CI


Line plots across dimensions of each concept
Tables

Table of contents



us-gaap:CommonStockValue

us-gaap:CommonStockParOrStatedValuePerShare

us-gaap:CommonStockSharesIssued

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:Revenues
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:PremiumsEarnedNet
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:NetInvestmentIncome
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:IncomeTaxExpenseBenefit

us-gaap:Assets

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:ShortTermInvestments

us-gaap:ReceivablesNetCurrent

us-gaap:InventoryNet

us-gaap:OtherAssetsCurrent

us-gaap:LongTermInvestments
us-gaap:FinancialInstrument, ci:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:OtherAssetsNoncurrent

us-gaap:LiabilitiesCurrent

us-gaap:DebtCurrent
us-gaap:DebtInstrument
us-gaap:LongTermDebtCurrent

us-gaap:AccountsPayableCurrent
us-gaap:DebtInstrument
us-gaap:LongTermDebtNoncurrent

us-gaap:MinorityInterest

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:TreasuryStockValue

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:ProfitLoss

us-gaap:DepreciationDepletionAndAmortization

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:IncreaseDecreaseInInventories

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:RepaymentsOfLongTermDebt
us-gaap:DebtInstrument
us-gaap:DebtInstrumentInterestRateStatedPercentage
us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:ProceedsFromRepaymentsOfShortTermDebt

ci:AdjustedIncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

ci:ComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterestIncludingTemporaryEquity

ci:EarningsPerShareEffectOfDilution
us-gaap:FairValueByAssetClass
ci:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossAttributedToInstrumentsHeldIncludedInEarnings
us-gaap:FairValueByAssetClass
ci:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossRequiredToAdjustFuturePolicyBenefits
us-gaap:Range, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
ci:FinancingReceivableCreditQualityDebtServiceCoverageBeforeReclassificationToDisposalGroupAssetsHeldForSale
us-gaap:Range, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:LoanToValue
us-gaap:Range, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
ci:FinancingReceivableCreditQualityLoanToValueRatioBeforeReclassificationToDisposalGroupAssetsHeldForSale
us-gaap:ProductOrService, us-gaap:GuaranteedInsuranceContractTypeOfBenefit
ci:GuaranteedMinimumDeathBenefitsTotalContractholders
us-gaap:StatementBusinessSegments
ci:ImpactOfPriorYearDevelopmentOnPretaxIncome
us-gaap:StatementBusinessSegments
ci:ImpactOfPriorYearDevelopmentOnShareholdersNetIncome

ci:ImpairmentsOnInvestmentsTotal

ci:IncomeLossAttributableToNoncontrollingInterestBeforeTax
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

ci:IncreaseDecreaseInAccountsPayableAccruedAndOtherOperatingLiabilities

ci:IncreaseDecreaseInPharmacyAndServiceCostsPayable
us-gaap:NoncatastrophicEvent, us-gaap:StatementBusinessSegments
ci:LiabilityForUnpaidMedicalClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYearsPercentage
us-gaap:StatementBusinessSegments

ci:NonInvestmentRevenue
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

ci:NoncontrollingInterestOtherChanges
us-gaap:StatementEquityComponents

ci:OrganizationalEfficiencyPlanCharges
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

ci:OrganizationalEfficiencyPlanChargesNetOfTax

ci:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAndDerivativesAdjustmentNetOfTax
us-gaap:StatementEquityComponents
ci:OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTaxIncludingTemporaryEquity
us-gaap:StatementEquityComponents
ci:OtherComprehensiveIncomeLossBeforeReclassificationsTaxIncludingTemporaryEquity

ci:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxIncludingTemporaryEquity

ci:OtherComprehensiveIncomeLossNetOfTaxIncludingTemporaryEquity
us-gaap:StatementEquityComponents

ci:PaymentsForProceedsFromPropertyPlantAndEquipment

ci:PaymentsToAcquireDebtAndEquitySecurities
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
ci:ProceedsFromIssuanceOfLongTermDebtNetOfDiscountsAndUnderwritingFees

ci:ProceedsFromMaturitiesPrepaymentsAndCallsOfDebtAndEquitySecurities

ci:ProceedsFromSaleOfDebtAndEquitySecurities

ci:RealizedInvestmentGainLoss

ci:RealizedInvestmentGainLossExcludingImpairments

ci:RealizedInvestmentGainLossIncludingEquityMethodSubsidiaries
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

ci:RealizedInvestmentGainsLossesEquityMethodInvestments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

ci:SegmentRevenues
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

ci:SpecialItemChargeAfterTaxLitigation

ci:SpecialItemChargeBeforetaxLitigation
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

ci:SpecialItemChargesDebtExtinguishmentCostsBeforeTax
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

ci:SpecialItemChargesDebtExtinguishmentCostsNetOfTax

ci:SpecialItemGainLossFromContractAdjustmentBeforeTaxes
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

