ANTM


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

Table of contents



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

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:BenefitsLossesAndExpenses

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:CostOfGoodsAndServicesSold

us-gaap:GainsLossesOnExtinguishmentOfDebt
us-gaap:DebtInstrument

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeTaxExpenseBenefit

us-gaap:InterestExpense

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents

us-gaap:NetInvestmentIncome

us-gaap:OperatingIncomeLoss
us-gaap:ProductOrService

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherIncome

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet

us-gaap:PremiumsEarnedNet

us-gaap:ProfitLoss

us-gaap:RealizedInvestmentGainsLosses

us-gaap:Revenues

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:Assets
us-gaap:ConsolidatedEntities

us-gaap:Liabilities
us-gaap:ConsolidatedEntities

us-gaap:LiabilitiesAndStockholdersEquity
us-gaap:ConsolidatedEntities

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

us-gaap:AssetsCurrent
us-gaap:ConsolidatedEntities

us-gaap:CashAndCashEquivalentsAtCarryingValue
us-gaap:ConsolidatedEntities

us-gaap:OtherAssetsCurrent
us-gaap:ConsolidatedEntities

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AmortizationOfIntangibleAssets

us-gaap:PropertyPlantAndEquipmentNet
us-gaap:ConsolidatedEntities

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

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill
us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:FiniteLivedIntangibleAssetsNet
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:BalanceSheetLocation
us-gaap:OperatingLeaseRightOfUseAsset
us-gaap:ConsolidatedEntities

us-gaap:OtherAssetsNoncurrent
us-gaap:ConsolidatedEntities

us-gaap:EquitySecuritiesFvNi
us-gaap:ConsolidatedEntities

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
us-gaap:ConsolidatedEntities

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:LiabilitiesCurrent
us-gaap:ConsolidatedEntities

us-gaap:LongTermDebtCurrent
us-gaap:ConsolidatedEntities
us-gaap:BalanceSheetLocation
us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherLiabilitiesCurrent
us-gaap:ConsolidatedEntities

us-gaap:LongTermDebt

us-gaap:LongTermDebtNoncurrent
us-gaap:ConsolidatedEntities

us-gaap:DeferredIncomeTaxLiabilitiesNet
us-gaap:RetirementPlanType
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:MinorityInterest
us-gaap:StatementEquityComponents

us-gaap:OtherLiabilitiesNoncurrent
us-gaap:ConsolidatedEntities
us-gaap:BalanceSheetLocation
us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo
us-gaap:ConsolidatedEntities

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree
us-gaap:ConsolidatedEntities

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour
us-gaap:ConsolidatedEntities

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive
us-gaap:ConsolidatedEntities

us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

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

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapital
us-gaap:ConsolidatedEntities

us-gaap:RetainedEarningsAccumulatedDeficit
us-gaap:ConsolidatedEntities

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
us-gaap:ConsolidatedEntities

us-gaap:MinorityInterest
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:ProfitLoss

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquireInvestments

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt
us-gaap:DebtInstrument

us-gaap:PaymentsOfDividends

us-gaap:PaymentsForRepurchaseOfCommonStock
us-gaap:DebtInstrument
us-gaap:DebtInstrumentInterestRateStatedPercentage
us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxAssetsNet

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance

antm:AOCICashFlowHedgeUnrealizedGainLossBeforeTax

antm:Changeinnoncreditcomponentofimpairmentlossesoninvestmentsnetoftax
us-gaap:InvestmentType
antm:EquitySecuritiesRealizedGainsLossesonSales
us-gaap:InvestmentType
antm:GrossRealizedGainsFromSaleofOtherInvestments

antm:Impairmentlossesreversalsoninvestments
us-gaap:InvestmentType

antm:Impairmentlossesreversalsrecognizedinearnings

antm:Netrealizedlossesgainsonfinancialinstruments
us-gaap:InvestmentType

antm:Noncreditcomponentofimpairmentlossesoninvestmentsrecognizedinothercomprehensiveincomebeforetax

antm:OperatingRevenue

antm:OtherNetChangeInUnrecognizedPeriodicBenefitCostsForDefinedBenefitPensionAndPostretirementBenefitPlansTaxBenefitExpense

antm:PotentiallyDilutiveRestrictedStockUnitsContingentOnOperatingResults

antm:Proceedsfromsaleofequityandfixedmaturitysecurities

antm:ProductRevenue
us-gaap:DebtInstrument
antm:RepurchasedFaceAmount

antm:SecuritiesLendingTransactionsInitialCollateralPercentageValue

antm:StockRepurchasedAndRetiredDuringPeriodAveragePrice

antm:Taxexpensebenefitofnoncreditimpairmentonavailableforsalesecuritiesrecognizedinothercomprehensiveincomeloss
us-gaap:InvestmentType
antm:UnrealizedGainsandLossesRecognizedonEquitySecurities

us-gaap:AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebtSubsequentAdjustments
us-gaap:StatementEquityComponents
us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesGrossRealizedGainLossNet

us-gaap:AvailableForSaleSecuritiesGrossRealizedGains
us-gaap:InvestmentType

us-gaap:AvailableForSaleSecuritiesGrossRealizedLosses
us-gaap:InvestmentType
us-gaap:DebtInstrument
us-gaap:DebtInstrumentConvertibleConversionRatio1

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold
us-gaap:FinancialInstrument
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:DefinedBenefitPlanContributionsByEmployer
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:DerivativeGainLossOnDerivativeNet

us-gaap:DividendsCommonStock
us-gaap:StatementEquityComponents

us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents
us-gaap:DebtInstrument
us-gaap:ExtinguishmentOfDebtAmount

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:InvestmentType
us-gaap:GainLossOnSaleOfOtherInvestments
us-gaap:BusinessAcquisition, us-gaap:StatementBusinessSegments
us-gaap:GoodwillPurchaseAccountingAdjustments

us-gaap:IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities

us-gaap:IncreaseDecreaseInCollateralHeldUnderSecuritiesLending

us-gaap:IncreaseDecreaseInDeferredRevenue

us-gaap:IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable

us-gaap:IncreaseDecreaseInInsuranceLiabilities

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInReceivables

us-gaap:IncreaseDecreaseInSecuritiesLendingPayable

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:LongTermPurchaseCommitmentAmount
us-gaap:LitigationCase, us-gaap:GainContingenciesByNature
us-gaap:LossContingencyDamagesSoughtValue

us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance
us-gaap:StatementEquityComponents

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeaseImpairmentLoss

us-gaap:OperatingLeasePayments

us-gaap:OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesBeforeReclassificationAdjustmentsTax

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax

us-gaap:OtherComprehensiveIncomeLossTax

us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToNoncontrollingInterest

us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax

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

us-gaap:PaymentsForLossesAndLossAdjustmentExpense
us-gaap:StatementBusinessSegments

us-gaap:PaymentsForProceedsFromOtherInvestingActivities
us-gaap:RestructuringCostAndReserve
us-gaap:PaymentsForRestructuring
us-gaap:RestructuringCostAndReserve, us-gaap:StatementBusinessSegments
us-gaap:DebtInstrument
us-gaap:PaymentsOfDebtExtinguishmentCosts

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired
us-gaap:LitigationCase
us-gaap:ProceedsFromDivestitureOfBusinesses

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromRepaymentsOfCommercialPaper

us-gaap:ProceedsFromSaleOfAvailableForSaleSecurities
us-gaap:InvestmentType

us-gaap:ProceedsFromShortTermDebt

us-gaap:ProceedsFromStockOptionsExercised

us-gaap:RepaymentsOfShortTermDebt

us-gaap:RestructuringAndRelatedCostIncurredCost
antm:RestructuringActivityOfIndividualSegmentsReporting
us-gaap:RestructuringCostAndReserve

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice

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

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised

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:AccumulatedOtherComprehensiveIncomeLossAdjustmentForNoncontrollingInterest

antm:AccumulatedOtherComprehensiveIncomeLossNonCreditComponentofImpairmentLossonInvestmentsNetOfTax

antm:Accumulatedothercomprehensiveincomelossnoncreditcomponentofimpairmentsoninvestments

antm:AssumedPremiumsReceivable

antm:AvailableForSaleSecuritiesAccumulatedOtherComprehensiveIncomeNetDeferredTaxLiability

antm:AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostNoncurrent

antm:CashFlowHedgingInstrumentsAccumulatedOtherComprehensiveIncomeNetDeferredTaxAsset
us-gaap:LongtermDebtType
antm:CommercialPaperMaximumBorrowingCapacity

antm:DeferredNetActuarialGainLossPostretirementBenefits

antm:DeferredPriorServiceCostCreditPostretirementBenefitPlans

antm:DeferredTaxAssetsLeasingArrangements

antm:DeferredTaxAssetsRelatedToDepreciationAndAmortization

antm:DeferredTaxLiabilitiesInvestmentBasis

antm:DeferredTaxLiabilitiesRelatingToCapitalizedSoftwareOther

antm:DeferredTaxLiabilityPostretirementBenefits

antm:DeferredTaxliabilitiesDeferredExpenseRetirementbenefits

antm:DefinedBenefitFairValueDueFromBrokers

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
us-gaap:BalanceSheetLocation
antm:Fairvaluehedgescumulativebasisadjustments
us-gaap:SubsequentEventType
antm:IncreaseInStockRepurchaseProgramAuthorization

antm:IntangibleAssetsAccumulatedAmortizationExcludingGoodwill
us-gaap:ConsolidatedEntities
antm:InvestmentInSubsidiaries

antm:LesseeOperatingLeaseLeaseNotYetCommencedExpense

antm:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpensePurchaseAdjustments
us-gaap:StatementBusinessSegments

antm:NonCreditComponentofImpairmentsonInvestmentsInAccumulatedOtherComprehensiveIncomeDeferredTaxLiabilityAsset

antm:NumberOfMedicalMembersServed

antm:PatientProtectionAffordableCareActHealthInsuranceProviderFee
us-gaap:SubsequentEventType

antm:SelfFundedReceivablesNet

antm:SelffundedReceivablesAllowanceForDoubtfulAccounts

antm:ShortDurationContractLiabilityForClaimsAdjustmentExpense
us-gaap:StatementBusinessSegments

antm:ShortdurationcontractliabilityforunpaidclaimsandadjustmentexpenseNet
us-gaap:StatementBusinessSegments

antm:UnrecognizedTaxBenefitsThatWouldNotImpactEffectiveTaxRateInFuturePeriodsIfRecognized

dei:EntityCommonStockSharesOutstanding

us-gaap:AccruedInvestmentIncomeReceivable

us-gaap:AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxDebtSecurities

us-gaap:AllowanceForDoubtfulOtherReceivablesCurrent

us-gaap:AociLossCashFlowHedgeCumulativeGainLossAfterTax
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:AssetsHeldByInsuranceRegulators

us-gaap:AssumedLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis
us-gaap:ConsolidatedEntities

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:InvestmentType
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent
us-gaap:ConsolidatedEntities

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:BusinessAcquisition, us-gaap:StatementBusinessSegments
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill

us-gaap:CapitalizedComputerSoftwareGross

us-gaap:CashAndCashEquivalentsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:CededPremiumsPayable

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

us-gaap:ContractualObligation

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

us-gaap:DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent
us-gaap:DebtInstrument

us-gaap:DebtInstrumentConvertibleConversionPrice1

us-gaap:DebtInstrumentFaceAmount
us-gaap:DebtInstrument
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrumentInterestRateEffectivePercentage
us-gaap:DebtInstrument
us-gaap:DebtInstrumentRepurchasedFaceAmount
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:DebtInstrumentUnamortizedDiscount
us-gaap:DebtInstrument

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

us-gaap:DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible
us-gaap:ConsolidatedEntities
us-gaap:DeferredIncomeTaxAssetsNet

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets

us-gaap:DeferredTaxLiabilitiesLeasingArrangements
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmountsRecognizedInBalanceSheet
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
antm:DefinedBenefitPlanByAge, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanByPlanAssetCategories
us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
antm:DefinedBenefitPlanByAge, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanUltimateHealthCareCostTrendRate1
us-gaap:AssetsSoldUnderAgreementsToRepurchaseMaturityPeriods
us-gaap:DepositsReceivedForSecuritiesLoanedAtCarryingValue
us-gaap:AssetsSoldUnderAgreementsToRepurchaseMaturityPeriods, us-gaap:FinancialInstrument
us-gaap:BalanceSheetLocation
us-gaap:DerivativeAmountOfHedgedItem

us-gaap:DerivativeAssetCollateralObligationToReturnCashOffset
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:InvestmentType
us-gaap:DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement
us-gaap:InvestmentType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:InvestmentType
us-gaap:DerivativeAssets
us-gaap:InvestmentType

us-gaap:DerivativeFairValueOfDerivativeAsset
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:InvestmentType
us-gaap:HedgingDesignation

us-gaap:DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral

us-gaap:DerivativeFairValueOfDerivativeLiability
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:InvestmentType
us-gaap:HedgingDesignation

us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:DerivativeFixedInterestRate
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:InvestmentType
us-gaap:DerivativeLiabilities
us-gaap:InvestmentType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:InvestmentType
us-gaap:DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement
us-gaap:InvestmentType

us-gaap:DerivativeNotionalAmount
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:InvestmentType
us-gaap:HedgingDesignation
us-gaap:SubsequentEventType
us-gaap:DividendsPayableAmountPerShare
us-gaap:ConsolidatedEntities
us-gaap:DueToAffiliateCurrent
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:DueToRelatedPartiesCurrent
antm:CapitalStock
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
us-gaap:DefinedBenefitPlanByPlanAssetCategories
us-gaap:FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments

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

us-gaap:FinancialLiabilitiesFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsGross
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:GoodwillImpairedAccumulatedImpairmentLoss
us-gaap:ConsolidatedEntities
us-gaap:GuaranteeObligationsCurrentCarryingValue

us-gaap:IncomeTaxesReceivable

us-gaap:IncreaseInUnrecognizedTaxBenefitsIsReasonablyPossible

us-gaap:IntangibleAssetsGrossExcludingGoodwill
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
us-gaap:ConsolidatedEntities

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

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:LitigationCase
us-gaap:LitigationReserve

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongTermDebtPercentageBearingFixedInterestRate
us-gaap:LitigationCase
us-gaap:LossContingencyEstimateOfPossibleLoss
us-gaap:Range

us-gaap:NotesPayable
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
us-gaap:ConsolidatedEntities
us-gaap:OperatingLeasesFutureMinimumPaymentsDue
us-gaap:IncomeTaxAuthority, us-gaap:TaxPeriod
us-gaap:OperatingLossCarryforwards

us-gaap:OtherLongTermInvestments
us-gaap:ConsolidatedEntities
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:InvestmentType

us-gaap:OtherPolicyholderFunds

us-gaap:OtherReceivables
us-gaap:ConsolidatedEntities
us-gaap:RetirementPlanType
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities

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
antm:CapitalStock
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
antm:CapitalStock
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:SharePrice

us-gaap:ShortTermBorrowings
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency
us-gaap:ShortTermDebtType

us-gaap:ShortdurationInsuranceContractsCumulativePaidClaimsAndAllocatedClaimAdjustmentExpenseNet
us-gaap:ShortdurationInsuranceContractsAccidentYear, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments
us-gaap:ShortdurationInsuranceContractsAccidentYear, us-gaap:StatementBusinessSegments
us-gaap:ShortdurationInsuranceContractsIncurredButNotReportedIbnrClaimsLiabilityNet

us-gaap:ShortdurationInsuranceContractsIncurredClaimsAndAllocatedClaimAdjustmentExpenseNet
us-gaap:ShortdurationInsuranceContractsAccidentYear, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndClaimAdjustmentExpenseOtherReconcilingItem
us-gaap:StatementBusinessSegments
us-gaap:ShortdurationInsuranceContractsAccidentYear, us-gaap:StatementBusinessSegments
us-gaap:ShortdurationInsuranceContractsNumberOfReportedClaims
dei:LegalEntity
us-gaap:StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance

us-gaap:StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired
dei:LegalEntity

us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

us-gaap:UnearnedPremiums

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

Plots across concepts


IncomeStatement
Other Comprehensive Income Loss Net Of Tax
Expenses
Interest Expense
Balance Sheet
Operating Lease Liability
Assets
Property Plant And Equipment Net
Current Assets
Other Assets Current
NonCurrent Assets
Other Assets Noncurrent
PropertyPlantAndEquipmentNet
Property Plant And Equipment Net
Liabilities
Operating Lease Liability
Current Liabilities
Accrued Income Taxes Current
Noncurrent Liabilities
Minority Interest
Stockholders Equity
Accumulated Other Comprehensive Income Loss Net Of Tax
CashFlow
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInOperatingActivities
Share Based Compensation
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInFinancingActivities
Net Cash Provided By Used In Financing Activities
Shares
Weighted Average Number Of Shares Outstanding Basic
DividendsAndRepurchase
Dividends Common Stock
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Remainder Of Fiscal Year
FiniteLivedIntangibleAssets
Finite Lived Intangible Assets Net

