:AOCICashFlowHedgeUnrealizedGainLossBeforeTax
us-gaap:InvestmentType
antm:EquitySecuritiesRealizedGainsLossesonSales

antm:Netrealizedlossesgainsonfinancialinstruments
us-gaap:InvestmentType

antm:OperatingRevenue

antm:OtherNetChangeInUnrecognizedPeriodicBenefitCostsForDefinedBenefitPensionAndPostretirementBenefitPlansTaxBenefitExpense

antm:PotentiallyDilutiveRestrictedStockUnitsContingentOnOperatingResults

antm:Proceedsfromsaleofequityandfixedmaturitysecurities

antm:ProductRevenue

antm:SecuritiesLendingTransactionsInitialCollateralPercentageValue

antm:SecuritiesLendingTransactionsRatioofFairValueofCollateralHeldToSecuritiesOnLoan

antm:StockRepurchasedAndRetiredDuringPeriodAveragePrice
us-gaap:InvestmentType
antm:UnrealizedGainsandLossesRecognizedonEquitySecurities

us-gaap:AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebtSubsequentAdjustments
us-gaap:StatementEquityComponents

us-gaap:AmortizationOfIntangibleAssets

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AvailableForSaleSecuritiesGrossRealizedGains

us-gaap:AvailableForSaleSecuritiesGrossRealizedLosses

us-gaap:BenefitsLossesAndExpenses

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CommonStockDividendsPerShareCashPaid

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:DeferredIncomeTaxExpenseBenefit
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanInterestCost
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1

us-gaap:DepreciationAmortizationAndAccretionNet

us-gaap:DividendsCommonStock
us-gaap:StatementEquityComponents

us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents

us-gaap:FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
us-gaap:FinancialInstrument

us-gaap:GainsLossesOnExtinguishmentOfDebt
us-gaap:DebtInstrument

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities

us-gaap:IncreaseDecreaseInDeferredRevenue

us-gaap:IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable

us-gaap:IncreaseDecreaseInInsuranceLiabilities

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInReceivables

us-gaap:IncreaseDecreaseInTradingSecurities

us-gaap:InsuranceServicesRevenue
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:MajorCustomers
us-gaap:MajorCustomers
us-gaap:MajorCustomers, us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:LeaseCost

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1
us-gaap:StatementBusinessSegments

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1
us-gaap:StatementBusinessSegments

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1
us-gaap:StatementBusinessSegments
us-gaap:LitigationCase, us-gaap:GainContingenciesByNature
us-gaap:LossContingencyDamagesSoughtValue

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeasePayments

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax

us-gaap:OtherComprehensiveIncomeLossTax

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

us-gaap:OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsPeriodIncreaseDecrease

us-gaap:OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities

us-gaap:OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities
us-gaap:InvestmentType

us-gaap:OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities

us-gaap:OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities

us-gaap:OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet

us-gaap:PaymentsForLossesAndLossAdjustmentExpense
us-gaap:StatementBusinessSegments

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromRepaymentsOfCommercialPaper

us-gaap:ProceedsFromSaleOfAvailableForSaleSecurities

us-gaap:ProceedsFromShortTermDebt

us-gaap:ProceedsFromStockOptionsExercised

us-gaap:RepaymentsOfShortTermDebt

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
us-gaap:AwardType, antm:Performancemeasurementperiod
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

us-gaap:ShortTermLeaseCost
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised
us-gaap:StatementEquityComponents

us-gaap:StockRepurchasedAndRetiredDuringPeriodShares
us-gaap:StatementEquityComponents

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue
us-gaap:StatementEquityComponents

us-gaap:SubleaseIncome

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense
us-gaap:StatementBusinessSegments

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
us-gaap:StatementBusinessSegments

us-gaap:SupplementaryInsuranceInformationOtherOperatingExpense

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment

antm:AccumulatedOtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax

antm:AvailableForSaleSecuritiesAccumulatedOtherComprehensiveIncomeNetDeferredTaxLiability

antm:AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostNoncurrent

antm:AvailableForSaleSecuritiesOtherThanTemporaryImpairmentsInAccumulatedOtherComprehensiveIncomeDeferredTaxLiabilityAsset

antm:CashFlowHedgingInstrumentsAccumulatedOtherComprehensiveIncomeNetDeferredTaxAsset

antm:DeferredNetActuarialGainLossPostretirementBenefits

antm:DeferredPriorServiceCostCreditPostretirementBenefitPlans

antm:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeAdjustmentsNetOfTax

antm:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetDeferredTaxAsset

antm:EquitySecurities
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:InvestmentType
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:InvestmentType

antm:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpensePurchaseAdjustments
us-gaap:StatementBusinessSegments
us-gaap:SubsequentEventType
antm:PatientProtectionAffordableCareActHealthInsuranceProviderFee

antm:SelfFundedReceivablesNet

antm:SelffundedReceivablesAllowanceForDoubtfulAccounts

antm:ShortDurationContractLiabilityForClaimsAdjustmentExpense
us-gaap:StatementBusinessSegments

antm:ShortdurationcontractliabilityforunpaidclaimsandadjustmentexpenseNet
us-gaap:StatementBusinessSegments

us-gaap:AccruedInvestmentIncomeReceivable

us-gaap:AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities

us-gaap:AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxDebtSecurities

us-gaap:AllowanceForDoubtfulOtherReceivablesCurrent

us-gaap:AociLossCashFlowHedgeCumulativeGainLossAfterTax
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis

us-gaap:AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:InvestmentType

us-gaap:AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax

us-gaap:AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesAmortizedCost
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
us-gaap:InvestmentType

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesNoncurrent
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear
us-gaap:InvestmentType

us-gaap:CashAndCashEquivalentsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:CommercialPaper
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency
us-gaap:LongtermDebtType

us-gaap:ConvertibleDebtNoncurrent
us-gaap:DebtInstrument
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency

us-gaap:CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption
us-gaap:StatementEquityComponents

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLoss
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:InvestmentType

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits

us-gaap:DeferredTaxAssetsUnrealizedCurrencyLosses

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax
us-gaap:AssetsSoldUnderAgreementsToRepurchaseMaturityPeriods
us-gaap:DepositsReceivedForSecuritiesLoanedAtCarryingValue
us-gaap:AssetsSoldUnderAgreementsToRepurchaseMaturityPeriods, us-gaap:FinancialInstrument
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:InvestmentType
us-gaap:DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement
us-gaap:InvestmentType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:InvestmentType
us-gaap:DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement
us-gaap:InvestmentType

us-gaap:EquitySecuritiesFvNi

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
us-gaap:FinancialInstrument
us-gaap:ShortTermDebtType
us-gaap:FederalHomeLoanBankAdvancesMaturitiesSummaryDueInNextRollingTwelveMonths

us-gaap:FinancialLiabilitiesFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpense
us-gaap:StatementBusinessSegments

us-gaap:LiabilityForFuturePolicyBenefits

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
us-gaap:StatementBusinessSegments
us-gaap:CreditFacility, us-gaap:DebtInstrument
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
us-gaap:ShortTermDebtType
us-gaap:Range
us-gaap:LossContingencyEstimateOfPossibleLoss

us-gaap:NotesPayable
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency
us-gaap:BalanceSheetLocation
us-gaap:OperatingLeaseLiabilityCurrent
us-gaap:BalanceSheetLocation
us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

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

us-gaap:OtherPolicyholderFunds

us-gaap:OtherReceivables

us-gaap:PremiumsReceivableAllowanceForDoubtfulAccounts

us-gaap:PremiumsReceivableAtCarryingValue

us-gaap:ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments
us-gaap:StatementBusinessSegments

us-gaap:RestrictedCashAndInvestmentsCurrent

us-gaap:SecuritiesHeldAsCollateralAtFairValue
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:SecuritiesLoanedFairValueOfCollateral

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:ShortTermBorrowings
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency
us-gaap:ShortTermDebtType
us-gaap:ShortdurationInsuranceContractsAccidentYear, us-gaap:StatementBusinessSegments
us-gaap:ShortdurationInsuranceContractsIncurredButNotReportedIbnrClaimsLiabilityNet

us-gaap:ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndClaimAdjustmentExpenseOtherReconcilingItem
us-gaap:StatementBusinessSegments