ci:SpecialItemGainLossFromContractAdjustmentNetOfTax

ci:SpecialItemGainOrLossBeforeTaxAttributableToReportngEntity

ci:SpecialItemGainOrLossNetOfTaxAttributableToReportngEntity

ci:SpecialItemsIncreaseDecreaseToRevenues
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments
ci:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpenseLessInterestAccretion

ci:TemporaryEquityOtherComprehensiveIncome
us-gaap:StatementEquityComponents

ci:TransactionRelatedCosts
us-gaap:ConsolidationItems

ci:TransactionRelatedCostsAfterTax

us-gaap:AdditionsToContractHoldersFunds

us-gaap:AmortizationOfIntangibleAssets
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:BenefitsLossesAndExpenses

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CededPremiumsEarned

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
us-gaap:CededCreditRisk, us-gaap:CededCreditRiskCollateralization, us-gaap:ConcentrationRiskByBenchmark, us-gaap:GuaranteedInsuranceContractTypeOfBenefit
us-gaap:ConcentrationRiskPercentage1

us-gaap:CostOfGoodsAndServicesSold

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded

us-gaap:DebtSecuritiesAvailableForSaleRealizedGain

us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss

us-gaap:DividendsCommonStockCash
us-gaap:StatementEquityComponents

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
us-gaap:FairValueByAssetClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
us-gaap:FairValueByAssetClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
us-gaap:FairValueByAssetClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
us-gaap:FairValueByAssetClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements
us-gaap:FairValueByAssetClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
us-gaap:FairValueByAssetClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
us-gaap:FairValueByAssetClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
us-gaap:FairValueByAssetClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
us-gaap:FairValueByAssetClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3

us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:IncomeTaxesPaidNet

us-gaap:IncreaseDecreaseInAccountsAndOtherReceivables

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes

us-gaap:IncreaseDecreaseInDeferredPolicyAcquisitionCosts

us-gaap:IncreaseDecreaseInInsuranceLiabilities

us-gaap:IncreaseDecreaseInReinsuranceRecoverable

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:InterestPaidNet
us-gaap:StatementBusinessSegments
us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1
us-gaap:StatementBusinessSegments
us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1
us-gaap:StatementBusinessSegments
us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyTranslationGainLoss
us-gaap:StatementBusinessSegments
us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NetIncomeLossAttributableToNonredeemableNoncontrollingInterest

us-gaap:NetIncomeLossAttributableToRedeemableNoncontrollingInterest

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest
us-gaap:StatementEquityComponents

us-gaap:OperatingIncomeLoss
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

us-gaap:OtherNonoperatingIncomeExpense
us-gaap:StatementBusinessSegments
us-gaap:PaymentsForLossesAndLossAdjustmentExpense

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsOfDebtExtinguishmentCosts

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired

us-gaap:PaymentsToAcquireMortgageNotesReceivable

us-gaap:PaymentsToAcquireOtherInvestments

us-gaap:ProceedsFromCollectionOfLoansReceivable

us-gaap:ProceedsFromIssuanceOfCommonStock

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromSaleAndMaturityOfOtherInvestments

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodTax

us-gaap:ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded
us-gaap:ProductOrService
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:StatementBusinessSegments
us-gaap:ShortdurationInsuranceContractsDiscountedLiabilitiesInterestAccretion

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation
us-gaap:StatementEquityComponents
us-gaap:StatementBusinessSegments
us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense
us-gaap:NoncatastrophicEvent, us-gaap:StatementBusinessSegments
us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
us-gaap:StatementBusinessSegments

us-gaap:TemporaryEquityNetIncome

us-gaap:TreasuryStockValueAcquiredCostMethod
us-gaap:StatementEquityComponents

us-gaap:WeightedAverageNumberOfSharesIssuedBasic

us-gaap:WithdrawalFromContractHoldersFunds

ci:AccruedExpensesAndOtherLiabilities

ci:AllowanceForReceivablesNetCurrent
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
ci:AlternativeInvestmentBeforeReclassificationToDisposalGroupAssetsHeldForSale
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:FairValueByMeasurementFrequency

ci:AvailableForSaleDebtSecuritiesAmortizedCostBasisBeforeReclassificationToDisposalGroupAssetsHeldForSale
us-gaap:FinancialInstrument
us-gaap:StatementBusinessSegments

ci:AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTaxBeforeReclassificationToDisposalGroupAssetsHeldForSale
us-gaap:FinancialInstrument
us-gaap:StatementBusinessSegments