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:CommonStockValue ▁▁▅▅▅▅▅▅▅▅▅▅▃▃▃▃▃▃▃▃▃▃▃▃▃▃▄▄▄▄▄▅▅▅▅▅▆▆▆▇▇██2.02.03.03.03.03.03.03.03.03.03.03.02.62.62.62.62.62.62.62.62.62.62.62.62.62.62.72.72.72.92.93.03.03.03.03.13.23.33.43.53.63.73.8NANANA4.5NANANA
 us-gaap:SharesOutstanding us-gaap:StatementEquityComponents us-gaap:CommonStock▁▁▁▁▁▁▁▁▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▃▃▃▃▃▄▄▅▅▅▆▆▆▇██243.9244.9245.4249.4252.1252.0252.9253.8255.9257.4257.4258.9260.1255.5256.1257.4263.1265.1263.7263.4263.2262.8261.2261.0261.6264.9268.1270.5274.5281.9293.3296.2299.3300.7304.7314.0325.2331.8339.4349.2362.2368.7377.7394.8403.3NA449.8NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding ▁█247.4248.2NA254.2255.4256.4NA260.0261.0262.3NA265.4264.5262.8NA267.0270.8270.4NA268.1268.2267.5NA269.2274.3280.4NA284.1286.0292.6NA304.5303.2305.9NA321.9331.2339.0NA360.4371.5379.3NA402.2421.8446.6NANANANA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic ▁█244.5245.0NA251.0252.2252.4NA255.2256.7257.1NA259.5258.7255.8NA260.5264.6264.4NA263.2263.0261.8NA261.3263.1266.6NA273.0276.8284.9NA297.4299.5303.2NA318.9327.7335.0NA356.0366.1374.0NA397.6417.3441.1NANANANA
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount ▁█0.30.4NA1.61.60.9NA0.70.70.2NA0.00.80.3NANA1.00.4NA2.52.61.7NA1.01.20.4NA0.11.40.6NA0.15.311.5NA14.810.810.1NA10.98.112.0NA17.818.016.2NANANANA
us-gaap:EarningsPerShareBasic ▇▆▂▁█▆▄▄▄▆▂▄▄▅▅▃▃▄▂▃▃▃▁▃▃▃▂▂▃▃▁▂▃▃▂▂▂▃▁▂▂▃▂▂▂▂▆▂▂▂7.336.82.230.889.026.033.694.644.446.031.643.74.075.134.82.873.233.821.42.352.972.690.692.513.273.251.882.312.642.460.52.212.672.921.522.171.962.560.971.921.922.481.411.861.731.996.021.551.441.17
us-gaap:EarningsPerShareDiluted ▇▆▂▁█▆▄▄▄▆▂▄▄▅▄▃▃▄▂▃▃▃▁▃▃▃▂▂▃▃▁▂▃▃▂▂▂▃▁▂▂▃▂▂▂▂▆▂▂▂7.256.712.190.878.915.943.624.554.365.911.613.623.984.994.672.83.163.731.372.32.912.630.682.433.133.091.82.222.562.40.492.162.642.891.512.151.942.530.961.91.892.441.41.841.711.965.951.531.431.16
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
 TTM Greenblatt ROC _ _▅▅▂▁█▅▃▄▄▅▂▃▄▅▁▃▃▄▂▃▄▄▂▃▄▄▃▃▃▃▁▃▃▄▂▃▃▃▂▃▃▄▂2081.02161.0605.0201.03360.02194.01098.01528.01433.01940.0750.01249.01559.01867.9381.0982.01227.01585.4653.01078.11500.21570.4439.81221.91512.11579.3885.51191.31222.91118.7392.71009.41231.71367.6431.11003.8991.71212.6512.5972.6946.71350.3693.1NANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:BenefitsLossesAndExpenses ████▆▆▆▆▅▅▅▄▄▄▅▄▄▄▄▄▄▃▄▃▃▃▃▃▃▂▂▂▂▂▂▁▁▁▂▁▁▁▁▁▁▁31498.030209.031213.030769.026115.027532.026309.025185.024013.022721.022830.022009.021440.220757.222556.121307.121201.521010.921055.820267.420007.918976.519813.618772.018457.517482.418097.217469.817209.716729.317111.117087.016585.116400.115054.714327.414358.714105.414839.514352.814093.313467.213973.213435.513301.713737.6NANANANA
us-gaap:ComprehensiveIncomeNetOfTax ▅▄▃▂█▃▃▄▄▅▁▃▃▃▄▃▃▃▂▂▃▂▁▂▂▃▂▂▃▃▂▂▂▃▂▃▂▃▂▂▃▃▂▃▂▃1971.01320.0813.0364.03030.0811.0937.01267.01379.01914.0250.0931.0991.21104.91255.2755.8882.21116.0464.4618.8798.1613.2104.5438.2621.6931.2345.5489.0878.7845.2336.2678.6430.4928.6376.4865.9620.8976.6318.0471.7793.9953.4401.0970.8696.3975.5NANANANA
us-gaap:CostOfGoodsAndServicesSold █▇█▇▇▆▄▃▁▁▁▁▁2614.02313.02522.02222.02225.01984.01149.0745.098.00.00.00.00.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:GainsLossesOnExtinguishmentOfDebt -5.0NA-2.0-30.0-3.0-1.0-3.00.00.01.06.01.00.9-19.1-282.40.00.00.00.00.00.00.07.52.32.9-3.4-0.3-74.8-3.0-3.00.0-145.30.00.00.00.0NANANANANANANANANANANANANANA
 us-gaap:GainsLossesOnExtinguishmentOfDebt us-gaap:DebtInstrument antm:OtherseniorunsecurednotesNANANA-30.0NANANANANANANANANANANANANANANANANANA0.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:GainsLossesOnExtinguishmentOfDebt us-gaap:DebtInstrument us-gaap:ConvertibleDebt-5.0NA-2.00.0-3.0-1.0-3.00.00.01.06.0NANANANANANANANANANANA7.52.32.9NANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▆▆▂▂█▆▃▄▄▅▂▄▄▅▁▃▄▄▂▃▄▄▂▃▄▄▃▃▄▃▂▃▄▄▂▃▃▄2353.02176.0611.0389.03149.02089.01098.01489.01453.01945.0542.01242.01503.51780.3124.21118.91205.71515.0658.61136.51448.31312.0374.31129.61558.01569.1887.11087.21263.71130.1469.9879.71208.11282.5480.21019.61048.71309.8NANANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments ▅▄▂▁▆▄▃▃▃▄▂▃▃▄▁▃▃▃▂▃▃▃▁▃▃▃▂▃▃▃▂▂▃▃▂▂▃▃▂▃▂▃▂▃▃▃█▃▃▂2353.02176.0611.0389.03149.02089.01098.01489.01453.01945.0543.01242.01503.51780.3124.21118.91205.71515.0658.61136.51448.31312.0374.31129.61558.01569.1887.11087.21263.71130.1459.8882.81210.51287.1481.41025.71048.61309.8478.21045.21007.41427.1752.11136.81129.61335.34339.71117.21052.5893.6
us-gaap:IncomeTaxExpenseBenefit ▇▇▅▆█▇▅▆▆▆▅▆▇▇▁▆▆▇▆▇▇▇▆▇▇▇▆▇▇▆▆▆▆▆▅▆▆▇▅▆▆▇▆▆▆▇552.0509.060.0167.0873.0566.0164.0306.0314.0394.0118.0282.0450.1467.8-1106.5372.0350.4505.1290.2518.7667.7609.0193.4474.8698.9703.9380.4456.3532.6438.7167.0226.6410.4401.917.2334.5405.0453.3142.9362.0305.8500.5203.3397.7407.2458.5NANANANA
us-gaap:InterestExpense ▆▆▆▆▆▆▆▅▅▆▆▆▆▅▄▄▆█▅▅▅▆▅▄▄▄▄▄▃▃▃▄▄▄▄▃▂▂▂▁▁▁▂▁▁▁205.0192.0191.0198.0201.0194.0190.0185.0184.0187.0189.0188.0191.7184.2163.6150.5189.9235.0177.3172.9185.7187.1179.7164.8154.1154.4153.6155.3145.6146.2145.8151.5151.9153.5151.5133.6117.6109.1112.6108.2103.6105.9113.0106.3100.299.4NANANANA
us-gaap:NetIncomeLoss ▅▅▂▁▇▅▃▄▄▅▂▃▃▄▄▃▃▃▂▂▃▂▁▂▃▃▂▂▃▂▁▂▃▃▂▂▂▃▂▂▂▃▂▃▃▃█▃▂▂1793.01665.0551.0222.02276.01523.0934.01183.01139.01551.0424.0960.01053.41312.51230.7746.9855.31009.9368.4617.8780.6703.0180.9654.8859.1865.2506.7630.9731.1701.0148.2656.2800.1885.2464.2691.2643.6856.5335.3683.2701.6926.6548.8739.1722.4876.82741.8730.2693.5580.4
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest █▁8.0-2.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetInvestmentIncome █▆▆▆▁▅▅▅▆▄▅▅▅▅▅▄▄▄▄▄▄▃▃▃▄▃▃▃▄▄▃▃▃▃▃▃▃▃▃▃▄▄▄▄▄▄400.0291.0286.0280.057.0254.0268.0242.0285.0210.0262.0250.0229.3229.2238.9220.2200.2207.2212.6200.9194.9171.1162.1161.2186.7167.6177.8174.4188.5183.7176.3167.6153.2162.0179.1168.6169.4169.0160.2170.9187.8184.8194.5205.4202.3201.1NANANANA
us-gaap:OperatingIncomeLoss ▅▅▂▁█▅▃▄▄▅▂▃▄▅▁▃▃▄▂▃▄▄▂▃▄▄▃▃▃▃▁▃▃▄▂▃▃▃▂▃▃▄▂▃▃▃2081.02161.0605.0201.03360.02194.01098.01528.01433.01940.0750.01249.01559.01867.9381.0982.01227.01585.4653.01078.11500.21570.4439.81221.91512.11579.3885.51191.31222.91118.7392.71009.41231.71367.6431.11003.8991.71212.6512.5972.6946.71350.3693.11039.71058.01286.7NANANANA
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax -6.0NA6.01.01.0-1.01.0-1.00.00.0-1.00.0-0.80.40.20.50.71.41.10.4-0.71.3-1.00.40.7-3.5-1.4-2.4-0.3-0.20.71.20.3-0.80.80.5-1.40.7NANANANANANANANANANANANA
us-gaap:OtherComprehensiveIncomeLossNetOfTax ▅▃▆▅█▁▄▅▆▆▄▄▄▃▅▄▅▅▅▄▄▄▄▃▃▅▄▄▅▅▅▅▃▅▄▅▄▅180.0-347.0262.0142.0754.0-712.03.084.0240.0363.0-175.0-29.0-62.2-207.624.58.926.9106.196.01.017.5-89.8-76.4-216.6-237.566.0-161.2-141.9147.6144.2188.022.4-369.743.4-87.8174.7-22.8120.1NANANANANANANANANANANANA
us-gaap:OtherIncome ▅▅▅▅▅▅█▇▅▅▅▅▅▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂1704.01685.01526.01659.01543.01587.03096.02651.01676.01545.01485.01529.01467.030.711.610.56.05.05.89.110.79.58.08.812.513.812.010.39.59.5-320.2124.3115.7120.6106.0141.034.815.913.410.48.58.77.74.618.35.9NANANANA
us-gaap:PolicyholderBenefitsAndClaimsIncurredNet █▇█▇▅▆▆▆▆▅▅▅▄▄▅▅▅▄▄▄▄▃▄▃▃▃▃▃▃▂▃▃▂▂▂▂▂▁▂▂▁▁▁▁▁▁24763.023699.024088.022921.019547.021489.021383.020753.020368.019282.018936.018185.017727.817045.918672.618103.617917.217542.817567.916922.516805.215538.816315.515469.115205.414126.914857.914211.114121.313664.614580.814075.013832.613748.712363.811984.812093.111771.912434.612062.911922.011228.011353.111205.610985.911382.3NANANANA
us-gaap:PremiumsEarnedNet ██▇▇▆▇▆▆▆▅▅▅▅▅▅▄▄▅▄▄▄▄▄▃▃▃▃▃▃▂▃▃▂▂▁▁▁▁▁▁▁▁▁▁▁▁28533.027676.027108.026392.025092.025517.024036.023793.023501.022843.021819.021451.021248.420902.821086.320797.020813.120951.320137.119786.119948.018988.918745.318513.018516.317610.517577.917226.017068.916517.016609.616580.916493.016435.614160.114037.114161.014138.514190.314181.613913.613684.113439.913366.713257.113909.9NANANANA
us-gaap:ProfitLoss █▁1801.01667.0NANA2276.01523.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:RealizedInvestmentGainsLosses █▁147.0-26.0NANA30.0-78.0NANANANANANANANANANANANANANANA-125.130.6-11.992.346.543.825.765.841.7105.595.454.216.8102.954.670.5106.941.694.941.557.147.661.636.548.4NANANANA
us-gaap:Revenues █▇▇▇▆▆▆▅▅▅▄▄▄▄▄▄▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▃▁▁▁33851.032385.031824.031158.029264.029621.027407.026674.025466.024666.023373.023251.022943.722537.522680.322426.022407.222525.921714.421403.921456.220288.520187.919901.620015.519051.518984.318557.018473.417859.417901.717969.817795.617687.215536.115353.115407.315415.215317.715398.015100.714894.314647.914598.214457.215098.519046.515425.115413.215143.3
us-gaap:SellingGeneralAndAdministrativeExpense ▅▅▆█▅▅▄▄▄▃▄▄▄▄▄▃▃▄▄▃▃▄▄▃▃▃▃▃▃▃▂▂▂▂▂▁▁▁▁▁▁▁▂▁▁▁3821.03925.04318.05305.04046.03781.03502.03418.03278.03166.03618.03546.03428.03428.53393.43011.13053.83191.33264.03124.62969.13200.23268.43080.43040.83145.23032.82968.32885.82861.52537.42580.02470.52365.02412.22078.62081.82165.72228.42119.62011.12076.52447.42063.22154.72174.1NANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:Assets ██▇▇▇▆▅▅▅▅▄▅▅▅▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▃▂▃▂▂▂▂▂▁▁▁▁▁▁96097.095683.086615.086574.087976.082399.077453.077809.075851.074523.071571.074445.074367.473300.470540.068309.968237.668943.565083.164399.964062.663858.761717.862335.664263.865546.062065.062058.262303.661685.559574.560263.559612.359408.658955.455817.954535.052496.552018.852549.950877.250918.050166.9NANANA52125.4NANANA
us-gaap:Liabilities ██▆▆▆▆▅▅▅▅▄▅▅▅▄▄▄▄▄▄▄▄▃▄▄▄▃▃▃▃▃▃▃▃▃▂▂▂▁▁▁▁▁61051.061765.053416.052653.053521.050706.045725.046477.045058.044525.043030.045351.045642.446288.044037.142361.641805.942851.639982.739655.739829.040311.638673.739099.541201.241211.737813.737764.237926.737340.234809.335455.435079.835090.635152.732001.430891.228968.128730.628831.826695.926939.926354.3NANANA27262.1NANANA
us-gaap:LiabilitiesAndStockholdersEquity ██▇▇▇▆▅▅▅▅▄▅▅▅▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▃▂▃▂▂▂▂▂▁▁▁▁▁▁96097.095683.086615.086574.087976.082399.077453.077809.075851.074523.071571.074445.074367.473300.470540.068309.968237.668943.565083.164399.964062.663858.761717.862335.664263.865546.062065.062058.262303.661685.559574.560263.559612.359408.658955.455817.954535.052496.552018.852549.950877.250918.050166.9NANANA52125.4NANANA
us-gaap:StockholdersEquity █▇▇▇█▆▆▆▆▅▄▅▄▃▃▃▃▃▂▂▂▁▁▁▁▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▂▂▁▂▁▂▂34968.033853.033199.033921.034455.031693.031728.031332.030793.029998.028541.029094.028725.027012.426502.925948.326431.726091.925100.424744.224233.623547.123044.123236.123062.624334.324251.324294.024376.924345.324765.224808.124532.524318.023802.723816.523643.823528.423288.223718.124181.323978.123812.624361.723790.524519.224863.3NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:AssetsCurrent ▇█▆▆▆▅▄▄▄▄▃▄▄▄▃▄▄▄▃▃▃▃▂▂▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁▁▁50238.054495.045751.045450.046764.041256.039033.039504.037805.036611.034321.037108.037370.436974.136262.836973.737130.737981.834314.932924.332957.732965.030862.131539.433202.234740.432228.932227.132428.231806.829745.829596.928900.828660.728268.429640.328470.127543.627097.427552.326756.826819.426140.8NANANA28070.7NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▄█▅▃▅▅▄▃▃▄▃▄▄▄▃▅▄▆▃▂▁▁▂▁▁▁▂▁▁▂▁▂▁▁▂▂▂▂▂▂▁▂▁▂▂▃▄5258.09326.05741.03984.06028.05345.04937.04190.04078.04482.03934.04260.04682.04630.63608.96097.24561.26772.44075.32546.01582.71676.02113.51547.81553.01397.02151.71717.91784.61971.21582.12185.71347.31665.32484.62442.11953.12279.12201.62508.41699.82402.01788.82246.22027.93526.24816.1NANANA
us-gaap:OtherAssetsCurrent ██▇▇▇▇▃▂▂▃▂▄▅▆▃▂▂▂▂▂▂▃▁▂▃▃▁▂▂▃▁▂▂▂▂▂▂▂▂▁▁▁▁4701.04693.04060.04147.04260.04135.02319.02113.02151.02172.02104.02875.03106.13552.32249.31822.01774.61823.61781.81906.82083.32494.11555.71878.02178.82534.11474.61922.12165.82417.61677.51807.81823.01891.01829.01875.51913.61920.61859.01600.51601.51639.31534.1NANANA1268.6NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:PropertyPlantAndEquipmentGross NANA7327.0NANANA6479.0NANANA5548.0NANANA4372.5NANANA4139.9NANANA4058.4NANANA3764.8NANANA3485.0NANANA3220.5NANANA2655.2NANANA2423.0NANANA2360.1NANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType antm:DataProcessingEquipmentAndSoftwareNANA1218.0NANANA1264.0NANANA1266.0NANANA1080.1NANANA1024.5NANANA1046.1NANANA940.3NANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:BuildingAndBuildingImprovementsNANA174.0NANANA169.0NANANA169.0NANANA167.7NANANA215.1NANANA216.6NANANA279.9NANANA384.0NANANA406.0NANANA392.1NANANA388.2NANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:LandAndLandImprovementsNANA17.0NANANA17.0NANANA18.0NANANA17.8NANANA21.2NANANA21.5NANANA25.8NANANA35.4NANANA45.9NANANA52.3NANANA51.9NANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:LeaseholdImprovementsNANA671.0NANANA715.0NANANA563.0NANANA494.0NANANA462.4NANANA429.3NANANA356.4NANANA325.1NANANA303.9NANANA190.2NANANA165.5NANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:SoftwareAndSoftwareDevelopmentCostsNANA5247.0NANANA4314.0NANANA3532.0NANANA2612.9NANANA2416.7NANANA2344.9NANANA2162.4NANANA1879.0NANANA1672.1NANANA1295.0NANANA1145.6NANANANANANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment NANA3844.0NANANA3346.0NANANA2813.0NANANA2197.6NANANA2162.0NANANA2038.6NANANA1820.5NANANA1683.5NANANA-1482.2NANANA1237.1NANANA1267.5NANANA1260.5NANANA
us-gaap:AmortizationOfIntangibleAssets █▆███▇▆▇▇▇███▆▁▁▁▁▂▂▂▂▃▄▄▃▃▄▃▃▁▄▅▅▄▄▃▃▄▄▃▃▄▄▄▄90.080.092.093.093.083.082.084.085.087.093.091.093.679.544.141.940.641.846.647.447.950.457.560.060.152.552.660.354.054.043.166.667.767.963.063.959.558.763.962.156.656.859.760.460.960.7NANANANA
us-gaap:PropertyPlantAndEquipmentNet █▇▇▇▇▇▆▆▆▅▅▅▄▄▄▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▂▂▂▂▁▁▁▁3733.03533.03483.03363.03427.03350.03133.02921.02837.02799.02735.02592.02392.22237.62174.92049.21975.71957.61977.92006.61989.81998.32019.81930.81931.41915.91944.31848.91829.21811.71801.51806.51769.51738.11738.31536.51478.41454.61418.11316.91212.91186.11155.5NANANA1099.6NANANA
us-gaap:Goodwill █▆▆▆▆▆▆▆▆▆▆▆▅▅▅▄▄▄▄▄▄▄▄▄▄▄▃▃▃▃▃▄▄▄▄▂▂▁▁▁▁▁▁24399.021708.021691.021687.021641.021661.020500.020500.020500.020500.020504.020468.020414.520185.519231.217587.817561.217561.217561.217562.217562.217562.217562.217550.617541.717570.917082.017082.017082.916916.716917.217497.617488.617489.517510.514469.114534.313858.613858.713846.913263.713264.513264.9NANANA13264.6NANANA
us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill NANA7515.0NANANA7290.0NANANA7290.0NANANA7290.3NANANA7290.3NANANA7290.3NANANA6995.3NANANA7267.1NANANA7536.5NANANA6387.1NANANA6387.1NANANA6386.8NANANA
 us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass us-gaap:LicensingAgreementsNANA1216.0NANANA991.0NANANA991.0NANANA991.6NANANA991.6NANANA991.6NANANA696.6NANANA696.6NANANA676.6NANANA116.6NANANA116.6NANANA116.6NANANA
 us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass us-gaap:TrademarksNANA6299.0NANANA6299.0NANANA6299.0NANANA6298.7NANANA6298.7NANANA6298.7NANANA6298.7NANANA6298.7NANANA6588.1NANANA5998.7NANANANANANANANANANANA
us-gaap:IntangibleAssetsNetExcludingGoodwill █▅▅▅▆▆▃▃▄▄▄▄▅▄▂▁▁▁▁▁▂▂▂▂▂▂▁▁▂▂▃▄▄▄▄▂▂▁▁▁▁▁▁10540.09352.09405.09497.09577.09613.08674.08756.08840.08925.09007.09101.09224.39076.08368.47840.67882.47923.07964.98012.38059.78107.68158.08215.58275.58293.67958.18010.68071.08387.38441.08921.68988.19055.89102.88210.58126.27878.17931.77994.27883.47940.17996.8NANANA8259.3NANANA
us-gaap:FiniteLivedIntangibleAssetsNet NANA1890.0NANANA1384.0NANANA1717.0NANANA1078.1NANANA674.6NANANA867.7NANANA962.8NANANA1173.9NANANA1566.3NANANA1544.6NANANA1609.7NANANA1872.5NANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:ContractualRightsNANA209.0NANANA130.0NANANA143.0NANANA114.2NANANA84.6NANANA92.3NANANA89.5NANANA95.8NANANA102.4NANANA72.6NANANANANANANANANANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:CustomerRelationshipsNANA1414.0NANANA1031.0NANANA1310.0NANANA847.1NANANA551.2NANANA724.4NANANA845.0NANANA1044.7NANANA1424.7NANANA1426.2NANANANANANANANANANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:OtherIntangibleAssetsNANA267.0NANANA223.0NANANA264.0NANANA116.8NANANA38.8NANANA51.0NANANA28.3NANANA33.4NANANA39.2NANANA45.8NANANANANANANANANANANA
 us-gaap:OperatingLeaseRightOfUseAsset us-gaap:BalanceSheetLocation us-gaap:OtherNoncurrentAssets▃▂▂▃██▁▁▂▂683.0628.0646.0679.0917.0915.0575.0577.0637.0606.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingLeaseRightOfUseAsset us-gaap:ConsolidatedEntities srt:ParentCompanyNANA95.0NANANA99.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent ▇▆▆██▇▅▇▆▆▂▄▃▃▂▃▃▂▁▄▃▂▁▂▃▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▂▂▁1689.01563.01438.01849.01950.01833.01350.01667.01608.01453.0758.01074.0950.4832.0565.3850.9778.4640.5467.91168.5862.2609.8485.4661.3864.3746.0619.9664.8675.9635.8645.2456.0464.7483.3486.1451.9458.6445.7433.6539.1557.3542.2488.3NANANA393.0NANANA
us-gaap:EquitySecuritiesFvNi ▄█▃▇█▁▂1746.03630.01559.03075.03470.0570.01009.0NANANA1493.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent ▇▆▆▇▆▆▄▅▄▄▅█▇▇▆▅▃▃▄▃▄▄▂▂▄▅▃▃▄▄▃▂▂▂▂▁▁▁▂▁▁▁▂5598.05329.05493.05550.05257.05058.04198.04445.04028.03951.04959.06286.05931.45816.75024.44454.23815.73622.14014.93717.24272.24164.53318.83293.34433.84454.73651.83447.64263.84113.13426.33301.23286.62936.83132.52648.52788.52809.93124.12814.82599.72667.42942.2NANANA2994.1NANANA
us-gaap:AccruedIncomeTaxesCurrent NA176.0NANANANANANANA105.00.0NANA194.90.0187.5113.0491.00.060.4NA163.50.03.6NA283.80.0NANA97.70.0NANA204.80.0NANA265.80.0NANANANANANANANANANANA
us-gaap:LiabilitiesCurrent ██▆▆▆▅▄▄▄▄▄▄▅▅▄▅▄▄▃▃▃▃▃▂▃▃▃▂▃▃▂▂▂▂▂▁▂▂▂▂▁▁▁33794.034749.029453.028561.028522.027039.023617.023234.023090.022682.021965.024174.024505.724755.923356.024412.522567.923174.221294.421036.920816.820810.319092.618365.820673.221305.418753.418395.019176.318493.716351.516042.416034.116030.115836.914083.116177.815955.115825.715786.314107.314160.314009.5NANANA14673.7NANANA
us-gaap:LongTermDebtCurrent ▅▄▄████▄▅▅▅▅▄▄▇▇▄▆▅▅▅▃▁▁▄▄▄▄▃▃▃▁▃▃▃▁▅▅▇▇▃▃▄849.0700.0700.01599.01603.01603.01598.0700.0850.0851.0849.0849.0650.2650.81274.61273.4624.41152.8928.4927.9927.9399.20.00.0624.9625.0625.0625.0509.4518.7518.00.1399.6399.4557.10.2813.7910.81274.51274.1456.3359.2705.9NANANA60.8NANANA
 us-gaap:OperatingLeaseLiabilityCurrent us-gaap:BalanceSheetLocation us-gaap:OtherCurrentLiabilities▄▁▁███▅144.0116.0110.0192.0193.0195.0158.0NANA158.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesCurrent ▆█▅▅▆▄▃▃▃▃▂▂▂▃▂▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁7730.010159.06052.06245.07252.05202.03692.03867.03935.04037.03190.03306.03302.83475.53343.03788.43668.93643.13581.33129.92762.12883.92816.12282.82246.32171.71861.21903.61901.91805.91674.71828.81844.91848.01713.51766.61958.31660.11654.11582.41640.01550.01617.3NANANA1775.2NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:LongTermDebt NANA20035.0NANA300.019385.0NANANA18066.0NANANA18656.8NANANA15286.9NANANA15324.515719.616093.3NA14752.215163.3NANA14091.614514.1NANA14727.9NANANA9695.4NANANA8853.7NANANA8399.1NANANA
us-gaap:LongTermDebtNoncurrent ██▆▆▇▆▆▆▆▅▅▅▆▆▅▄▄▅▄▄▄▄▄▅▅▄▄▄▄▄▄▄▄▄▄▄▂▁▁▁▁▁▁22217.022534.019335.019094.019873.019005.017787.018820.017436.017396.017217.017300.017515.418110.117382.213777.315088.015449.914358.514242.314202.414864.515324.515719.615468.414764.414127.214538.314037.813932.113573.614514.014091.514030.014170.813395.710135.68462.58420.98622.38292.18542.08147.8NANANA8338.3NANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet ▇▁▂▆█▄▄2397.01961.02019.02375.02497.02213.02227.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanType us-gaap:OtherPostretirementBenefitPlansDefinedBenefitNANA8.0NANANA56.0NANANA95.0NANANA167.9NANANA233.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanType us-gaap:PensionPlansDefinedBenefitNANA65.0NANANA60.0NANANA53.0NANANA56.7NANANA60.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:MinorityInterest █▁78.065.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesNoncurrent █▇███▇▅▆▇▆▃▃▃▂▂▂▁▁▁▂▅▄▂▄▄▃▂▁▁▁▁▁▂▂▂▂▂▂▂▂▂▂▂1869.01745.01815.01839.01853.01695.01420.01622.01666.01612.01182.01145.01074.4942.3925.1944.0898.3889.9883.81040.71479.81319.9994.31228.71225.81099.41035.8891.0852.7832.4836.0874.2945.8971.81013.2957.91013.31025.01029.3965.11019.2958.2963.4NANANA1115.1NANANA
 us-gaap:OperatingLeaseLiabilityNoncurrent us-gaap:BalanceSheetLocation us-gaap:OtherNoncurrentLiabilities█▇█▇▇▇▁833.0801.0847.0798.0815.0801.0482.0NANA482.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo █▄▁▇198.0188.0180.0195.0NANA149.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree ▇▃▁█175.0163.0156.0179.0NANA136.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour ▆▃▁█146.0134.0125.0157.0NANA116.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive ▄▂▁█105.094.088.0125.0NANA87.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive █▂▁█324.0243.0236.0322.0NANA135.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:StockholdersEquity █▇▇▇█▆▆▆▆▅▄▅▄▃▃▃▃▃▂▂▂▁▁▁▁▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▂▂▁▂▁▂▂34968.033853.033199.033921.034455.031693.031728.031332.030793.029998.028541.029094.028725.027012.426502.925948.326431.726091.925100.424744.224233.623547.123044.123236.123062.624334.324251.324294.024376.924345.324765.224808.124532.524318.023802.723816.523643.823528.423288.223718.124181.323978.123812.624361.723790.524519.224863.3NANANA
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest █▄▁35046.033918.033199.0NA34455.031693.031728.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:CommonStockValue ▁▁▅▅▅▅▅▅▅▅▅▅▃▃▃▃▃▃▃▃▃▃▃▃▃▃▄▄▄▄▄▅▅▅▅▅▆▆▆▇▇██2.02.03.03.03.03.03.03.03.03.03.03.02.62.62.62.62.62.62.62.62.62.62.62.62.62.62.72.72.72.92.93.03.03.03.03.13.23.33.43.53.63.73.8NANANA4.5NANANA
us-gaap:AdditionalPaidInCapital ▂▂▂▂▂▂▃▃▃▃▃▃▃▁▁▁▂▂▂▁▁▁▁▁▁▃▄▄▄▃▅▅▅▅▅▅▅▆▆▇▇▇█9109.09253.09244.09352.09360.09338.09448.09524.09494.09482.09536.09720.09747.98489.38547.48765.18897.08893.48805.18741.48677.58616.58555.68687.98707.49943.710062.310094.410154.810003.510765.210769.410738.810697.410853.510869.711204.411369.011679.212009.612415.912523.112862.6NANANA15192.2NANANA
us-gaap:RetainedEarningsAccumulatedDeficit ██▇▇█▇▆▆▆▆▅▅▅▅▄▄▄▄▄▄▃▃▃▃▃▃▃▂▂▃▂▃▂▂▂▂▂▂▁▁▁▁▁25874.024793.023802.024678.025346.023360.022573.022104.021679.021136.019988.020182.019757.319241.118054.417306.617667.017357.716560.616364.115918.415310.414778.514761.814352.214150.114014.413863.813744.414011.513813.914040.513817.913275.112647.112556.812224.011921.111490.711572.811418.111199.910721.6NANANA9598.5NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▆▅▆▅▅▁▄▄▄▃▁▂▂▂▅▅▅▅▄▄▄▄▄▅▆▇▇▇█▇▇▆▆▇▇█▇▇▆▆▇▇▇-17.0-195.0150.0-112.0-254.0-1008.0-296.0-299.0-383.0-623.0-986.0-811.0-782.8-720.6-101.5-126.0-134.9-161.8-267.9-363.9-364.9-382.4-292.6-216.20.4237.9171.9333.1475.0327.4183.2-4.8-27.2342.5299.1386.9212.2235.0114.9132.2343.7251.4224.6NANANA68.1NANANA
 us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:ConsolidatedEntities srt:ParentCompanyNANA150.0NANANA-296.0NANANA-986.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:MinorityInterest █▁78.065.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▄▅▆▁█▅▄▄▄▄▃▃▃▅▁▅▃▅▃▃▃▄▃▃▄▄▃▃▃▄▃▄▃▃▃▃▃▄▂▄▃▃▃▃▃▂1683.02505.03813.0-1150.05510.02515.01327.01667.01437.01630.0463.0606.9542.22214.9-1301.22404.7393.12688.2274.7963.5662.01304.3949.1343.41173.01650.5305.1605.71071.01387.5272.81397.4425.2956.9759.8240.2521.51223.157.91429.8771.81114.9587.0896.5256.1-322.9NANANANA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▁▄▇▇▁▄█▅▆▆█▆▆▆▃█▆▆██▇▅█▇█▄█▇▆▆▇▇▆▆▅▅▅▇▇▆▆▇▇▆▆▇-4925.0-2307.0305.089.0-4934.0-2784.0723.0-1698.0-1165.0-652.0773.0-687.8-778.3-565.9-3620.7807.1-1041.8-1227.0670.9523.0-316.8-1391.0630.7244.5684.9-2711.6660.1-107.7-783.0-744.3-147.6-23.4-867.8-1195.6-1266.5-1317.9-1987.320.1381.2-853.0-752.3282.1-102.6-849.0-511.8191.9NANANANA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▃█▁▃▄▅▂▄▃▃▂▃▄▃▇▂▂▅▅▃▃▃▃▃▂▄▃▃▃▄▃▃▄▃▅▆▅▂▃▄▃▃▃▄▂▂-820.03388.0-2367.0-984.0105.0679.0-1304.0144.0-677.0-429.0-1561.0-340.6288.3-627.72433.2-1676.8-1563.81234.3581.5-524.1-437.1-353.2-1012.4-593.9-1703.0311.9-528.9-560.9-474.1-258.6-725.8-536.8123.9-579.1547.81566.31141.8-1167.0-744.0234.1-723.5-785.8-939.8167.5-1239.3-1157.7NANANANA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▁█▆▃▅▅▅▅▄▅-4068.03585.01757.0-2044.0683.0408.0747.0112.0-404.0548.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:DeferredIncomeTaxExpenseBenefit ▇▇▄▆▇▇█▆▇▇▇█▇▇▁▇▇▆▇▇▇▇▇▇▇▇▇▇▇█▇▇▇▇▆█▇▇▇▇▇▇▇▇▇▇-39.031.0-438.0-162.03.057.0110.0-108.024.055.0-50.0139.153.4-51.5-1034.6-27.6-52.7-157.245.3-18.126.473.3-53.1-60.3-23.170.6-77.459.4-36.585.271.1-26.45.39.1-127.8167.727.759.9-77.040.066.644.7-9.243.327.540.2NANANANA
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet █▆█▄▁▄▄▄▅▄▅▅▅▅▆▄▄▅▅▅▄▄▄▄▄▄▄▄▅▄▃▅▄▄▅▄▄▄▄▄▄▄▄▄▄▄194.0109.0171.0-15.0-137.0-13.016.016.045.015.045.054.750.954.4112.58.7-2.846.242.631.621.60.7-13.212.59.0-3.212.318.229.224.5-23.134.217.010.537.1-14.27.910.0-10.84.010.011.04.65.821.112.0NANANANA
us-gaap:NetCashProvidedByUsedInOperatingActivities ▄▅▆▁█▅▄▄▄▄▃▃▃▅▁▅▃▅▃▃▃▄▃▃▄▄▃▃▃▄▃▄▃▃▃▃▃▄▂▄▃▃▃▃▃▂1683.02505.03813.0-1150.05510.02515.01327.01667.01437.01630.0463.0606.9542.22214.9-1301.22404.7393.12688.2274.7963.5662.01304.3949.1343.41173.01650.5305.1605.71071.01387.5272.81397.4425.2956.9759.8240.2521.51223.157.91429.8771.81114.9587.0896.5256.1-322.9NANANANA
us-gaap:NetIncomeLoss ▅▅▂▁▇▅▃▄▄▅▂▃▃▄▄▃▃▃▂▂▃▂▁▂▃▃▂▂▃▂▁▂▃▃▂▂▂▃▂▂▂▃▂▃▃▃█▃▂▂1793.01665.0551.0222.02276.01523.0934.01183.01139.01551.0424.0960.01053.41312.51230.7746.9855.31009.9368.4617.8780.6703.0180.9654.8859.1865.2506.7630.9731.1701.0148.2656.2800.1885.2464.2691.2643.6856.5335.3683.2701.6926.6548.8739.1722.4876.82741.8730.2693.5580.4
us-gaap:ProfitLoss █▁1801.01667.0NANA2276.01523.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ShareBasedCompensation ▆▆▆▇▆▆▆█▆▆█▅▃▄▃▄▄▄▃▄▄▃▃▄▃▂▄▃▄▃▄▃▄▂▂▄▃▃▃▃▃▂▃▃▄▁69.064.069.080.067.067.068.086.070.070.091.056.935.942.238.943.644.442.740.341.944.837.637.242.441.527.143.236.850.138.842.340.641.621.522.852.239.032.536.737.238.322.639.439.543.014.1NANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▁▄▇▇▁▄█▅▆▆█▆▆▆▃█▆▆██▇▅█▇█▄█▇▆▆▇▇▆▆▅▅▅▇▇▆▆▇▇▆▆▇-4925.0-2307.0305.089.0-4934.0-2784.0723.0-1698.0-1165.0-652.0773.0-687.8-778.3-565.9-3620.7807.1-1041.8-1227.0670.9523.0-316.8-1391.0630.7244.5684.9-2711.6660.1-107.7-783.0-744.3-147.6-23.4-867.8-1195.6-1266.5-1317.9-1987.320.1381.2-853.0-752.3282.1-102.6-849.0-511.8191.9NANANANA
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▆▄▆▇▅▄█▆▄▅▇█▇▄▆▄▃▂▃▃▂▂▅▃▂▁▇▂▂▂▅▃▂▁▃▃▁▂▄▂▁▁▂▂▁▂285.0204.0278.0306.0233.0204.0351.0271.0221.0234.0320.0355.5314.3218.2283.3218.7169.6127.9168.0164.4133.7117.5229.9178.6140.988.8304.0139.4135.5135.7238.4158.6142.0107.5169.8149.1102.2123.8185.1127.8104.7101.9117.8110.8102.6120.2NANANANA
us-gaap:PaymentsToAcquireInvestments ▃█▁▅█▃▅▆▅▆4243.06978.02784.05573.07239.03896.05644.06197.05044.06069.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▃█▁▃▄▅▂▄▃▃▂▃▄▃▇▂▂▅▅▃▃▃▃▃▂▄▃▃▃▄▃▃▄▃▅▆▅▂▃▄▃▃▃▄▂▂-820.03388.0-2367.0-984.0105.0679.0-1304.0144.0-677.0-429.0-1561.0-340.6288.3-627.72433.2-1676.8-1563.81234.3581.5-524.1-437.1-353.2-1012.4-593.9-1703.0311.9-528.9-560.9-474.1-258.6-725.8-536.8123.9-579.1547.81566.31141.8-1167.0-744.0234.1-723.5-785.8-939.8167.5-1239.3-1157.7NANANANA
us-gaap:ProceedsFromIssuanceOfLongTermDebt ▁▅▁▁▄▁▁▄▁▁▁▁▁▂█▁▁▁▁▁0.03462.0-1.01.02184.0300.00.02473.0-2.02.00.00.1-1.1836.05457.80.00.00.00.00.0NANA0.0-2.2NANA0.02700.0NANA0.0NANANA1533.73212.3NANA0.01097.4NANA0.0NANANANANANANA
us-gaap:RepaymentsOfLongTermDebt NANA968.0809.0103.052.0200.0850.010.063.0291.0730.00.3662.71885.20.0528.8401.10.00.00.00.0310.7456.51913.616.4-0.71685.720.924.20.01245.00.0556.90.1800.1100.3350.81.31.11.9700.81.7408.256.715.1NANANANA
 us-gaap:RepaymentsOfLongTermDebt us-gaap:DebtInstrument us-gaap:ConvertibleDebtNANA67.00.0103.052.0200.00.010.063.0284.080.00.337.7NANANANANANANANA3800.7-98.7-1646.3NANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PaymentsOfDividends ██▆▇▇▇▅▅▅▅▅▅▅▅▄▄▄▄▄▄▄▄▄▄▄▄▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁278.0277.0234.0238.0242.0240.0202.0204.0206.0206.0193.0195.0196.4191.9179.5181.4171.8172.2171.3171.1170.9170.7163.1163.0163.9166.6117.6119.2120.5123.4110.5111.4112.7113.487.190.793.595.885.788.291.192.8NANANANANANANANA
us-gaap:PaymentsForRepurchaseOfCommonStock ▃▃▇▅▁▃▂▄▃▂▃▃▃▃▃▆▃▁▁▁▁▁▁▁▄▅▃▄▅▇▃▄▂▃▄▄▃▄▄▅▄▄▆▃██480.0447.01358.0758.055.0529.0305.0644.0458.0294.0493.0397.0400.3394.7362.31126.4458.350.70.00.00.00.00.0105.2636.5774.1343.0578.6814.41262.8449.7554.9275.3340.2668.0655.2493.8679.8685.6897.9714.7741.61015.2463.71493.01388.4NANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument antm:OnePointFiveZeroPercentDueTwoThousandTwentySixNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument antm:PointFourFiveZeroPercentDueTwoThousandTwentyThreeNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument antm:ThreePointSevenZeroZeroPercentDueTwoThousandTwentyOneNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument antm:ThreePointSixZeroPercentDueTwoThousandFiftyOneNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument antm:TwoPointFiveFiveZeroPercentDueTwoThousandThirtyOneNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:SubsequentEventType antm:ThreePointSevenZeroZeroPercentDueTwoThousandTwentyOne,us-gaap:SubsequentEventNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2000000.02000000.03000000.03000000.03000000.03000000.03000000.03000000.03000000.03000000.03000000.03000000.02600000.02600000.02600000.02600000.02600000.02600000.02600000.02600000.02600000.02600000.02600000.02600000.02600000.02600000.02700000.02700000.02700000.02900000.02900000.03000000.03000000.03000000.03000000.03100000.03200000.03300000.03400000.03500000.03600000.03700000.03800000.04500000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of 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