us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

us-gaap:UnearnedPremiums

Tables

  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:CommonStockValue ███████▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁████████████33333332222222222222222222333333333333NANANA4NANANA
 us-gaap:SharesOutstanding us-gaap:StatementEquityComponents us-gaap:CommonStock▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂▁▁▁▁▂▂▂▂▂▃▃▃▃▃▄▄▅▅▅▆▆▇██252252253255257257258260255256257263265263263263262261261261264268270274281293296299300304314325331339349362368377394403NA449NANANA
us-gaap:CommonStockSharesIssued ▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂▂▂▂▂▂▂▂▂▃▃▃▄▄▄▄▅▅▆▆▇▇█252252253255257257258260255256257263265263263263262261261261264268270274281293296299300304314325331339349362368377NANANA449NANANA
us-gaap:CommonStockSharesOutstanding ▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂▂▂▂▂▂▂▂▂▃▃▃▄▄▄▄▅▅▆▆▇▇█252252253255257257258260255256257263265263263263262261261261264268270274281293296299300304314325331339349362368377NANANA449NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding 256NA260261262NA265264262NA267270270NA268268267NA269274280NA284286292NA304303305NA321331339NA360371379NA402421446NANANANA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic 252NA255256257NA259258255NA260264264NA263263261NA261263266NA273276284NA297299303NA318327335NA356366374NA397417441NANANANA
us-gaap:EarningsPerShareBasic █▅▆▆█▂▅▆▇▆▄▄▅▂▃▄▄▁▄▅▄▃▃▄▃▁▃▄▄▂▃▃▄▂▃▃▄▂▃▃▃█▂▂▂6.033.694.644.446.031.643.74.075.134.82.873.233.821.42.352.972.690.692.513.273.251.882.312.642.460.52.212.672.921.522.171.962.560.971.921.922.481.411.861.731.996.021.551.441.17
us-gaap:EarningsPerShareDiluted █▅▆▆█▂▅▅▇▆▄▄▅▂▃▄▄▁▃▄▄▃▃▄▃▁▃▄▄▂▃▃▄▂▃▃▄▂▃▃▃█▂▂▂5.943.624.554.365.911.613.623.984.994.672.83.163.731.372.32.912.630.682.433.133.091.82.222.562.40.492.162.642.891.512.151.942.530.961.91.892.441.41.841.711.965.951.531.431.16
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:Revenues █▇▇▆▆▅▅▅▅▅▅▅▅▄▄▄▄▄▄▄▃▃▃▃▃▃▃▃▂▁▁▁▁▁▁▁▁▁▁▁▁▃▁▁▁296212740726674254662466623373232512294322537226802242622407225252171421403214562028820187199012001519051189841855718473178591790117969177951768715536153531540715415153171539815100148941464714598144571509819046154251541315143
us-gaap:PremiumsEarnedNet █▇▇▆▆▅▅▅▄▅▄▄▄▄▄▄▃▃▃▃▂▂▂▁▁25517240362379323501228432181921451212482090221086207972081320951201371978619948189881874518513185161761017577172261706816517NA16580164931643514160140371416114138NA141811391313684NA133661325713909NANANANA
us-gaap:NetInvestmentIncome ▆▇▆█▄▇▆▅▅▅▄▃▄▄▃▃▂▁▁▂▁▂▂▃▂254268242285210262250229229238220200207212200194171162161186167177174188183NA167153162179168169169NA170187184NA205202201NANANANA
us-gaap:OtherIncome ▅█▇▅▄▄▄▄▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁158730962651167615451485152914673011106559109881213121099NA1241151201061413415NA1088NA4185NANANANA
us-gaap:CostOfGoodsAndServicesSold █▅▄▁▁▁▁▁19841149745980000NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PolicyholderBenefitsAndClaimsIncurredNet ██▇▇▆▆▅▅▄▅▅▅▄▄▄▄▃▃▃▂▁▂▁▁▁21489213832075320368192821893618185177271704518672181031791717542175671692216805155381631515469152051412614857142111412113664NA14075138321374812363119841209311771NA120621192211228NA112051098511382NANANANA
us-gaap:SellingGeneralAndAdministrativeExpense █▆▅▄▃▇▆▅▅▅▂▂▄▄▃▂▄▄▃▂▃▂▂▁▁3781350234183278316636183546342834283393301130533191326431242969320032683080304031453032296828852861NA2580247023652412207820812165NA211920112076NA206321542174NANANANA
us-gaap:InterestExpense ▅▄▄▄▄▄▄▅▄▂▁▄█▃▃▄▄▄▂▂▂▂▂▁▁194190185184187189188191184163150189235177172185187179164154154153155145146NA151151153151133117109NA108103105NA10610099NANANANA
us-gaap:SellingGeneralAndAdministrativeExpense █▆▅▄▃▇▆▅▅▅▂▂▄▄▃▂▄▄▃▂▃▂▂▁▁3781350234183278316636183546342834283393301130533191326431242969320032683080304031453032296828852861NA2580247023652412207820812165NA211920112076NA206321542174NANANANA
us-gaap:OperatingIncomeLoss █▄▅▅▇▂▄▆▇▁▃▄▆▂▄▅▆▁▄▅▆▃▄▄▄2194109815281433194075012491559186738198212271585653107815001570439122115121579885119112221118NA10091231136743110039911212NA9729461350NA103910581286NANANANA
 us-gaap:OperatingIncomeLoss us-gaap:ProductOrService antm:CommercialSpecialty1420NA9309831587NA83310521408NA5349671302NA63710751293NA6199121267NA915919886NANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingIncomeLoss us-gaap:ProductOrService antm:GovernmentBusinessSegment411NA616478383NA466537490NA457293318NA478450325NA626609324NA283313239NANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingIncomeLoss us-gaap:ProductOrService antm:IngenioRxSegment349NANANA0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:InterestExpense ▅▄▄▄▄▄▄▅▄▂▁▄█▃▃▄▄▄▂▂▂▂▂▁▁194190185184187189188191184163150189235177172185187179164154154153155145146NA151151153151133117109NA108103105NA10610099NANANANA
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax ▄█▄▆▆▄▆▆▆▆▆▆██▆▆█▄▆▆▁▄▃▆▆-11-100-100000011001-100-3-1-200NA100NA0-10NANANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest █▄▆▆▇▂▅▆▇▁▅▅▆▃▅▆▅▂▅▆▆▄▄▅▅▂▄▅▅▂▄▄▅2089109814891453194554212421503178012411181205151565811361448131237411291558156988710871263113046987912081282480101910481309NANANANANANANANANANANANA
us-gaap:IncomeTaxExpenseBenefit ▇▆▆▆▇▆▆▇▇▁▇▇▇▆▇██▆▇██▇▇▇▇566164306314394118282450467-1106372350505290518667609193474698703380456532438NA22641040117334405453NA362305500NA397407458NANANANA
us-gaap:ComprehensiveIncomeNetOfTax ▄▄▅▆█▂▄▄▅▅▄▄▅▂▃▄▃▁▂▃▄▂▂▄▄811937126713791914250931991110412557558821116464618798613104438621931345489878845NA678430928376865620976NA471793953NA970696975NANANANA
us-gaap:NetIncomeLoss ▅▃▄▄▅▂▃▃▄▄▃▃▃▂▂▃▂▁▂▃▃▂▂▃▂▁▂▃▃▂▂▂▃▂▂▂▃▂▃▃▃█▃▂▂152393411831139155142496010531312123074685510093686177807031806548598655066307317011486568008854646916438563356837019265487397228762741730693580
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings1523NA1183113915514259601054131212307468551009368617780703180654859865506630731701NANA800885464691643856NANANA926NANANA876NANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:Assets █▇▇▇▆▆▆▆▆▅▅▅▅▄▄▄▄▄▄▄▄▄▄▄▄▃▃▃▃▃▂▂▂▁▂▁▁▁8239977453778097585174523715717444574367733007054068309682376894365083643996406263858617176233564263655466206562058623036168559574602635961259408589555581754535524965201852549508775091850166NANANA52125NANANA
us-gaap:Liabilities █▇▇▆▆▆▆▇▇▆▆▅▆▅▅▅▅▅▅▅▅▄▄▄▄▃▄▄▄▄▃▂▂▂▂▁▁▁5070645725464774505844525430304535145642462884403742361418054285139982396553982940311386733909941201412113781337764379263734034809354553507935090351523200130891289682873028831266952693926354NANANA27262NANANA
us-gaap:LiabilitiesAndStockholdersEquity █▇▇▇▆▆▆▆▆▅▅▅▅▄▄▄▄▄▄▄▄▄▄▄▄▃▃▃▃▃▂▂▂▁▂▁▁▁8239977453778097585174523715717444574367733007054068309682376894365083643996406263858617176233564263655466206562058623036168559574602635961259408589555581754535524965201852549508775091850166NANANA52125NANANA
us-gaap:StockholdersEquity ███▇▇▅▆▆▄▄▃▄▃▃▂▂▁▁▁▁▂▂▂▂▂▂▂▂▂▂▂▁▁▁▂▂▂▂▂▂▂▂316933172831332307932999828541290942872527012265022594826431260912510024744242332354723044232362306224334242512429424376243452476524808245322431823802238162364323528232882371824181239782381224361237902451924863NANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▃▃▃▃▃▃▃▃▃▃▃▄▄▄▅▅▅▆▆▆▇█933894489524949494829536972097478489854787658897889388058741867786168555868787079943100621009410154100031076510769107381069710853108691120411369116791200912415125231286213403136481455215192NANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:RetainedEarnings██▇▇▇▆▆▆▆▅▅▅▅▅▄▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁233602257322104216792113619988201821975719241180541730617667173571656016364159181531014778147611435214150140141386313744140111381314040138171327512647125561222411921114901157211418111991072110581999797959598NANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:AssetsCurrent █▇▇▆▆▅▆▆▆▆▆▆▆▅▄▄▄▃▄▄▅▄▄▄▄▃▃▂▂▂▃▂▂▁▂▁▁▁4125639033395043780536611343213710837370369743626236973371303798134314329243295732965308623153933202347403222832227324283180629745295962890028660282682964028470275432709727552267562681926140NANANA28070NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▆▆▅▅▅▄▅▅▅▄▇▅█▅▃▁▁▂▁▁▁▂▁▂▂▁▂▁▁▂▂▂▂▂▂▁▂▂▂▂▄▅534549374190407844823934426046824630360860974561677240752546158216762113154715531397215117171784197115822185134716652484244219532279220125081699240217882246202735264816NANANA
us-gaap:OtherAssetsCurrent █▃▃▃▃▃▅▅▆▃▂▂▂▂▂▃▄▁▂▃▄▁▂▃▃▂▂▂▂▂▂▂▂▂▁▁▁▁41352319211321512172210428753106355222491822177418231781190620832494155518782178253414741922216524171677180718231891182918751913192018591600160116391534NANANA1268NANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:PropertyPlantAndEquipmentNet █▇▇▆▆▆▆▅▄▄▄▄▄▄▄▄▄▄▃▃▃▄▃▃▃▃▃▃▃▃▂▂▂▂▂▁▁▁33503133292128372799273525922392223721742049197519571977200619891998201919301931191519441848182918111801180617691738173815361478145414181316121211861155NANANA1099NANANA
us-gaap:Goodwill █▇▇▇▇▇▇▇▇▆▅▅▅▅▅▅▅▅▅▅▅▄▄▄▄▄▅▅▅▅▂▂▁▁▁▁▁▁2166120500205002050020500205042046820414201851923117587175611756117561175621756217562175621755017541175701708217082170821691616917174971748817489175101446914534138581385813846132631326413264NANANA13264NANANA
us-gaap:IntangibleAssetsNetExcludingGoodwill █▄▅▅▅▆▆▆▆▃▁▁▁▁▂▂▂▂▂▃▃▁▂▂▃▃▅▆▆▆▂▂▁▁▂▁▁▂96138674875688408925900791019224907683687840788279237964801280598107815882158275829379588010807183878441892189889055910282108126787879317994788379407996NANANA8259NANANA
us-gaap:OtherAssetsNoncurrent █▆▇▇▆▃▄▄▃▂▃▃▂▁▅▃▂▁▂▃▃▂▂▂▂▂▁▁▁▁▁▁▁▁▂▂▂▁1833135016671608145375810749508325658507786404671168862609485661864746619664675635645456464483486451458445433539557542488NANANA393NANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:LiabilitiesCurrent █▆▆▆▆▅▆▇▇▆▇▆▆▅▅▅▅▄▃▅▅▄▃▄▃▂▂▂▂▂▁▂▂▂▂▁▁▁2703923617232342309022682219652417424505247552335624412225672317421294210362081620810190921836520673213051875318395191761849316351160421603416030158361408316177159551582515786141071416014009NANANA14673NANANA
us-gaap:LongTermDebtCurrent ██▄▅▅▅▅▄▄▇▇▄▆▅▅▅▃▁▁▄▄▄▄▃▃▃▁▃▃▃▁▅▅▇▇▃▃▄16031598700850851849849650650127412736241152928927927399006246256256255095185180399399557081391012741274456359705NANANA60NANANA
us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent ▆▄▅▄▄▅█▇▇▆▅▃▃▄▃▄▄▂▂▄▅▃▃▄▄▃▂▂▂▂▁▁▁▂▁▁▁▂50584198444540283951495962865931581650244454381536224014371742724164331832934433445436513447426341133426330132862936313226482788280931242814259926672942NANANA2994NANANA
us-gaap:OtherLiabilitiesCurrent █▅▅▆▆▄▄▄▅▄▅▅▅▅▄▃▄▃▂▂▂▂▂▂▁▁▂▂▂▁▁▂▁▁▁▁▁▁52023692386739354037319033063302347533433788366836433581312927622883281622822246217118611903190118051674182818441848171317661958166016541582164015501617NANANA1775NANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:LongTermDebt ▁█30019385NANANA18066NANANA18656NANANA15286NANANA153241571916093NA1475215163NANA1409114514NANA14727NANANA9695NANANA8853NANANA8399NANANA
us-gaap:LongTermDebtNoncurrent █▇█▇▇▇▇▇▇▇▅▅▆▅▅▅▅▆▆▆▅▅▅▅▅▄▅▅▅▅▄▂▁▁▁▁▁▁1900517787188201743617396172171730017515181101738213777150881544914358142421420214864153241571915468147641412714538140371393213573145141409114030141701339510135846284208622829285428147NANANA8338NANANA
us-gaap:OtherLiabilitiesNoncurrent █▆▇█▇▄▄▃▂▂▂▂▁▁▃▆▅▂▄▄▃▃▁▁▁▁▁▂▂▂▂▂▃▃▂▃▂▂16951420162216661612118211451074942925944898889883104014791319994122812251099103589185283283687494597110139571013102510299651019958963NANANA1115NANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:StockholdersEquity ███▇▇▅▆▆▄▄▃▄▃▃▂▂▁▁▁▁▂▂▂▂▂▂▂▂▂▂▂▁▁▁▂▂▂▂▂▂▂▂316933172831332307932999828541290942872527012265022594826431260912510024744242332354723044232362306224334242512429424376243452476524808245322431823802238162364323528232882371824181239782381224361237902451924863NANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▃▃▃▃▃▃▃▃▃▃▃▄▄▄▅▅▅▆▆▆▇█933894489524949494829536972097478489854787658897889388058741867786168555868787079943100621009410154100031076510769107381069710853108691120411369116791200912415125231286213403136481455215192NANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:RetainedEarnings██▇▇▇▆▆▆▆▅▅▅▅▅▄▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁233602257322104216792113619988201821975719241180541730617667173571656016364159181531014778147611435214150140141386313744140111381314040138171327512647125561222411921114901157211418111991072110581999797959598NANANA
us-gaap:CommonStockValue ███████▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁████████████33333332222222222222222222333333333333NANANA4NANANA
us-gaap:AdditionalPaidInCapital ▂▃▃▃▃▃▃▃▁▁▁▂▂▂▁▁▁▁▁▁▃▄▄▄▃▅▅▅▅▅▅▅▆▆▇▇▇█9338944895249494948295369720974784898547876588978893880587418677861685558687870799431006210094101541000310765107691073810697108531086911204113691167912009124151252312862NANANA15192NANANA
us-gaap:RetainedEarningsAccumulatedDeficit ██▇▇▇▆▆▆▆▅▅▅▅▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▂▂▂▂▂▁▁▁▁▁2336022573221042167921136199882018219757192411805417306176671735716560163641591815310147781476114352141501401413863137441401113813140401381713275126471255612224119211149011572114181119910721NANANA9598NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▁▄▄▄▃▁▂▂▂▅▅▅▅▄▄▄▄▄▅▆▇▇▇█▇▇▆▆▇▇█▇▇▆▆▇▇▇-1008-296-299-383-623-986-811-782-720-101-126-134-161-267-363-364-382-292-2160237171333475327183-4-27342299386212235114132343251224NANANA68NANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities █▆▆▆▆▄▄▄▇▁█▄█▄▅▄▆▅▄▅▆▄▄▅▆251513271667143716304636065422214-13012404393268827496366213049493431173165030560510711387NANA4259567592405211223NANANA1114NANANA-322NANANANA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▂█▄▅▆█▆▅▆▁█▅▅██▆▅█▇█▂█▇▅▆-2784723-1698-1165-652773-687-778-565-3620807-1041-1227670523-316-1391630244684-2711660-107-783-744NANA-867-1195-1266-1317-198720NANANA282NANANA191NANANANA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▅▂▄▃▃▁▃▄▃█▁▁▆▅▃▃▃▂▃▁▄▃▃▃▃679-1304144-677-429-1561-340288-6272433-1676-15631234581-524-437-353-1012-593-1703311-528-560-474-258NANA123-57954715661141-1167NANANA-785NANANA-1157NANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities █▆▆▆▆▄▄▄▇▁█▄█▄▅▄▆▅▄▅▆▄▄▅▆251513271667143716304636065422214-13012404393268827496366213049493431173165030560510711387NANA4259567592405211223NANANA1114NANANA-322NANANANA
us-gaap:NetIncomeLoss ▅▃▄▄▅▂▃▃▄▄▃▃▃▂▂▃▂▁▂▃▃▂▂▃▂▁▂▃▃▂▂▂▃▂▂▂▃▂▃▃▃█▃▂▂152393411831139155142496010531312123074685510093686177807031806548598655066307317011486568008854646916438563356837019265487397228762741730693580
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings1523NA1183113915514259601054131212307468551009368617780703180654859865506630731701NANA800885464691643856NANANA926NANANA876NANANANA
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet ▁▃▃▄▃▄▅▅▅█▂▂▄▄▃▃▂▁▂▂▂▂▃▃▃-1316164515455450541128-2464231210-13129-312182924NANA171037-14710NANANA11NANANA12NANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▂█▄▅▆█▆▅▆▁█▅▅██▆▅█▇█▂█▇▅▆-2784723-1698-1165-652773-687-778-565-3620807-1041-1227670523-316-1391630244684-2711660-107-783-744NANA-867-1195-1266-1317-198720NANANA282NANANA191NANANANA
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▄█▆▄▅▇█▇▄▆▄▃▂▃▃▂▂▅▃▂▁▇▂▂▂20435127122123432035531421828321816912716816413311722917814088304139135135NANA142107169149102123NANANA101NANANA120NANANANA
us-gaap:PaymentsToAcquireInvestments 3896NANANA6069NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▅▂▄▃▃▁▃▄▃█▁▁▆▅▃▃▃▂▃▁▄▃▃▃▃679-1304144-677-429-1561-340288-6272433-1676-15631234581-524-437-353-1012-593-1703311-528-560-474-258NANA123-57954715661141-1167NANANA-785NANANA-1157NANANANA
us-gaap:ProceedsFromIssuanceOfLongTermDebt ▁▁▄▁▁▁▁▁▂█▁▁▁▁▁30002473-2200-1836545700000NANA0-2NANA02700NANANANANANA15333212NANANANANANANANANANANANANANA
us-gaap:RepaymentsOfLongTermDebt ▁▂▄▁▁▂▄▁▃█▁▃▂▁▁▁▁▂▃█▁▁▇▁▁5220085010632917300662188505284010000310456191316016852024NANA05560800100350NANANA700NANANA15NANANANA
 us-gaap:RepaymentsOfLongTermDebt us-gaap:DebtInstrument us-gaap:ConvertibleDebt▂▆▁▁▃█▃▁▂522000106328480037NANANANANANANANA3800-98-1646NANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PaymentsOfDividends █▆▆▆▆▅▅▅▅▅▅▄▄▄▄▄▄▄▄▄▄▁▁▁▁240202204206206193195196191179181171172171171170170163163163166117119120123NA1111121138790939585889192NANANANANANANANA
us-gaap:PaymentsOfDividends █▆▆▆▆▅▅▅▅▅▅▄▄▄▄▄▄▄▄▄▄▁▁▁▁240202204206206193195196191179181171172171171170170163163163166117119120123NA1111121138790939585889192NANANANANANANANA
us-gaap:PaymentsForRepurchaseOfCommonStock ▄▃▅▄▃▄▃▃▃▃▇▄▁▁▁▁▁▁▂▅▅▃▄▆█529305644458294493397400394362112645850000001056367743435788141262NANA275340668655493679NANANA741NANANA1388NANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:RepaymentsOfLongTermDebt ▁▂▄▁▁▂▄▁▃█▁▃▂▁▁▁▁▂▃█▁▁▇▁▁5220085010632917300662188505284010000310456191316016852024NANA05560800100350NANANA700NANANA15NANANANA
 us-gaap:RepaymentsOfLongTermDebt us-gaap:DebtInstrument us-gaap:ConvertibleDebt▂▆▁▁▃█▃▁▂522000106328480037NANANANANANANANA3800-98-1646NANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:ShortTermDebtType us-gaap:FederalHomeLoanBankAdvances▁▅▆███▆▆▅▄0.006790.016640.01990.024370.025630.024580.021490.019590.016390.01386NANANA0.00643NANANA0.00424NANANA0.001950.002NANA0.0017NANANA0.00206NANANANANANANANANANANANANANANA

Common Stock Value

us-gaap:CommonStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value333333322222222222222222223333333333334
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Par Or Stated Value Per Share

Shares Outstanding

us-gaap:StatementEquityComponents

us-gaap:SharesOutstanding

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-31
Value252252253255257257258260255256257263265263263263262261261261264268270274281293296299300304314325331339349362368377394403449503
Percentage of SharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value252252253255257257258260255256257263265263263263262261261261264268270274281293296299300304314325331339349362368377449
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value252252253255257257258260255256257263265263263263262261261261264268270274281293296299300304314325331339349362368377449
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Authorized

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value256260261262265264262267270270268268267269274280284286292304303305321331339360371379402421446
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value252255256257259258255260264264263263261261263266273276284297299303318327335356366374397417441
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value6.033.694.644.446.031.643.74.075.134.82.873.233.821.42.352.972.690.692.513.273.251.882.312.642.460.52.212.672.921.522.171.962.560.971.921.922.481.411.861.731.996.021.551.441.17
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value5.943.624.554.365.911.613.623.984.994.672.83.163.731.372.32.912.630.682.433.133.091.82.222.562.40.492.162.642.891.512.151.942.530.961.91.892.441.41.841.711.965.951.531.431.16
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Income Loss From Continuing Operations Per Basic Share