ci:AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTaxBeforeReclassificationToDisposalGroupAssetsHeldForSale
us-gaap:FinancialInstrument
us-gaap:StatementBusinessSegments
ci:InvestmentsCreditRating
ci:AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLossBeforeReclassificationToDisposalGroupAssetsHeldForSale
ci:InvestmentsCreditRating
ci:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLossBeforeReclassificationToDisposalGroupAssetsHeldForSale
ci:InvestmentsCreditRating
ci:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAmortizedCostBeforeReclassificationToDisposalGroupAssetsHeldForSale
ci:InvestmentsCreditRating
ci:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValueBeforeReclassificationToDisposalGroupAssetsHeldForSale
ci:InvestmentsCreditRating
ci:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCostBeforeReclassificationToDisposalGroupAssetsHeldForSale
ci:InvestmentsCreditRating
ci:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValueBeforeReclassificationToDisposalGroupAssetsHeldForSale

ci:AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
us-gaap:StatementBusinessSegments
ci:InvestmentsCreditRating
ci:AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureLessThan12MonthsNumberOfPositionsBeforeReclassificationToDisposalGroupAssetsHeldForSale
ci:InvestmentsCreditRating
ci:AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureTwelveMonthsOrLongerNumberOfPositionsBeforeReclassificationToDisposalGroupAssetsHeldForSale
ci:ShortTermInvestmentsAndCashEquivalents
ci:CashCashEquivalentsAndShortTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
ci:DerivativeAssetsBeforeReclassificationToDisposalGroupAssetsHeldForSale
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
ci:DerivativeLiabilitiesBeforeReclassificationToDisposalGroupLiabilitiesHeldForSale
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
ci:DerivativeNotionalAmountBeforeReclassificationToDisposalGroupAssetsHeldForSale
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

ci:DisposalGroupIncludingDiscontinuedOperationCurrentInsuranceAndContractholderLiabilities

ci:DisposalGroupIncludingDiscontinuedOperationCurrentInvestmentsCurrent

ci:DisposalGroupIncludingDiscontinuedOperationInsuranceAndContractholderLiabilities
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

ci:DisposalGroupIncludingDiscontinuedOperationInvestments

ci:DisposalGroupIncludingDiscontinuedOperationInvestmentsCurrent
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

ci:DisposalGroupIncludingDiscontinuedOperationNoncurrentInsuranceAndContractholderLiabilities

ci:DisposalGroupIncludingDiscontinuedOperationNoncurrentInvestmentsCurrent

ci:DisposalGroupIncludingDiscontinuedOperationSeparateAccountAssetsCurrent

ci:EquitySecuritiesFVNIAndWithoutReadilyDeterminableFairValueAndHybridInstrumentsAmortizedCostBeforeReclassificationToDisposalGroupAssetsHeldForSale

ci:EquitySecuritiesFVNIAndWithoutReadilyDeterminableFairValueAndHybridInstrumentsCarryingAmount

ci:EquitySecuritiesFvNiBeforeReclassificationToDisposalGroupAssetsHeldForSale
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency

ci:EquitySecuritiesFvNiCostBeforeReclassificationToDisposalGroupAssetsHeldForSale

ci:EquitySecuritiesHybridInstrumentsCarryingAmountBeforeReclassificationToDisposalGroupAssetsHeldForSale

ci:EquitySecuritiesWithoutReadilyDeterminableFairValueAmortizedCostBeforeReclassificationToDisposalGroupAssetsHeldForSale

ci:EquitySecuritiesWithoutReadilyDeterminableFairValueAmountBeforeReclassificationToDisposalGroupAssetsHeldForSale
us-gaap:FairValueByAssetClass
ci:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValueBeforeReclassificationToDisposalGroupAssetsHeldForSale

ci:FinanceLeaseRightOfUseAssetAccumulatedAmortization

ci:FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
ci:FinancingReceivableAfterAllowanceForCreditLossBeforeReclassificationToDisposalGroupAssetsHeldForSale
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:LoanToValue
ci:FinancingReceivableBeforeAllowanceForCreditLossBeforeReclassificationToDisposalGroupAssetsHeldForSale

ci:GuaranteedSeparateAccountAssetsBeforeReclassificationToDisposalGroupAssetsHeldForSale
us-gaap:FairValueByFairValueHierarchyLevel

ci:InsuranceAndContractholderLiabilities

ci:InsuranceAndContractholderLiabilitiesCurrent

ci:InsuranceAndContractholderLiabilitiesCurrentIncludingDisposalGroups

ci:InsuranceAndContractholderLiabilitiesIncludingDisposalGroups

ci:InsuranceAndContractholderLiabilitiesNoncurrent

ci:InsuranceAndContractholderLiabilitiesNoncurrentIncludingDisposalGroups

ci:InsuranceCustomerReceivables

ci:InvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale
us-gaap:InvestmentType