Shares Outstanding

us-gaap:SharesOutstanding us-gaap:StatementEquityComponents

us-gaap:SharesOutstanding

us-gaap:CommonStock


Shares
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-31
Value243244245249252252252253255257257258260255256257263265263263263262261261261264268270274281293296299300304314325331339349362368377394403449503
Percentage of SharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value247248254255256260261262265264262267270270268268267269274280284286292304303305321331339360371379402421446
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value244245251252252255256257259258255260264264263263261261263266273276284297299303318327335356366374397417441
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount


Antidilutive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value0.30.41.61.60.90.70.70.20.00.80.31.00.42.52.61.71.01.20.40.11.40.60.15.311141010108.112171816
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value7.336.82.230.889.026.033.694.644.446.031.643.74.075.134.82.873.233.821.42.352.972.690.692.513.273.251.882.312.642.460.52.212.672.921.522.171.962.560.971.921.922.481.411.861.731.996.021.551.441.17
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value7.256.712.190.878.915.943.624.554.365.911.613.623.984.994.672.83.163.731.372.32.912.630.682.433.133.091.82.222.562.40.492.162.642.891.512.151.942.530.961.91.892.441.41.841.711.965.951.531.431.16
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Benefits Losses And Expenses

us-gaap:BenefitsLossesAndExpenses

us-gaap:BenefitsLossesAndExpenses


Benefits
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value31498302093121330769261152753226309251852401322721228302200921440207572255621307212012101021055202672000718976198131877218457174821809717469172091672917111170871658516400150541432714358141051483914352140931346713973134351330113737
Percentage of BenefitsLossesAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues93.093.398.198.889.292.996.094.494.392.197.794.793.492.199.595.094.693.397.094.793.293.598.194.392.291.895.394.193.293.795.695.193.292.796.993.393.291.596.993.293.390.495.492.092.091.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value197113208133643030811937126713791914250931991110412557558821116464618798613104438621931345489878845336678430928376865620976318471793953401970696975
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues5.84.12.61.210.42.73.44.75.47.81.14.04.34.95.53.43.95.02.12.93.73.00.52.23.14.91.82.64.84.71.93.82.45.32.45.64.06.32.13.15.36.42.76.74.86.5

Cost Of Goods And Services Sold

us-gaap:CostOfGoodsAndServicesSold

us-gaap:CostOfGoodsAndServicesSold


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2614231325222222222519841149745980.00.00.00.0
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0
Percentage of Revenues7.77.17.97.17.66.74.22.80.40.00.00.00.0

Gains Losses On Extinguishment Of Debt

us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:GainsLossesOnExtinguishmentOfDebt


Gains
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value-5.0-2.0-30.0-3.0-1.0-3.00.00.01.06.01.00.9-19.1-282.40.00.00.00.00.00.00.07.52.32.9-3.4-0.3-74.8-3.0-3.00.0-145.30.00.00.00.0
Percentage of GainsLossesOnExtinguishmentOfDebt100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.00.00.0
Percentage of Revenues-0.0-0.0-0.1-0.0-0.0-0.00.00.00.00.00.00.0-0.1-1.20.00.00.00.00.00.00.00.00.00.0-0.0-0.0-0.4-0.0-0.00.0-0.80.00.00.00.0

us-gaap:GainsLossesOnExtinguishmentOfDebt us-gaap:DebtInstrument

antm:Otherseniorunsecurednotes


Gains
Period End2020-09-302015-12-31
Value-30.00.0
Percentage of GainsLossesOnExtinguishmentOfDebt100.00.0
Percentage of Revenues-0.10.0
Percentage of Revenues antm:Otherseniorunsecurednotes0.00.0

us-gaap:ConvertibleDebt


Gains
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312015-12-312015-09-302015-06-30
Value-5.0-2.00.0-3.0-1.0-3.00.00.01.06.07.52.32.9
Percentage of GainsLossesOnExtinguishmentOfDebt100.0100.0-0.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0
Percentage of Revenues-0.0-0.00.0-0.0-0.0-0.00.00.00.00.00.00.00.0
Percentage of Revenues us-gaap:ConvertibleDebt0.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value2353217661138931492089109814891453194554212421503178012411181205151565811361448131237411291558156988710871263113046987912081282480101910481309
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues7.06.71.91.210.87.14.05.65.77.92.35.36.67.90.55.05.46.73.05.36.86.51.95.77.88.24.75.96.86.32.64.96.87.33.16.66.88.5

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value2353217661138931492089109814891453194554312421503178012411181205151565811361448131237411291558156988710871263113045988212101287481102510481309478104510071427752113611291335433911171052893
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues7.06.71.91.210.87.14.05.65.77.92.35.36.67.90.55.05.46.73.05.36.86.51.95.77.88.24.75.96.86.32.64.96.87.33.16.76.88.53.16.86.79.65.17.87.88.822.87.26.85.9

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value55250960167873566164306314394118282450467-1106.537235050529051866760919347469870338045653243816722641040117334405453142362305500203397407458
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues1.61.60.20.53.01.90.61.11.21.60.51.22.02.1-4.91.71.62.21.32.43.13.01.02.43.53.72.02.52.92.50.91.32.32.30.12.22.62.90.92.42.03.41.42.72.83.0

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value20519219119820119419018518418718918819118416315018923517717218518717916415415415315514514614515115115315113311710911210810310511310610099
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.60.60.60.60.70.70.70.70.70.80.80.80.80.80.70.70.81.00.80.80.90.90.90.80.80.80.80.80.80.80.80.80.90.91.00.90.80.70.70.70.70.70.80.70.70.7

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value179316655512222276152393411831139155142496010531312123074685510093686177807031806548598655066307317011486568008854646916438563356837019265487397228762741730693580
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues5.35.11.70.77.85.13.44.44.56.31.84.14.65.85.43.33.84.51.72.93.63.50.93.34.34.52.73.44.03.90.83.74.55.03.04.54.25.62.24.44.66.23.75.15.05.814.44.74.53.8

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value17931665222227615231183113915514259601054131212307468551009368617780703180654859865506630731701148656800885464691643856335683701926548739722876
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.2100.0100.1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues5.35.10.77.85.14.44.56.31.84.14.65.85.43.33.84.51.72.93.63.50.93.34.34.52.73.44.03.90.83.74.55.03.04.54.25.62.24.44.66.23.75.15.05.8
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Attributable To Noncontrolling Interest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest


Net
Period End2021-06-302021-03-31
Value8000000.0-2000000.0
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0
Percentage of Revenues0.0-0.0

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Net
Period End2021-06-302021-03-31
Value8000000.02000000.0
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0-100.0
Percentage of Revenues0.00.0
Percentage of Revenues us-gaap:NoncontrollingInterest0.00.0

Net Investment Income

us-gaap:NetInvestmentIncome

us-gaap:NetInvestmentIncome


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value40029128628057254268242285210262250229229238220200207212200194171162161186167177174188183176167153162179168169169160170187184194205202201
Percentage of NetInvestmentIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues1.20.90.90.90.20.91.00.91.10.91.11.11.01.01.11.00.90.91.00.90.90.80.80.80.90.90.90.91.01.01.00.90.90.91.21.11.11.11.01.11.21.21.31.41.41.3

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2081216160520133602194109815281433194075012491559186738198212271585653107815001570439122115121579885119112221118392100912311367431100399112125129729461350693103910581286
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues6.16.71.90.611.57.44.05.75.67.93.25.46.88.31.74.45.57.03.05.07.07.72.26.17.68.34.76.46.66.32.25.66.97.72.86.56.47.93.36.36.39.14.77.17.38.5

us-gaap:OperatingIncomeLoss us-gaap:ProductOrService

antm:CommercialSpecialty


Operating
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-31
Value7911268-234.0137214209309831587833105214085349671302637107512936199121267915919886
Percentage of OperatingIncomeLoss38.058.7-116.440.864.760.968.681.866.767.575.454.478.982.159.271.782.350.760.380.276.975.279.2
Percentage of Revenues2.33.9-0.84.74.83.53.96.43.64.66.22.44.35.83.05.06.43.14.66.74.95.05.0
Percentage of Revenues antm:CommercialSpecialty0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

antm:GovernmentBusinessSegment


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-31
Value8684781692461618411585616478383434466537490457293318478450325626609324283313239
Percentage of OperatingIncomeLoss41.722.127.9122.448.218.753.340.333.419.757.937.334.526.346.623.920.144.430.020.751.340.320.523.825.621.4
Percentage of Revenues2.61.50.50.85.51.42.12.31.91.61.92.02.32.22.01.31.42.22.11.63.13.01.71.51.71.3
Percentage of Revenues antm:GovernmentBusinessSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

antm:IngenioRxSegment


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value4054073633453043490.00.0
Percentage of OperatingIncomeLoss19.518.860.0171.69.015.90.00.0
Percentage of Revenues1.21.31.11.11.01.20.00.0
Percentage of Revenues antm:IngenioRxSegment0.00.00.00.00.00.00.00.0

antm:OtherSegment


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-31
Value178.0-50.0-156.06614-8.0-18.0-28.0-30.011-50.0-31.2-31.4-10.1-34.2-35.6-38.5-25.6-47.6-23.9-9.6-12.1-8.3-10.2-7.0
Percentage of OperatingIncomeLoss0.80.4-8.3-77.62.00.6-0.7-1.2-2.0-1.51.5-4.0-2.0-1.7-1.0-2.8-2.2-3.6-1.7-3.0-2.0-0.6-0.8-0.7-0.8-0.6
Percentage of Revenues0.10.0-0.2-0.50.20.0-0.0-0.1-0.1-0.10.0-0.2-0.1-0.1-0.0-0.2-0.2-0.2-0.1-0.2-0.1-0.0-0.1-0.0-0.1-0.0
Percentage of Revenues antm:OtherSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax


Other
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-6000000.06000000.01000000.01000000.0-1000000.01000000.0-1000000.000-1000000.00-800000.0400000.0200000.0500000.0700000.01400000.01100000.0400000.0-700000.01300000.0-1000000.0400000.0700000.0-3500000.0-1400000.0-2400000.0-300000.0-200000.0700000.01200000.0300000.0-800000.0800000.0500000.0-1400000.0700000.0
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.00.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-0.00.00.00.0-0.00.0-0.00.00.0-0.00.0-0.00.00.00.00.00.00.00.0-0.00.0-0.00.00.0-0.0-0.0-0.0-0.0-0.00.00.00.0-0.00.00.0-0.00.0

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value180-347.0262142754-712.03.084240363-175.0-29.0-62.2-207.6248.926106961.017-89.8-76.4-216.6-237.566-161.2-141.914714418822-369.743-87.8174-22.8120
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.5-1.10.80.52.6-2.40.00.30.91.5-0.7-0.1-0.3-0.90.10.00.10.50.40.00.1-0.4-0.4-1.1-1.20.3-0.8-0.80.80.81.10.1-2.10.2-0.61.1-0.10.8