Income Loss From Continuing Operations Per Diluted Share

Revenues

us-gaap:Revenues



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value296212740726674254662466623373232512294322537226802242622407225252171421403214562028820187199012001519051189841855718473178591790117969177951768715536153531540715415153171539815100148941464714598144571509819046154251541315143
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Premiums Earned Net

us-gaap:PremiumsEarnedNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value2551724036237932350122843218192145121248209022108620797208132095120137197861994818988187451851318516176101757717226170681651716580164931643514160140371416114138141811391313684133661325713909
Percentage of PremiumsEarnedNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues86.187.789.292.392.693.492.392.692.793.092.792.993.092.792.493.093.692.993.092.592.492.692.892.492.592.392.792.991.191.491.991.792.192.191.991.691.792.1

Net Investment Income

us-gaap:NetInvestmentIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value254268242285210262250229229238220200207212200194171162161186167177174188183167153162179168169169170187184205202201
Percentage of NetInvestmentIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.91.00.91.10.91.11.11.01.01.11.00.90.91.00.90.90.80.80.80.90.90.90.91.01.00.90.90.91.21.11.11.11.11.21.21.41.41.3

Realized Investment Gains Losses

Other Income

us-gaap:OtherIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value158730962651167615451485152914673011106559109881213121099124115120106141341510884185
Percentage of OtherIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues5.411.39.96.66.36.46.66.40.10.10.00.00.00.00.00.00.00.00.00.10.10.10.10.10.10.70.70.70.70.90.20.10.10.10.10.00.10.0

Cost Of Goods And Services Sold

us-gaap:CostOfGoodsAndServicesSold



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value19841149745980000
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.00.00.00.00.0
Percentage of Revenues6.74.22.80.40.00.00.00.0

Cost Of Goods Sold

Policyholder Benefits And Claims Incurred Net

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value2148921383207532036819282189361818517727170451867218103179171754217567169221680515538163151546915205141261485714211141211366414075138321374812363119841209311771120621192211228112051098511382
Percentage of PolicyholderBenefitsAndClaimsIncurredNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues72.578.077.880.078.281.078.277.375.682.380.780.077.980.979.178.376.680.877.776.074.278.376.676.476.578.377.777.779.678.178.576.478.378.975.476.876.075.4

General And Administrative Expense

Selling General And Administrative Expense

us-gaap:SellingGeneralAndAdministrativeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value37813502341832783166361835463428342833933011305331913264312429693200326830803040314530322968288528612580247023652412207820812165211920112076206321542174
Percentage of SellingGeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues12.812.812.812.912.815.515.314.915.215.013.413.614.215.014.613.815.816.215.515.216.516.016.015.616.014.413.913.415.513.513.514.013.813.313.914.114.914.4

Interest Expense

us-gaap:InterestExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value19419018518418718918819118416315018923517717218518717916415415415315514514615115115315113311710910810310510610099
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.70.70.70.70.80.80.80.80.80.70.70.81.00.80.80.90.90.90.80.80.80.80.80.80.80.80.90.91.00.90.80.70.70.70.70.70.70.7

General And Administrative Expense

Selling General And Administrative Expense

us-gaap:SellingGeneralAndAdministrativeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value37813502341832783166361835463428342833933011305331913264312429693200326830803040314530322968288528612580247023652412207820812165211920112076206321542174
Percentage of SellingGeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues12.812.812.812.912.815.515.314.915.215.013.413.614.215.014.613.815.816.215.515.216.516.016.015.616.014.413.913.415.513.513.514.013.813.313.914.114.914.4

Operating Income Loss

us-gaap:OperatingIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value2194109815281433194075012491559186738198212271585653107815001570439122115121579885119112221118100912311367431100399112129729461350103910581286
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues7.44.05.75.67.93.25.46.88.31.74.45.57.03.05.07.07.72.26.17.68.34.76.46.66.35.66.97.72.86.56.47.96.36.39.17.17.38.5

us-gaap:ProductOrService

antm:CommercialSpecialty



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-31
Value14209309831587833105214085349671302637107512936199121267915919886
Percentage of OperatingIncomeLoss64.760.968.681.866.767.575.454.478.982.159.271.782.350.760.380.276.975.279.2
Percentage of Revenues4.83.53.96.43.64.66.22.44.35.83.05.06.43.14.66.74.95.05.0
Percentage of Revenues antm:CommercialSpecialty0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

antm:GovernmentBusinessSegment



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-31
Value411616478383466537490457293318478450325626609324283313239
Percentage of OperatingIncomeLoss18.740.333.419.737.334.526.346.623.920.144.430.020.751.340.320.523.825.621.4
Percentage of Revenues1.42.31.91.62.02.32.22.01.31.42.22.11.63.13.01.71.51.71.3
Percentage of Revenues antm:GovernmentBusinessSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

antm:IngenioRxSegment



Period End2020-03-312019-03-31
Value3490
Percentage of OperatingIncomeLoss15.90.0
Percentage of Revenues1.20.0
Percentage of Revenues antm:IngenioRxSegment0.00.0

antm:OtherSegment



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-31
Value14-18-28-30-50-31-31-10-34-35-38-25-47-23-9-12-8-10-7
Percentage of OperatingIncomeLoss0.6-1.2-2.0-1.5-4.0-2.0-1.7-1.0-2.8-2.2-3.6-1.7-3.0-2.0-0.6-0.8-0.7-0.8-0.6
Percentage of Revenues0.0-0.1-0.1-0.1-0.2-0.1-0.1-0.0-0.2-0.2-0.2-0.1-0.2-0.1-0.0-0.1-0.0-0.1-0.0
Percentage of Revenues antm:OtherSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest Expense

us-gaap:InterestExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value19419018518418718918819118416315018923517717218518717916415415415315514514615115115315113311710910810310510610099
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.70.70.70.70.80.80.80.80.80.70.70.81.00.80.80.90.90.90.80.80.80.80.80.80.80.80.90.91.00.90.80.70.70.70.70.70.70.7

Interest Expense Debt

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

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value-11-100-100000011001-100-3-1-2001000-10
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.00.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-0.00.0-0.00.00.0-0.00.0-0.00.00.00.00.00.00.00.0-0.00.0-0.00.00.0-0.0-0.0-0.0-0.0-0.00.00.0-0.00.0-0.00.0

Income Loss From Continuing Operations

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value2089109814891453194554212421503178012411181205151565811361448131237411291558156988710871263113046987912081282480101910481309
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues7.14.05.65.77.92.35.36.67.90.55.05.46.73.05.36.86.51.95.77.88.24.75.96.86.32.64.96.87.33.16.66.88.5

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value566164306314394118282450467-110637235050529051866760919347469870338045653243822641040117334405453362305500397407458
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues1.90.61.11.21.60.51.22.02.1-4.91.71.62.21.32.43.13.01.02.43.53.72.02.52.92.51.32.32.30.12.22.62.92.42.03.42.72.83.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value811937126713791914250931991110412557558821116464618798613104438621931345489878845678430928376865620976471793953970696975
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues2.73.44.75.47.81.14.04.34.95.53.43.95.02.12.93.73.00.52.23.14.91.82.64.84.73.82.45.32.45.64.06.33.15.36.46.74.86.5

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value152393411831139155142496010531312123074685510093686177807031806548598655066307317011486568008854646916438563356837019265487397228762741730693580
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues5.13.44.44.56.31.84.14.65.85.43.33.84.51.72.93.63.50.93.34.34.52.73.44.03.90.83.74.55.03.04.54.25.62.24.44.66.23.75.15.05.814.44.74.53.8

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value15231183113915514259601054131212307468551009368617780703180654859865506630731701800885464691643856926876
Percentage of NetIncomeLoss100.0100.0100.0100.0100.2100.0100.1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues5.14.44.56.31.84.14.65.85.43.33.84.51.72.93.63.50.93.34.34.52.73.44.03.94.55.03.04.54.25.66.25.8
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets

us-gaap:Assets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value823997745377809758517452371571744457436773300705406830968237689436508364399640626385861717623356426365546620656205862303616855957460263596125940858955558175453552496520185254950877509185016652125
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value507064572546477450584452543030453514564246288440374236141805428513998239655398294031138673390994120141211378133776437926373403480935455350793509035152320013089128968287302883126695269392635427262
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets61.559.059.759.459.760.160.961.463.162.462.061.362.261.461.662.263.162.762.764.162.960.960.960.960.558.458.858.859.159.657.356.655.255.254.952.552.952.552.3

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value823997745377809758517452371571744457436773300705406830968237689436508364399640626385861717623356426365546620656205862303616855957460263596125940858955558175453552496520185254950877509185016652125
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value3169331728313323079329998285412909428725270122650225948264312609125100247442423323547230442323623062243342425124294243762434524765248082453224318238022381623643235282328823718241812397823812243612379024519248632143122990
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets38.541.040.340.640.339.939.138.636.937.638.038.737.838.638.437.836.937.337.335.937.139.139.139.139.541.641.241.240.940.442.743.444.844.845.147.547.147.50.00.00.047.70.00.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value-1008-296-299-383-623-986-811-782-720-101-126-134-161-267-363-364-382-292-2160237171333475327183-4-2734229938621223511413234325122437214016668-895156
Percentage of StockholdersEquity-3.2-0.9-1.0-1.2-2.1-3.5-2.8-2.7-2.7-0.4-0.5-0.5-0.6-1.1-1.5-1.5-1.6-1.3-0.90.01.00.71.41.91.30.7-0.0-0.11.41.31.60.91.00.50.61.41.00.91.50.60.70.3-4.20.7
Percentage of Assets-1.2-0.4-0.4-0.5-0.8-1.4-1.1-1.1-1.0-0.1-0.2-0.2-0.2-0.4-0.6-0.6-0.6-0.5-0.30.00.40.30.50.80.50.3-0.0-0.00.60.50.70.40.40.20.30.70.50.40.00.00.00.10.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value9338944895249494948295369720974784898547876588978893880587418677861685558687870799431006210094101541000310765107691073810697108531086911204113691167912009124151252312862134031364814552151921684318441
Percentage of StockholdersEquity29.529.830.430.831.633.433.433.931.432.333.833.734.135.135.335.836.637.137.437.840.941.541.641.741.143.543.443.844.045.645.647.448.350.250.651.352.254.055.057.459.461.178.680.2
Percentage of Assets11.312.212.212.512.713.313.113.111.612.112.813.012.913.513.613.513.513.913.913.515.216.216.316.316.218.117.918.018.018.419.520.521.722.522.924.424.625.60.00.00.029.10.00.0
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

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value33333332222222222222222222333333333333444455
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of 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:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value23360225732210421679211361998820182197571924118054173061766717357165601636415918153101477814761143521415014014138631374414011138131404013817132751264712556122241192111490115721141811199107211058199979795959854794387
Percentage of StockholdersEquity73.771.170.570.470.570.069.468.871.268.166.766.866.566.066.165.765.064.163.562.258.157.857.156.457.655.856.656.354.653.152.751.750.749.348.847.246.745.043.442.040.038.625.619.1
Percentage of Assets28.329.128.428.628.427.927.126.626.225.625.325.925.225.425.424.824.023.923.722.321.622.622.322.122.723.223.323.222.321.522.522.422.722.122.022.422.021.40.00.00.018.40.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value412563903339504378053661134321371083737036974362623697337130379813431432924329573296530862315393320234740322283222732428318062974529596289002866028268296402847027543270972755226756268192614028070
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets50.150.450.849.849.148.049.850.350.451.454.154.455.152.751.151.451.650.050.651.753.051.951.952.051.649.949.148.548.247.953.152.252.552.152.452.652.752.153.9

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value53454937419040784482393442604682463036086097456167724075254615821676211315471553139721511717178419711582218513471665248424421953227922012508169924021788224620273526481621832767
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.56.45.45.46.05.55.76.36.35.18.96.79.86.34.02.52.63.42.52.42.13.52.82.93.22.73.62.32.84.24.43.64.34.24.83.34.73.60.00.00.09.20.00.0

Other Assets Current

us-gaap:OtherAssetsCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value413523192113215121722104287531063552224918221774182317811906208324941555187821782534147419222165241716771807182318911829187519131920185916001601163915341268
Percentage of OtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.03.02.72.82.92.93.94.24.83.22.72.62.62.73.03.33.92.53.03.43.92.43.13.53.92.83.03.13.23.13.43.53.73.63.03.13.23.12.4

Property Plant And Equipment Gross

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value335031332921283727992735259223922237217420491975195719772006198919982019193019311915194418481829181118011806176917381738153614781454141813161212118611551099
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.14.03.83.73.83.83.53.23.13.13.02.92.83.03.13.13.13.33.13.02.93.13.02.92.93.03.03.02.92.92.82.72.82.72.52.42.32.32.1

Goodwill

us-gaap:Goodwill



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value21661205002050020500205002050420468204142018519231175871756117561175611756217562175621756217550175411757017082170821708216916169171749717488174891751014469145341385813858138461326313264132641326413461
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets26.326.526.327.027.528.627.527.527.527.325.725.725.527.027.327.427.528.528.227.326.827.527.527.427.428.429.029.329.429.725.926.726.426.626.426.126.126.425.40.0

us-gaap:BusinessAcquisition, us-gaap:StatementBusinessSegments

antm:BeaconHealthOptions, us-gaap:AllOtherSegments



Period End2020-03-31
Value1049
Percentage of Goodwill4.8
Percentage of Assets1.3
Percentage of Assets antm:BeaconHealthOptions us-gaap:AllOtherSegments0.0

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value961386748756884089259007910192249076836878407882792379648012805981078158821582758293795880108071838784418921898890559102821081267878793179947883794079968259
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.711.211.311.712.012.612.212.412.411.911.511.611.512.212.412.612.713.213.212.912.712.812.913.013.614.214.815.115.215.414.714.915.015.215.215.515.615.915.8

Finite Lived Intangible Assets Net

Deferred Tax Assets Liabilities Net

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1833135016671608145375810749508325658507786404671168862609485661864746619664675635645456464483486451458445433539557542488393
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.21.72.12.11.91.11.41.31.10.81.21.10.90.71.81.31.00.81.11.31.11.01.11.11.01.10.80.80.80.80.80.80.80.81.01.11.11.00.8

Liabilities Current

us-gaap:LiabilitiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value270392361723234230902268221965241742450524755233562441222567231742129421036208162081019092183652067321305187531839519176184931635116042160341603015836140831617715955158251578614107141601400914673
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets32.830.529.930.430.430.732.533.033.833.135.733.133.632.732.732.532.630.929.532.232.530.229.630.830.027.426.626.927.026.925.229.730.430.430.027.727.827.928.2

Long Term Debt Current

us-gaap:LongTermDebtCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1603159870085085184984965065012741273624115292892792739900624625625625509518518039939955708139101274127445635970560
Percentage of LongTermDebtCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.92.10.91.11.11.21.10.90.91.81.90.91.71.41.41.40.60.00.01.01.01.01.00.80.80.90.00.70.70.90.01.51.72.52.40.90.71.40.1

Accounts Payable And Accrued Liabilities Current

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value505841984445402839514959628659315816502444543815362240143717427241643318329344334454365134474263411334263301328629363132264827882809312428142599266729422994
Percentage of AccountsPayableAndAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.15.45.75.35.36.98.48.07.97.16.55.65.36.25.86.76.55.45.36.96.85.95.66.86.75.85.55.54.95.34.75.15.46.05.45.15.25.95.7