ci:LiabilityForClaimsAndClaimsAdjustmentExpenseAttributableToDisposalGroups
us-gaap:StatementBusinessSegments
ci:LiabilityForClaimsAndClaimsAdjustmentExpenseCurrentIncludingDisposalGroups
us-gaap:StatementBusinessSegments
ci:LiabilityForClaimsAndClaimsAdjustmentExpenseExcludingPhysicianIncentivesAndOtherExpenses
us-gaap:StatementBusinessSegments
ci:LiabilityForClaimsAndClaimsAdjustmentExpenseIncludingDisposalGroups
us-gaap:StatementBusinessSegments
ci:LiabilityForClaimsAndClaimsAdjustmentExpenseNoncurrentIncludingDisposalGroups

ci:LiabilityForFuturePolicyBenefitsAttributableToDisposalGroups

ci:LiabilityForFuturePolicyBenefitsCurrentIncludingDisposalGroups

ci:LiabilityForFuturePolicyBenefitsIncludingDisposalGroups

ci:LiabilityForFuturePolicyBenefitsNoncurrentIncludingDisposalGroups
us-gaap:StatementBusinessSegments
ci:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetIncludingDisposalGroups
us-gaap:DebtInstrument
ci:LineOfCreditFacilityDebtToAdjustedCapitalRatioCovenant
us-gaap:Range, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:ValuationTechnique
ci:LiquidityAdjustmentUsedInPricingLevel3SecuritiesDirectlyDevelopedByCompanyBeforeReclassificationToDisposalGroupAssetsHeldForSale

ci:LongTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale
us-gaap:InvestmentType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
ci:MarketableSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:ValuationTechnique
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
ci:MortgageLoansOnRealEstateCommercialAndConsumerNetBeforeReclassificationToDisposalGroupAssetsHeldForSale
us-gaap:FairValueByMeasurementBasis

ci:NonGuaranteedSeparateAccountAssetsClassifiedInFairValueHierarchyBeforeReclassificationToDisposalGroupAssetsHeldForSale
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:RetirementPlanType
us-gaap:RetirementPlanType

ci:NonGuaranteedSeparateAccountAssetsPricedAtNetAssetValueAsAPracticalExpedientBeforeReclassificationToDisposalGroupAssetsHeldForSale

ci:NoninsuranceCustomerReceivablesExcludingPharmaceuticalManufacturersReceivable

ci:OtherLongTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale
us-gaap:InvestmentType

ci:OtherShortTermDebtCurrentMaturitiesOfLongTermDebtAndLeaseObligationsCurrent
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
ci:OtherShortTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale
us-gaap:FairValueByMeasurementFrequency

ci:PharmaceuticalManufacturerRebateNoninsuranceCustomer

ci:PharmaceuticalManufacturerReceivable

ci:PharmacyAndServiceCostsPayable

ci:PolicyholderContractDepositsAttributableToDisposalGroups

ci:PolicyholderContractDepositsCurrentIncludingDisposalGroups

ci:PolicyholderContractDepositsIncludingDisposalGroups

ci:PolicyholderContractDepositsNoncurrentIncludingDisposalGroups

ci:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization

ci:ReceivablesNetCurrentIncludingDisposalGroups
us-gaap:StatementBusinessSegments
ci:ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustmentsIncludingDisposalGroups

ci:ReinsuranceRecoverablesIncludingDisposalGroups
us-gaap:CededCreditRiskCollateralization
us-gaap:ProductOrService
us-gaap:ProductOrService, ci:CreditRatingNationallyRecognizedStatisticalRatingOrganizationNRSRO
us-gaap:ProductOrService, us-gaap:CededCreditRisk, ci:CreditRatingNationallyRecognizedStatisticalRatingOrganizationNRSRO
us-gaap:ProductOrService, us-gaap:CededCreditRisk, us-gaap:CededCreditRiskCollateralization, ci:CreditRatingNationallyRecognizedStatisticalRatingOrganizationNRSRO
us-gaap:ProductOrService, us-gaap:CededCreditRiskCollateralization
us-gaap:ProductOrService, us-gaap:CededCreditRiskCollateralization, ci:CreditRatingNationallyRecognizedStatisticalRatingOrganizationNRSRO
us-gaap:BalanceSheetLocation
ci:ReinsuranceRecoverablesNet

ci:ReinsuranceRecoverablesNonCurrent

ci:SeparateAccountAssetsBeforeReclassificationToDisposalGroupAssetsHeldForSale

ci:SeparateAccountAssetsClassifiedInFairValueHierarchyBeforeReclassificationToDisposalGroupAssetsHeldForSale
us-gaap:FairValueByFairValueHierarchyLevel

ci:ShortTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale
us-gaap:InvestmentType

ci:UnearnedPremiumsCurrentIncludingDisposalGroups

ci:UnearnedPremiumsIncludingDisposalGroups
us-gaap:Range, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:ValuationTechnique
ci:WeightingOfCreditSpreadsAdjustmentUsedInPricingLevel3SecuritiesDirectlyDevelopedByCompanyBeforeReclassificationToDisposalGroupAssetsHeldForSale

us-gaap:AccountsAndOtherReceivablesNetCurrent

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent
us-gaap:UnusualOrInfrequentItem
us-gaap:FinancialInstrument, ci:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:AssetsNet

us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDisposalGroupIncludingDiscontinuedOperations