Other Income

us-gaap:OtherIncome

us-gaap:OtherIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value17041685152616591543158730962651167615451485152914673011106.05.05.89.1109.58.08.8121312109.59.5-320.2124115120106141341513108.58.77.74.6185.9
Percentage of OtherIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues5.05.24.85.35.35.411.39.96.66.36.46.66.40.10.10.00.00.00.00.00.00.00.00.00.10.10.10.10.10.1-1.80.70.70.70.70.90.20.10.10.10.10.10.10.00.10.0

Policyholder Benefits And Claims Incurred Net

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet


Policyholder
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value24763236992408822921195472148921383207532036819282189361818517727170451867218103179171754217567169221680515538163151546915205141261485714211141211366414580140751383213748123631198412093117711243412062119221122811353112051098511382
Percentage of PolicyholderBenefitsAndClaimsIncurredNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues73.273.275.773.666.872.578.077.880.078.281.078.277.375.682.380.780.077.980.979.178.376.680.877.776.074.278.376.676.476.581.478.377.777.779.678.178.576.481.278.378.975.477.576.876.075.4

Premiums Earned Net

us-gaap:PremiumsEarnedNet

us-gaap:PremiumsEarnedNet


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value28533276762710826392250922551724036237932350122843218192145121248209022108620797208132095120137197861994818988187451851318516176101757717226170681651716609165801649316435141601403714161141381419014181139131368413439133661325713909
Percentage of PremiumsEarnedNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues84.385.585.284.785.786.187.789.292.392.693.492.392.692.793.092.792.993.092.792.493.093.692.993.092.592.492.692.892.492.592.892.392.792.991.191.491.991.792.692.192.191.991.891.691.792.1

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-06-302020-03-31
Value1801166722761523
Percentage of ProfitLoss100.0100.0100.0100.0
Percentage of Revenues5.35.17.85.1

Realized Investment Gains Losses

us-gaap:RealizedInvestmentGainsLosses

us-gaap:RealizedInvestmentGainsLosses


Realized
Period End2021-06-302021-03-312020-06-302020-03-312016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value147-26.030-78.0-125.130-11.992464325654110595541610254701064194415747613648
Percentage of RealizedInvestmentGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.4-0.10.1-0.3-0.60.2-0.10.50.20.20.10.40.20.60.50.30.10.70.40.50.70.30.60.30.40.30.40.30.3

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value3385132385318243115829264296212740726674254662466623373232512294322537226802242622407225252171421403214562028820187199012001519051189841855718473178591790117969177951768715536153531540715415153171539815100148941464714598144571509819046154251541315143
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Selling General And Administrative Expense

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:SellingGeneralAndAdministrativeExpense


Selling
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3821392543185305404637813502341832783166361835463428342833933011305331913264312429693200326830803040314530322968288528612537258024702365241220782081216522282119201120762447206321542174
Percentage of SellingGeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues11.312.113.617.013.812.812.812.812.912.815.515.314.915.215.013.413.614.215.014.613.815.816.215.515.216.516.016.015.616.014.214.413.913.415.513.513.514.014.513.813.313.916.714.114.914.4

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value9609795683866158657487976823997745377809758517452371571744457436773300705406830968237689436508364399640626385861717623356426365546620656205862303616855957460263596125940858955558175453552496520185254950877509185016652125
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities

srt:ParentCompany


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-31
Value558025274948734
Percentage of Assets64.468.168.1
Percentage of Assets64.468.168.1
Percentage of Assets srt:ParentCompany100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value6105161765534165265353521507064572546477450584452543030453514564246288440374236141805428513998239655398294031138673390994120141211378133776437926373403480935455350793509035152320013089128968287302883126695269392635427262
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets63.564.661.760.860.861.559.059.759.459.760.160.961.463.162.462.061.362.261.461.662.263.162.762.764.162.960.960.960.960.558.458.858.859.159.657.356.655.255.254.952.552.952.552.3

us-gaap:Liabilities us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilitiesus-gaap:
Period End2020-12-312019-12-312018-12-31
Value226032102120193
Percentage of Liabilities42.346.046.9
Percentage of Assets26.127.128.2
Percentage of Assets srt:ParentCompany40.539.941.4

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value9609795683866158657487976823997745377809758517452371571744457436773300705406830968237689436508364399640626385861717623356426365546620656205862303616855957460263596125940858955558175453552496520185254950877509185016652125
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesAndStockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilities
Period End2020-12-312019-12-312018-12-31
Value558025274948734
Percentage of LiabilitiesAndStockholdersEquity64.468.168.1
Percentage of Assets64.468.168.1
Percentage of Assets srt:ParentCompany100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value34968338533319933921344553169331728313323079329998285412909428725270122650225948264312609125100247442423323547230442323623062243342425124294243762434524765248082453224318238022381623643235282328823718241812397823812243612379024519248632143122990
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets36.435.438.339.239.238.541.040.340.640.339.939.138.636.937.638.038.737.838.638.437.836.937.337.335.937.139.139.139.139.541.641.241.240.940.442.743.444.844.845.147.547.147.50.00.00.047.70.00.0

us-gaap:StockholdersEquity dei:LegalEntity

antm:CaliforniaDepartmentOfManagedHealthCareRegulatedEntities


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value38513359312529172225183816961449
Percentage of StockholdersEquity11.610.610.911.08.98.07.05.9
Percentage of Assets4.44.34.44.13.43.02.72.4
Percentage of Assets antm:CaliforniaDepartmentOfManagedHealthCareRegulatedEntities0.00.00.00.00.00.00.00.0

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Stockholders
Period End2020-12-312019-12-312018-12-31
Value331993172828541
Percentage of StockholdersEquity100.0100.0100.0
Percentage of Assets38.341.039.9
Percentage of Assets srt:ParentCompany59.560.158.6

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value-17.0-195.0150-112.0-254.0-1008.0-296.0-299.0-383.0-623.0-986.0-811.0-782.8-720.6-101.5-126.0-134.9-161.8-267.9-363.9-364.9-382.4-292.6-216.20.4237171333475327183-4.8-27.234229938621223511413234325122437214016668-895.7156
Percentage of StockholdersEquity-0.0-0.60.5-0.3-0.7-3.2-0.9-1.0-1.2-2.1-3.5-2.8-2.7-2.7-0.4-0.5-0.5-0.6-1.1-1.5-1.5-1.6-1.3-0.90.01.00.71.41.91.30.7-0.0-0.11.41.31.60.91.00.50.61.41.00.91.50.60.70.3-4.20.7
Percentage of Assets-0.0-0.20.2-0.1-0.3-1.2-0.4-0.4-0.5-0.8-1.4-1.1-1.1-1.0-0.1-0.2-0.2-0.2-0.4-0.6-0.6-0.6-0.5-0.30.00.40.30.50.80.50.3-0.0-0.00.60.50.70.40.40.20.30.70.50.40.00.00.00.10.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value910992539244935293609338944895249494948295369720974784898547876588978893880587418677861685558687870799431006210094101541000310765107691073810697108531086911204113691167912009124151252312862134031364814552151921684318441
Percentage of StockholdersEquity26.027.327.827.627.229.529.830.430.831.633.433.433.931.432.333.833.734.135.135.335.836.637.137.437.840.941.541.641.741.143.543.443.844.045.645.647.448.350.250.651.352.254.055.057.459.461.178.680.2
Percentage of Assets9.59.710.710.810.611.312.212.212.512.713.313.113.111.612.112.813.012.913.513.613.513.513.913.913.515.216.216.316.316.218.117.918.018.018.419.520.521.722.522.924.424.625.60.00.00.029.10.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value2.02.03.03.03.03.03.03.03.03.03.03.02.62.62.62.62.62.62.62.62.62.62.62.62.62.62.72.72.72.92.93.03.03.03.03.13.23.33.43.53.63.73.84.04.04.34.55.05.6
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value258742479323802246782534623360225732210421679211361998820182197571924118054173061766717357165601636415918153101477814761143521415014014138631374414011138131404013817132751264712556122241192111490115721141811199107211058199979795959854794387
Percentage of StockholdersEquity74.073.271.772.873.673.771.170.570.470.570.069.468.871.268.166.766.866.566.066.165.765.064.163.562.258.157.857.156.457.655.856.656.354.653.152.751.750.749.348.847.246.745.043.442.040.038.625.619.1
Percentage of Assets26.925.927.528.528.828.329.128.428.628.427.927.126.626.225.625.325.925.225.425.424.824.023.923.722.321.622.622.322.122.723.223.323.222.321.522.522.422.722.122.022.422.021.40.00.00.018.40.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value5023854495457514545046764412563903339504378053661134321371083737036974362623697337130379813431432924329573296530862315393320234740322283222732428318062974529596289002866028268296402847027543270972755226756268192614028070
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets52.357.052.852.553.250.150.450.849.849.148.049.850.350.451.454.154.455.152.751.151.451.650.050.651.753.051.951.952.051.649.949.148.548.247.953.152.252.552.152.452.652.752.153.9

us-gaap:AssetsCurrent us-gaap:ConsolidatedEntities

srt:ParentCompany


Assets
Period End2020-12-312019-12-312018-12-31
Value258840202615
Percentage of AssetsCurrent5.710.37.6
Percentage of Assets3.05.23.7
Percentage of Assets srt:ParentCompany4.67.65.4

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value5258932657413984602853454937419040784482393442604682463036086097456167724075254615821676211315471553139721511717178419711582218513471665248424421953227922012508169924021788224620273526481621832767
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.59.76.64.66.96.56.45.45.46.05.55.76.36.35.18.96.79.86.34.02.52.63.42.52.42.13.52.82.93.22.73.62.32.84.24.43.64.34.24.83.34.73.60.00.00.09.20.00.0

us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:ConsolidatedEntities

srt:ParentCompany


Cash
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value70018181290956883
Percentage of CashAndCashEquivalentsAtCarryingValue12.236.832.826.521.7
Percentage of Assets0.82.31.81.41.4
Percentage of Assets srt:ParentCompany1.33.42.60.00.0

Other Assets Current

us-gaap:OtherAssetsCurrent

us-gaap:OtherAssetsCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value47014693406041474260413523192113215121722104287531063552224918221774182317811906208324941555187821782534147419222165241716771807182318911829187519131920185916001601163915341268
Percentage of OtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.94.94.74.84.85.03.02.72.82.92.93.94.24.83.22.72.62.62.73.03.33.92.53.03.43.92.43.13.53.92.83.03.13.23.13.43.53.73.63.03.13.23.12.4

us-gaap:OtherAssetsCurrent us-gaap:ConsolidatedEntities

srt:ParentCompany


Other
Period End2020-12-312019-12-312018-12-31
Value800462320
Percentage of OtherAssetsCurrent19.719.915.2
Percentage of Assets0.90.60.4
Percentage of Assets srt:ParentCompany1.40.90.7

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value732764795548437241394058376434853220265524232360
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets8.58.47.86.26.46.66.15.85.55.14.84.5

us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType

antm:DataProcessingEquipmentAndSoftware


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value121812641266108010241046940
Percentage of PropertyPlantAndEquipmentGross16.619.522.824.724.725.825.0
Percentage of Assets1.41.61.81.51.61.71.5
Percentage of Assets antm:DataProcessingEquipmentAndSoftware0.00.00.00.00.00.00.0

us-gaap:BuildingAndBuildingImprovements


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value174169169167215216279384406392388
Percentage of PropertyPlantAndEquipmentGross2.42.63.03.85.25.37.411.012.614.816.0
Percentage of Assets0.20.20.20.20.30.40.50.60.70.80.8
Percentage of Assets us-gaap:BuildingAndBuildingImprovements0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LandAndLandImprovements


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1717181721212535455251
Percentage of PropertyPlantAndEquipmentGross0.20.30.30.40.50.50.71.01.42.02.1
Percentage of Assets0.00.00.00.00.00.00.00.10.10.10.1
Percentage of Assets us-gaap:LandAndLandImprovements0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LeaseholdImprovements


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value671715563494462429356325303190165
Percentage of PropertyPlantAndEquipmentGross9.211.010.111.311.210.69.59.39.47.26.8
Percentage of Assets0.80.90.80.70.70.70.60.50.50.40.3
Percentage of Assets us-gaap:LeaseholdImprovements0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:SoftwareAndSoftwareDevelopmentCosts


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value52474314353226122416234421621879167212951145
Percentage of PropertyPlantAndEquipmentGross71.666.663.759.858.457.857.453.951.948.847.3
Percentage of Assets6.15.64.93.73.73.83.53.22.82.52.3
Percentage of Assets us-gaap:SoftwareAndSoftwareDevelopmentCosts0.00.00.00.00.00.00.00.00.00.00.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value38443346281321972162203818201683-1482.2123712671260
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.44.33.93.13.33.32.92.8-2.52.42.52.4

Amortization Of Intangible Assets

us-gaap:AmortizationOfIntangibleAssets

us-gaap:AmortizationOfIntangibleAssets


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value90809293938382848587939193794441404146474750576060525260545443666767636359586362565659606060
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value37333533348333633427335031332921283727992735259223922237217420491975195719772006198919982019193019311915194418481829181118011806176917381738153614781454141813161212118611551099
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.93.74.03.93.94.14.03.83.73.83.83.53.23.13.13.02.92.83.03.13.13.13.33.13.02.93.13.02.92.93.03.03.02.92.92.82.72.82.72.52.42.32.32.1

us-gaap:PropertyPlantAndEquipmentNet us-gaap:ConsolidatedEntities

srt:ParentCompany


Property
Period End2020-12-312019-12-312018-12-31
Value209170186
Percentage of PropertyPlantAndEquipmentNet6.05.46.8
Percentage of Assets0.20.20.3
Percentage of Assets srt:ParentCompany0.40.30.4

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value243992170821691216872164121661205002050020500205002050420468204142018519231175871756117561175611756217562175621756217550175411757017082170821708216916169171749717488174891751014469145341385813858138461326313264132641326413461
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets25.422.725.025.124.626.326.526.327.027.528.627.527.527.527.325.725.725.527.027.327.427.528.528.227.326.827.527.527.427.428.429.029.329.429.725.926.726.426.626.426.126.126.425.40.0

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

antm:BeaconHealthOptions, antm:OtherSegment


Goodwillus-gaap:
Period End2021-06-302021-03-312020-12-31
Value108110811072
Percentage of Goodwill4.45.04.9
Percentage of Assets1.11.11.2
Percentage of Assets antm:BeaconHealthOptions antm:OtherSegment0.00.00.0

antm:BeaconHealthOptions, us-gaap:AllOtherSegments


Goodwillus-gaap:
Period End2020-09-302020-06-302020-03-31
Value106710701049
Percentage of Goodwill4.94.94.8
Percentage of Assets1.21.21.3
Percentage of Assets antm:BeaconHealthOptions us-gaap:AllOtherSegments0.00.00.0

antm:MMMHoldings, antm:GovernmentBusinessSegment


Goodwillus-gaap:
Period End2021-06-30
Value2171
Percentage of Goodwill8.9
Percentage of Assets2.3
Percentage of Assets antm:MMMHoldings antm:GovernmentBusinessSegment0.0

antm:MyNEXUS, antm:OtherSegment


Goodwillus-gaap:
Period End2021-06-30
Value520
Percentage of Goodwill2.1
Percentage of Assets0.5
Percentage of Assets antm:MyNEXUS antm:OtherSegment0.0

us-gaap:Goodwill us-gaap:StatementBusinessSegments

antm:CommercialSpecialtyBusinessSegment


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value115931155111551118171181711818118181155411555
Percentage of Goodwill53.456.356.361.567.367.369.268.366.0
Percentage of Assets13.414.916.116.818.219.119.019.419.6
Percentage of Assets antm:CommercialSpecialtyBusinessSegment0.00.00.00.00.00.00.00.00.0

antm:GovernmentBusinessSegment


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value833182798953740157435743526353635334
Percentage of Goodwill38.440.443.738.532.732.730.831.730.5
Percentage of Assets9.610.712.510.58.89.38.59.09.0
Percentage of Assets antm:GovernmentBusinessSegment0.00.00.00.00.00.00.00.00.0

antm:IngenioRxSegment


Goodwillus-gaap:
Period End2020-12-31
Value48
Percentage of Goodwill0.2
Percentage of Assets0.1
Percentage of Assets antm:IngenioRxSegment0.0

us-gaap:AllOtherSegments


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value17196700.0110.00.0
Percentage of Goodwill7.93.30.00.10.00.0
Percentage of Assets2.00.90.00.00.00.0
Percentage of Assets us-gaap:AllOtherSegments0.00.00.00.00.00.0

Indefinite Lived Intangible Assets Excluding Goodwill

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill


Indefinite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value751572907290729072907290699572677536638763876386
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets8.79.410.210.311.211.811.312.212.812.312.712.3

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass

us-gaap:LicensingAgreements


Indefinite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value1216991991991991991696696676116116116
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill16.213.613.613.613.613.610.09.69.01.81.81.8
Percentage of Assets1.41.31.41.41.51.61.11.21.10.20.20.2
Percentage of Assets us-gaap:LicensingAgreements0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Trademarks


Indefinite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value6299629962996298629862986298629865885998
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill83.886.486.486.486.486.490.086.787.493.9
Percentage of Assets7.38.18.88.99.710.210.110.611.211.5
Percentage of Assets us-gaap:Trademarks0.00.00.00.00.00.00.00.00.00.0

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill


Intangible
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value105409352940594979577961386748756884089259007910192249076836878407882792379648012805981078158821582758293795880108071838784418921898890559102821081267878793179947883794079968259
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.09.810.911.010.911.711.211.311.712.012.612.212.412.411.911.511.611.512.212.412.612.713.213.212.912.712.812.913.013.614.214.815.115.215.414.714.915.015.215.215.515.615.915.8

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:FiniteLivedIntangibleAssetsNet


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value189013841717107867486796211731566154416091872
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.21.82.41.51.01.41.62.02.73.03.23.6

us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:ContractualRights


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value2091301431148492899510272
Percentage of FiniteLivedIntangibleAssetsNet11.19.48.310.612.510.69.38.26.54.7
Percentage of Assets0.20.20.20.20.10.10.10.20.20.1
Percentage of Assets us-gaap:ContractualRights0.00.00.00.00.00.00.00.00.00.0

us-gaap:CustomerRelationships


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value141410311310847551724845104414241426
Percentage of FiniteLivedIntangibleAssetsNet74.874.576.378.681.783.587.889.091.092.3
Percentage of Assets1.61.31.81.20.81.21.41.82.42.7
Percentage of Assets us-gaap:CustomerRelationships0.00.00.00.00.00.00.00.00.00.0

us-gaap:OtherIntangibleAssets


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value267223264116385128333945
Percentage of FiniteLivedIntangibleAssetsNet14.116.115.410.85.85.92.92.82.53.0
Percentage of Assets0.30.30.40.20.10.10.00.10.10.1
Percentage of Assets us-gaap:OtherIntangibleAssets0.00.00.00.00.00.00.00.00.00.0

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset us-gaap:BalanceSheetLocation

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherNoncurrentAssets


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value683628646679917915575577637606
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.70.70.81.01.10.70.70.80.8
Percentage of Assets us-gaap:OtherNoncurrentAssets0.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingLeaseRightOfUseAsset us-gaap:ConsolidatedEntities

srt:ParentCompany


Operating
Period End2020-12-312019-12-31
Value9599
Percentage of OperatingLeaseRightOfUseAsset14.717.2
Percentage of Assets0.10.1
Percentage of Assets srt:ParentCompany0.20.2

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value168915631438184919501833135016671608145375810749508325658507786404671168862609485661864746619664675635645456464483486451458445433539557542488393
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.81.61.72.12.22.21.72.12.11.91.11.41.31.10.81.21.10.90.71.81.31.00.81.11.31.11.01.11.11.01.10.80.80.80.80.80.80.80.81.01.11.11.00.8

us-gaap:OtherAssetsNoncurrent us-gaap:ConsolidatedEntities

srt:ParentCompany


Other
Period End2020-12-312019-12-312018-12-31
Value211263225
Percentage of OtherAssetsNoncurrent14.719.529.7
Percentage of Assets0.20.30.3
Percentage of Assets srt:ParentCompany0.40.50.5

Equity Securities Fv Ni

us-gaap:EquitySecuritiesFvNi

us-gaap:EquitySecuritiesFvNi


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value1746363015593075347057010091493
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.83.81.83.63.90.71.32.1

us-gaap:EquitySecuritiesFvNi us-gaap:ConsolidatedEntities

srt:ParentCompany


Equity
Period End2020-12-312019-12-312018-12-31
Value43925386
Percentage of EquitySecuritiesFvNi28.225.15.8
Percentage of Assets0.50.30.1
Percentage of Assets srt:ParentCompany0.80.50.2

Accounts Payable And Accrued Liabilities Current

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value55985329549355505257505841984445402839514959628659315816502444543815362240143717427241643318329344334454365134474263411334263301328629363132264827882809312428142599266729422994
Percentage of AccountsPayableAndAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.85.66.36.46.06.15.45.75.35.36.98.48.07.97.16.55.65.36.25.86.76.55.45.36.96.85.95.66.86.75.85.55.54.95.34.75.15.46.05.45.15.25.95.7

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent us-gaap:ConsolidatedEntities

srt:ParentCompany


Accounts
Period End2020-12-312019-12-312018-12-31
Value4298871429
Percentage of AccountsPayableAndAccruedLiabilitiesCurrent7.821.128.8
Percentage of Assets0.51.12.0
Percentage of Assets srt:ParentCompany0.81.72.9

Accrued Income Taxes Current

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:AccruedIncomeTaxesCurrent


Accrued
Period End2021-03-312019-03-312018-12-312018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-03-312015-12-312015-09-302015-03-312014-12-312014-03-312013-12-312013-03-312012-12-312012-03-312011-12-31
Value1761050.01940.01871134910.0601630.03.62830.0970.02040.02650.0
Percentage of AccruedIncomeTaxesCurrent100.0100.00.0100.00.0100.0100.0100.00.0100.0100.00.0100.0100.00.0100.00.0100.00.0100.00.0
Percentage of Assets0.20.10.00.30.00.30.20.70.00.10.30.00.00.40.00.20.00.30.00.50.0

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value3379434749294532856128522270392361723234230902268221965241742450524755233562441222567231742129421036208162081019092183652067321305187531839519176184931635116042160341603015836140831617715955158251578614107141601400914673
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets35.236.334.033.032.432.830.529.930.430.430.732.533.033.833.135.733.133.632.732.732.532.630.929.532.232.530.229.630.830.027.426.626.927.026.925.229.730.430.430.027.727.827.928.2

us-gaap:LiabilitiesCurrent us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilities
Period End2020-12-312019-12-312018-12-31
Value286227482660
Percentage of LiabilitiesCurrent9.711.612.1
Percentage of Assets3.33.53.7
Percentage of Assets srt:ParentCompany5.15.25.5

Long Term Debt Current

us-gaap:LongTermDebtCurrent

us-gaap:LongTermDebtCurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value84970070015991603160315987008508518498496506501274127362411529289279273990.00.06246256256255095185180.13993995570.28139101274127445635970560
Percentage of LongTermDebtCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.90.70.81.81.81.92.10.91.11.11.21.10.90.91.81.90.91.71.41.41.40.60.00.01.01.01.01.00.80.80.90.00.70.70.90.01.51.72.52.40.90.71.40.1

us-gaap:LongTermDebtCurrent us-gaap:ConsolidatedEntities

srt:ParentCompany


Long
Period End2020-12-312019-12-312018-12-31
Value7001598849
Percentage of LongTermDebtCurrent100.0100.0100.0
Percentage of Assets0.82.11.2
Percentage of Assets srt:ParentCompany1.33.01.7

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent us-gaap:BalanceSheetLocation