Accrued Income Taxes Current

Other Liabilities Current

us-gaap:OtherLiabilitiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value520236923867393540373190330633023475334337883668364335813129276228832816228222462171186119031901180516741828184418481713176619581660165415821640155016171775
Percentage of OtherLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.34.85.05.25.44.54.44.44.74.75.55.45.35.54.94.34.54.63.73.53.33.03.13.12.92.83.03.13.12.93.23.63.23.23.03.23.03.23.4

Long Term Debt

us-gaap:LongTermDebt



Period End2020-03-312019-12-312018-12-312017-12-312016-12-312015-12-312015-09-302015-06-302014-12-312014-09-302013-12-312013-09-302012-12-312011-12-312010-12-312009-12-31
Value300193851806618656152861532415719160931475215163140911451414727969588538399
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.425.025.226.423.524.825.225.023.824.423.724.125.018.617.616.1

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value19005177871882017436173961721717300175151811017382137771508815449143581424214202148641532415719154681476414127145381403713932135731451414091140301417013395101358462842086228292854281478338
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets23.123.024.223.023.324.123.223.624.724.620.222.122.422.122.122.223.324.825.224.122.522.823.422.522.622.824.123.623.624.024.018.616.116.216.416.316.816.216.0

Deferred Tax Liabilities Noncurrent

Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value169514201622166616121182114510749429259448988898831040147913199941228122510991035891852832836874945971101395710131025102996510199589631115
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.11.82.12.22.21.71.51.41.31.31.41.31.31.41.62.32.11.62.01.91.71.71.41.41.31.41.51.61.61.71.71.92.02.01.82.01.91.92.1

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value3169331728313323079329998285412909428725270122650225948264312609125100247442423323547230442323623062243342425124294243762434524765248082453224318238022381623643235282328823718241812397823812243612379024519248632143122990
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets38.541.040.340.640.339.939.138.636.937.638.038.737.838.638.437.836.937.337.335.937.139.139.139.139.541.641.241.240.940.442.743.444.844.845.147.547.147.50.00.00.047.70.00.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value-1008-296-299-383-623-986-811-782-720-101-126-134-161-267-363-364-382-292-2160237171333475327183-4-2734229938621223511413234325122437214016668-895156
Percentage of StockholdersEquity-3.2-0.9-1.0-1.2-2.1-3.5-2.8-2.7-2.7-0.4-0.5-0.5-0.6-1.1-1.5-1.5-1.6-1.3-0.90.01.00.71.41.91.30.7-0.0-0.11.41.31.60.91.00.50.61.41.00.91.50.60.70.3-4.20.7
Percentage of Assets-1.2-0.4-0.4-0.5-0.8-1.4-1.1-1.1-1.0-0.1-0.2-0.2-0.2-0.4-0.6-0.6-0.6-0.5-0.30.00.40.30.50.80.50.3-0.0-0.00.60.50.70.40.40.20.30.70.50.40.00.00.00.10.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value9338944895249494948295369720974784898547876588978893880587418677861685558687870799431006210094101541000310765107691073810697108531086911204113691167912009124151252312862134031364814552151921684318441
Percentage of StockholdersEquity29.529.830.430.831.633.433.433.931.432.333.833.734.135.135.335.836.637.137.437.840.941.541.641.741.143.543.443.844.045.645.647.448.350.250.651.352.254.055.057.459.461.178.680.2
Percentage of Assets11.312.212.212.512.713.313.113.111.612.112.813.012.913.513.613.513.513.913.913.515.216.216.316.316.218.117.918.018.018.419.520.521.722.522.924.424.625.60.00.00.029.10.00.0
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

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value33333332222222222222222222333333333333444455
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of 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:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value23360225732210421679211361998820182197571924118054173061766717357165601636415918153101477814761143521415014014138631374414011138131404013817132751264712556122241192111490115721141811199107211058199979795959854794387
Percentage of StockholdersEquity73.771.170.570.470.570.069.468.871.268.166.766.866.566.066.165.765.064.163.562.258.157.857.156.457.655.856.656.354.653.152.751.750.749.348.847.246.745.043.442.040.038.625.619.1
Percentage of Assets28.329.128.428.628.427.927.126.626.225.625.325.925.225.425.424.824.023.923.722.321.622.622.322.122.723.223.323.222.321.522.522.422.722.122.022.422.021.40.00.00.018.40.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value333333322222222222222222223333333333334
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Additional Paid In Capital

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value933894489524949494829536972097478489854787658897889388058741867786168555868787079943100621009410154100031076510769107381069710853108691120411369116791200912415125231286215192
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.312.212.212.512.713.313.113.111.612.112.813.012.913.513.613.513.513.913.913.515.216.216.316.316.218.117.918.018.018.419.520.521.722.522.924.424.625.629.1

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value23360225732210421679211361998820182197571924118054173061766717357165601636415918153101477814761143521415014014138631374414011138131404013817132751264712556122241192111490115721141811199107219598
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets28.329.128.428.628.427.927.126.626.225.625.325.925.225.425.424.824.023.923.722.321.622.622.322.122.723.223.323.222.321.522.522.422.722.122.022.422.021.418.4

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value-1008-296-299-383-623-986-811-782-720-101-126-134-161-267-363-364-382-292-2160237171333475327183-4-2734229938621223511413234325122468
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-1.2-0.4-0.4-0.5-0.8-1.4-1.1-1.1-1.0-0.1-0.2-0.2-0.2-0.4-0.6-0.6-0.6-0.5-0.30.00.40.30.50.80.50.3-0.0-0.00.60.50.70.40.40.20.30.70.50.40.1

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value251513271667143716304636065422214-1301240439326882749636621304949343117316503056051071138742595675924052112231114-322
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues8.54.86.25.66.62.02.62.49.8-5.710.71.811.91.34.53.16.44.71.75.98.71.63.35.87.82.45.44.91.63.47.97.5-2.1

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value-2784723-1698-1165-652773-687-778-565-3620807-1041-1227670523-316-1391630244684-2711660-107-783-744-867-1195-1266-1317-198720282191
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-9.42.6-6.4-4.6-2.63.3-3.0-3.4-2.5-16.03.6-4.6-5.43.12.4-1.5-6.93.11.23.4-14.23.5-0.6-4.2-4.2-4.9-6.8-8.2-8.6-12.90.11.91.3

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value679-1304144-677-429-1561-340288-6272433-1676-15631234581-524-437-353-1012-593-1703311-528-560-474-258123-57954715661141-1167-785-1157
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues2.3-4.80.5-2.7-1.7-6.7-1.51.3-2.810.7-7.5-7.05.52.7-2.4-2.0-1.7-5.0-3.0-8.51.6-2.8-3.0-2.6-1.40.7-3.33.510.27.4-7.6-5.3-7.7

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value251513271667143716304636065422214-1301240439326882749636621304949343117316503056051071138742595675924052112231114-322
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues8.54.86.25.66.62.02.62.49.8-5.710.71.811.91.34.53.16.44.71.75.98.71.63.35.87.82.45.44.91.63.47.97.5-2.1

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value152393411831139155142496010531312123074685510093686177807031806548598655066307317011486568008854646916438563356837019265487397228762741730693580
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues5.13.44.44.56.31.84.14.65.85.43.33.84.51.72.93.63.50.93.34.34.52.73.44.03.90.83.74.55.03.04.54.25.62.24.44.66.23.75.15.05.814.44.74.53.8

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value15231183113915514259601054131212307468551009368617780703180654859865506630731701800885464691643856926876
Percentage of NetIncomeLoss100.0100.0100.0100.0100.2100.0100.1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues5.14.44.56.31.84.14.65.85.43.33.84.51.72.93.63.50.93.34.34.52.73.44.03.94.55.03.04.54.25.66.25.8
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value-1316164515455450541128-2464231210-13129-312182924171037-147101112
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value-2784723-1698-1165-652773-687-778-565-3620807-1041-1227670523-316-1391630244684-2711660-107-783-744-867-1195-1266-1317-198720282191
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-9.42.6-6.4-4.6-2.63.3-3.0-3.4-2.5-16.03.6-4.6-5.43.12.4-1.5-6.93.11.23.4-14.23.5-0.6-4.2-4.2-4.9-6.8-8.2-8.6-12.90.11.91.3

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value20435127122123432035531421828321816912716816413311722917814088304139135135142107169149102123101120
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments To Acquire Investments

us-gaap:PaymentsToAcquireInvestments



Period End2020-03-312019-03-31
Value38966069
Percentage of PaymentsToAcquireInvestments100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value679-1304144-677-429-1561-340288-6272433-1676-15631234581-524-437-353-1012-593-1703311-528-560-474-258123-57954715661141-1167-785-1157
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues2.3-4.80.5-2.7-1.7-6.7-1.51.3-2.810.7-7.5-7.05.52.7-2.4-2.0-1.7-5.0-3.0-8.51.6-2.8-3.0-2.6-1.40.7-3.33.510.27.4-7.6-5.3-7.7

Proceeds From Issuance Of Long Term Debt

us-gaap:ProceedsFromIssuanceOfLongTermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302014-12-312014-09-302012-12-312012-09-30
Value30002473-2200-18365457000000-20270015333212
Percentage of ProceedsFromIssuanceOfLongTermDebt100.00.0100.0100.0100.00.0100.0100.0100.0100.00.00.00.00.00.00.0100.00.0100.0100.0100.0

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value52200850106329173006621885052840100003104561913160168520240556080010035070015
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:SubsequentEventType

antm:A5YearFacility, us-gaap:RevolvingCreditFacility, us-gaap:SubsequentEvent



Period End2020-04-23
Value300
Percentage of RepaymentsOfLongTermDebt0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations antm:A5YearFacility us-gaap:RevolvingCreditFacility us-gaap:SubsequentEvent0.0

us-gaap:DebtInstrument

us-gaap:ConvertibleDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312015-12-312015-09-302015-06-30
Value5220001063284800373800-98-1646
Percentage of RepaymentsOfLongTermDebt100.0100.00.0100.0100.097.611.0100.05.71223.3-21.6-86.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations us-gaap:ConvertibleDebt0.00.00.00.00.00.00.00.00.00.00.00.0

Payments Of Dividends

us-gaap:PaymentsOfDividends



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-10-222013-07-232013-09-302013-05-152013-06-302013-02-202013-03-312012-11-062012-12-312012-07-242012-09-302012-05-162012-06-302012-01-242012-03-312011-12-312011-07-262011-09-302011-05-172011-06-302011-02-222011-03-31
Value240202204206206193195196191179181171172171171170170163163163166117119120123110111111112112113113878790909393959585888891919292
Percentage of PaymentsOfDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments Of Dividends

us-gaap:PaymentsOfDividends



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-10-222013-07-232013-09-302013-05-152013-06-302013-02-202013-03-312012-11-062012-12-312012-07-242012-09-302012-05-162012-06-302012-01-242012-03-312011-12-312011-07-262011-09-302011-05-172011-06-302011-02-222011-03-31
Value240202204206206193195196191179181171172171171170170163163163166117119120123110111111112112113113878790909393959585888891919292
Percentage of PaymentsOfDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-10-102013-07-112013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value52930564445829449339740039436211264585000000105636774343578814126272602753406686554936797411388
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value52200850106329173006621885052840100003104561913160168520240556080010035070015
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:SubsequentEventType

antm:A5YearFacility, us-gaap:RevolvingCreditFacility, us-gaap:SubsequentEvent



Period End2020-04-23
Value300
Percentage of RepaymentsOfLongTermDebt0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations antm:A5YearFacility us-gaap:RevolvingCreditFacility us-gaap:SubsequentEvent0.0

us-gaap:DebtInstrument

us-gaap:ConvertibleDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312015-12-312015-09-302015-06-30
Value5220001063284800373800-98-1646
Percentage of RepaymentsOfLongTermDebt100.0100.00.0100.0100.097.611.0100.05.71223.3-21.6-86.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations us-gaap:ConvertibleDebt0.00.00.00.00.00.00.00.00.00.00.00.0

Debt Instrument Interest Rate Stated Percentage

us-gaap:ShortTermDebtType

us-gaap:DebtInstrumentInterestRateStatedPercentage

us-gaap:FederalHomeLoanBankAdvances



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312014-09-302013-12-312012-12-31
Value0.006790.016640.01990.024370.025630.024580.021490.019590.016390.013860.006430.004240.001950.0020.00170.00206
Percentage of DebtInstrumentInterestRateStatedPercentage100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations us-gaap:FederalHomeLoanBankAdvances0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302010-09-30
Value0.271-0.0099999999999999810.2060.2160.203-0.00500000000000000440.2270.2990.263-0.289000000000000030.3320.2910.333-0.00300000000000000270.4560.4610.4640.0060000000000000050.420.4490.4490.00400000000000000360.420.4210.3880.2570.3390.312-0.038999999999999980.3260.3860.3460.3460.3040.35
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value33333344444555566666677891012151817181820202021242426
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value216.4190.31185.47182.4181.02149.65148.58147.09145.62124.31122.55121.72119.24102.8101.68101.2100.8487.2386.685.8384.3170.370.1569.9569.4665.3865.8566.1164.8364.6763.5863.5663.5862.361.7661.4760.8759.656.98
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-31
Value10000000000001000001
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod100.00.00.0100.00.0100.0100.0100.0100.0100.0100.00.00.0100.00.00.0100.00.0100.0100.0

Share Based Compensation

us-gaap:ShareBasedCompensation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value676886707091563542384344424041443737424127433650384121225239322214
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Liabilities

Deferred Tax Assets Net

Unrecognized Tax Benefits

Deferred Tax Assets Valuation Allowance

Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions

Operating Lease Right Of Use Asset

us-gaap:BalanceSheetLocation

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherNoncurrentAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value915575577637606
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0

Cash And Cash Equivalents Period Increase Decrease

Proceeds From Repayments Of Short Term Debt

antm:AOCICashFlowHedgeUnrealizedGainLossBeforeTax



Period End2020-03-312019-03-31
Value-327000000.0-308000000.0
Percentage of AOCICashFlowHedgeUnrealizedGainLossBeforeTax100.0100.0

us-gaap:InvestmentType

antm:EquitySecuritiesRealizedGainsLossesonSales

us-gaap:EquitySecurities



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value-1894-6-21151-11
Percentage of EquitySecuritiesRealizedGainsLossesonSales100.0100.0100.0100.0100.0100.0

antm:Netrealizedlossesgainsonfinancialinstruments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-242411178-185274-26
Percentage of Netrealizedlossesgainsonfinancialinstruments100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentType

us-gaap:EquitySecurities



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value-50-12-1679-16627
Percentage of Netrealizedlossesgainsonfinancialinstruments208.3-50.0-1600.0101.389.7100.0

antm:OperatingRevenue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2944827132264442517724388233042298022715
Percentage of OperatingRevenue100.0100.0100.0100.0100.0100.0100.0100.0

antm:OtherNetChangeInUnrecognizedPeriodicBenefitCostsForDefinedBenefitPensionAndPostretirementBenefitPlansTaxBenefitExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-312-1-1-1-22-2-2-243-3-2-21-1-2-2-23333-81221
Percentage of OtherNetChangeInUnrecognizedPeriodicBenefitCostsForDefinedBenefitPensionAndPostretirementBenefitPlansTaxBenefitExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:PotentiallyDilutiveRestrictedStockUnitsContingentOnOperatingResults