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations

us-gaap:CommercialPaper

us-gaap:CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption
us-gaap:StatementEquityComponents
us-gaap:DebtInstrument
us-gaap:DebtInstrumentFaceAmount
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:ShortTermDebtType, us-gaap:SubsequentEventType
us-gaap:LongtermDebtType

us-gaap:DebtInstrumentRepurchasedFaceAmount
us-gaap:SubsequentEventType
us-gaap:FinancialInstrument
us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLoss

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredPolicyAcquisitionCosts
us-gaap:CededCreditRisk, us-gaap:GuaranteedInsuranceContractTypeOfBenefit
us-gaap:DerivativeAssets
us-gaap:GuaranteedInsuranceContractTypeOfBenefit
us-gaap:GuaranteedInsuranceContractTypeOfBenefit
us-gaap:DerivativeLiabilities

us-gaap:DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities

us-gaap:FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
us-gaap:FairValueByAssetClass
us-gaap:FairValueByAssetClass, us-gaap:InvestmentType

us-gaap:FinanceLeaseLiability

us-gaap:FinanceLeaseLiabilityCurrent

us-gaap:FinanceLeaseLiabilityNoncurrent

us-gaap:FinanceLeaseRightOfUseAsset
ci:CumulativeEffectPeriodOfAdoption
us-gaap:FinancingReceivableAllowanceForCreditLosses
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivableRecordedInvestmentCurrent
us-gaap:GainContingenciesByNature, us-gaap:SubsequentEventType
us-gaap:GainContingencyUnrecordedAmount

us-gaap:Investments

us-gaap:LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:LongTermDebtAndCapitalLeaseObligations
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:LongTermDebtFairValue
us-gaap:FairValueByMeasurementBasis
us-gaap:ProductOrService, us-gaap:LossContingenciesByNatureOfContingency
us-gaap:LossContingencyAccrualAtCarryingValue
us-gaap:ProductOrService, us-gaap:GuaranteedInsuranceContractTypeOfBenefit
us-gaap:NetAmountAtRiskByProductAndGuaranteeGeneralAccountValue
us-gaap:ProductOrService, us-gaap:GuaranteedInsuranceContractTypeOfBenefit
us-gaap:NetAmountAtRiskByProductAndGuaranteeNetAmountAtRisk

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OtherLongTermDebtNoncurrent

us-gaap:RedeemableNoncontrollingInterestEquityCarryingAmount

us-gaap:ReinsuranceRecoverablesAllowance
ci:CumulativeEffectPeriodOfAdoption
us-gaap:BalanceSheetLocation
us-gaap:RestrictedCashNoncurrent

us-gaap:SeparateAccountAssets

us-gaap:SeparateAccountsLiability

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:StatementEquityComponents, ci:CumulativeEffectPeriodOfAdoption
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents, ci:CumulativeEffectPeriodOfAdoption

us-gaap:TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests

us-gaap:TreasuryStockShares
us-gaap:FinancialInstrument, ci:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:VariableInterestEntityEntityMaximumLossExposureAmount