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherCurrentLiabilities


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-03-31
Value144116110192193195158158
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.20.20.20.20.2
Percentage of Assets us-gaap:OtherCurrentLiabilities0.00.00.00.00.00.00.00.0

Other Liabilities Current

us-gaap:OtherLiabilitiesCurrent

us-gaap:OtherLiabilitiesCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value773010159605262457252520236923867393540373190330633023475334337883668364335813129276228832816228222462171186119031901180516741828184418481713176619581660165415821640155016171775
Percentage of OtherLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets8.010.67.07.28.26.34.85.05.25.44.54.44.44.74.75.55.45.35.54.94.34.54.63.73.53.33.03.13.12.92.83.03.13.12.93.23.63.23.23.03.23.03.23.4

us-gaap:OtherLiabilitiesCurrent us-gaap:ConsolidatedEntities

srt:ParentCompany


Other
Period End2020-12-312019-12-312018-12-31
Value494237235
Percentage of OtherLiabilitiesCurrent8.26.47.4
Percentage of Assets0.60.30.3
Percentage of Assets srt:ParentCompany0.90.40.5

Long Term Debt

us-gaap:LongTermDebt

us-gaap:LongTermDebt


Long
Period End2020-12-312020-03-312019-12-312018-12-312017-12-312016-12-312015-12-312015-09-302015-06-302014-12-312014-09-302013-12-312013-09-302012-12-312011-12-312010-12-312009-12-31
Value20035300193851806618656152861532415719160931475215163140911451414727969588538399
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets23.10.425.025.226.423.524.825.225.023.824.423.724.125.018.617.616.1

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtNoncurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value222172253419335190941987319005177871882017436173961721717300175151811017382137771508815449143581424214202148641532415719154681476414127145381403713932135731451414091140301417013395101358462842086228292854281478338
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets23.123.622.322.122.623.123.024.223.023.324.123.223.624.724.620.222.122.422.122.122.223.324.825.224.122.522.823.422.522.622.824.123.623.624.024.018.616.116.216.416.316.816.216.0

us-gaap:LongTermDebtNoncurrent us-gaap:ConsolidatedEntities

srt:ParentCompany


Long
Period End2020-12-312019-12-312018-12-31
Value193101776217192
Percentage of LongTermDebtNoncurrent99.999.999.9
Percentage of Assets22.322.924.0
Percentage of Assets srt:ParentCompany34.633.735.3

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value2397196120192375249722132227
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.52.02.32.72.82.72.9

Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanType

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Pension
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value8.05695167233
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent100.0100.0100.0100.0100.0
Percentage of Assets0.00.10.10.20.4
Percentage of Assets us-gaap:OtherPostretirementBenefitPlansDefinedBenefit0.00.00.00.00.0

us-gaap:PensionPlansDefinedBenefit


Pension
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value6560535660
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent812.5107.155.833.825.7
Percentage of Assets0.10.10.10.10.1
Percentage of Assets us-gaap:PensionPlansDefinedBenefit0.00.00.00.00.0

Minority Interest

us-gaap:MinorityInterest

us-gaap:MinorityInterest


Minority
Period End2021-06-302021-03-31
Value7865
Percentage of MinorityInterest100.0100.0
Percentage of Assets0.10.1

us-gaap:MinorityInterest us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Minority
Period End2021-06-302021-03-31
Value7865
Percentage of MinorityInterest100.0100.0
Percentage of Assets0.10.1
Percentage of Assets us-gaap:NoncontrollingInterest0.00.0

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value18691745181518391853169514201622166616121182114510749429259448988898831040147913199941228122510991035891852832836874945971101395710131025102996510199589631115
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.91.82.12.12.12.11.82.12.22.21.71.51.41.31.31.41.31.31.41.62.32.11.62.01.91.71.71.41.41.31.41.51.61.61.71.71.92.02.01.82.01.91.92.1

us-gaap:OtherLiabilitiesNoncurrent us-gaap:ConsolidatedEntities

srt:ParentCompany


Other
Period End2020-12-312019-12-312018-12-31
Value431511341
Percentage of OtherLiabilitiesNoncurrent23.736.028.8
Percentage of Assets0.50.70.5
Percentage of Assets srt:ParentCompany0.81.00.7

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent us-gaap:BalanceSheetLocation

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OtherNoncurrentLiabilities


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-03-31
Value833801847798815801482482
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.90.81.00.90.91.00.60.6
Percentage of Assets us-gaap:OtherNoncurrentLiabilities0.00.00.00.00.00.00.00.0

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value198188180195149
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.20.20.2

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo us-gaap:ConsolidatedEntities

srt:ParentCompany


Lessee
Period End2020-12-312019-12-31
Value1911
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo10.67.4
Percentage of Assets0.00.0
Percentage of Assets srt:ParentCompany0.00.0

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value175163156179136
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.20.20.2

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree us-gaap:ConsolidatedEntities

srt:ParentCompany


Lessee
Period End2020-12-312019-12-31
Value1611
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree10.38.1
Percentage of Assets0.00.0
Percentage of Assets srt:ParentCompany0.00.0

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value146134125157116
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0100.0100.0100.0100.0
Percentage of Assets0.20.10.10.20.1

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour us-gaap:ConsolidatedEntities

srt:ParentCompany


Lessee
Period End2020-12-312019-12-31
Value1312
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour10.410.3
Percentage of Assets0.00.0
Percentage of Assets srt:ParentCompany0.00.0

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value105948812587
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.1

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value324243236322135
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0100.0100.0100.0100.0
Percentage of Assets0.30.30.30.40.2

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive us-gaap:ConsolidatedEntities

srt:ParentCompany


Lessee
Period End2020-12-312019-12-31
Value5970
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive25.051.9
Percentage of Assets0.10.1
Percentage of Assets srt:ParentCompany0.10.1

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2021-06-302021-03-312020-12-312020-09-302019-09-302019-06-302019-03-312019-01-01
Value977917957990640699694728
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.01.01.11.10.80.90.90.0

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value10539739821028
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0100.0100.0100.0
Percentage of Assets1.11.01.11.2

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value76562538
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0100.0100.0100.0
Percentage of Assets0.10.10.00.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value34968338533319933921344553169331728313323079329998285412909428725270122650225948264312609125100247442423323547230442323623062243342425124294243762434524765248082453224318238022381623643235282328823718241812397823812243612379024519248632143122990
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets36.435.438.339.239.238.541.040.340.640.339.939.138.636.937.638.038.737.838.638.437.836.937.337.335.937.139.139.139.139.541.641.241.240.940.442.743.444.844.845.147.547.147.50.00.00.047.70.00.0

us-gaap:StockholdersEquity dei:LegalEntity

antm:CaliforniaDepartmentOfManagedHealthCareRegulatedEntities


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value38513359312529172225183816961449
Percentage of StockholdersEquity11.610.610.911.08.98.07.05.9
Percentage of Assets4.44.34.44.13.43.02.72.4
Percentage of Assets antm:CaliforniaDepartmentOfManagedHealthCareRegulatedEntities0.00.00.00.00.00.00.00.0

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Stockholders
Period End2020-12-312019-12-312018-12-31
Value331993172828541
Percentage of StockholdersEquity100.0100.0100.0
Percentage of Assets38.341.039.9
Percentage of Assets srt:ParentCompany59.560.158.6

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value-17.0-195.0150-112.0-254.0-1008.0-296.0-299.0-383.0-623.0-986.0-811.0-782.8-720.6-101.5-126.0-134.9-161.8-267.9-363.9-364.9-382.4-292.6-216.20.4237171333475327183-4.8-27.234229938621223511413234325122437214016668-895.7156
Percentage of StockholdersEquity-0.0-0.60.5-0.3-0.7-3.2-0.9-1.0-1.2-2.1-3.5-2.8-2.7-2.7-0.4-0.5-0.5-0.6-1.1-1.5-1.5-1.6-1.3-0.90.01.00.71.41.91.30.7-0.0-0.11.41.31.60.91.00.50.61.41.00.91.50.60.70.3-4.20.7
Percentage of Assets-0.0-0.20.2-0.1-0.3-1.2-0.4-0.4-0.5-0.8-1.4-1.1-1.1-1.0-0.1-0.2-0.2-0.2-0.4-0.6-0.6-0.6-0.5-0.30.00.40.30.50.80.50.3-0.0-0.00.60.50.70.40.40.20.30.70.50.40.00.00.00.10.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value910992539244935293609338944895249494948295369720974784898547876588978893880587418677861685558687870799431006210094101541000310765107691073810697108531086911204113691167912009124151252312862134031364814552151921684318441
Percentage of StockholdersEquity26.027.327.827.627.229.529.830.430.831.633.433.433.931.432.333.833.734.135.135.335.836.637.137.437.840.941.541.641.741.143.543.443.844.045.645.647.448.350.250.651.352.254.055.057.459.461.178.680.2
Percentage of Assets9.59.710.710.810.611.312.212.212.512.713.313.113.111.612.112.813.012.913.513.613.513.513.913.913.515.216.216.316.316.218.117.918.018.018.419.520.521.722.522.924.424.625.60.00.00.029.10.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value2.02.03.03.03.03.03.03.03.03.03.03.02.62.62.62.62.62.62.62.62.62.62.62.62.62.62.72.72.72.92.93.03.03.03.03.13.23.33.43.53.63.73.84.04.04.34.55.05.6
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value258742479323802246782534623360225732210421679211361998820182197571924118054173061766717357165601636415918153101477814761143521415014014138631374414011138131404013817132751264712556122241192111490115721141811199107211058199979795959854794387
Percentage of StockholdersEquity74.073.271.772.873.673.771.170.570.470.570.069.468.871.268.166.766.866.566.066.165.765.064.163.562.258.157.857.156.457.655.856.656.354.653.152.751.750.749.348.847.246.745.043.442.040.038.625.619.1
Percentage of Assets26.925.927.528.528.828.329.128.428.628.427.927.126.626.225.625.325.925.225.425.424.824.023.923.722.321.622.622.322.122.723.223.323.222.321.522.522.422.722.122.022.422.021.40.00.00.018.40.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-31
Value350463391833199344553169331728
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0
Percentage of Assets36.535.438.339.238.541.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2000000.02000000.03000000.03000000.03000000.03000000.03000000.03000000.03000000.03000000.03000000.03000000.02600000.02600000.02600000.02600000.02600000.02600000.02600000.02600000.02600000.02600000.02600000.02600000.02600000.02600000.02700000.02700000.02700000.02900000.02900000.03000000.03000000.03000000.03000000.03100000.03200000.03300000.03400000.03500000.03600000.03700000.03800000.04500000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of 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

Additional Paid In Capital

us-gaap:AdditionalPaidInCapital

us-gaap:AdditionalPaidInCapital


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value91099253924493529360933894489524949494829536972097478489854787658897889388058741867786168555868787079943100621009410154100031076510769107381069710853108691120411369116791200912415125231286215192
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.59.710.710.810.611.312.212.212.512.713.313.113.111.612.112.813.012.913.513.613.513.513.913.913.515.216.216.316.316.218.117.918.018.018.419.520.521.722.522.924.424.625.629.1

us-gaap:AdditionalPaidInCapital us-gaap:ConsolidatedEntities

srt:ParentCompany


Additional
Period End2020-12-312019-12-312018-12-31
Value924494489536
Percentage of AdditionalPaidInCapital100.0100.0100.0
Percentage of Assets10.712.213.3
Percentage of Assets srt:ParentCompany16.617.919.6

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value258742479323802246782534623360225732210421679211361998820182197571924118054173061766717357165601636415918153101477814761143521415014014138631374414011138131404013817132751264712556122241192111490115721141811199107219598
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets26.925.927.528.528.828.329.128.428.628.427.927.126.626.225.625.325.925.225.425.424.824.023.923.722.321.622.622.322.122.723.223.323.222.321.522.522.422.722.122.022.422.021.418.4

us-gaap:RetainedEarningsAccumulatedDeficit us-gaap:ConsolidatedEntities

srt:ParentCompany


Retained
Period End2020-12-312019-12-312018-12-31
Value238022257319988
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0
Percentage of Assets27.529.127.9
Percentage of Assets srt:ParentCompany42.742.841.0

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value-17.0-195.0150-112.0-254.0-1008.0-296.0-299.0-383.0-623.0-986.0-811.0-782.8-720.6-101.5-126.0-134.9-161.8-267.9-363.9-364.9-382.4-292.6-216.20.4237171333475327183-4.8-27.234229938621223511413234325122468
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-0.0-0.20.2-0.1-0.3-1.2-0.4-0.4-0.5-0.8-1.4-1.1-1.1-1.0-0.1-0.2-0.2-0.2-0.4-0.6-0.6-0.6-0.5-0.30.00.40.30.50.80.50.3-0.0-0.00.60.50.70.40.40.20.30.70.50.40.1

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:ConsolidatedEntities

srt:ParentCompany


Accumulated
Period End2020-12-312019-12-312018-12-31
Value150-296.0-986.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0
Percentage of Assets0.2-0.4-1.4
Percentage of Assets srt:ParentCompany0.3-0.6-2.0

Minority Interest

us-gaap:MinorityInterest

us-gaap:MinorityInterest


Minority
Period End2021-06-302021-03-31
Value7865
Percentage of MinorityInterest100.0100.0
Percentage of Assets0.10.1

us-gaap:MinorityInterest us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Minority
Period End2021-06-302021-03-31
Value7865
Percentage of MinorityInterest100.0100.0
Percentage of Assets0.10.1
Percentage of Assets us-gaap:NoncontrollingInterest0.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value168325053813-1150.05510251513271667143716304636065422214-1301.22404393268827496366213049493431173165030560510711387272139742595675924052112235714297711114587896256-322.9
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues5.07.712.0-3.718.88.54.86.25.66.62.02.62.49.8-5.710.71.811.91.34.53.16.44.71.75.98.71.63.35.87.81.57.82.45.44.91.63.47.90.49.35.17.54.06.11.8-2.1

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-4925.0-2307.030589-4934.0-2784.0723-1698.0-1165.0-652.0773-687.8-778.3-565.9-3620.7807-1041.8-1227.0670523-316.8-1391.0630244684-2711.6660-107.7-783.0-744.3-147.6-23.4-867.8-1195.6-1266.5-1317.9-1987.320381-853.0-752.3282-102.6-849.0-511.8191
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-14.5-7.11.00.3-16.9-9.42.6-6.4-4.6-2.63.3-3.0-3.4-2.5-16.03.6-4.6-5.43.12.4-1.5-6.93.11.23.4-14.23.5-0.6-4.2-4.2-0.8-0.1-4.9-6.8-8.2-8.6-12.90.12.5-5.5-5.01.9-0.7-5.8-3.51.3

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-820.03388-2367.0-984.0105679-1304.0144-677.0-429.0-1561.0-340.6288-627.72433-1676.8-1563.81234581-524.1-437.1-353.2-1012.4-593.9-1703.0311-528.9-560.9-474.1-258.6-725.8-536.8123-579.154715661141-1167.0-744.0234-723.5-785.8-939.8167-1239.3-1157.7
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-2.410.5-7.4-3.20.42.3-4.80.5-2.7-1.7-6.7-1.51.3-2.810.7-7.5-7.05.52.7-2.4-2.0-1.7-5.0-3.0-8.51.6-2.8-3.0-2.6-1.4-4.1-3.00.7-3.33.510.27.4-7.6-4.91.5-4.8-5.3-6.41.1-8.6-7.7

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

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-4068.035851757-2044.0683408747112-404.0548
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-12.011.15.5-6.62.31.42.70.4-1.62.2

Deferred Income Tax Expense Benefit

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DeferredIncomeTaxExpenseBenefit


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-39.031-438.0-162.03.057110-108.02455-50.013953-51.5-1034.6-27.6-52.7-157.245-18.12673-53.1-60.3-23.170-77.459-36.58571-26.45.39.1-127.81672759-77.0406644-9.2432740
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value194109171-15.0-137.0-13.016164515455450541128.7-2.8464231210.7-13.2129.0-3.212182924-23.134171037-14.27.910.0-10.84.010.0114.65.82112
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value168325053813-1150.05510251513271667143716304636065422214-1301.22404393268827496366213049493431173165030560510711387272139742595675924052112235714297711114587896256-322.9
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues5.07.712.0-3.718.88.54.86.25.66.62.02.62.49.8-5.710.71.811.91.34.53.16.44.71.75.98.71.63.35.87.81.57.82.45.44.91.63.47.90.49.35.17.54.06.11.8-2.1

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value179316655512222276152393411831139155142496010531312123074685510093686177807031806548598655066307317011486568008854646916438563356837019265487397228762741730693580
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues5.35.11.70.77.85.13.44.44.56.31.84.14.65.85.43.33.84.51.72.93.63.50.93.34.34.52.73.44.03.90.83.74.55.03.04.54.25.62.24.44.66.23.75.15.05.814.44.74.53.8

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value17931665222227615231183113915514259601054131212307468551009368617780703180654859865506630731701148656800885464691643856335683701926548739722876
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.2100.0100.1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues5.35.10.77.85.14.44.56.31.84.14.65.85.43.33.84.51.72.93.63.50.93.34.34.52.73.44.03.90.83.74.55.03.04.54.25.62.24.44.66.23.75.15.05.8
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-06-302020-03-31
Value1801166722761523
Percentage of ProfitLoss100.0100.0100.0100.0
Percentage of Revenues5.35.17.85.1

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value69646980676768867070915635423843444240414437374241274336503842404121225239323637382239394314
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-4925.0-2307.030589-4934.0-2784.0723-1698.0-1165.0-652.0773-687.8-778.3-565.9-3620.7807-1041.8-1227.0670523-316.8-1391.0630244684-2711.6660-107.7-783.0-744.3-147.6-23.4-867.8-1195.6-1266.5-1317.9-1987.320381-853.0-752.3282-102.6-849.0-511.8191
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-14.5-7.11.00.3-16.9-9.42.6-6.4-4.6-2.63.3-3.0-3.4-2.5-16.03.6-4.6-5.43.12.4-1.5-6.93.11.23.4-14.23.5-0.6-4.2-4.2-0.8-0.1-4.9-6.8-8.2-8.6-12.90.12.5-5.5-5.01.9-0.7-5.8-3.51.3

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value28520427830623320435127122123432035531421828321816912716816413311722917814088304139135135238158142107169149102123185127104101117110102120
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments To Acquire Investments

us-gaap:PaymentsToAcquireInvestments

us-gaap:PaymentsToAcquireInvestments


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value4243697827845573723938965644619750446069
Percentage of PaymentsToAcquireInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-820.03388-2367.0-984.0105679-1304.0144-677.0-429.0-1561.0-340.6288-627.72433-1676.8-1563.81234581-524.1-437.1-353.2-1012.4-593.9-1703.0311-528.9-560.9-474.1-258.6-725.8-536.8123-579.154715661141-1167.0-744.0234-723.5-785.8-939.8167-1239.3-1157.7
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-2.410.5-7.4-3.20.42.3-4.80.5-2.7-1.7-6.7-1.51.3-2.810.7-7.5-7.05.52.7-2.4-2.0-1.7-5.0-3.0-8.51.6-2.8-3.0-2.6-1.4-4.1-3.00.7-3.33.510.27.4-7.6-4.91.5-4.8-5.3-6.41.1-8.6-7.7

Proceeds From Issuance Of Long Term Debt

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:ProceedsFromIssuanceOfLongTermDebt


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302014-12-312014-09-302013-12-312012-12-312012-09-302011-12-312011-09-302010-12-31
Value0.03462-1.01.021843000.02473-2.02.00.00.1-1.183654570.00.00.00.00.00.0-2.20.027000.0153332120.010970.0
Percentage of ProceedsFromIssuanceOfLongTermDebt0.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.00.00.00.00.00.00.0100.00.0100.00.0100.0100.00.0100.00.0

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt


Repayments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value9688091035220085010.0632917300.366218850.05284010.00.00.00.0310456191316-0.7168520240.012450.05560.18001003501.31.11.97001.74085615
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RepaymentsOfLongTermDebt us-gaap:DebtInstrument

us-gaap:ConvertibleDebt


Repayments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312015-12-312015-09-302015-06-30
Value670.0103522000.010.063284800.3373800-98.7-1646.3
Percentage of RepaymentsOfLongTermDebt6.90.0100.0100.0100.00.0100.0100.097.611.0100.05.71223.3-21.6-86.0

Payments Of Dividends

us-gaap:PaymentsOfDividends

us-gaap:PaymentsOfDividends


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-10-222013-12-312013-07-232013-09-302013-05-152013-06-302013-02-202013-03-312012-11-062012-12-312012-07-242012-09-302012-05-162012-06-302012-01-242012-03-312011-12-312011-07-262011-09-302011-05-172011-06-302011-02-222011-03-31
Value278277234238242240202204206206193195196191179181171172171171170170163163163166117119120123110110111111112112113113878790909393959585888891919292
Percentage of PaymentsOfDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-10-102013-09-302013-07-112013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value4804471358758555293056444582944933974003943621126458500.00.00.00.00.010563677434357881412624497255460275340668655493679685897714741101546314931388
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Debt Instrument Interest Rate Stated Percentage

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument

us-gaap:DebtInstrumentInterestRateStatedPercentage

antm:OnePointFiveZeroPercentDueTwoThousandTwentySix


Debt
Period End2021-03-17
Value1.5
Percentage of DebtInstrumentInterestRateStatedPercentage100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations antm:OnePointFiveZeroPercentDueTwoThousandTwentySix0.0

antm:PointFourFiveZeroPercentDueTwoThousandTwentyThree


Debt
Period End2021-03-17
Value0.45
Percentage of DebtInstrumentInterestRateStatedPercentage30.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations antm:PointFourFiveZeroPercentDueTwoThousandTwentyThree0.0

antm:ThreePointSevenZeroZeroPercentDueTwoThousandTwentyOne


Debt
Period End2021-05-15
Value3.7
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations antm:ThreePointSevenZeroZeroPercentDueTwoThousandTwentyOne0.0

antm:ThreePointSixZeroPercentDueTwoThousandFiftyOne


Debt
Period End2021-03-17
Value3.6
Percentage of DebtInstrumentInterestRateStatedPercentage240.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations antm:ThreePointSixZeroPercentDueTwoThousandFiftyOne0.0

antm:TwoPointFiveFiveZeroPercentDueTwoThousandThirtyOne


Debt
Period End2021-03-17
Value2.55
Percentage of DebtInstrumentInterestRateStatedPercentage170.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations antm:TwoPointFiveFiveZeroPercentDueTwoThousandThirtyOne0.0

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument, us-gaap:SubsequentEventType

antm:ThreePointSevenZeroZeroPercentDueTwoThousandTwentyOne, us-gaap:SubsequentEvent