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value200000.00.00.00.0200000.00.00.00.0300000.00.0300000.00.0100000.00.00.00.0500000.00.00.0-100000.0500000.00.00.00.0700000.0
Percentage of PotentiallyDilutiveRestrictedStockUnitsContingentOnOperatingResults100.00.00.00.0100.00.00.00.0100.00.0100.00.0100.00.00.00.0100.00.00.0100.0100.00.00.00.0100.0

antm:Proceedsfromsaleofequityandfixedmaturitysecurities



Period End2020-03-312019-03-31
Value27285236
Percentage of Proceedsfromsaleofequityandfixedmaturitysecurities100.0100.0

antm:ProductRevenue



Period End2020-03-312019-03-31
Value23440
Percentage of ProductRevenue100.00.0

antm:SecuritiesLendingTransactionsInitialCollateralPercentageValue



Period End2020-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1.020.00.01.020.00.00.01.020.00.00.01.02
Percentage of SecuritiesLendingTransactionsInitialCollateralPercentageValue100.00.00.0100.00.00.00.0100.00.00.00.0100.0

antm:SecuritiesLendingTransactionsRatioofFairValueofCollateralHeldToSecuritiesOnLoan



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value1.030.00.00.01.03-0.0100000000000000090.0100000000000000090.01.020.0100000000000000090.00.01.030.00.00.01.030.0
Percentage of SecuritiesLendingTransactionsRatioofFairValueofCollateralHeldToSecuritiesOnLoan100.00.00.00.0100.0100.0100.00.0100.0100.00.00.0100.00.00.00.0100.00.0

antm:StockRepurchasedAndRetiredDuringPeriodAveragePrice



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value275.38-1.7700000000000387-3.419999999999959-1.3900000000000432275.238.1899999999999988.539999999999992-1.8999999999999773233.513.12999999999999556.43000000000000719.560000000000002160.810.0-0.129999999999995458.75136.882.3199999999999934.10000000000000853.959999999999993788.14
Percentage of StockRepurchasedAndRetiredDuringPeriodAveragePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentType

antm:UnrealizedGainsandLossesRecognizedonEquitySecurities

us-gaap:EquitySecurities



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value-684-22589916
Percentage of UnrealizedGainsandLossesRecognizedonEquitySecurities100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebtSubsequentAdjustments



Period End2020-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-30
Value-42000000.0-9000000.0-52000000.0-242000000.0-65000000.0-200000.0-30300000.0-243900000.00.00.0-1100000.0-192700000.0-51500000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebtSubsequentAdjustments100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-30
Value-42000000.0-9000000.0-52000000.0-242000000.0-65000000.0-200000.0-30300000.0-243900000.00.00.0-1100000.0-192700000.0-51500000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebtSubsequentAdjustments100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0

us-gaap:AmortizationOfIntangibleAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value8382848587939193794441404146474750576060525260545466676763635958625656606060
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value000000010221110010051114101010812171816
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesGrossRealizedGains



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value4326221812302921144505979113108121177491481339632106821607110710998
Percentage of AvailableForSaleSecuritiesGrossRealizedGains100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesGrossRealizedLosses



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value2091717163236917203065133192556-61-56-87229-6-404165-179054-28
Percentage of AvailableForSaleSecuritiesGrossRealizedLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BenefitsLossesAndExpenses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value2753226309251852401322721228302200921440207572255621307212012101021055202672000718976198131877218457174821809717469172091672917087165851640015054143271435814105143521409313467134351330113737
Percentage of BenefitsLossesAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect



Period End2020-03-312019-03-31
Value408548
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0

us-gaap:CommonStockDividendsPerShareCashPaid



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-10-222013-07-232013-05-152013-02-202013-02-202012-11-062012-12-312012-07-242012-09-302012-05-162012-06-302012-01-242012-01-242012-03-312011-12-312011-09-302011-06-302011-03-31
Value0.950.80.80.80.80.750.750.750.750.70.70.650.650.650.650.650.650.6250.6250.6250.6250.43750.43750.43750.43750.3750.3750.3750.3750.3750.28750.28750.28750.28750.28750.28750.28750.28750.28750.250.250.250.25
Percentage of CommonStockDividendsPerShareCashPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockDividendsPerShareDeclared



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-10-252011-07-262011-09-302011-05-172011-06-302011-02-222011-02-222011-03-31
Value0.950.80000000000000030.80.80.80.750.750.750.750.70000000000000020.70.650.650.65000000000000010.650.650.650.6250.6250.6250.6250.43750.43750.43750.43750.3750.3750.3750.287499999999999870.28750.28750.28750.250.250.250.250.250.250.250.25
Percentage of CommonStockDividendsPerShareDeclared100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredIncomeTaxExpenseBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value57110-1082455-5013953-51-1034-27-52-15745-182673-53-60-2370-7759-368559-12716727594440
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0.00.0-1000000.0-1000000.00.00.0-1000000.0-800000.0-900000.0-2800000.0-2900000.0-2800000.0-2900000.0-3100000.0-3100000.0-3100000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses0.00.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-6000000.0-4000000.0-5000000.0-4000000.0-4000000.0-4000000.0-6000000.0-6000000.0-6000000.0-5500000.0-5400000.0-5500000.0-5400000.0-5800000.0-4500000.0-4300000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses0.00.0500.0400.00.00.0600.0750.0666.7196.4186.2196.4186.2187.1145.2138.7

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-2000000.0-3000000.0-3000000.0-3000000.0-3000000.0-3000000.0-3000000.0-3100000.0-3100000.0-3400000.0-3400000.0-3400000.0-3400000.0-3500000.0-3400000.0-3400000.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0.00.00.00.00.00.0100000.00.0-100000.0-100000.0-100000.0-100000.0-200000.0-200000.0-100000.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit-0.0-0.0-0.0-0.0-0.0-0.0-3.2-0.02.92.92.92.95.75.92.9

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value6566566665555555
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value40343535343737363636363736373636
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets666.7680.0583.3583.3680.0616.7616.7611.7603.3658.9647.4660.7645.6660.7655.4655.4

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanInterestCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value3434444335555555
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value12151516161414131316161616161717
Percentage of DefinedBenefitPlanInterestCost400.0375.0500.0400.0400.0350.0350.0355.3357.9315.4319.2321.2319.2296.4308.9308.9

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-5-4-4-4-4-5-4-4-40000000
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-17-14-11-13-12-31-9-8-8-11-9-10-10-11-11-9
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost340.0350.0275.0325.0300.0620.0225.0202.4202.41983.31357.11716.71528.6-11200.00.0-9100.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-5000000.0-1000000.0-4000000.0-2000000.0-2000000.014000000.0-6000000.0-6600000.0-6600000.0-700000.0-2900000.0-2100000.0-1700000.0-600000.0-1100000.0-3200000.0
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepreciationAmortizationAndAccretionNet



Period End2020-03-312019-03-31
Value270289
Percentage of DepreciationAmortizationAndAccretionNet100.0100.0

us-gaap:DividendsCommonStock



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-31
Value243204208206195195197199180182172172171172172171164164165167118120121124113114-65491949693
Percentage of DividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-31
Value243204208206195195197199180182172172171172172171164164165167118120121124113114-65491949693
Percentage of DividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents



Period End2020-03-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value-21-1-1000011120-12-101-5-2-3000-110-212-1
Percentage of EffectOfExchangeRateOnCashAndCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-710-42-23970000-1000-1000-10-3-4-4-17-15-3-1
Percentage of FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:EquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-710-42-2397
Percentage of FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss100.0100.0100.0100.0100.0100.0100.094.6

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value-8-1-8-1-3-148-239000-1-200110-102-33718-15-300014
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-20-3-3-1001
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings125.0-0.037.5300.033.3-0.00.012.3

us-gaap:EquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-6-1-52-2-147
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings175.0100.062.5-200.066.7100.0100.086.4

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value-10-111202-2-1-205403001-3-3312-2016-225-1-2-4-20
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-10-111202-2-1-3
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss100.0100.0100.00.0100.0100.0100.0107.1

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value3850534442614053275194768811636962102882065393323191810361019193118121216
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2631283033263242
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases68.462.052.868.278.642.680.078.7

us-gaap:EquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1219251472753
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases31.638.047.231.816.744.312.55.6

us-gaap:OtherDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value00002639
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases0.00.00.00.04.89.87.516.9

us-gaap:ResidentialMortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value00000200
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases0.00.00.00.00.03.30.00.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value124228922485114531234118118311555232213210-2-13-21-10-1-14-12-27
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value31191116211
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales25.026.232.111.14.533.340.094.8

us-gaap:EquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value931198213131
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales75.073.867.988.995.564.660.08.6

us-gaap:OtherDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value00000100
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales0.00.00.00.00.02.10.00.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value13181821223730247171816203061010242111325-3-155-1-10-3-6-7-52-6-122-17
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1113181921283023
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements84.672.2100.090.595.575.7100.095.8

us-gaap:OtherDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value24011900
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements15.422.20.04.84.524.30.00.0

us-gaap:ResidentialMortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value01010000
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements0.05.60.04.80.00.00.00.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-06-30
Value13-240347412012469913911130400024025013110181174704
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value13-44000638
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3100.0200.0100.00.00.00.085.790.9

us-gaap:EquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value02000000
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel30.0-100.00.00.00.00.00.00.0

us-gaap:OtherDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value00003414
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel30.0-0.00.00.0100.0100.014.39.6

us-gaap:GainsLossesOnExtinguishmentOfDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-30
Value-1-3001610-19-2820000000722-30-74-3-3-145000
Percentage of GainsLossesOnExtinguishmentOfDebt100.0100.00.00.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:DebtInstrument

us-gaap:ConvertibleDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312015-12-312015-09-302015-06-30
Value-1-30016722
Percentage of GainsLossesOnExtinguishmentOfDebt100.0100.00.00.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value2089109814891453194554312421503178012411181205151565811361448131237411291558156988710871263113088212101287481102510481309478104510071427752113611291335433911171052893
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities



Period End2020-03-312019-03-31
Value588-354
Percentage of IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities100.0100.0

us-gaap:IncreaseDecreaseInDeferredRevenue



Period End2020-03-312019-03-31
Value-10996
Percentage of IncreaseDecreaseInDeferredRevenue100.0100.0

us-gaap:IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value491-244205-4011155085-349536-55074-378659-23172-169507-321
Percentage of IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInInsuranceLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value692432143460791-50353-49-56045720123130571-30381-27220-306-104382110277307545-20970-3685-22-7930968
Percentage of IncreaseDecreaseInInsuranceLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value525-11022133125-70828853391112194117205-797640167117-650227197191-7142063369-8658-112-4437416074
Percentage of IncreaseDecreaseInOtherOperatingAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInReceivables



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value639173291-164753-128252606-36633-746411-2761204-156162170496-772-111429879181223616222397-323-333164302268279
Percentage of IncreaseDecreaseInReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInTradingSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value-63182721-166469371414755-15-6104-6914081212-62111-7
Percentage of IncreaseDecreaseInTradingSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InsuranceServicesRevenue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value2944827132264442517724388233042298022714223422244722096221982231921484211252127420309200231977119758188511877618370182301764417733175971754615271151331517315150151551487914654143081419814843
Percentage of InsuranceServicesRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-3603-2254-1303-572-477-347-330-309
Percentage of InsuranceServicesRevenue-12.2-8.3-4.9-2.3-2.0-1.5-1.4-1.4

us-gaap:ConsolidatedEntities, us-gaap:MajorCustomers

antm:IngenioRxSegment, antm:Affiliated



Period End2020-03-312019-03-31
Value28530
Percentage of InsuranceServicesRevenue9.70.0

antm:OtherSegment, antm:Affiliated



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value75022541303572477347330309
Percentage of InsuranceServicesRevenue2.58.34.92.32.01.51.41.4

us-gaap:MajorCustomers

antm:Unaffiliated



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value294482644425177243882298022715
Percentage of InsuranceServicesRevenue100.0100.0100.0100.0100.0100.0

us-gaap:MajorCustomers, us-gaap:ProductOrService

antm:Unaffiliated, antm:CommercialSpecialty



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value936192849417939289339055
Percentage of InsuranceServicesRevenue31.835.137.438.538.939.9

antm:Unaffiliated, antm:GovernmentBusinessSegment



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value174661595515538149251397913619
Percentage of InsuranceServicesRevenue59.360.361.761.260.860.0

antm:Unaffiliated, antm:IngenioRxSegment



Period End2020-03-312019-03-31
Value23440
Percentage of InsuranceServicesRevenue8.00.0

antm:Unaffiliated, antm:OtherSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2771591120522271646841
Percentage of InsuranceServicesRevenue0.95.94.60.90.30.30.30.2

us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

antm:DentalVisionProductsAndServices, antm:CommercialSpecialtyBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value315327325327323306306303304305305301306
Percentage of InsuranceServicesRevenue1.11.21.21.31.31.31.31.31.41.41.41.41.4

antm:ManagedCareProducts, antm:CommercialSpecialtyBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value7569750575427646761868017377744573638457847886648649
Percentage of InsuranceServicesRevenue25.727.728.530.431.229.232.132.833.037.738.439.038.8

antm:ManagedCareProducts, antm:GovernmentBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value17375161181584715444148191461313695134311315212224119341176611918
Percentage of InsuranceServicesRevenue59.059.459.961.360.862.759.659.158.954.554.053.053.4

antm:ManagedCareServices, antm:CommercialSpecialtyBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1381140213301353136611971334130212821170119612321222
Percentage of InsuranceServicesRevenue4.75.25.05.45.65.15.85.75.75.25.45.65.5

antm:ManagedCareServices, antm:GovernmentBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value919510894174307146112110105103117107
Percentage of InsuranceServicesRevenue0.30.40.40.40.71.30.60.50.50.50.50.50.5

antm:OtherProducts, antm:CommercialSpecialtyBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value969487918512111111111517073110111
Percentage of InsuranceServicesRevenue0.30.30.30.40.30.50.50.50.50.80.30.50.5

antm:Pharmacyproductsandservices, antm:IngenioRxSegment



Period End2020-03-312019-03-31
Value51970
Percentage of InsuranceServicesRevenue17.60.0

us-gaap:StatementBusinessSegments

antm:CommercialSpecialtyBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value93619328928494179392842591289162906610103100521030810289
Percentage of InsuranceServicesRevenue31.834.435.137.438.536.239.740.340.645.045.546.446.1

antm:GovernmentBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value17466162131595515538149931492013841135431326212330120371188312025
Percentage of InsuranceServicesRevenue59.359.860.361.761.564.060.259.659.454.954.553.553.9

antm:IngenioRxSegment



Period End2020-03-312019-03-31
Value51970
Percentage of InsuranceServicesRevenue17.60.0

antm:OtherSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1027384525087943-411181313854
Percentage of InsuranceServicesRevenue3.514.29.53.20.0-0.20.00.00.10.10.00.00.0

antm:SegmentEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-3603-2254-1303-572-477-347-330-309
Percentage of InsuranceServicesRevenue-12.2-8.3-4.9-2.3-2.0-1.5-1.4-1.4

us-gaap:LeaseCost



Period End2020-03-312019-09-302019-06-302019-03-31
Value57535353
Percentage of LeaseCost100.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1374420543193841820412163172341736716667114781825117457167681177216824161341557010626
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

antm:CommercialSpecialtyBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value39086749634963883540611260255699379677577228693545607255664666354582
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear128.432.932.835.129.135.534.734.233.142.541.441.438.743.141.242.643.1

antm:GovernmentBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value9698137941303511816862311122113421096876821049310229983372129569948889346044
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear170.667.167.264.970.964.565.365.866.957.558.658.661.356.958.857.456.9

antm:OtherSegment



Period End2020-03-312019-03-31
Value1380
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear11.00.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value6109532847685414-83303731562768-1387825288992949214619
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

antm:CommercialSpecialtyBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value187564132315176641152318222162-2393082062931293801622
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears130.7120.846.541.032.6-49.450.243.639.591.4172.339.539.094.243.941.335.1

antm:GovernmentBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value4234-111524533648-12415141234055100473322651655412996
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears169.3-20.853.559.067.4149.449.856.460.58.6-72.360.561.05.856.158.764.9