Tables

  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:CommonStockValue ▄▄▄▄▄▄444444NANANA74NANANA
us-gaap:CommonStockParOrStatedValuePerShare ▄▄▄▄▄▄0.010.010.010.010.010.01NANANA0.25NANANA
us-gaap:CommonStockSharesIssued █▆▄▄▄▁388386384384384381NANANA296NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding 374NA378380384NA246245245NANANANA
us-gaap:EarningsPerShareBasic ▇▆███▁▇▇█▂▅▇▅3.192.633.63.733.610.563.183.323.781.092.253.22.34
us-gaap:EarningsPerShareDiluted ▇▆███▁▇▇█▂▅▇▅3.152.63.573.73.560.553.143.293.721.072.213.152.3
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:Revenues █████▂▁▁▁▁▁▁▁38469382453855638819379461430011457114801141310632103721037410428
 us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,ci:HealthServices█████▂▁▁▁27255272602759827987269493772110911131071NANANANA
 us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,ci:IntegratedMedical█▅▅▄▅▂▁▁98609208914889689195829781748170NANANANANA
us-gaap:PremiumsEarnedNet █▅▅▄▅▁▁▁▁10840100059935980399719108899490128999NANANANA
 us-gaap:PremiumsEarnedNet us-gaap:ProductOrService ci:DisabilityLifeAccident1116NA104910691047NA10061009NANANANANA
 us-gaap:PremiumsEarnedNet us-gaap:ProductOrService,us-gaap:StatementBusinessSegments ci:IntegratedMedicalProducts,ci:IntegratedMedical8320NA754473967583NA66936685NANANANANA
 us-gaap:PremiumsEarnedNet us-gaap:ProductOrService,us-gaap:StatementBusinessSegments ci:MedicalRiskProducts,ci:IntegratedMedical█▆▆▅▄▂▁▁34613245317430653039275926972643NANANANANA
 us-gaap:PremiumsEarnedNet us-gaap:ProductOrService,us-gaap:StatementBusinessSegments ci:MedicareAdvantage,ci:IntegratedMedical█▃▃▄▄▁▂▂18811535156216101607141814551461NANANANANA
 us-gaap:PremiumsEarnedNet us-gaap:ProductOrService,us-gaap:StatementBusinessSegments ci:StopLoss,ci:IntegratedMedical█▆▅▄▄▂▂▁1161110710851067106910251010993NANANANANA
 us-gaap:PremiumsEarnedNet us-gaap:StatementBusinessSegments ci:InternationalMarkets█▇▄▄▄▃▁▂▂137513521309130113041276124512621260NANANANA
us-gaap:NetInvestmentIncome ▂▃▂▂▂█▃▂▁353355349340346444355352329NANANANA
 us-gaap:NetInvestmentIncome us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,ci:GroupDisabilityAndOther▁▄▃▄▆▄▅█162174170171180174176187NANANANANA
 us-gaap:NetInvestmentIncome us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,ci:IntegratedMedical█▅▇▁▇▁▄▅126120124111123111117120NANANANANA
 us-gaap:NetInvestmentIncome us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,ci:InternationalMarkets▆█▄▆▃▁▆▁4042394038364036NANANANANA
us-gaap:PolicyholderBenefitsAndClaimsIncurredNet █▆▅▅▅▃▁▁▁832278897734757676207108680368456772NANANANA
us-gaap:SellingGeneralAndAdministrativeExpense ▅█▅▅▄▅▂▂▁339839573413338033033480287228372745NANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▆▆███▁▅▅▅▃▄▅▄139712611763175817882281033110212187588241134890
 us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,ci:HealthServices▅▇▇█▇▁▁▁▁6949689651108942102677783NANANANA
 us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,ci:IntegratedMedical█▃▆▆█▁▄▅114074710119891157622848900NANANANANA
 us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,ci:InternationalMarkets█▆▆▆▇▁▆▅23418418419522290194173NANANANANA
us-gaap:IncomeTaxExpenseBenefit ▄▅█▇█▁▅▅▆20827740934841681259294301NANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:Assets ▅█▅▄▄▁154711155774154847154401154348153226NANANA61759NANANA
us-gaap:Liabilities ▁▃▂▄▇█109590110395110114110552111897112154NANANA47999NANANA
us-gaap:LiabilitiesAndStockholdersEquity ▅█▅▄▄▁154711155774154847154401154348153226NANANA61759NANANA
us-gaap:StockholdersEquity ██▇▆▃▁450794533844696438154240841028NANANA13711NANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:AssetsCurrent █▇▁▁▁▁308772984521168207092113620430NANANA9311NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▂▂▂▁▂▁█▁▁▁44524619457736104976385524032363427712972NANANA
us-gaap:ShortTermInvestments ▁▁▄▆▆█9739371371166516622045NANANA2136NANANA
us-gaap:ReceivablesNetCurrent █▂██▄▁117351071611719117001094110473NANANA3155NANANA
us-gaap:InventoryNet ▅▆▁▂▃█256526612160229823822821NANANA228NANANA
us-gaap:OtherAssetsCurrent █▄▃▄▁▂173314001341143611751236NANANA820NANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:LongTermInvestments ▁▂█▇▇▆206082154228904281802725726929NANANA26483NANANA
us-gaap:Goodwill ▇█▂▁▅▄445844460244462444494453744505NANANA6164NANANA
us-gaap:IntangibleAssetsNetExcludingGoodwill ▁▂▃▅▆█361623656237084377173833839003NANANA345NANANA
us-gaap:OtherAssetsNoncurrent █▆▇▆▆▁251722832379231822761630NANANA1431NANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:LiabilitiesCurrent ██▃▁▂▁403804013834447318673296931895NANANA11009NANANA
us-gaap:DebtCurrent ▅█▆▁▂▂434055144712231029152955NANANA240NANANA
 us-gaap:LongTermDebtCurrent us-gaap:DebtInstrument ci:NotesDue202026Interest█▁497496NANANA0NANANANANANANA
 us-gaap:LongTermDebtCurrent us-gaap:DebtInstrument ci:NotesDue202032Interest▄▄▄174817481748NANA0NANANANANANANA
 us-gaap:LongTermDebtCurrent us-gaap:DebtInstrument ci:NotesDue20204125Interest▁▁█351351503NANA0NANANANANANANA
 us-gaap:LongTermDebtCurrent us-gaap:DebtInstrument ci:NotesDue20204375Interest▄▄249249NANANA0NANANANANANANA
 us-gaap:LongTermDebtCurrent us-gaap:DebtInstrument ci:NotesDue20205125Interest▄▄▄▄300300300300NA0NANANANANANANA
 us-gaap:LongTermDebtCurrent us-gaap:DebtInstrument ci:NotesDue2020FloatingRateInterest▁████▁09999989989980NANANANANANANA
 us-gaap:LongTermDebtCurrent us-gaap:DebtInstrument ci:NotesDue2020FloatingRateInterestExpressScripts▄▄400400NANANA0NANANANANANANA