Debt
Period End2021-05-15
Value3.7
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations antm:ThreePointSevenZeroZeroPercentDueTwoThousandTwentyOne us-gaap:SubsequentEvent0.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312010-09-30
Value23.523.4-1.842.90.2770.271-0.010.2060.2160.203-0.0050.2270.2990.263-0.2890.3320.2910.333-0.0030.4560.4610.4640.0060.420.4490.4490.0040.420.4210.3880.0070.2570.3390.312-0.0390.3260.3860.346-0.0050.3460.304-0.0140.35
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value3.13.43.13.43.53.83.13.43.73.93.74.04.34.64.34.75.05.55.65.96.26.56.06.26.36.97.37.78.89.610.012151817181820202021242426
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value253.91251.8230.0223.68221.84216.4190.31185.47182.4181.02149.65148.58147.09145.62124.31122.55121.72119.24102.8101.68101.2100.8487.2386.685.8384.3170.370.1569.9569.4665.3865.8566.1164.8364.6763.5863.5663.5862.361.7661.4760.8759.656.98
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-31
Value0900000.000100000.01200000.000500000.00100000.0800000.0-300000.0200000.0100000.0500000.0001000000.000900000.00100000.01300000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod0.0100.00.00.0100.0100.00.00.0100.00.0100.0100.0100.0100.0100.0100.00.00.0100.00.00.0100.00.0100.0100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2020-12-312019-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value20192227419742394640386536963671
Percentage of DeferredTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value166111331343125212961502156515701724
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value24914624118913121211510314393100116159
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value84450.02.62418111111
Percentage of DeferredTaxAssetsValuationAllowance100.0100.00.0100.0100.0100.0100.0100.0100.0

antm:AOCICashFlowHedgeUnrealizedGainLossBeforeTax

antm:AOCICashFlowHedgeUnrealizedGainLossBeforeTax


A
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value3000000.0-311000000.03000000.04000000.04000000.0-327000000.09000000.0-32000000.00-308000000.0
Percentage of AOCICashFlowHedgeUnrealizedGainLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

antm:Changeinnoncreditcomponentofimpairmentlossesoninvestmentsnetoftax

antm:Changeinnoncreditcomponentofimpairmentlossesoninvestmentsnetoftax


Changeinnoncreditcomponentofimpairmentlossesoninvestmentsnetoftax
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value1.01.01610.0-32.0-1.0-1.0
Percentage of Changeinnoncreditcomponentofimpairmentlossesoninvestmentsnetoftax100.0100.0100.0100.0100.0100.0100.0

antm:EquitySecuritiesRealizedGainsLossesonSales us-gaap:InvestmentType

antm:EquitySecuritiesRealizedGainsLossesonSales

us-gaap:EquitySecurities


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1.02681-15.013-18.094-6.0-29.0-21.0151-11.0
Percentage of EquitySecuritiesRealizedGainsLossesonSales100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:GrossRealizedGainsFromSaleofOtherInvestments us-gaap:InvestmentType

antm:GrossRealizedGainsFromSaleofOtherInvestments

us-gaap:OtherInvestments


Gross
Period End2021-06-302021-03-312020-06-302020-03-31
Value905.0-1.07.0
Percentage of GrossRealizedGainsFromSaleofOtherInvestments100.0100.0100.0100.0

antm:Impairmentlossesreversalsoninvestments

antm:Impairmentlossesreversalsoninvestments


Impairmentlossesreversalsoninvestments
Period End2020-09-302020-06-302019-09-302019-06-30
Value24-6.0149.0
Percentage of Impairmentlossesreversalsoninvestments100.0100.0100.0100.0

antm:Impairmentlossesreversalsoninvestments us-gaap:InvestmentType

us-gaap:FixedMaturities


Impairmentlossesreversalsoninvestmentsus-gaap:
Period End2021-06-302021-03-312020-06-302020-03-31
Value-2.01.0-27.051
Percentage of Impairmentlossesreversalsoninvestments0.00.0450.00.0

us-gaap:OtherInvestments


Impairmentlossesreversalsoninvestmentsus-gaap:
Period End2021-06-302021-03-312020-06-302020-03-31
Value-2.08.0296.0
Percentage of Impairmentlossesreversalsoninvestments0.00.0-483.30.0

antm:Impairmentlossesreversalsrecognizedinearnings

antm:Impairmentlossesreversalsrecognizedinearnings


Impairmentlossesreversalsrecognizedinearnings
Period End2020-09-302020-06-302019-09-302019-06-30
Value18-11.0137.0
Percentage of Impairmentlossesreversalsrecognizedinearnings100.0100.0100.0100.0

antm:Netrealizedlossesgainsonfinancialinstruments

antm:Netrealizedlossesgainsonfinancialinstruments


Netrealizedlossesgainsonfinancialinstruments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value172-4.024718-24.0241.01178-185.0274.0-26.0
Percentage of Netrealizedlossesgainsonfinancialinstruments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:Netrealizedlossesgainsonfinancialinstruments us-gaap:InvestmentType

us-gaap:EquitySecurities


Netrealizedlossesgainsonfinancialinstrumentsus-gaap:
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value18-66.018845-50.0-12.0-16.01379-166.027
Percentage of Netrealizedlossesgainsonfinancialinstruments10.51650.076.1250.0208.3-50.0-1600.0118.2101.389.7100.0

antm:Noncreditcomponentofimpairmentlossesoninvestmentsrecognizedinothercomprehensiveincomebeforetax

antm:Noncreditcomponentofimpairmentlossesoninvestmentsrecognizedinothercomprehensiveincomebeforetax


Noncreditcomponentofimpairmentlossesoninvestmentsrecognizedinothercomprehensiveincomebeforetax
Period End2020-09-302020-06-302019-09-302019-06-30
Value-6000000.0-5000000.0-1000000.0-2000000.0
Percentage of Noncreditcomponentofimpairmentlossesoninvestmentsrecognizedinothercomprehensiveincomebeforetax100.0100.0100.0100.0

antm:OperatingRevenue

antm:OperatingRevenue


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value33279320983153330649291782944827132264442517724388233042298022715
Percentage of OperatingRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:OtherNetChangeInUnrecognizedPeriodicBenefitCostsForDefinedBenefitPensionAndPostretirementBenefitPlansTaxBenefitExpense

antm:OtherNetChangeInUnrecognizedPeriodicBenefitCostsForDefinedBenefitPensionAndPostretirementBenefitPlansTaxBenefitExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-2.0-4.011-2.0-4.0-3.012-1.0-1.0-1.0-22.0-2.0-2.7-2.643-3.0-2.9-2.31.3-1.7-2.6-2.4-23.43.73.33.0-81.42.02.31.9
Percentage of OtherNetChangeInUnrecognizedPeriodicBenefitCostsForDefinedBenefitPensionAndPostretirementBenefitPlansTaxBenefitExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:PotentiallyDilutiveRestrictedStockUnitsContingentOnOperatingResults

antm:PotentiallyDilutiveRestrictedStockUnitsContingentOnOperatingResults


Potentially
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value0300000.00100000.00200000.0000200000.0000300000.00300000.00100000.0000500000.000-100000.0500000.0000700000.0
Percentage of PotentiallyDilutiveRestrictedStockUnitsContingentOnOperatingResults0.0100.00.0100.00.0100.00.00.00.0100.00.00.00.0100.00.0100.00.0100.00.00.00.0100.00.00.0100.0100.00.00.00.0100.0

antm:Proceedsfromsaleofequityandfixedmaturitysecurities

antm:Proceedsfromsaleofequityandfixedmaturitysecurities


Proceedsfromsaleofequityandfixedmaturitysecurities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1695465025794015199627285766399735995236
Percentage of Proceedsfromsaleofequityandfixedmaturitysecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:ProductRevenue

antm:ProductRevenue


Product
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value304227372899259825432344150011161440.0
Percentage of ProductRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

antm:RepurchasedFaceAmount us-gaap:DebtInstrument

antm:RepurchasedFaceAmount

antm:Otherseniorunsecurednotes


Repurchased
Period End2020-09-302015-12-31
Value790.0
Percentage of RepurchasedFaceAmount100.00.0

us-gaap:ConvertibleDebt


Repurchased
Period End2020-12-312020-09-302020-06-302015-12-312015-09-30
Value160.02716950
Percentage of RepurchasedFaceAmount0.00.00.00.00.0

antm:SecuritiesLendingTransactionsInitialCollateralPercentageValue

antm:SecuritiesLendingTransactionsInitialCollateralPercentageValue


Securities
Period End2021-06-302021-03-312020-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0102.01.02001.020001.020001.02
Percentage of SecuritiesLendingTransactionsInitialCollateralPercentageValue0.0100.0100.00.00.0100.00.00.00.0100.00.00.00.0100.0

antm:StockRepurchasedAndRetiredDuringPeriodAveragePrice

antm:StockRepurchasedAndRetiredDuringPeriodAveragePrice


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value30.41316.0617.2-4.57-1.66275.38-1.77-3.42-1.39275.238.198.54-1.9233.513.136.4319.56160.810-0.138.75136.882.324.13.9688.14
Percentage of StockRepurchasedAndRetiredDuringPeriodAveragePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0

antm:Taxexpensebenefitofnoncreditimpairmentonavailableforsalesecuritiesrecognizedinothercomprehensiveincomeloss

antm:Taxexpensebenefitofnoncreditimpairmentonavailableforsalesecuritiesrecognizedinothercomprehensiveincomeloss


Taxexpensebenefitofnoncreditimpairmentonavailableforsalesecuritiesrecognizedinothercomprehensiveincomeloss
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-06-30
Value0-1000000.0-5000000.0-2000000.09000000.00
Percentage of Taxexpensebenefitofnoncreditimpairmentonavailableforsalesecuritiesrecognizedinothercomprehensiveincomeloss0.0100.0100.0100.0100.00.0

antm:UnrealizedGainsandLossesRecognizedonEquitySecurities us-gaap:InvestmentType

antm:UnrealizedGainsandLossesRecognizedonEquitySecurities

us-gaap:EquitySecurities


Unrealized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value17-40.0-30.017358-68.04.0-22.0-16.0589916
Percentage of UnrealizedGainsandLossesRecognizedonEquitySecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebtSubsequentAdjustments

us-gaap:AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebtSubsequentAdjustments


Adjustments
Period End2021-06-302020-06-302020-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-30
Value-216000000.0-82000000.0-42000000.0-9000000.0-52000000.0-242000000.0-65000000.0-200000.0-30300000.0-243900000.000-1100000.0-192700000.0-51500000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebtSubsequentAdjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebtSubsequentAdjustments us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302020-06-302020-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-30
Value-216000000.0-82000000.0-42000000.0-9000000.0-52000000.0-242000000.0-65000000.0-200000.0-30300000.0-243900000.000-1100000.0-192700000.0-51500000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebtSubsequentAdjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesGrossRealizedGainLossNet us-gaap:InvestmentType

us-gaap:AvailableForSaleSecuritiesGrossRealizedGainLossNet

us-gaap:EquitySecurities


Available
Period End2021-06-302021-03-312020-06-302020-03-31
Value18-66.045-50.0
Percentage of AvailableForSaleSecuritiesGrossRealizedGainLossNet100.0100.0100.0100.0

us-gaap:FixedMaturities


Available
Period End2021-06-302021-03-312020-06-302020-03-31
Value374314-28.0
Percentage of AvailableForSaleSecuritiesGrossRealizedGainLossNet205.6-65.231.156.0

us-gaap:AvailableForSaleSecuritiesGrossRealizedGains

us-gaap:AvailableForSaleSecuritiesGrossRealizedGains


Available
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value51374326221812302921144505979113108121177491481339632106821581607110711910998
Percentage of AvailableForSaleSecuritiesGrossRealizedGains100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesGrossRealizedGains us-gaap:InvestmentType

us-gaap:EquitySecurities


Available
Period End2021-06-302021-03-312020-06-302020-03-312017-12-312017-09-302017-06-302017-03-31
Value2312642320969.414
Percentage of AvailableForSaleSecuritiesGrossRealizedGains0.00.0173.053.591.866.518.523.7

us-gaap:FixedMaturities


Available
Period End2021-06-302021-03-312020-06-302020-03-31
Value47563743
Percentage of AvailableForSaleSecuritiesGrossRealizedGains0.00.0100.0100.0

us-gaap:AvailableForSaleSecuritiesGrossRealizedLosses

us-gaap:AvailableForSaleSecuritiesGrossRealizedLosses


Available
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value1450209.017171632369.217203065133192556-61.4-56.1-87.2229-6.7-40.4415365-17.7901654-28.4
Percentage of AvailableForSaleSecuritiesGrossRealizedLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesGrossRealizedLosses us-gaap:InvestmentType

us-gaap:EquitySecurities


Available
Period End2021-06-302021-03-312020-06-302020-03-312017-12-312017-09-302017-06-302017-03-31
Value5.07819733.98.03.02.0
Percentage of AvailableForSaleSecuritiesGrossRealizedLosses0.00.038.0365.042.446.514.96.6

us-gaap:FixedMaturities


Available
Period End2021-06-302021-03-312020-06-302020-03-31
Value12125020
Percentage of AvailableForSaleSecuritiesGrossRealizedLosses0.00.0100.0100.0

us-gaap:DebtInstrumentConvertibleConversionRatio1 us-gaap:DebtInstrument

us-gaap:DebtInstrumentConvertibleConversionRatio1

us-gaap:ConvertibleDebt


Debt
Period End2021-06-302021-03-31
Value0.030414.116
Percentage of DebtInstrumentConvertibleConversionRatio1100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded


Debt
Period End2021-06-302021-03-312020-09-302020-06-302020-03-31
Value0.01.01.010.051
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded0.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302021-03-312020-09-302020-06-302020-03-31
Value0.01.01.09.051
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded0.0100.0100.090.0100.0

us-gaap:ForeignGovernmentDebt


Debt
Period End2020-09-302020-06-30
Value0.01.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded0.010.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease


Debt
Period End2020-09-302020-06-30
Value-8000000.0-29000000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302021-03-312020-09-302020-06-30
Value0-2000000.0-8000000.0-29000000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease0.00.0100.0100.0

us-gaap:ResidentialMortgageBackedSecurities


Debt
Period End2021-06-302021-03-31
Value02000000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease0.00.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold


Debt
Period End2021-06-302020-09-302020-06-30
Value-2000000.0-5000000.0-8000000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302020-09-302020-06-30
Value-2000000.0-5000000.0-8000000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold100.0100.0100.0

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-6000000.0-6000000.0-6000000.0-6000000.0-4000000.0-5000000.0-4000000.0-4000000.0-4000000.0-6000000.0-6000000.0-6000000.0-5500000.0-5400000.0-5500000.0-5400000.0-5800000.0-4500000.0-4300000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-1000000.0-2000000.0-2000000.0-2000000.0-3000000.0-3000000.0-3000000.0-3000000.0-3000000.0-3000000.0-3100000.0-3100000.0-3400000.0-3400000.0-3400000.0-3400000.0-3500000.0-3400000.0-3400000.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanContributionsByEmployer

us-gaap:DefinedBenefitPlanContributionsByEmployer


Defined
Period End2020-09-302019-09-302017-09-302016-09-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value0.00.00.20.30.0300.00.01.20.00.0
Percentage of DefinedBenefitPlanContributionsByEmployer0.00.0100.0100.00.0100.00.00.0100.00.00.0

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value7.06.06.06.05.06.06.05.06.06.06.06.15.65.75.65.75.65.65.6
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value34352940343535343737363636363736373636
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets485.7583.3483.3666.7680.0583.3583.3680.0616.7616.7611.7603.3658.9647.4660.7645.6660.7655.4655.4

us-gaap:DefinedBenefitPlanInterestCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanInterestCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value2.03.02.03.04.03.04.04.04.04.03.83.85.25.25.25.25.65.65.6
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value10.0121312151516161414131316161616161717
Percentage of DefinedBenefitPlanInterestCost500.0400.0650.0400.0375.0500.0400.0400.0350.0350.0355.3357.9315.4319.2321.2319.2296.4308.9308.9

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-5.0-5.0-6.0-5.0-4.0-4.0-4.0-4.0-5.0-4.0-4.2-4.2-0.6-0.7-0.6-0.70.10.00.1
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-10.0-11.00.0-17.0-14.0-11.0-13.0-12.0-31.0-9.0-8.5-8.5-11.9-9.5-10.3-10.7-11.2-11.1-9.1
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost200.0220.0-0.0340.0350.0275.0325.0300.0620.0225.0202.4202.41983.31357.11716.71528.6-11200.00.0-9100.0

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-8000000.0-6000000.0-10000000.0-5000000.0-1000000.0-4000000.0-2000000.0-2000000.014000000.0-6000000.0-6600000.0-6600000.0-700000.0-2900000.0-2100000.0-1700000.0-600000.0-1100000.0-3200000.0
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepreciationAmortizationAndAccretionNet

us-gaap:DepreciationAmortizationAndAccretionNet


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value309282290308286270246301297289
Percentage of DepreciationAmortizationAndAccretionNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeGainLossOnDerivativeNet

us-gaap:DerivativeGainLossOnDerivativeNet


Derivative
Period End2021-06-302021-03-312020-06-302020-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2522-1.0-3.01.02.019-0.1-10.9-12.5-14.6-10.315-3.9-64.9-153.83.37.022-22.0
Percentage of DerivativeGainLossOnDerivativeNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStock

us-gaap:DividendsCommonStock


Dividends
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value279281238244243204208206195195197199180182172172171172172171164164165167118120121124111112113114-654.391949686899293
Percentage of DividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStock us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value279281238244243204208206195195197199180182172172171172172171164164165167118120121124111112113114-654.391949686899293
Percentage of DividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents

us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents


Effect
Period End2021-06-302021-03-312020-12-312020-03-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-6000000.0-1000000.06000000.0-2000000.01000000.0-1000000.0-1000000.0-600000.0-800000.0400000.0400000.01000000.01300000.01600000.02200000.0900000.0-1400000.02400000.0-1700000.0800000.01100000.0-5500000.0-2500000.0-3800000.0-500000.0-300000.01800000.01200000.0700000.0-1500000.01400000.0400000.0-2000000.01300000.0-1900000.0-2300000.01800000.02000000.0-2000000.03300000.0-3300000.0-1200000.0
Percentage of EffectOfExchangeRateOnCashAndCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ExtinguishmentOfDebtAmount us-gaap:DebtInstrument

us-gaap:ExtinguishmentOfDebtAmount

antm:Otherseniorunsecurednotes


Extinguishment
Period End2020-09-30
Value109
Percentage of ExtinguishmentOfDebtAmount100.0

us-gaap:ConvertibleDebt


Extinguishment
Period End2021-06-30
Value46
Percentage of ExtinguishmentOfDebtAmount0.0

us-gaap:FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss

us-gaap:FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value5.08.01.0-3.0-10.0-7.010.0-4.02.0-2.03.09.07.4-0.5-0.1-0.6-0.9-1.7-0.1-0.1-0.1-1.7-0.40.0-0.2-1.40.0-3.5-4.0-4.3-17.8-15.0-3.2-1.4
Percentage of FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss us-gaap:FinancialInstrument

us-gaap:EquitySecurities


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value5.08.01.0-3.0-10.0-7.010.0-4.02.0-2.03.09.07.0
Percentage of FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.094.6

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value5.08.0-1.0-4.0-9.0-8.0-1.0-8.0-1.0-3.0-1.04.08.1-239.00.1-0.50.4-1.0-2.3-0.5-0.71.31.80.3-1.2-0.82.7-33.07.218-18.1-15.0-3.00.9-0.5-0.40.414
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities


Fair
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-1.0-1.01.0-2.00.0-3.0-3.0-1.00.00.01.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1100.025.0-11.125.0-0.037.5300.033.3-0.00.012.3

us-gaap:EquitySecurities


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value5.08.00.0-3.0-10.0-6.0-1.0-5.02.0-2.0-1.04.07.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1100.0100.0-0.075.0111.175.0100.062.5-200.066.7100.0100.086.4

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value3.03.0-2.014-7.0-10.0-11.0120.02.0-2.0-1.0-2.80.45.54.80.63.3-0.4-0.61.5-3.5-3.03.71.02.7-2.3-0.316-2.5-0.42.65.7-1.3-5.3-2.8-4.8-20.2
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value3.03.0-2.014-7.0-10.0-11.0120.02.0-2.0-1.0-3.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0107.1

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value7539407.0173850534442614053275194768811636962102882065393323191814103610.01919311818121216
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value6539415.0142631283033263242
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases86.7100.0102.571.482.468.462.052.868.278.642.680.078.7

us-gaap:EquitySecurities


Fair
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value8.0-1.02.03.0121925147.0275.03.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases10.7-2.528.617.631.638.047.231.816.744.312.55.6

us-gaap:OtherDebtSecurities


Fair
Period End2021-06-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2.00.00.00.00.00.02.06.03.09.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases2.70.00.00.00.00.04.89.87.516.9

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value10.05.010.05.0141242289.022485.0114.55.43.31234118118.93.41.5155.35.42322132.87.81.60.0-2.5-13.6-21.2-10.2-1.9-14.1-14.7-12.3-27.1
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value9.02.010.05.01.03.0119.01.01.0162.011
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales90.040.0100.0100.07.125.026.232.111.14.533.340.094.8

us-gaap:EquitySecurities


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1.03.00.00.0139.031198.021313.01.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales10.060.00.00.092.975.073.867.988.995.564.660.08.6

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value324111149.013181821223730247.117181620306.61010242.8111325-3.2-1.65.76.85.2-1.3-10.9-3.7-6.0-7.4-52.2-4.8-6.1-122.0-17.5
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value324111149.01113181921283023
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements100.0100.0100.0100.0100.084.672.2100.090.595.575.7100.095.8

us-gaap:OtherDebtSecurities


Fair
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.00.00.02.04.00.01.01.09.00.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements0.00.00.015.422.20.04.84.524.30.00.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3


Fair
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value-3.00.00.013-2.04.00.03.04.07.04120124.16.39.59.2139.811130.04.20.70.00.6240.00.0250.0131.210.0181.40.017470.0610.04.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3100.00.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.00.00.0100.00.0100.0100.0100.0100.0100.00.0100.0100.00.0100.00.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3 us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities


Fair
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-3.00.00.013-4.04.00.00.00.06.038
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3100.00.00.0100.0200.0100.00.00.00.085.790.9

us-gaap:GainLossOnSaleOfOtherInvestments us-gaap:InvestmentType

us-gaap:GainLossOnSaleOfOtherInvestments

us-gaap:OtherInvestments


Gain
Period End2021-06-302021-03-312020-06-30
Value92-3.0-29.0
Percentage of GainLossOnSaleOfOtherInvestments100.0100.0100.0

us-gaap:GoodwillPurchaseAccountingAdjustments us-gaap:BusinessAcquisition, us-gaap:StatementBusinessSegments

us-gaap:GoodwillPurchaseAccountingAdjustments

antm:BeaconHealthOptions, antm:OtherSegment


Goodwill
Period End2021-06-302021-03-31
Value0.09.0
Percentage of GoodwillPurchaseAccountingAdjustments0.0100.0

us-gaap:IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities

us-gaap:IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value20235825851280588-189.0127-29.0-354.0
Percentage of IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInCollateralHeldUnderSecuritiesLending

us-gaap:IncreaseDecreaseInCollateralHeldUnderSecuritiesLending


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-89.0731181-96.068777-115.0-99.0-26.0-14.0-137.011612157-452.0-307.3-19.7154-280.4-152.856154-217.7-199.6-305.1508-183.0-248.36223541321679312-136.4-65.450-156.699-38.521-111.66.5160
Percentage of IncreaseDecreaseInCollateralHeldUnderSecuritiesLending100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDeferredRevenue

us-gaap:IncreaseDecreaseInDeferredRevenue


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-61.0-119.029715-1.0-109.06948-98.096
Percentage of IncreaseDecreaseInDeferredRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable

us-gaap:IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value-332.0438-32.0-1209.0822491-244.0205-401.01155085-349.4536-550.174-378.0659-231.872-169.5507-321.6
Percentage of IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInInsuranceLiabilities

us-gaap:IncreaseDecreaseInInsuranceLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value45714551904600332692432143460791-503.053-49.1-560.845720123130571-303.681-27.2220-306.2-104.1382110277307545-215.58.4-209.670-36.985-22.9-79.033012121730991-364.5-125.968
Percentage of IncreaseDecreaseInInsuranceLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInOtherOperatingAssets


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-41.0288-705.0502-39.0525-110.022133125-708.028853391112194117205-797.5640167117-650.6227197191-714.7206336985-23.9-86.358-112.5-44.03.074152-30.5-22.7160230-4.21974
Percentage of IncreaseDecreaseInOtherOperatingAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInReceivables

us-gaap:IncreaseDecreaseInReceivables


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3741258-589.0532-326.0639173291-164.0753-128.0252606-36.7633-746.3411-276.31204-156.6162170496-772.5-111.142987918122361650-251.7222397-323.1-333.716430244298-209.6268-132.5-282.525279
Percentage of IncreaseDecreaseInReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInSecuritiesLendingPayable

us-gaap:IncreaseDecreaseInSecuritiesLendingPayable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-89.0731181-96.068777-115.0-99.0-26.0-14.0-137.011712157-452.0-307.3-19.7154-280.4-152.756154-217.7-199.6-305.2508-182.9-248.56223541321679312-136.3-65.450-156.699-38.722-111.76.6160
Percentage of IncreaseDecreaseInSecuritiesLendingPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInTradingSecurities

us-gaap:IncreaseDecreaseInTradingSecurities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2420381839-63.0182.07.021-16.06.04.26.89.33.87.6141.74.57.95.35.8-15.7-6.1104.1-6.09.01416-10.70.88.21212-6.9210.3-10.37.011140.0-1.9-7.0
Percentage of IncreaseDecreaseInTradingSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0

us-gaap:InsuranceServicesRevenue

us-gaap:InsuranceServicesRevenue


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value33279320983153330649291782944827132264442517724388233042298022714223422244722096221982231921484211252127420309200231977119758188511877618370182301764417314177331759717546152711513315173151501517515155148791465414493143081419814843
Percentage of InsuranceServicesRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InsuranceServicesRevenue us-gaap:ConsolidatedEntities

us-gaap:IntersegmentElimination


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-5073.0-4908.0-4096.0-4158.0-3574.0-3603.0-2254.0-1303.0-572.0-477.0-347.0-330.0-309.0
Percentage of InsuranceServicesRevenue-15.2-15.3-13.0-13.6-12.2-12.2-8.3-4.9-2.3-2.0-1.5-1.4-1.4

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

antm:IngenioRxSegment, antm:Affiliated


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value317731242964298427252853210511481030.0
Percentage of InsuranceServicesRevenue9.59.79.49.79.39.77.84.30.40.0

antm:OtherSegment, antm:Affiliated


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value189617841132117484975022541303572477347330309
Percentage of InsuranceServicesRevenue5.75.63.63.82.92.58.34.92.32.01.51.41.4

us-gaap:InsuranceServicesRevenue us-gaap:MajorCustomers

antm:Unaffiliated


Insurance
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value33279320983064929178294482644425177243882298022715
Percentage of InsuranceServicesRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

antm:Unaffiliated, antm:CommercialSpecialty


Insurance
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value9550949193268789936192849417939289339055
Percentage of InsuranceServicesRevenue28.729.630.430.131.835.137.438.538.939.9

antm:Unaffiliated, antm:GovernmentBusinessSegment


Insurance
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value20066192831810117242174661595515538149251397913619
Percentage of InsuranceServicesRevenue60.360.159.159.159.360.361.761.260.860.0

antm:Unaffiliated, antm:IngenioRxSegment


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value30422738289925982544234411277741450.0
Percentage of InsuranceServicesRevenue9.18.59.28.58.78.04.22.90.60.0

antm:Unaffiliated, antm:OtherSegment


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value6215866486246032771591120522271646841
Percentage of InsuranceServicesRevenue1.91.82.12.02.10.95.94.60.90.30.30.30.2

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

antm:DentalVisionProductsAndServices, antm:CommercialSpecialtyBusinessSegment


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value335336314318284315327325327323306306303304305305301306
Percentage of InsuranceServicesRevenue1.01.01.01.01.01.11.21.21.31.31.31.31.31.41.41.41.41.4

antm:IntegratedHealthServices, antm:OtherSegment


Insurance
Period End2021-06-302021-03-312020-06-302020-03-31
Value236622491376949
Percentage of InsuranceServicesRevenue7.17.04.73.2

antm:ManagedCareProducts, antm:CommercialSpecialtyBusinessSegment


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value777276897606752371327569750575427646761868017377744573638457847886648649
Percentage of InsuranceServicesRevenue23.424.024.124.524.425.727.728.530.431.229.232.132.833.037.738.439.038.8

antm:ManagedCareProducts, antm:GovernmentBusinessSegment


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value199651918218665179991714917375161181584715444148191461313695134311315212224119341176611918
Percentage of InsuranceServicesRevenue60.059.859.258.758.859.059.459.961.360.862.759.659.158.954.554.053.053.4

antm:ManagedCareServices, antm:CommercialSpecialtyBusinessSegment


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value141613861260139112631381140213301353136611971334130212821170119612321222
Percentage of InsuranceServicesRevenue4.34.34.04.54.34.75.25.05.45.65.15.85.75.75.25.45.65.5

antm:ManagedCareServices, antm:GovernmentBusinessSegment


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1011019810293919510894174307146112110105103117107
Percentage of InsuranceServicesRevenue0.30.30.30.30.30.30.40.40.40.71.30.60.50.50.50.50.50.5

antm:OtherProducts, antm:CommercialSpecialtyBusinessSegment


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value27804394110969487918512111111111517073110111
Percentage of InsuranceServicesRevenue0.10.20.10.30.40.30.30.30.40.30.50.50.50.50.80.30.50.5

antm:OtherProducts, antm:OtherSegment


Insurance
Period End2021-06-302021-03-312020-06-302020-03-31
Value1511217678
Percentage of InsuranceServicesRevenue0.50.40.30.3

antm:Pharmacyproductsandservices, antm:IngenioRxSegment


Insurance
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value6219586255825269519719222480.0
Percentage of InsuranceServicesRevenue18.718.318.218.117.67.31.00.0

us-gaap:InsuranceServicesRevenue us-gaap:StatementBusinessSegments

antm:CommercialSpecialtyBusinessSegment


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value9550949192239326878993619328928494179392842591289162906610103100521030810289
Percentage of InsuranceServicesRevenue28.729.629.230.430.131.834.435.137.438.536.239.740.340.645.045.546.446.1

antm:GovernmentBusinessSegment


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value200661928318763181011724217466162131595515538149931492013841135431326212330120371188312025
Percentage of InsuranceServicesRevenue60.360.159.559.159.159.359.860.361.761.564.060.259.659.454.954.553.553.9

antm:IngenioRxSegment


Insurance
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value6219586255825269519719222480.0
Percentage of InsuranceServicesRevenue18.718.318.218.117.67.31.00.0

antm:OtherSegment


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value251723701780179814521027384525087943.0-41.0118.213138.05.84.2
Percentage of InsuranceServicesRevenue7.67.45.65.95.03.514.29.53.20.0-0.20.00.00.10.10.00.00.0

antm:SegmentEliminations


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-5073.0-4908.0-4096.0-4158.0-3574.0-3603.0-2254.0-1303.0-572.0-477.0-347.0-330.0-309.0
Percentage of InsuranceServicesRevenue-15.2-15.3-13.0-13.6-12.2-12.2-8.3-4.9-2.3-2.0-1.5-1.4-1.4

us-gaap:LeaseCost

us-gaap:LeaseCost


Lease
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value454071282695769535353
Percentage of LeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value22502150312175021254178811374420543193841820412163172341736716667114781825117457167681177216824161341557010626
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1 us-gaap:StatementBusinessSegments

antm:CommercialSpecialtyBusinessSegment


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value6131416464176305510639086749634963883540611260255699379677577228693545607255664666354582
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear127.227.729.529.728.628.432.932.835.129.135.534.734.233.142.541.441.438.743.141.242.643.1

antm:GovernmentBusinessSegment


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value15997106501492214565124179698137941303511816862311122113421096876821049310229983372129569948889346044
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear171.170.968.668.569.470.667.167.264.970.964.565.365.866.957.558.658.661.356.958.857.456.9

antm:OtherSegment


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value3742174113843581380.00.0
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear11.71.41.91.82.01.00.00.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value101967482034489326109532847685414-83.0303731562768-138.87825288992949214619
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1 us-gaap:StatementBusinessSegments

antm:CommercialSpecialtyBusinessSegment


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value4081746101208343187564132315176641152318222162-239.13082062931293801622
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears140.025.949.846.436.830.7120.846.541.032.6-49.450.243.639.591.4172.339.539.094.243.941.335.1

antm:GovernmentBusinessSegment


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value59948561022405894234-11.01524533648-124.015141234055.910047332265.81655412996
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears158.872.050.253.663.269.3-20.853.559.067.4149.449.856.460.58.6-72.360.561.05.856.158.764.9

antm:OtherSegment


Liability
Period End2021-06-302021-03-312020-06-302020-03-312019-06-302019-03-31
Value121460.00.00.00.0
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears11.22.20.00.00.00.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value23844227272318021999187482053020475198971948418339169411778117303166251826817703175611717317202165921650015225
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 us-gaap:StatementBusinessSegments

antm:CommercialSpecialtyBusinessSegment


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value6718607269346641514757976928654667805498602461685957548878037441726467507365699068936081
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims128.226.729.930.227.528.233.832.934.830.035.634.734.433.042.742.041.439.342.842.141.839.9

antm:GovernmentBusinessSegment


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1672316319158361497813233146031354713351127041284110917116131134511137104641026210297104239836960296079144
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims170.171.868.368.170.671.166.267.165.270.064.465.365.667.057.358.058.660.757.257.958.260.1

antm:OtherSegment


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value4033364103803681300.00.0
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims11.71.51.81.72.00.60.00.0

us-gaap:LongTermPurchaseCommitmentAmount

us-gaap:LongTermPurchaseCommitmentAmount


Long
Period End2021-06-302021-03-312020-12-31
Value-57.0122349
Percentage of LongTermPurchaseCommitmentAmount100.0100.0100.0

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

us-gaap:LossContingencyDamagesSoughtValue

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


Loss
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value0.01580.00.00.01580.00.0
Percentage of LossContingencyDamagesSoughtValue0.0100.00.00.00.0100.00.00.0

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


Loss
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value0.0148000.00.00.0148000.00.0
Percentage of LossContingencyDamagesSoughtValue0.09367.10.00.00.09367.10.00.0

us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance

us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance


Noncontrolling
Period End2021-06-302021-03-31
Value3.065
Percentage of NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance100.0100.0

us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Noncontrolling
Period End2021-06-302021-03-31
Value3.065
Percentage of NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance100.0100.0

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeaseCost


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value342960272594760484545
Percentage of OperatingLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseImpairmentLoss

us-gaap:OperatingLeaseImpairmentLoss


Operating
Period End2020-12-312020-09-30
Value34224
Percentage of OperatingLeaseImpairmentLoss100.0100.0

us-gaap:OperatingLeasePayments

us-gaap:OperatingLeasePayments


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value36527047464444434444
Percentage of OperatingLeasePayments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent


Other
Period End2021-06-302021-03-312020-06-302020-03-31
Value175-360.0730-689.0
Percentage of OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value175-362.0246152741-716.0-10.0119237350-87.0-45.0-76.8-256.2-16.98711694-268.363243147-60.9-161.3-195.439-52.7-141.0108120-17.1-15.0-404.82978135-69.144
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesBeforeReclassificationAdjustmentsTax

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesBeforeReclassificationAdjustmentsTax


Other
Period End2021-06-302021-03-312020-06-302020-03-31
Value-61.0108-238.0213
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesBeforeReclassificationAdjustmentsTax100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value228-43.0-238.0213403-35.0-71.0-98.0-242.01221
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax


Other
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value1000000.0-1000000.0-1000000.00000001000000.00-100000.0-200000.0-100000.0-200000.0-400000.0-700000.0-600000.0-300000.0500000.0-700000.03100000.0200000.0400000.0-1900000.03600000.0-1300000.0-100000.00-1000000.0600000.0300000.0-500000.0400000.0300000.0-800000.0400000.0
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax100.0100.0100.00.00.00.00.00.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest

us-gaap:NoncontrollingInterest


Other
Period End2021-06-302021-03-31
Value2000000.0-2000000.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value178-345.0262142754-712.03.084240363-175.0-29.0-62.2-207.6248.926106961.017-89.8-76.4-216.6-237.566-161.2-141.914714418822-369.743-87.8174-22.8120
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value178-345.0142754-712.084240363-175.0-29.0-62.0-207.6248.926106961.017-89.8-76.4-216.6-237.566-161.2-141.914714418822-369.743-87.8174-22.8120
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.7100.098.4100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-8.0-10.026-8.0-10.0-7.0-16.0-4.0-3.0-3.0112-7.0-7.7-7.7-38.5-4.7-4.2-3.924-3.2-3.8-3.841-5.6-4.9-4.7127-3.0-3.0-2.9-154.1-4.87.06.830-6.96.36.7
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value2628223911-27.0213.0-1.0-7.0-22.0-9.0-4.8-11.50.37915141.25833-25.2-95.0-20.145-21.1-19.7-7.7-35.7-20.1-49.4-31.3-27.0-4.8
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-7.0-8.0-6.0-10.0-4.07.0-5.0-1.01.0-2.020-3.01.33.1-0.2-42.6-8.3-7.5-0.6-31.3-18.1130.7-10.92411-79.04.21910-94.616142.6
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossTax

us-gaap:OtherComprehensiveIncomeLossTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-55.0111225-41.0-241.0211410-37.0-73.0-101.0-223.04.01663177-6.8-25.8-46.627-3.1-32.4429.6-123.7-131.348-96.5-85.2828011111-188.110-40.195-12.965
Percentage of OtherComprehensiveIncomeLossTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToNoncontrollingInterest

us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToNoncontrollingInterest


Other
Period End2021-06-302021-03-312020-06-302020-03-31
Value1000000.01000000.000
Percentage of OtherComprehensiveIncomeLossTaxPortionAttributableToNoncontrollingInterest100.0100.00.00.0

us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1

us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1


Other
Period End2021-06-302021-03-312020-06-302020-03-31
Value-56.0110-241.0211
Percentage of OtherComprehensiveIncomeLossTaxPortionAttributableToParent1100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2.04.02.04.03.03.015-34.00.03.03.02.02.9283.1-4.9-79.817385-17.2-190.0-265.529-76.50.90.90.8-5.90.80.70.80.70.80.70.7-1.0-0.20.60.6-11.30.30.40.5-7.3-7.90.2
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-1.0-1.05.00.0-1.0-1.0-2.0-2.00.00.019-1.0-0.7-7.8-71.32.536-2.7-301.59.210214215-41.30.50.50.5-3.20.40.40.40.40.40.40.4-0.6-0.10.4
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax100.0100.0100.00.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value201-332.0324113730-689.0-31.0116238357-65.0-36.0-72.0-244.7-17.28.610080-269.55.3209172-62.3-141.2-241.260-33.0-133.31441403216-377.834-251.7168-27.110732-202.38512-187.7233-20.199
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities

us-gaap:CorporateDebtSecurities, us-gaap:FixedMaturities


Other
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value1.0-9.0-22.0-12.044-2.01.0
Percentage of OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities100.0100.0100.0100.0100.0100.0100.0

us-gaap:ResidentialMortgageBackedSecurities, us-gaap:FixedMaturities


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value1.01.00.00.00.00.0
Percentage of OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities-11.1-4.5-0.00.0-0.00.0

us-gaap:OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities us-gaap:InvestmentType

us-gaap:FixedMaturities


Other
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value1.0-8.0-21.0-12.044-2.01.01.03.01.02.00.00.00.10.0
Percentage of OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities100.088.995.5100.0100.0100.0100.00.00.00.00.00.00.00.00.0

us-gaap:PaymentsForLossesAndLossAdjustmentExpense

us-gaap:PaymentsForLossesAndLossAdjustmentExpense


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value23521217792195321702188131985320596196681897217577171511767117398171051832017319175501706116924164281649215246
Percentage of PaymentsForLossesAndLossAdjustmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForLossesAndLossAdjustmentExpense us-gaap:StatementBusinessSegments

antm:CommercialSpecialtyBusinessSegment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value6539591065186513544957836813648167035306615361786018601778206989724366227349677570166205
Percentage of PaymentsForLossesAndLossAdjustmentExpense27.827.129.730.029.029.133.133.035.330.235.935.034.635.242.740.441.338.843.441.242.540.7

antm:GovernmentBusinessSegment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1659615506150241480513006139321378313187122691227110998114931138011088104991032910306104389575965394759041
Percentage of PaymentsForLossesAndLossAdjustmentExpense70.671.268.468.269.170.266.967.064.769.864.165.065.464.857.359.658.761.256.658.857.559.3

antm:OtherSegment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value3863634113843581380.00.0
Percentage of PaymentsForLossesAndLossAdjustmentExpense1.61.71.91.81.90.70.00.0

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForProceedsFromOtherInvestingActivities


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value14156.0-761.0699101171526-8.088-1.8-11.6-3.60.0-0.10.0-11.80.03.00.00.02.26.00.00.00.00.00.00.1-5.10.03.80.0-4.00.00.30.61.46.69.7132524214.3
Percentage of PaymentsForProceedsFromOtherInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.00.0100.00.00.0100.0100.00.00.00.00.00.0100.0100.00.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForRestructuring us-gaap:RestructuringCostAndReserve

us-gaap:PaymentsForRestructuring

us-gaap:EmployeeSeverance


Payments
Period End2021-06-302021-03-31
Value1511
Percentage of PaymentsForRestructuring100.0100.0

us-gaap:PaymentsForRestructuring us-gaap:RestructuringCostAndReserve, us-gaap:StatementBusinessSegments

us-gaap:EmployeeSeverance, antm:CommercialSpecialtyBusinessSegment


Payments
Period End2021-06-302021-03-31
Value7.05.0
Percentage of PaymentsForRestructuring46.745.5

us-gaap:EmployeeSeverance, antm:GovernmentBusinessSegment


Payments
Period End2021-06-302021-03-31
Value8.05.0
Percentage of PaymentsForRestructuring53.345.5

us-gaap:EmployeeSeverance, antm:OtherSegment


Payments
Period End2021-06-302021-03-31
Value0.01.0
Percentage of PaymentsForRestructuring0.09.1

us-gaap:PaymentsOfDebtExtinguishmentCosts us-gaap:DebtInstrument

us-gaap:PaymentsOfDebtExtinguishmentCosts

us-gaap:ConvertibleDebt


Payments
Period End2021-06-30
Value252
Percentage of PaymentsOfDebtExtinguishmentCosts100.0

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value2.091161.04.01072.02.02.0784.01.42.4730.50.43.7412.10.57.655
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value3415273.067-2.019080.00.00.00.0289.537613462045330.00.00.00.00.00.02.7-5.45.86350.00.00.00.00.00.03604879041.2-2.36020.00.0-0.5
Percentage of PaymentsToAcquireBusinessesNetOfCashAcquired100.0100.0100.0100.0100.0100.00.00.00.00.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.0100.0100.0100.0100.00.00.00.00.00.00.0100.0100.0100.0100.0100.0100.00.00.0100.0

us-gaap:ProceedsFromDivestitureOfBusinesses us-gaap:LitigationCase

us-gaap:ProceedsFromDivestitureOfBusinesses

antm:AnthemInc.v.ExpressScriptsInc.


Proceeds
Period End2021-06-302021-03-312020-12-31
Value0.046750.0
Percentage of ProceedsFromDivestitureOfBusinesses0.0100.00.0

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1248998978192712395978546895013934964256533624604214435224393883412492963523942703023703612843466873114904334723984773303564147907786726561213
Percentage of ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value204171-135.0-17.0657-17.0-420.0173376.0
Percentage of ProceedsFromPaymentsForOtherFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromRepaymentsOfCommercialPaper

us-gaap:ProceedsFromRepaymentsOfCommercialPaper


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value550-250.02500.0-1305.0905-100.0-400.025178-53.0649-595.7-108.0-511.9-661.3-371.3171912447-147.9-77.3-283.626858638-425.7-441.4108379-415.8-126.990260-259.140-48.337-195.057-162.2763-54.9-109.0
Percentage of ProceedsFromRepaymentsOfCommercialPaper100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfAvailableForSaleSecurities

us-gaap:ProceedsFromSaleOfAvailableForSaleSecurities


Proceeds
Period End2021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value53234597261819312849204819861468196715322653222736203384294135143488292124803062291527033234292532562038256024012841541123003117582234923228
Percentage of ProceedsFromSaleOfAvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfAvailableForSaleSecurities us-gaap:InvestmentType

us-gaap:FixedMaturities


Proceeds
Period End2021-06-302020-06-30
Value6272618
Percentage of ProceedsFromSaleOfAvailableForSaleSecurities0.0100.0

us-gaap:ProceedsFromShortTermDebt

us-gaap:ProceedsFromShortTermDebt


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value0.0150-255.0107511101675209527103820197018251505198516601020117054044044098010054012708503001006809705005000.0100250922001000.00.00.01000.00.0
Percentage of ProceedsFromShortTermDebt0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.00.00.00.0100.00.00.0

us-gaap:ProceedsFromStockOptionsExercised

us-gaap:ProceedsFromStockOptionsExercised


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value52896420484450372476403835594726471032819205016144510932855213014922112923243.0483515141674727232269
Percentage of ProceedsFromStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RepaymentsOfShortTermDebt

us-gaap:RepaymentsOfShortTermDebt


Repayments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value1500.08207001120197521802760394518201830165518901060980107054044054098010054011808000.025010207804505000.00.01921001001000.00.00.0100
Percentage of RepaymentsOfShortTermDebt100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.00.00.00.0100.0

us-gaap:RestructuringAndRelatedCostIncurredCost

us-gaap:RestructuringAndRelatedCostIncurredCost


Restructuring
Period End2020-09-30
Value607
Percentage of RestructuringAndRelatedCostIncurredCost100.0

us-gaap:RestructuringAndRelatedCostIncurredCost antm:RestructuringActivityOfIndividualSegmentsReporting

antm:CommercialSpecialtyBusinessSegment


Restructuring
Period End2020-09-30
Value299
Percentage of RestructuringAndRelatedCostIncurredCost49.3

antm:GovernmentBusinessSegment


Restructuring
Period End2020-09-30
Value183
Percentage of RestructuringAndRelatedCostIncurredCost30.1

antm:IngenioRxSegment


Restructuring
Period End2020-09-30
Value3.0
Percentage of RestructuringAndRelatedCostIncurredCost0.5

antm:OtherSegment


Restructuring
Period End2020-09-30
Value122
Percentage of RestructuringAndRelatedCostIncurredCost20.1

us-gaap:RestructuringAndRelatedCostIncurredCost us-gaap:RestructuringCostAndReserve

antm:LeaseImpairment


Restructuring
Period End2020-09-30
Value224
Percentage of RestructuringAndRelatedCostIncurredCost36.9

antm:PPEImpairment


Restructuring
Period End2020-09-30
Value195
Percentage of RestructuringAndRelatedCostIncurredCost32.1

us-gaap:EmployeeSeverance


Restructuring
Period End2020-09-30
Value188
Percentage of RestructuringAndRelatedCostIncurredCost31.0

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability


Right
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1451412173332379330.00.0
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.0100.00.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod


Share
Period End2020-12-31
Value0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod0.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue


Share
Period End2021-06-302021-03-312020-12-31
Value8.3279.371.26
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value1.18311.320.26-0.030.11272.03-0.25-0.95-0.51307.590.461.46-0.34232.150.826.330.35166.94-0.07-0.020.07131.83-0.220.120.25146.850.160.20.7489.430.370.230.6561.81
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod


Share
Period End2021-06-302021-03-312020-12-31
Value0800000.0100000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod0.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue


Share
Period End2021-06-302021-03-312020-12-31
Value0.04244.21.95
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value00.361.050.346500.00350.0074000.00260.00977000.003230.01203000.003970.01509000.004910.01275000.004250.015000.0050.018000.0060.012000.0040.01121000.00379
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate0.0100.0100.0100.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value030.0025.7400.260000.250000.30000.320000.320000.310000.350000.350000.340000.340000.34
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate0.0100.00.0100.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value01.4401.28700.0130000.02690000.0290000.02310000.01760000.01960000.02160000.01250000.01410000.02840000.0309
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate0.0100.00.0100.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod


Share
Period End2020-12-31
Value0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod0.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice


Share
Period End2021-06-302021-03-312020-12-31
Value9.55277.152.37
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod


Share
Period End2021-06-302021-03-312020-12-31
Value0700000.00
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod0.0100.00.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross

antm:A2017to2019, us-gaap:RestrictedStockUnitsRSU


Share
Period End2021-06-302021-03-312020-09-302020-06-302020-03-31
Value0300000.000600000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross0.0100.00.00.0100.0

antm:A2020to2022, us-gaap:RestrictedStockUnitsRSU


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value0300000.00100000.00200000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross0.0100.00.00.00.033.3

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value0.1979.030.03-0.020.0154.03-0.03-0.11-0.1268.920.040.17-0.0455.310.040.070.0440.73-0.0100.0230.55-0.050.010.0633.950.010.030.1722.20.040.070.0214.51-0.01-0.020.0216.5100.030.0317.780-0.06
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice


Share
Period End2021-06-302021-03-312020-12-31
Value7.92185.6313.53
Percentage of ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice


Share
Period End2021-06-302021-03-312020-12-31
Value0.86311.470.29
Percentage of ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice100.0100.0100.0

us-gaap:ShortTermLeaseCost

us-gaap:ShortTermLeaseCost


Short
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value121212111413139.01212
Percentage of ShortTermLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value300000.0900000.0200000.0300000.01000000.0300000.0200000.01100000.0300000.0400000.0300000.01100000.0500000.0200000.0500000.01700000.0300000.0200000.0400000.01600000.0200000.0100000.0700000.02500000.0400000.01000000.0900000.02900000.0
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised


Stock
Period End2021-06-302021-03-312020-12-31
Value200000.0400000.0300000.0
Percentage of StockIssuedDuringPeriodSharesStockOptionsExercised100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value11962981133.01209169126956928866888996363616060538710674138891421862631734853834024522164765646868
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value11962981133.01209169126956928866888996363616060538710674138891421872631734853834024522164765646868
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchasedAndRetiredDuringPeriodShares

us-gaap:StockRepurchasedAndRetiredDuringPeriodShares


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-02-082012-02-092011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1.31.44.42.90.21.91.12.41.71.11.81.61.71.71.85.92.50.30.00.74.05.72.85.08.3141.1e-064.910139.411179.22820
Percentage of StockRepurchasedAndRetiredDuringPeriodShares100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchasedAndRetiredDuringPeriodShares us-gaap:StatementEquityComponents

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1.31.42.90.21.92.41.71.11.81.61.71.71.85.92.50.30.00.74.05.72.85.08.31410139.411179.22820
Percentage of StockRepurchasedAndRetiredDuringPeriodShares100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-02-082012-02-092011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value4804471358758555293056444582944933974013943621126458500.0105636774343578814126264333685897714741101546314931388
Percentage of StockRepurchasedAndRetiredDuringPeriodValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value47531069.071907071695860566020184100.024145212105187-62.2884354458323387606308972708
Percentage of StockRepurchasedAndRetiredDuringPeriodValue9.811.914.016.413.414.015.324.114.014.615.014.316.617.918.420.70.023.322.827.430.832.4-7.670.051.751.145.252.259.766.665.151.0

us-gaap:CommonStock


Stock
Period End2021-03-312020-06-302019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.00.00.20.00.10.10.10.10.20.00.30.2
Percentage of StockRepurchasedAndRetiredDuringPeriodValue0.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value43339365246458554388223424339341338302925373400.080491561237391876378330439391354409154520679
Percentage of StockRepurchasedAndRetiredDuringPeriodValue90.287.986.083.686.686.084.775.986.085.485.085.783.482.181.679.30.076.777.272.569.267.6107.630.048.348.954.847.840.333.434.949.0

us-gaap:SubleaseIncome

us-gaap:SubleaseIncome


Sublease
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.01.01.01.04.03.04.04.04.04.0
Percentage of SubleaseIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense


Supplemental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value24128242152311721999187482123020538199201944318794170051784217462172711836617819177181796817280166391647315979
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense us-gaap:StatementBusinessSegments

antm:CommercialSpecialtyBusinessSegment


Supplemental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value6785657569306646522860906956652667655695605561866027582578517447733970847404699668766520
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense28.127.230.030.227.928.733.932.834.830.335.634.734.533.742.741.841.439.442.942.041.740.8

antm:GovernmentBusinessSegment


Supplemental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1694317289157771497313152150101358213394126781309910950116551143511445105151037110378108849875964295979459
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense70.271.468.268.170.270.766.167.265.269.764.465.365.566.357.358.258.660.657.158.058.359.2

antm:OtherSegment


Supplemental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value4003514103803681300.00.0
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense1.71.41.81.72.00.60.00.0

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense


Supplemental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value2841488-63.00.00.07006323-41.04556461159645981151567947746-27.7754
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense us-gaap:StatementBusinessSegments

antm:CommercialSpecialtyBusinessSegment


Supplemental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value67503-4.05.08129328-20.0-15.0197311869337476.774334385.8-17.3439
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense23.633.86.30.00.041.944.4-87.036.643.348.430.443.552.247.95.847.942.050.012.562.558.2

antm:GovernmentBusinessSegment


Supplemental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value220970-59.0-5.0-81.04073543-26.025833429030851108814603840-10.4314
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense77.565.293.70.00.058.155.6187.063.456.751.669.656.547.852.194.252.158.050.087.537.541.8

antm:OtherSegment


Supplemental
Period End2021-06-302021-03-312020-06-302020-03-312019-06-302019-03-31
Value-3.0150.00.00.00.0
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense-1.11.00.00.0-0.00.0

us-gaap:SupplementaryInsuranceInformationOtherOperatingExpense

us-gaap:SupplementaryInsuranceInformationOtherOperatingExpense


Supplementary
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value919972922799959856884943404424420399355368329304
Percentage of SupplementaryInsuranceInformationOtherOperatingExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value2.93.23.23.24.04.84.35.25.95.87.06.56.26.04.95.25.77.91113119.27.77.13.72.73.03.54.04.45.45.34.64.55.5
Percentage of WeightedAverageNumberDilutedSharesOutstandingAdjustment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:AccumulatedOtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax

antm:AccumulatedOtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value-1000000.06000000.06000000.0-1000000.0-3000000.0-4000000.0-3000000.0-4000000.0-3000000.0-3000000.0-3000000.0-2000000.0-2100000.0-1400000.0-2100000.0-2400000.0-3100000.0-4200000.0-6300000.0-7900000.0-8700000.0-7500000.0-9500000.0-8000000.0-8600000.0-9700000.0-4300000.0-2100000.01600000.02000000.02200000.0
Percentage of AccumulatedOtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:AccumulatedOtherComprehensiveIncomeLossAdjustmentForNoncontrollingInterest

antm:AccumulatedOtherComprehensiveIncomeLossAdjustmentForNoncontrollingInterest


Accumulated
Period End2021-06-302021-03-31
Value-4000000.0-2000000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossAdjustmentForNoncontrollingInterest100.0100.0

antm:AccumulatedOtherComprehensiveIncomeLossNonCreditComponentofImpairmentLossonInvestmentsNetOfTax

antm:AccumulatedOtherComprehensiveIncomeLossNonCreditComponentofImpairmentLossonInvestmentsNetOfTax


Accumulated
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value1.08.024344.03.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNonCreditComponentofImpairmentLossonInvestmentsNetOfTax100.0100.0100.0100.0100.0100.0

antm:Accumulatedothercomprehensiveincomelossnoncreditcomponentofimpairmentsoninvestments

antm:Accumulatedothercomprehensiveincomelossnoncreditcomponentofimpairmentsoninvestments


Accumulatedothercomprehensiveincomelossnoncreditcomponentofimpairmentsoninvestments
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value1.03.01132443.05.04.0
Percentage of Accumulatedothercomprehensiveincomelossnoncreditcomponentofimpairmentsoninvestments100.0100.0100.0100.0100.0100.0100.0100.0

antm:AssumedPremiumsReceivable

antm:AssumedPremiumsReceivable


Assumed
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value34735373225235.414
Percentage of AssumedPremiumsReceivable100.0100.0100.0100.0100.0100.0100.0100.0

antm:AvailableForSaleSecuritiesAccumulatedOtherComprehensiveIncomeNetDeferredTaxLiability

antm:AvailableForSaleSecuritiesAccumulatedOtherComprehensiveIncomeNetDeferredTaxLiability


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value-240.0-186.0-302.0-216.0-183.051-155.0-164.0-130.0-61.0392415-4.7-301.1-309.9-304.0-245.3-206.5-364.0-358.6-223.2-124.2-157.7-241.3-375.3-330.5-345.0-425.9-345.4-267.4
Percentage of AvailableForSaleSecuritiesAccumulatedOtherComprehensiveIncomeNetDeferredTaxLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostNoncurrent

antm:AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostNoncurrent


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value558537532530491489487500493482486501489504556524516556524522493494550563613523500455
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:CashFlowHedgingInstrumentsAccumulatedOtherComprehensiveIncomeNetDeferredTaxAsset

antm:CashFlowHedgingInstrumentsAccumulatedOtherComprehensiveIncomeNetDeferredTaxAsset


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value64656667676869636565656666671251271248890298289186435918181919161717
Percentage of CashFlowHedgingInstrumentsAccumulatedOtherComprehensiveIncomeNetDeferredTaxAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:CommercialPaperMaximumBorrowingCapacity us-gaap:LongtermDebtType

antm:CommercialPaperMaximumBorrowingCapacity

us-gaap:CommercialPaper


Commercial
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-302019-06-30
Value3500350035003500350035002500
Percentage of CommercialPaperMaximumBorrowingCapacity100.0100.0100.0100.0100.0100.0100.0

antm:DeferredNetActuarialGainLossPostretirementBenefits

antm:DeferredNetActuarialGainLossPostretirementBenefits


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value-3000000.0-2000000.0-3000000.0-25000000.0-25000000.0-25000000.0-25000000.0-57000000.0-57000000.0-57000000.0-58000000.0-75000000.0-75700000.0-76600000.0-77500000.0-138000000.0-140900000.0-143700000.0-146600000.0-153400000.0-156500000.0-159600000.0-162700000.0-199800000.0-203600000.0-194800000.0-211200000.0-150000000.0-152400000.0-154700000.0-169600000.0
Percentage of DeferredNetActuarialGainLossPostretirementBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:DeferredPriorServiceCostCreditPostretirementBenefitPlans

antm:DeferredPriorServiceCostCreditPostretirementBenefitPlans


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value-10.0-11.0121416181925283134373942464952-56.3-59.7-63.2-66.6-70.1-73.5-77.2-80.8-71.8-88.0-79.0-82.6-86.2-102.4
Percentage of DeferredPriorServiceCostCreditPostretirementBenefitPlans100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:DeferredTaxAssetsLeasingArrangements

antm:DeferredTaxAssetsLeasingArrangements


Deferred
Period End2020-12-312019-12-31
Value204180
Percentage of DeferredTaxAssetsLeasingArrangements100.0100.0

antm:DeferredTaxAssetsRelatedToDepreciationAndAmortization

antm:DeferredTaxAssetsRelatedToDepreciationAndAmortization


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value3748474154442933
Percentage of DeferredTaxAssetsRelatedToDepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0

antm:DeferredTaxLiabilitiesInvestmentBasis

antm:DeferredTaxLiabilitiesInvestmentBasis


Deferred
Period End2020-12-312019-12-312018-12-312017-12-31
Value40778520.0
Percentage of DeferredTaxLiabilitiesInvestmentBasis100.0100.0100.00.0

antm:DeferredTaxLiabilitiesRelatingToCapitalizedSoftwareOther

antm:DeferredTaxLiabilitiesRelatingToCapitalizedSoftwareOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value670528461324450436403
Percentage of DeferredTaxLiabilitiesRelatingToCapitalizedSoftwareOther100.0100.0100.0100.0100.0100.0100.0

antm:DeferredTaxLiabilityPostretirementBenefits

antm:DeferredTaxLiabilityPostretirementBenefits


Deferred
Period End2021-06-302021-03-312020-12-31
Value2000000.02000000.0-2000000.0
Percentage of DeferredTaxLiabilityPostretirementBenefits100.0100.0100.0

antm:DeferredTaxliabilitiesDeferredExpenseRetirementbenefits

antm:DeferredTaxliabilitiesDeferredExpenseRetirementbenefits


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value260194183170267252241231
Percentage of DeferredTaxliabilitiesDeferredExpenseRetirementbenefits100.0100.0100.0100.0100.0100.0100.0100.0

antm:DefinedBenefitFairValueDueFromBrokers

antm:DefinedBenefitFairValueDueFromBrokers


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value646469152.83.4-0.23.9
Percentage of DefinedBenefitFairValueDueFromBrokers100.0100.0100.0100.0100.0100.0100.0100.0

antm:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeAdjustmentsNetOfTax

antm:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeAdjustmentsNetOfTax


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value539-549.0559518527539547543-549.0-554.0559-435.0-445.0-454.3381-385.3-390.3394399373376380384323328333338243246250254
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeAdjustmentsNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetDeferredTaxAsset

antm:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetDeferredTaxAsset


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value-184000000.0-186000000.0-190000000.0-178000000.0-181000000.0-185000000.0-188000000.0-188000000.0-190000000.0-191000000.0-193000000.0-153000000.0-155500000.0-158800000.0-244100000.0-248400000.0-251600000.0-254800000.0-257200000.0-243000000.0-245100000.0-247800000.0-250400000.0-213400000.0-217100000.0-220300000.0-223200000.0-162300000.0-164800000.0-167500000.0-169900000.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetDeferredTaxAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:EquitySecurities

antm:EquitySecurities


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value17463630155930753470570103923291525124415262306246823743632
Percentage of EquitySecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

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


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value6.01251711971.02.023679644601
Percentage of EquitySecurities0.33.411.06.40.00.422.734.22.939.4

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


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value15963409115426463224245445635102.0
Percentage of EquitySecurities91.493.974.086.092.943.04.224.233.40.1

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


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value67313028313031333353
Percentage of EquitySecurities3.80.91.90.90.95.33.01.42.23.5

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


Equity
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value144143152211643631633557
Percentage of EquitySecurities9.24.74.437.061.927.141.536.5

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


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value77656061628285306305313
Percentage of EquitySecurities4.41.83.82.01.814.48.213.120.020.5

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

us-gaap:FairValueInputsLevel1, us-gaap:EquitySecurities


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value1602353413252843322524728013595543176031295146513462446
Percentage of EquitySecurities91.897.485.092.592.943.326.958.436.325.539.556.259.456.767.4

us-gaap:FairValueInputsLevel2, us-gaap:EquitySecurities


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value6731174171183241674664666630610693690724897
Percentage of EquitySecurities3.80.911.25.65.342.364.928.543.750.640.030.128.030.524.7

us-gaap:FairValueInputsLevel3, us-gaap:EquitySecurities


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value77656061628285306305297313318312303287
Percentage of EquitySecurities4.41.83.82.01.814.48.213.120.023.920.513.812.612.87.9

antm:EquitySecurities us-gaap:FinancialInstrument

antm:CommonEquitySecurities


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value73156201225323226782977654
Percentage of EquitySecurities4.24.312.97.30.95.625.735.65.042.9

antm:FixedMaturityMutualFunds


Equity
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value144143152211643631633557
Percentage of EquitySecurities9.24.74.437.061.927.141.536.5

us-gaap:ExchangeTradedFunds


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value15963409115426463224245445635102.0
Percentage of EquitySecurities91.493.974.086.092.943.04.224.233.40.1

us-gaap:PrivateEquityFunds


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value77656061628285306305313
Percentage of EquitySecurities4.41.83.82.01.814.48.213.120.020.5

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

antm:CommonEquitySecurities, us-gaap:EquitySecurities


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value73156201225323226782977654
Percentage of EquitySecurities4.24.312.97.30.95.625.735.65.042.9

antm:FixedMaturityMutualFunds, us-gaap:EquitySecurities


Equity
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value144143152211643631633557
Percentage of EquitySecurities9.24.74.437.061.927.141.536.5

us-gaap:ExchangeTradedFunds, us-gaap:EquitySecurities


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value15963409115426463224245445635102.0
Percentage of EquitySecurities91.493.974.086.092.943.04.224.233.40.1

us-gaap:PrivateEquityFunds, us-gaap:EquitySecurities


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value77656061628285306305313
Percentage of EquitySecurities4.41.83.82.01.814.48.213.120.020.5

antm:EquitySecurities us-gaap:InvestmentType

us-gaap:EquitySecurities


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value17463630155930753470570103923291525124415262306246823743632
Percentage of EquitySecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:Fairvaluehedgescumulativebasisadjustments us-gaap:BalanceSheetLocation

antm:Fairvaluehedgescumulativebasisadjustments

antm:LongtermdebtcurrentmaturitiesDomain


Fairvaluehedgescumulativebasisadjustmentsus-gaap:
Period End2020-12-312019-12-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value37227.00.01.01.12.00.3
Percentage of Fairvaluehedgescumulativebasisadjustments100.0100.0100.00.0100.0100.0100.0100.0

antm:IncreaseInStockRepurchaseProgramAuthorization us-gaap:SubsequentEventType

antm:IncreaseInStockRepurchaseProgramAuthorization

us-gaap:SubsequentEvent


Increase
Period End2021-01-26
Value5000
Percentage of IncreaseInStockRepurchaseProgramAuthorization100.0

antm:IntangibleAssetsAccumulatedAmortizationExcludingGoodwill

antm:IntangibleAssetsAccumulatedAmortizationExcludingGoodwill


Intangible
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value40573696335830182876276825582337
Percentage of IntangibleAssetsAccumulatedAmortizationExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0

antm:InvestmentInSubsidiaries us-gaap:ConsolidatedEntities

antm:InvestmentInSubsidiaries

srt:ParentCompany


Investment
Period End2020-12-312019-12-312018-12-31
Value517394742344877
Percentage of InvestmentInSubsidiaries100.0100.0100.0

antm:LesseeOperatingLeaseLeaseNotYetCommencedExpense

antm:LesseeOperatingLeaseLeaseNotYetCommencedExpense


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value65133139142
Percentage of LesseeOperatingLeaseLeaseNotYetCommencedExpense100.0100.0100.0100.0

antm:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpensePurchaseAdjustments

antm:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpensePurchaseAdjustments


Liability
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312018-12-312018-09-302018-06-302018-03-312017-12-312015-12-312014-12-312013-12-312012-12-31
Value420339339339339199199199199751210.00.0804
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpensePurchaseAdjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0

antm:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpensePurchaseAdjustments us-gaap:StatementBusinessSegments

antm:GovernmentBusinessSegment


Liability
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312018-12-312018-09-302018-06-302018-03-312017-12-312015-12-31
Value37514114114114119919919919975121
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpensePurchaseAdjustments89.341.641.641.641.6100.0100.0100.0100.0100.0100.0

antm:OtherSegment


Liability
Period End2021-06-302020-12-312020-09-302020-06-302020-03-31
Value45198198198198
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpensePurchaseAdjustments10.758.458.458.458.4

antm:NonCreditComponentofImpairmentsonInvestmentsInAccumulatedOtherComprehensiveIncomeDeferredTaxLiabilityAsset

antm:NonCreditComponentofImpairmentsonInvestmentsInAccumulatedOtherComprehensiveIncomeDeferredTaxLiabilityAsset


Non
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value1000000.03000000.08000000.010000000.01000000.01000000.01000000.0
Percentage of NonCreditComponentofImpairmentsonInvestmentsInAccumulatedOtherComprehensiveIncomeDeferredTaxLiabilityAsset100.0100.0100.0100.0100.0100.0100.0

antm:NumberOfMedicalMembersServed

antm:NumberOfMedicalMembersServed


Number
Period End2021-06-302021-03-312020-12-312020-09-30
Value44444343
Percentage of NumberOfMedicalMembersServed100.0100.0100.0100.0

antm:PatientProtectionAffordableCareActHealthInsuranceProviderFee

antm:PatientProtectionAffordableCareActHealthInsuranceProviderFee


Patient
Period End2020-12-312018-12-312016-12-312015-12-312014-12-31
Value155231430011300113008000
Percentage of PatientProtectionAffordableCareActHealthInsuranceProviderFee100.0100.0100.0100.0100.0

antm:PatientProtectionAffordableCareActHealthInsuranceProviderFee us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


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

antm:SelfFundedReceivablesNet

antm:SelfFundedReceivablesNet


Self
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value36053109284929852460261324112555253424912278263126502579
Percentage of SelfFundedReceivablesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:SelffundedReceivablesAllowanceForDoubtfulAccounts

antm:SelffundedReceivablesAllowanceForDoubtfulAccounts


Selffunded
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312018-09-302018-06-302017-12-31
Value91515455525546474052153
Percentage of SelffundedReceivablesAllowanceForDoubtfulAccounts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:ShortDurationContractLiabilityForClaimsAdjustmentExpense

antm:ShortDurationContractLiabilityForClaimsAdjustmentExpense


Short
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value12821120761113599919655969086478770854980287266746873607453781476567360
Percentage of ShortDurationContractLiabilityForClaimsAdjustmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:ShortDurationContractLiabilityForClaimsAdjustmentExpense us-gaap:StatementBusinessSegments

antm:CommercialSpecialtyBusinessSegment


Short
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value36333452329429672799307630392918285927762586267727162774338332473371
Percentage of ShortDurationContractLiabilityForClaimsAdjustmentExpense28.328.629.629.729.031.735.133.333.434.635.635.836.937.243.342.445.8

antm:GovernmentBusinessSegment


Short
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value89588456764668286656642456085852569052524680479146444679443144093989
Percentage of ShortDurationContractLiabilityForClaimsAdjustmentExpense69.970.068.768.368.966.364.966.766.665.464.464.263.162.856.757.654.2

antm:OtherSegment


Short
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-06-302019-03-312018-12-31
Value2301681951962001900.00.00.00.0
Percentage of ShortDurationContractLiabilityForClaimsAdjustmentExpense1.81.41.82.02.12.00.00.00.00.0

antm:ShortdurationcontractliabilityforunpaidclaimsandadjustmentexpenseNet

antm:ShortdurationcontractliabilityforunpaidclaimsandadjustmentexpenseNet


Shortdurationcontractliabilityforunpaidclaimsandadjustmentexpense
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value12780120371108998629565963086148735850679947232743173257419770971176714
Percentage of ShortdurationcontractliabilityforunpaidclaimsandadjustmentexpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

antm:ShortdurationcontractliabilityforunpaidclaimsandadjustmentexpenseNet us-gaap:StatementBusinessSegments

antm:CommercialSpecialtyBusinessSegment


Shortdurationcontractliabilityforunpaidclaimsandadjustmentexpense
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value362234433281286527373039302529102845276825762667<