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value2053020475198971948418339169411778117303166251826817703175611717317202165921650015225
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

antm:CommercialSpecialtyBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value57976928654667805498602461685957548878037441726467507365699068936081
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims128.233.832.934.830.035.634.734.433.042.742.041.439.342.842.141.839.9

antm:GovernmentBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value146031354713351127041284110917116131134511137104641026210297104239836960296079144
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims171.166.267.165.270.064.465.365.667.057.358.058.660.757.257.958.260.1

antm:OtherSegment



Period End2020-03-312019-03-31
Value1300
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims10.60.0

us-gaap:LitigationCase, us-gaap:GainContingenciesByNature

us-gaap:LossContingencyDamagesSoughtValue

antm:AnthemInc.v.ExpressScriptsInc., antm:Operational



Period End2020-03-312019-12-312019-09-30
Value15800
Percentage of LossContingencyDamagesSoughtValue100.00.00.0

antm:AnthemInc.v.ExpressScriptsInc., antm:Pharmacypricing



Period End2020-03-312019-12-312019-09-30
Value1480000
Percentage of LossContingencyDamagesSoughtValue9367.10.00.0

us-gaap:OperatingLeaseCost



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value4760484545
Percentage of OperatingLeaseCost100.0100.0100.0100.0100.0

us-gaap:OperatingLeasePayments



Period End2020-03-312019-09-302019-06-302019-03-31
Value44434444
Percentage of OperatingLeasePayments100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value-716-10119237350-87-45-76-256-168711694-26863243147-60-161-19539-52-141108120-15-40429135-6944
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value213403-35-71-98-2421221
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value0000100000000000300-13-100000000
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax0.00.00.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value-712384240363-175-29-62-2072482610696117-89-76-216-23766-161-14114714422-36943174-22120
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value-712384240363-175-29-62-2072482610696117-89-76-216-23766-161-14114714422-36943174-22120
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-06-302012-03-31
Value-71284240363-175-29-62-2072482610696117-89-76-216-23766-161-141147144-36943-22120
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.099.7100.098.4100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value-7-16-4-3-3112-7-7-7-38-4-4-324-3-3-341-5-4-4127-3-3-2-476-666
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-27213-1-7-22-9-4-11079151415833-25-95-2045-21-19-7-35-20-49-31-27-4
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value7-5-11-220-3130-42-8-70-31-18130-102411-7941910-9416142
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value211410-37-73-101-22341663177-6-25-4627-3-32429-123-13148-96-85828011-1881095-1265
Percentage of OtherComprehensiveIncomeLossTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value315-3403322283-4-7917385-17-190-26529-76000-5000000-100-1100-7-70
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value-1-2-20019-10-7-71236-2-301910214215-41000-300000000
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value-689-31116238357-65-36-72-244-17810080-2695209172-62-141-24160-33-13314414016-37734-251168-27107-2028512233-2099
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsPeriodIncreaseDecrease



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value32-21100200000-3-3-95114
Percentage of OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsPeriodIncreaseDecrease100.0100.0100.0100.00.00.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value101171491398471257913153385312626151419111027937173613281141014
Percentage of OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value-440-1-2-3-1-200000-1-1-4-8-18-3-7-4-10-500000000-2-5-2-2-7-8
Percentage of OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities100.00.0100.0100.0100.0100.0100.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities

us-gaap:CorporateDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-30
Value44-21
Percentage of OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities100.0100.0100.0

us-gaap:InvestmentType

us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value44-2113120000
Percentage of OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities100.0100.0100.00.00.00.00.00.00.00.00.0

us-gaap:OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities



Period End2020-03-312019-09-302019-03-312018-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value900251142-3030000-2000-420-400
Percentage of OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0

us-gaap:OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value32-21100200000-3-3-951
Percentage of OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities100.0100.0100.0100.00.00.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value57171371086471257811112566281921141313101026937173510228236
Percentage of OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForLossesAndLossAdjustmentExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1985320596196681897217577171511767117398171051832017319175501706116924164281649215246
Percentage of PaymentsForLossesAndLossAdjustmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

antm:CommercialSpecialtyBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value57836813648167035306615361786018601778206989724366227349677570166205
Percentage of PaymentsForLossesAndLossAdjustmentExpense29.133.133.035.330.235.935.034.635.242.740.441.338.843.441.242.540.7

antm:GovernmentBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value139321378313187122691227110998114931138011088104991032910306104389575965394759041
Percentage of PaymentsForLossesAndLossAdjustmentExpense70.266.967.064.769.864.165.065.464.857.359.658.761.256.658.857.559.3

antm:OtherSegment



Period End2020-03-312019-03-31
Value1380
Percentage of PaymentsForLossesAndLossAdjustmentExpense0.70.0

us-gaap:PaymentsForProceedsFromOtherInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value101171526-888-1-11-3000-1103002600000030-4000134
Percentage of PaymentsForProceedsFromOtherInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.00.0100.00.00.0100.0100.00.00.00.00.00.0100.0100.00.0100.00.0100.0100.0100.0100.0

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value10722278412730034120755
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-12-312012-09-302012-06-302012-03-312011-06-302011-03-31
Value1908000028937613462045330000002-5563500000360487904100
Percentage of PaymentsToAcquireBusinessesNetOfCashAcquired100.00.00.00.00.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.0100.0100.0100.0100.00.00.00.00.00.0100.0100.0100.0100.00.00.0

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value5978546895013934964256533624604214435224393883412492963523942703023703612843114904334723984777901213
Percentage of ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities



Period End2020-03-312019-03-31
Value-176
Percentage of ProceedsFromPaymentsForOtherFinancingActivities100.0100.0

us-gaap:ProceedsFromRepaymentsOfCommercialPaper



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-31
Value905-100-40025178-53649-595-108-511-661-371171912447-147-77-28326858638-425-44110837990260-25940-4837763
Percentage of ProceedsFromRepaymentsOfCommercialPaper100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfAvailableForSaleSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value193128492048198614681967153226532227362033842941351434882921248030622915270332342925325620382560240154112300311734923228
Percentage of ProceedsFromSaleOfAvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromShortTermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-31
Value10751110167520952710382019701825150519851660102011705404404409801005401270850300100680970010025092200100100
Percentage of ProceedsFromShortTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromStockOptionsExercised



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value445037247640383559472647103281920501614451093285521301292324348354769
Percentage of ProceedsFromStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RepaymentsOfShortTermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value700112019752180276039451820183016551890106098010705404405409801005401180800025010207800019210010010000100
Percentage of RepaymentsOfShortTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.00.0100.0100.0100.0100.00.00.0100.0

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability



Period End2020-03-312019-09-302019-03-31
Value323330
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability100.0100.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value272.03-0.25-0.9499999999999886-0.5099999999999909307.590.459999999999979541.460000000000008-0.3400000000000034232.150.81999999999999326.33000000000001250.3499999999999943166.94-0.06999999999999318-0.0200000000000102320.06999999999999318131.83-0.219999999999998860.120000000000004550.25146.850.15999999999999660.200000000000002840.739999999999994989.430.370000000000004550.229999999999996870.649999999999998661.81
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-31
Value0.00350.00740.00.00.00260.009770.00.00.003230.012030.00.00.003970.015090.00.00.004910.0127500000000000010.00.00.004250.0150.00.00.0050.00.0060.0120.00.00.0040.00379
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.00.0100.0100.00.00.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value0.260.00.00.00.250.00.00.00.30.00.00.00.320.00.00.00.320.00.00.00.310.00.00.00.350.00.350.00.00.00.340.340.34
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.0100.00.00.00.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value0.0130.00.00.00.02690.00.00.00.0290.00.00.00.02310.00.00.00.01760.00.00.00.01960.00.00.00.02160.00.01250.00.00.00.01410.02840.0309
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.0100.00.00.00.0100.0100.0100.0

us-gaap:AwardType, antm:Performancemeasurementperiod

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross

us-gaap:RestrictedStockUnitsRSU, antm:A2017to2019



Period End2020-03-31
Value600000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross100.0

us-gaap:RestrictedStockUnitsRSU, antm:A2020to2022



Period End2020-03-31
Value200000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross33.3

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-31
Value54.03-0.030000000000001137-0.10999999999999943-0.1200000000000045568.920.039999999999999150.1699999999999946-0.0399999999999991555.310.039999999999999150.070000000000000280.0400000000000062540.73-0.0100000000000015630.00.01999999999999957430.55-0.050000000000004260.0100000000000051160.0599999999999951733.950.0100000000000015630.0299999999999975840.170000000000001722.20.01999999999999957414.51-0.010000000000001563-0.0199999999999995740.01999999999999957416.5117.78
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShortTermLeaseCost



Period End2020-03-312019-09-302019-06-302019-03-31
Value1391212
Percentage of ShortTermLeaseCost100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:CommonStock



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value100100010001000100020102
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value3120916912695692886688899636361606053871067413889142173485383404768
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-09-302012-06-302012-03-312011-03-312010-03-31
Value3120916912695692886688899636361606053871067413889142173485383404768
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchasedAndRetiredDuringPeriodShares



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-02-082012-02-092011-03-312010-03-31
Value1121111111520004525814041120
Percentage of StockRepurchasedAndRetiredDuringPeriodShares100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:CommonStock



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312011-03-312010-03-31
Value1211111115200045258141120
Percentage of StockRepurchasedAndRetiredDuringPeriodShares100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-02-082012-02-092011-03-312010-03-31
Value52930564445829449339740139436211264585001056367743435788141262643337411388
Percentage of StockRepurchasedAndRetiredDuringPeriodValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312011-03-312010-03-31
Value7190707169586056602018410024145212105187-62884387708
Percentage of StockRepurchasedAndRetiredDuringPeriodValue13.414.015.324.114.014.615.014.316.617.918.420.70.023.322.827.430.832.4-7.670.052.251.0

us-gaap:RetainedEarnings



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312011-03-312010-03-31
Value45855438822342433934133830292537340080491561237391876378354679
Percentage of StockRepurchasedAndRetiredDuringPeriodValue86.686.084.775.986.085.485.085.783.482.181.679.30.076.777.272.569.267.6107.630.047.849.0

us-gaap:SubleaseIncome



Period End2020-03-312019-09-302019-06-302019-03-31
Value3444
Percentage of SubleaseIncome100.0100.0100.0100.0

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value2123020538199201944318794170051784217462172711836617819177181796817280166391647315979
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

antm:CommercialSpecialtyBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value60906956652667655695605561866027582578517447733970847404699668766520
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense28.733.932.834.830.335.634.734.533.742.741.841.439.442.942.041.740.8

antm:GovernmentBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value150101358213394126781309910950116551143511445105151037110378108849875964295979459
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense70.766.167.265.269.764.465.365.566.357.358.258.660.657.158.058.359.2

antm:OtherSegment



Period End2020-03-312019-03-31
Value1300
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense0.60.0

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value7006323-414556461159645981151567947746-27754
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

antm:CommercialSpecialtyBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value29328-20-1519731186933747674334385-17439
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense41.944.4-87.036.643.348.430.443.552.247.95.847.942.050.012.562.558.2

antm:GovernmentBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value4073543-2625833429030851108814603840-10314
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense58.155.6187.063.456.751.669.656.547.852.194.252.158.050.087.537.541.8

us-gaap:SupplementaryInsuranceInformationOtherOperatingExpense



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value959856884943404424420399355368329304
Percentage of SupplementaryInsuranceInformationOtherOperatingExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value4445557666455711131197732334455445
Percentage of WeightedAverageNumberDilutedSharesOutstandingAdjustment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:AccumulatedOtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value-4-3-4-3-3-3-2-2-1-2-2-3-4-6-7-8-7-9-8-8-9-4-2122
Percentage of AccumulatedOtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:AvailableForSaleSecuritiesAccumulatedOtherComprehensiveIncomeNetDeferredTaxLiability



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value51-155-164-130-61392415-4-301-309-304-245-206-364-358-223-124-157-241-375-330-345-425-345-267
Percentage of AvailableForSaleSecuritiesAccumulatedOtherComprehensiveIncomeNetDeferredTaxLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value489487500493482486501489504556524516556524522493494550563613523500455
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:AvailableForSaleSecuritiesOtherThanTemporaryImpairmentsInAccumulatedOtherComprehensiveIncomeDeferredTaxLiabilityAsset



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value10111110000000-24-9-6-5-4-20-2-2000
Percentage of AvailableForSaleSecuritiesOtherThanTemporaryImpairmentsInAccumulatedOtherComprehensiveIncomeDeferredTaxLiabilityAsset100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

antm:CashFlowHedgingInstrumentsAccumulatedOtherComprehensiveIncomeNetDeferredTaxAsset



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value6869636565656666671251271248890298289186435918181919161717
Percentage of CashFlowHedgingInstrumentsAccumulatedOtherComprehensiveIncomeNetDeferredTaxAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:DeferredNetActuarialGainLossPostretirementBenefits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value-25000000.0-25000000.0-57000000.0-57000000.0-57000000.0-58000000.0-75000000.0-75700000.0-76600000.0-77500000.0-138000000.0-140900000.0-143700000.0-146600000.0-153400000.0-156500000.0-159600000.0-162700000.0-199800000.0-203600000.0-194800000.0-211200000.0-150000000.0-152400000.0-154700000.0-169600000.0
Percentage of DeferredNetActuarialGainLossPostretirementBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:DeferredPriorServiceCostCreditPostretirementBenefitPlans



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value181925283134373942464952-56-59-63-66-70-73-77-80-71-88-79-82-86-102
Percentage of DeferredPriorServiceCostCreditPostretirementBenefitPlans100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeAdjustmentsNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value539547543-549-554559-435-445-454381-385-390394399373376380384323328333338243246250254
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeAdjustmentsNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetDeferredTaxAsset



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value-185000000.0-188000000.0-188000000.0-190000000.0-191000000.0-193000000.0-153000000.0-155500000.0-158800000.0-244100000.0-248400000.0-251600000.0-254800000.0-257200000.0-243000000.0-245100000.0-247800000.0-250400000.0-213400000.0-217100000.0-220300000.0-223200000.0-162300000.0-164800000.0-167500000.0-169900000.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetDeferredTaxAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:EquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value570103923291525124415262306246823743632
Percentage of EquitySecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:FairValueInputsLevel1, antm:CommonEquitySecurities, us-gaap:EquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value223679644601
Percentage of EquitySecurities0.422.734.22.939.4

us-gaap:FairValueInputsLevel1, us-gaap:ExchangeTradedFunds, us-gaap:EquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value245445635102
Percentage of EquitySecurities43.04.224.233.40.1

us-gaap:FairValueInputsLevel2, antm:CommonEquitySecurities, us-gaap:EquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value3031333353
Percentage of EquitySecurities5.33.01.42.23.5

us-gaap:FairValueInputsLevel2, antm:FixedMaturityMutualFunds, us-gaap:EquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value211643631633557
Percentage of EquitySecurities37.061.927.141.536.5

us-gaap:FairValueInputsLevel3, us-gaap:PrivateEquityFunds, us-gaap:EquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value8285306305313
Percentage of EquitySecurities14.48.213.120.020.5