us-gaap:AccountsPayableCurrent █▅▂▂▂▁558550904502451744884366NANANA184NANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument ci:NotesDue202133Interest▁█████0499499499499499NANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument ci:NotesDue202134Interest██▄▄▄▁124712471246124612461245NANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument ci:NotesDue202145Interest▁█████0298298297297297NANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument ci:NotesDue2021475Interest▁█████29212721276127912821285NANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument ci:NotesDue2021FloatingRateInterest██▄▄▄▁998998997997997996NANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument ci:NotesDue2022305Interest█▆▆▃▂▁487485485483482481NANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument ci:NotesDue202239Interest▁█████972999999999998998NANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument ci:NotesDue20224Interest▁█████276747747746746746NANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument ci:NotesDue2023375Interest▁█████217930883087308730853085NANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument ci:NotesDue20233Interest█▆▅▄▂▁969966965963961959NANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument ci:NotesDue2023765Interest▁█████63100100100100100NANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument ci:NotesDue2023FloatingRateInterest███▁▁▁698698698697697697NANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument ci:NotesDue202435Interest█▅▅▄▃▁973970970969968966NANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument ci:NotesDue20254125Interest█▄▄▄▁▁218921882188218821872187NANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument ci:NotesDue202645Interest▁▃▆▆▆█150515061507150715071508NANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument ci:NotesDue202734Interest█▆▆▄▃▁140013961396139213901386NANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument ci:NotesDue20284375Interest█▆▃▃▁▁377737763775377537743774NANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument ci:NotesDue203024Interest█▁14880NANANANANANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument ci:NotesDue203848Interest█▁▁▁▁▁217921782178217821782178NANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument ci:NotesDue204032Interest█▁7420NANANANANANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument ci:NotesDue20416125Interest▁▃▆▆██490491492492493493NANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument ci:NotesDue204648Interest▁█████146414651465146514651465NANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument ci:NotesDue204849Interest█▁▁▁▁▁296529642964296429642964NANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument ci:NotesDue205034Interest█▁12350NANANANANANANANANANANA
us-gaap:MinorityInterest █▆▁▁▄█763357NANANA0NANANA
us-gaap:OtherLiabilitiesNoncurrent ██▄▄▃▁451944603919393038323470NANANA2838NANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:StockholdersEquity ██▇▆▃▁450794533844696438154240841028NANANA13711NANANA
us-gaap:CommonStockValue ▄▄▄▄▄▄444444NANANA74NANANA
us-gaap:RetainedEarningsAccumulatedDeficit █▇▆▄▃▁212982016219185178341642615088NANANA15800NANANA
us-gaap:TreasuryStockValue █▆▅▃▂▁325021931750949595104NANANA4021NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▃▇█▇▅▁-1527-941-858-965-1282-1711NANANA-1082NANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▅▇▆▃█▁▂▃▅188727932461103931921266249952025NANANANA
us-gaap:NetCashProvidedByUsedInInvestingActivities █████▁██▇-269-271-304-634475-24704125-99-1700NANANANA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁▁▁▁▁▃█▂▂-1818-1707-1173-1773-2534440019657-12-530NANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▅▇▆▃█▁▂▃▅188727932461103931921266249952025NANANANA
us-gaap:ProfitLoss ▇▆███▁▄▅▅1189984135414101372147774808917NANANANA
us-gaap:DepreciationDepletionAndAmortization ▆████▂▁▁▁693927913914897257162136140NANANANA
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet ▅▁▆▅▆▃▇▇█-144-302-68-106-83-213-21-468NANANANA
us-gaap:IncreaseDecreaseInInventories ▄█▃▄▁▆▄▄▄-96512-137-84-44019131-21-94NANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities █████▁██▇-269-271-304-634475-24704125-99-1700NANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁▁▁▁▁▃█▂▂-1818-1707-1173-1773-2534440019657-12-530NANANANA
us-gaap:ProceedsFromIssuanceOfLongTermDebt █▁34700NANA0297220000NANANANANANA
us-gaap:RepaymentsOfLongTermDebt █▃▂▄▃▁▁▁▁4209115160017401000000131NANANA250
us-gaap:PaymentsForRepurchaseOfCommonStock █▄▆▄▄▁▁▁▃9564476744044623200310NANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:RepaymentsOfLongTermDebt █▃▂▄▃▁▁▁▁4209115160017401000000131NANANA250
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument ci:NotesDue20233Interest▁▁▁▁▁█0.030.030.030.030.030.033NANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument ci:NotesDue203024Interest0.024NANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument ci:NotesDue204032Interest0.032NANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument ci:NotesDue205034Interest0.034NANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:LongtermDebtType ci:A240LongTermDebtDueMarch152030,us-gaap:SeniorNotesNANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:LongtermDebtType ci:A320LongTermDebtDueMarch152040,us-gaap:SeniorNotesNANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:LongtermDebtType ci:A340LongTermDebtDueMarch152050,us-gaap:SeniorNotesNANANANANANANANANANANANANA