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:InvestmentType

us-gaap:FairValueInputsLevel1, us-gaap:EquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value24728013595543176031295146513462446
Percentage of EquitySecurities43.326.958.436.325.539.556.259.456.767.4

us-gaap:FairValueInputsLevel2, us-gaap:EquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value241674664666630610693690724897
Percentage of EquitySecurities42.364.928.543.750.640.030.128.030.524.7

us-gaap:FairValueInputsLevel3, us-gaap:EquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value8285306305297313318312303287
Percentage of EquitySecurities14.48.213.120.023.920.513.812.612.87.9

us-gaap:FinancialInstrument

antm:CommonEquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value3226782977654
Percentage of EquitySecurities5.625.735.65.042.9

antm:FixedMaturityMutualFunds



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value211643631633557
Percentage of EquitySecurities37.061.927.141.536.5

us-gaap:ExchangeTradedFunds



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value245445635102
Percentage of EquitySecurities43.04.224.233.40.1

us-gaap:PrivateEquityFunds



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value8285306305313
Percentage of EquitySecurities14.48.213.120.020.5

us-gaap:FinancialInstrument, us-gaap:InvestmentType

antm:CommonEquitySecurities, us-gaap:EquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value3226782977654
Percentage of EquitySecurities5.625.735.65.042.9

antm:FixedMaturityMutualFunds, us-gaap:EquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value211643631633557
Percentage of EquitySecurities37.061.927.141.536.5

us-gaap:ExchangeTradedFunds, us-gaap:EquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value245445635102
Percentage of EquitySecurities43.04.224.233.40.1

us-gaap:PrivateEquityFunds, us-gaap:EquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value8285306305313
Percentage of EquitySecurities14.48.213.120.020.5

us-gaap:InvestmentType

us-gaap:EquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value570103923291525124415262306246823743632
Percentage of EquitySecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpensePurchaseAdjustments



Period End2020-03-312018-12-312018-09-302018-06-302018-03-312017-12-312015-12-312014-12-312013-12-312012-12-31
Value3391991991991997512100804
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpensePurchaseAdjustments100.0100.0100.0100.0100.0100.0100.00.00.0100.0

us-gaap:StatementBusinessSegments

antm:GovernmentBusinessSegment



Period End2020-03-312018-12-312018-09-302018-06-302018-03-312017-12-312015-12-31
Value14119919919919975121
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpensePurchaseAdjustments41.6100.0100.0100.0100.0100.0100.0

antm:OtherSegment



Period End2020-03-31
Value198
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpensePurchaseAdjustments58.4

us-gaap:SubsequentEventType

antm:PatientProtectionAffordableCareActHealthInsuranceProviderFee

us-gaap:SubsequentEvent



Period End2020-12-31
Value15523
Percentage of PatientProtectionAffordableCareActHealthInsuranceProviderFee100.0

antm:SelfFundedReceivablesNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value261324112555253424912278263126502579
Percentage of SelfFundedReceivablesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:SelffundedReceivablesAllowanceForDoubtfulAccounts



Period End2020-03-312019-12-312018-12-312018-09-302018-06-302017-12-31
Value5546474052153
Percentage of SelffundedReceivablesAllowanceForDoubtfulAccounts100.0100.0100.0100.0100.0100.0

antm:ShortDurationContractLiabilityForClaimsAdjustmentExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value969086478770854980287266746873607453781476567360
Percentage of ShortDurationContractLiabilityForClaimsAdjustmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

antm:CommercialSpecialtyBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value307630392918285927762586267727162774338332473371
Percentage of ShortDurationContractLiabilityForClaimsAdjustmentExpense31.735.133.333.434.635.635.836.937.243.342.445.8

antm:GovernmentBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value642456085852569052524680479146444679443144093989
Percentage of ShortDurationContractLiabilityForClaimsAdjustmentExpense66.364.966.766.665.464.464.263.162.856.757.654.2

antm:OtherSegment



Period End2020-03-312019-12-312019-03-312018-12-31
Value190000
Percentage of ShortDurationContractLiabilityForClaimsAdjustmentExpense2.00.00.00.0

antm:ShortdurationcontractliabilityforunpaidclaimsandadjustmentexpenseNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value963086148735850679947232743173257419770971176714
Percentage of ShortdurationcontractliabilityforunpaidclaimsandadjustmentexpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

antm:CommercialSpecialtyBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value303930252910284527682576266727122772330527262735
Percentage of ShortdurationcontractliabilityforunpaidclaimsandadjustmentexpenseNet31.635.133.333.434.635.635.937.037.442.938.340.7

antm:GovernmentBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value640155895825566152264656476446134647440443913979
Percentage of ShortdurationcontractliabilityforunpaidclaimsandadjustmentexpenseNet66.564.966.766.665.464.464.163.062.657.161.759.3

antm:OtherSegment



Period End2020-03-312019-03-31
Value1900
Percentage of ShortdurationcontractliabilityforunpaidclaimsandadjustmentexpenseNet2.00.0

us-gaap:AccruedInvestmentIncomeReceivable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value166173168168161162163161160162158158149164169168171170176168173161172168173168175172172162164164167172178179171177172
Percentage of AccruedInvestmentIncomeReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value-168521552436197-159-95-5714533550542441361630625415243305446688627660793649509476460838803862693720613593
Percentage of AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value5424221918282625195353535254545454737474744241-4140-394-399-406-53-366-373-379-70-65
Percentage of AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-312009-12-31
Value-3-2-3-2-2-2-2-10-1-1-2-2-4-5-5-4-6-5-5-6-2-111100000-10001
Percentage of AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value44354332000001712261815135165000000-3-3-3-2109
Percentage of AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value342432220000014717111083043000000-2-2-2-166
Percentage of AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxDebtSecurities100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulOtherReceivablesCurrent



Period End2020-03-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value282242280305197301142115
Percentage of AllowanceForDoubtfulOtherReceivablesCurrent100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AociLossCashFlowHedgeCumulativeGainLossAfterTax



Period End2020-03-312019-03-31
Value-259-243
Percentage of AociLossCashFlowHedgeCumulativeGainLossAfterTax100.0100.0

us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:CashFlowHedging



Period End2020-03-312019-12-31
Value259262
Percentage of AociLossCashFlowHedgeCumulativeGainLossAfterTax-100.00.0

us-gaap:AssetsFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value2379423624245652369821161
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value26102308262725062755
Percentage of AssetsFairValueDisclosure11.09.810.710.613.0

us-gaap:FairValueInputsLevel2



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value2077920919213072057617783
Percentage of AssetsFairValueDisclosure87.388.586.786.884.0

us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value405397631616623
Percentage of AssetsFairValueDisclosure1.71.72.62.62.9

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value202111902119267185771755016894175041715217070170541826918560176941699117593179571805716950178071802117120
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value5107207706263791731701992399399409418117481068815
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:CommercialMortgageBackedSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value12330
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax0.20.30.40.50.0

us-gaap:CorporateDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value14833934126333
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax29.047.144.342.019.1

us-gaap:OtherAggregatedInvestments, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value621242314
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax1.22.93.13.78.1

us-gaap:ResidentialMortgageBackedSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value93871118631
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax18.212.114.413.717.9

us-gaap:USGovernmentAgenciesDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value2441083
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax4.70.61.31.31.7

us-gaap:USGovernmentSponsoredEnterprisesDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value55661
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax1.00.70.81.00.6

us-gaap:USStatesAndPoliticalSubdivisions, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value23326227523791
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax45.736.435.737.952.6

us-gaap:InvestmentType

us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value510720770626379173170199239414501470341
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.044.153.249.945.6

us-gaap:AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-09-302014-06-30
Value-219676716566258-198-119-7318834860846686567994984638367463688106310051219
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value7294454601213712892732201048095124180
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:AvailableForSaleSecuritiesAmortizedCost

us-gaap:CommercialMortgageBackedSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value8184878769
Percentage of AvailableForSaleSecuritiesAmortizedCost100.0100.0100.0100.0100.0

us-gaap:CorporateDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value96098870904087128189
Percentage of AvailableForSaleSecuritiesAmortizedCost11863.010559.510390.810013.811868.1

us-gaap:OtherAggregatedInvestments, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value16921648164516451115
Percentage of AvailableForSaleSecuritiesAmortizedCost2088.91961.91890.81890.81615.9

us-gaap:ResidentialMortgageBackedSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value37313654391436462769
Percentage of AvailableForSaleSecuritiesAmortizedCost4606.24350.04498.94190.84013.0

us-gaap:USGovernmentAgenciesDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value450524487409414
Percentage of AvailableForSaleSecuritiesAmortizedCost555.6623.8559.8470.1600.0

us-gaap:USGovernmentSponsoredEnterprisesDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value369136125171108
Percentage of AvailableForSaleSecuritiesAmortizedCost455.6161.9143.7196.6156.5

us-gaap:USStatesAndPoliticalSubdivisions, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value47684592446944004716
Percentage of AvailableForSaleSecuritiesAmortizedCost5886.45466.75136.85057.56834.8

us-gaap:InvestmentType

us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value20700195081976719070180321738018005176421757417610187931907717516
Percentage of AvailableForSaleSecuritiesAmortizedCost25555.623223.822720.721919.50.025188.40.00.00.00.00.00.00.0

us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss

us-gaap:CommercialMortgageBackedSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value10012
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss100.00.00.0100.0100.0

us-gaap:CorporateDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value44152531115
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss4400.00.00.03100.05750.0

us-gaap:OtherAggregatedInvestments, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value145545
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss1400.00.00.0400.0250.0

us-gaap:ResidentialMortgageBackedSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value734847
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss700.00.00.0800.02350.0

us-gaap:USGovernmentAgenciesDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value00001
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss0.00.00.00.050.0

us-gaap:USGovernmentSponsoredEnterprisesDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value00001
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss0.00.00.00.050.0

us-gaap:USStatesAndPoliticalSubdivisions, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value001119
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss0.00.00.0100.0950.0

us-gaap:InvestmentType

us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value6623354596190129625436322242
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss6600.00.00.04500.00.09500.00.00.00.00.00.00.00.0

us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss

us-gaap:CommercialMortgageBackedSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value30000
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss100.00.00.00.00.0

us-gaap:CorporateDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value45091715170
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss15000.00.00.00.00.0

us-gaap:OtherAggregatedInvestments, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value973228
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss3233.30.00.00.00.0

us-gaap:ResidentialMortgageBackedSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value956423
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss3166.70.00.00.00.0

us-gaap:USGovernmentAgenciesDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value03000
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss0.00.00.00.00.0

us-gaap:USGovernmentSponsoredEnterprisesDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value480000
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss1600.00.00.00.00.0

us-gaap:USStatesAndPoliticalSubdivisions, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value143103
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss466.70.00.00.00.0

us-gaap:InvestmentType

us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value70724241928184160210166503151127
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss23566.70.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue

us-gaap:CommercialMortgageBackedSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value2933011
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue100.0100.0100.00.0100.0

us-gaap:CorporateDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value50035587116424503
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue17251.718600.023700.00.040936.4

us-gaap:OtherAggregatedInvestments, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1175415483468599
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue4051.713833.316100.00.05445.5

us-gaap:ResidentialMortgageBackedSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1182635422227383
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue4075.921166.714066.70.03481.8

us-gaap:USGovernmentAgenciesDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value0250495547
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue0.08333.31633.30.0427.3

us-gaap:USGovernmentSponsoredEnterprisesDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value224125011
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue772.4400.0166.70.0100.0

us-gaap:USStatesAndPoliticalSubdivisions, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value5093061088295
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue1755.210200.03600.00.02681.8

us-gaap:InvestmentType

us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value8122217917811400170058498792926283124778353444745987
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue28006.972633.359366.70.00.053172.70.00.00.00.00.00.00.0

us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue

us-gaap:CommercialMortgageBackedSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value688837
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue100.0100.0100.0100.0100.0

us-gaap:CorporateDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1762865099342072
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue2933.33575.06362.511675.05600.0

us-gaap:OtherAggregatedInvestments, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value142358332345237
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue2366.74475.04150.04312.5640.5

us-gaap:ResidentialMortgageBackedSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value572373236681458
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue950.02962.54037.58350.03940.5

us-gaap:USGovernmentAgenciesDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value01142079
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue0.012.5175.0250.0213.5

us-gaap:USGovernmentSponsoredEnterprisesDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value011731
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue0.012.512.587.583.8

us-gaap:USStatesAndPoliticalSubdivisions, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value41113601032
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue66.7137.5162.5750.02789.2

us-gaap:InvestmentType

us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value385902120020424418494628601290119812971127484816
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue6416.711275.015000.025525.00.013367.60.00.00.00.00.00.00.0

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value198811967619960191231779516692173901708117091173771869718948179491716318218185631835516920178981823618804174671828418329180041703817538176791781916912184851720616196159131647916462157611606915696
Percentage of AvailableForSaleSecuritiesDebtSecuritiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value505505518509492487496487501560533524560524538512507558569613529504501506502449437460468431244247245246267223220221230
Percentage of AvailableForSaleSecuritiesDebtSecuritiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear

us-gaap:CommercialMortgageBackedSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value14.01.01.00.06.0
Percentage of AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear100.0100.0100.00.0100.0

us-gaap:CorporateDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value2773.0386.0455.0406.02185.0
Percentage of AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear19807.138600.045500.00.036416.7

us-gaap:OtherAggregatedInvestments, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value520.0166.0190.0131.0193.0
Percentage of AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear3714.316600.019000.00.03216.7

us-gaap:ResidentialMortgageBackedSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value603.0321.0228.087.0259.0
Percentage of AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear4307.132100.022800.00.04316.7

us-gaap:USGovernmentAgenciesDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1.027.08.04.05.0
Percentage of AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear7.12700.0800.00.083.3

us-gaap:USGovernmentSponsoredEnterprisesDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value278.014.06.00.08.0
Percentage of AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear1985.71400.0600.00.0133.3

us-gaap:USStatesAndPoliticalSubdivisions, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value239.0114.066.07.0177.0
Percentage of AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear1707.111400.06600.00.02950.0

us-gaap:InvestmentType

us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value4428.01029.0954.0635.0826.02833.04198.04270.03825.02127.01510.02104.02878.0
Percentage of AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear31628.6102900.095400.00.00.047216.70.00.00.00.00.00.00.0

us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear

us-gaap:CommercialMortgageBackedSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value3.04.04.04.019.0
Percentage of AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear100.0100.0100.0100.0100.0

us-gaap:CorporateDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value170.0224.0338.0564.01220.0
Percentage of AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear5666.75600.08450.014100.06421.1

us-gaap:OtherAggregatedInvestments, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value58.0113.0107.0116.093.0
Percentage of AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear1933.32825.02675.02900.0489.5

us-gaap:ResidentialMortgageBackedSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value63.0189.0215.0420.0816.0
Percentage of AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear2100.04725.05375.010500.04294.7

us-gaap:USGovernmentAgenciesDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value0.02.05.08.025.0
Percentage of AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear0.050.0125.0200.0131.6

us-gaap:USGovernmentSponsoredEnterprisesDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1.03.03.013.024.0
Percentage of AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear33.375.075.0325.0126.3

us-gaap:USStatesAndPoliticalSubdivisions, us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value3.014.016.048.0604.0
Percentage of AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear100.0350.0400.01200.03178.9

us-gaap:InvestmentType

us-gaap:FixedMaturities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value298.0549.0688.01173.02456.02801.01499.0835.0774.0814.0648.0272.0425.0
Percentage of AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear9933.313725.017200.029325.00.014742.10.00.00.00.00.00.00.0

us-gaap:CashAndCashEquivalentsFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value23632015125819382551181518282626154219564126262534711546672598666701551686665573632622643728130992912671675143712341374
Percentage of CashAndCashEquivalentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-12-312010-12-31
Value2363201512581938255118151828262615421956412626253471154667259866670155168666557359167961263272816751374
Percentage of CashAndCashEquivalentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.0

us-gaap:CommercialPaper



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value1305400500900697379794921831570829789837
Percentage of CommercialPaper100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1305400500900697
Percentage of CommercialPaper100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsNonrecurring



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1305400500900697
Percentage of CommercialPaper100.0100.0100.0100.0100.0

us-gaap:LongtermDebtType

us-gaap:CommercialPaper



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value1305400500900875697750996958031315197623486295044576046829656970
Percentage of CommercialPaper100.0100.0100.0100.00.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ConvertibleDebtNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-312015-12-312015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-31
Value6801458931042191260334330469976974972970968966186716381613
Percentage of ConvertibleDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument

us-gaap:ConvertibleDebt



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-30
Value136179179181239254253336335334333332331438
Percentage of ConvertibleDebtNoncurrent20.020.017.20.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value68090489310421030
Percentage of ConvertibleDebtNoncurrent100.0623.4100.0100.0539.3

us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsNonrecurring



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value136145179179191
Percentage of ConvertibleDebtNoncurrent20.0100.020.017.2100.0

us-gaap:CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption



Period End2020-03-312020-01-012019-03-312019-01-012018-12-312018-01-01
Value-35-35262626320
Percentage of CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-03-312018-12-312017-12-31
Value-352691320
Percentage of CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption100.0100.0350.00.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLoss



Period End2020-03-312019-12-31
Value510
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLoss100.00.0

us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:CorporateDebtSecurities, us-gaap:FixedMaturities



Period End2020-03-312019-12-31
Value-510
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLoss-100.00.0

us-gaap:InvestmentType

us-gaap:FixedMaturities



Period End2020-03-312019-12-31
Value-510
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLoss-100.00.0

us-gaap:DeferredIncomeTaxLiabilitiesNet



Period End2020-03-312019-12-31
Value22132227
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value2287761098123434343435-35-35-35-48-48-48-48-28-272727256259264342492542584844
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsUnrealizedCurrencyLosses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value111111000001122-3-2-3-2-3-3-10000000000000
Percentage of DeferredTaxAssetsUnrealizedCurrencyLosses100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-312009-12-31
Value-724-734-730-738-744-751-587-599-612-624-632-641-648-655-615-621-628-635-538-547-556-563-424-425-426-427-654-662-674-686-620-631-642-653-460-555
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-312009-12-31
Value011111111100000000-1-1-2-2-18-138-3333-3444456
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsSoldUnderAgreementsToRepurchaseMaturityPeriods

us-gaap:DepositsReceivedForSecuritiesLoanedAtCarryingValue

us-gaap:MaturityOvernight



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value42735146556459060474162461144889712021161995126513971338125114351646
Percentage of DepositsReceivedForSecuritiesLoanedAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsSoldUnderAgreementsToRepurchaseMaturityPeriods, us-gaap:FinancialInstrument

us-gaap:MaturityOvernight, us-gaap:Cash



Period End2020-03-312019-12-31
Value354291
Percentage of DepositsReceivedForSecuritiesLoanedAtCarryingValue82.982.9

us-gaap:MaturityOvernight, us-gaap:OtherAggregatedInvestments



Period End2020-03-312019-12-31
Value41
Percentage of DepositsReceivedForSecuritiesLoanedAtCarryingValue0.90.3

us-gaap:MaturityOvernight, us-gaap:USGovernmentAgenciesDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-30
Value695913242
Percentage of DepositsReceivedForSecuritiesLoanedAtCarryingValue16.216.828.47.4

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:InvestmentType

us-gaap:DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement

us-gaap:FairValueInputsLevel2, us-gaap:Derivative



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value4923252415161011337311758
Percentage of DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentType

us-gaap:Derivative



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value4923252415161011337311758
Percentage of DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:InvestmentType

us-gaap:DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement

us-gaap:FairValueInputsLevel2, us-gaap:Derivative



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value5111512172117242179382241
Percentage of DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentType

us-gaap:Derivative



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value5111512172117242179382241
Percentage of DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNi



Period End2020-03-312019-12-312018-12-31
Value57010091493
Percentage of EquitySecuritiesFvNi100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value4053976316166146236466465825375275204894814724074113152472552232022002471961771961931611551601671392842882883633883173263533513577
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value316303311297297287307304260229239
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue78.076.349.348.248.446.147.547.044.742.649.6

us-gaap:EquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value8285306305297313318312303287188
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue20.221.448.549.548.450.249.248.352.053.439.1

us-gaap:OtherDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value57111114171726141643
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue1.21.81.71.82.32.72.64.02.43.08.9

us-gaap:ResidentialMortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value223366455511
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue0.50.50.50.51.01.00.60.80.90.92.3

us-gaap:ShortTermDebtType

us-gaap:FederalHomeLoanBankAdvancesMaturitiesSummaryDueInNextRollingTwelveMonths

us-gaap:FederalHomeLoanBankAdvances



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-30
Value775650560710695645820670675825580540440440540540540
Percentage of FederalHomeLoanBankAdvancesMaturitiesSummaryDueInNextRollingTwelveMonths100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialLiabilitiesFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value5111517
Percentage of FinancialLiabilitiesFairValueDisclosure100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel2



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value5111517
Percentage of FinancialLiabilitiesFairValueDisclosure100.0100.0100.0100.0100.0

us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value99028842897787588242745476587545764079917963796979207892747274987403756971107177717768616794694567076127611761586215617455235415540354895459534150704852545061845788
Percentage of LiabilityForClaimsAndClaimsAdjustmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

antm:CommercialSpecialtyBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-31
Value30763039291828592776258627402742280134063424336333123267310430843124339635413129
Percentage of LiabilityForClaimsAndClaimsAdjustmentExpense31.134.432.532.633.734.735.836.336.742.643.042.241.841.441.541.142.244.951.651.1

antm:GovernmentBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-31
Value66365803605958995466486849184802483945844539460646074625436844134278417333192997
Percentage of LiabilityForClaimsAndClaimsAdjustmentExpense67.065.667.567.466.365.364.263.763.357.457.057.858.258.658.558.957.855.148.448.9

antm:OtherSegment



Period End2020-03-31
Value190
Percentage of LiabilityForClaimsAndClaimsAdjustmentExpense1.9

us-gaap:LiabilityForFuturePolicyBenefits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value754674661655719706669644666647618619673666646625653631616607684671655643738723701687770750723696752730703638642646664
Percentage of LiabilityForFuturePolicyBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value96308614873585067994723276207510760578867862747774667353707569116902692460936103614754724819542061245727
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

antm:CommercialSpecialtyBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-31
Value30393025291028452768257627292738279933283345289328732745272925132636276027783108
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet31.635.133.333.434.635.635.836.536.842.242.538.738.537.338.636.438.239.945.650.9

antm:GovernmentBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-31
Value64015589582556615226465648914771480645584517458345934607434643984266416333142995
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet66.564.966.766.665.464.464.263.563.257.857.561.361.562.761.463.661.860.154.449.1

antm:OtherSegment



Period End2020-03-312019-12-312018-12-31
Value19000
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet2.00.00.0

us-gaap:CreditFacility, us-gaap:DebtInstrument

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

antm:A5YearFacility, us-gaap:RevolvingCreditFacility



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value25002500250025003500
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity100.0100.0100.0100.0100.0

us-gaap:ShortTermDebtType

us-gaap:LineOfCredit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value500600600600600600500450450450450
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity20.024.024.024.017.10.00.00.00.00.00.0

us-gaap:Range

us-gaap:LossContingencyEstimateOfPossibleLoss

srt:Maximum



Period End2020-03-312019-12-312019-09-302019-06-30
Value800750700250
Percentage of LossContingencyEstimateOfPossibleLoss100.0100.0100.0100.0

us-gaap:NotesPayable



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value2034320470201981834917145
Percentage of NotesPayable100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value2034320470201981834917145
Percentage of NotesPayable100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsNonrecurring



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1886718840188411720717178
Percentage of NotesPayable92.792.093.393.8100.2

us-gaap:BalanceSheetLocation

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherCurrentLiabilities



Period End2020-03-312019-03-31
Value195158
Percentage of OperatingLeaseLiabilityCurrent100.0100.0

us-gaap:BalanceSheetLocation

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OtherNoncurrentLiabilities



Period End2020-03-312019-03-31
Value801482
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent



Period End2020-03-312019-09-302019-06-302019-03-31
Value0.03570.03960.0390.0397
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent100.0100.0100.0100.0

us-gaap:OtherLongTermInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value41814228391437193710372635723495346033432442235222872240215520882078204118381803171816951691167815931542151615101482138712361191104110031004945911865775
Percentage of OtherLongTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value41814228391437193726
Percentage of OtherLongTermInvestments100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsNonrecurring



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value41814228391437193726
Percentage of OtherLongTermInvestments100.0100.0100.0100.0100.0

us-gaap:OtherPolicyholderFunds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value325230502503258625772590292930092918295024712447231122212092239023762256249327412782262625982190202020732322228823592345222922772257227820001955200319091617
Percentage of OtherPolicyholderFunds100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherReceivables



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value292626342870263326392558237421822305226621302525244525362016212522002421215723682549211716801333123410631018994928928847935943943991909916878879
Percentage of OtherReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PremiumsReceivableAllowanceForDoubtfulAccounts



Period End2020-03-312019-12-312018-12-312018-09-302018-06-302017-12-31
Value234237278312281302
Percentage of PremiumsReceivableAllowanceForDoubtfulAccounts100.0100.0100.0100.0100.0100.0

us-gaap:PremiumsReceivableAtCarryingValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value578651734782475150494465431242683605
Percentage of PremiumsReceivableAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-31
Value603335433434373534104539645767
Percentage of ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

antm:CommercialSpecialtyBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-31
Value3714814810104278521635762
Percentage of ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments61.742.422.932.623.529.427.011.45.974.496.798.599.4

antm:GovernmentBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-31
Value231927292624273132261794
Percentage of ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments38.357.677.167.476.570.673.088.694.125.63.31.50.6

us-gaap:RestrictedCashAndInvestmentsCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value2212152422632622222432172309111016616715783174113122
Percentage of RestrictedCashAndInvestmentsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SecuritiesHeldAsCollateralAtFairValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value42635346556559160474162461245590712141234107913601512145513001518171820231515969564871900
Percentage of SecuritiesHeldAsCollateralAtFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-12-312010-12-31
Value0000031440847343321457585774072681882187470884194311138087681253532408231422355
Percentage of SecuritiesHeldAsCollateralAtFairValue0.00.00.00.00.052.055.175.970.947.063.570.660.067.260.254.360.154.555.454.955.053.30.00.00.042.141.048.539.5

us-gaap:FairValueInputsLevel2



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-12-312010-12-31
Value426353465565591290333150178241331357494353541691581592677775909706930693793561332449544
Percentage of SecuritiesHeldAsCollateralAtFairValue100.0100.0100.0100.0100.048.044.924.129.153.036.529.440.032.839.845.739.945.544.645.145.046.70.00.00.057.959.051.560.5

us-gaap:SecuritiesLoanedFairValueOfCollateral



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value427351465564590604741624611454906121312331078135915121455130015181515
Percentage of SecuritiesLoanedFairValueOfCollateral100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value111111111221122222223333344442333433344
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value271.0242.47240.92240.31239.4183.32182.57180.9180.43152.2151.64146.49145.67127.68126.69126.38123.29101.66100.91100.4598.6475.6373.7173.4672.5163.8363.563.3263.0663.8765.2965.2164.9956.054.9654.7454.5544.7136.02
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShortTermBorrowings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value107570071010101095114512701120112512751180580540440440440540540540540450400100250590400350350350250192200100100100100100100
Percentage of ShortTermBorrowings100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value107570071010101145
Percentage of ShortTermBorrowings100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsNonrecurring



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value107570071010101145
Percentage of ShortTermBorrowings100.0100.0100.0100.0100.0

us-gaap:ShortTermDebtType

us-gaap:LineOfCredit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value30050150300400500450450450450450
Percentage of ShortTermBorrowings27.97.121.129.736.543.735.440.240.035.338.1

us-gaap:ShortdurationInsuranceContractsAccidentYear, us-gaap:StatementBusinessSegments

us-gaap:ShortdurationInsuranceContractsIncurredButNotReportedIbnrClaimsLiabilityNet

antm:ShortdurationInsuranceContractAccidentYear2020, antm:CommercialSpecialtyBusinessSegment



Period End2020-03-31
Value2182
Percentage of ShortdurationInsuranceContractsIncurredButNotReportedIbnrClaimsLiabilityNet100.0

antm:ShortdurationInsuranceContractAccidentYear2020, antm:GovernmentBusinessSegment



Period End2020-03-31
Value5453
Percentage of ShortdurationInsuranceContractsIncurredButNotReportedIbnrClaimsLiabilityNet249.9

antm:ShortdurationInsuranceContractAccidentYear2020, antm:OtherSegment



Period End2020-03-31
Value190
Percentage of ShortdurationInsuranceContractsIncurredButNotReportedIbnrClaimsLiabilityNet8.7

us-gaap:ShortDurationInsuranceContractAccidentYear2019, antm:CommercialSpecialtyBusinessSegment



Period End2020-03-312019-12-31
Value7632916
Percentage of ShortdurationInsuranceContractsIncurredButNotReportedIbnrClaimsLiabilityNet35.00.0

us-gaap:ShortDurationInsuranceContractAccidentYear2019, antm:GovernmentBusinessSegment



Period End2020-03-312019-12-31
Value8855484
Percentage of ShortdurationInsuranceContractsIncurredButNotReportedIbnrClaimsLiabilityNet40.60.0

us-gaap:ShortDurationInsuranceContractAccidentYear2019, antm:OtherSegment



Period End2020-03-31
Value0
Percentage of ShortdurationInsuranceContractsIncurredButNotReportedIbnrClaimsLiabilityNet0.0

us-gaap:ShortDurationInsuranceContractsAccidentYear2018, antm:CommercialSpecialtyBusinessSegment



Period End2020-03-312019-12-31
Value9478
Percentage of ShortdurationInsuranceContractsIncurredButNotReportedIbnrClaimsLiabilityNet4.30.0

us-gaap:ShortDurationInsuranceContractsAccidentYear2018, antm:GovernmentBusinessSegment



Period End2020-03-312019-12-31
Value6389
Percentage of ShortdurationInsuranceContractsIncurredButNotReportedIbnrClaimsLiabilityNet2.90.0

us-gaap:ShortDurationInsuranceContractsAccidentYear2018, antm:OtherSegment



Period End2020-03-31
Value0
Percentage of ShortdurationInsuranceContractsIncurredButNotReportedIbnrClaimsLiabilityNet0.0

us-gaap:ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndClaimAdjustmentExpenseOtherReconcilingItem



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value212195207209214188
Percentage of ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndClaimAdjustmentExpenseOtherReconcilingItem100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

antm:GovernmentBusinessSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value212195207209214188
Percentage of ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndClaimAdjustmentExpenseOtherReconcilingItem100.0100.0100.0100.0100.0100.0

antm:OtherSegment



Period End2020-03-31
Value0
Percentage of ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndClaimAdjustmentExpenseOtherReconcilingItem0.0

us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-12-312014-09-302014-06-30
Value3263379240984741519954935986638367837178254036664125417541754175417541754281569110341613
Percentage of StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UnearnedPremiums



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value9471017948900998902896208921158601950183719269711613832102111459459501079107810039531073822939823865968823170716249261638103810488911050
Percentage of UnearnedPremiums100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Line plots across dimensions of each concept

us-gaap:OperatingIncomeLoss us-gaap:ProductOrService


us-gaap:StockholdersEquity us-gaap:StatementEquityComponents


us-gaap:StockholdersEquity us-gaap:StatementEquityComponents