Common Stock Value

us-gaap:CommonStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value44444474
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.1

Common Stock Par Or Stated Value Per Share

us-gaap:CommonStockParOrStatedValuePerShare



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value0.010.010.010.010.010.010.25
Percentage of CommonStockParOrStatedValuePerShare100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-31
Value3883863843843843812960
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.00.0

Common Stock Shares Outstanding

Common Stock Shares Authorized

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value374378380384246245245
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value3.192.633.63.733.610.563.183.323.781.092.253.22.34
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value3.152.63.573.73.560.553.143.293.721.072.213.152.3
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value38469382453855638819379461430011457114801141310632103721037410428
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

ci:CorporateAndEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-1445-963-881-828-916-350-413-409-418
Percentage of Revenues-3.8-2.5-2.3-2.1-2.4-2.4-3.6-3.6-3.7
Percentage of Revenues-3.8-2.5-2.3-2.1-2.4-2.4-3.6-3.6-3.7
Percentage of Revenues ci:CorporateAndEliminations100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ci:GroupDisabilityAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value13391293128413091296124612621282
Percentage of Revenues3.53.43.33.43.48.711.011.2
Percentage of Revenues3.53.43.33.43.48.711.011.2
Percentage of Revenues us-gaap:OperatingSegments ci:GroupDisabilityAndOther100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ci:HealthServices



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value27255272602759827987269493772110911131071
Percentage of Revenues70.871.371.672.171.026.49.79.79.4
Percentage of Revenues70.871.371.672.171.026.49.79.79.4
Percentage of Revenues us-gaap:OperatingSegments ci:HealthServices100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value98609208914889689195829781748170
Percentage of Revenues25.624.123.723.124.258.071.371.2
Percentage of Revenues25.624.123.723.124.258.071.371.2
Percentage of Revenues us-gaap:OperatingSegments ci:IntegratedMedical100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ci:InternationalMarkets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value14601447140713831422133513251324
Percentage of Revenues3.83.83.63.63.79.311.611.5
Percentage of Revenues3.83.83.63.63.79.311.611.5
Percentage of Revenues us-gaap:OperatingSegments ci:InternationalMarkets100.0100.0100.0100.0100.0100.0100.0100.0

Premiums Earned Net

us-gaap:PremiumsEarnedNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value10840100059935980399719108899490128999
Percentage of PremiumsEarnedNet100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues28.226.225.825.326.363.778.578.578.8

us-gaap:ProductOrService

ci:DisabilityLifeAccident



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value111610491069104710061009
Percentage of PremiumsEarnedNet10.310.610.910.511.211.2
Percentage of Revenues2.92.72.82.88.88.8
Percentage of Revenues ci:DisabilityLifeAccident0.00.00.00.00.00.0

ci:OtherPremiums



Period End2020-03-312019-03-31
Value2937
Percentage of PremiumsEarnedNet0.30.4
Percentage of Revenues0.10.1
Percentage of Revenues ci:OtherPremiums0.00.0

us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

ci:IntegratedMedicalProducts, ci:IntegratedMedical



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value832075447396758366936685
Percentage of PremiumsEarnedNet76.875.975.476.174.474.2
Percentage of Revenues21.619.619.120.058.458.2
Percentage of Revenues ci:IntegratedMedicalProducts ci:IntegratedMedical0.00.00.00.00.00.0

ci:MedicalRiskProducts, ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value34613245317430653039275926972643
Percentage of PremiumsEarnedNet31.932.431.931.330.530.330.029.3
Percentage of Revenues9.08.58.27.98.019.323.523.0
Percentage of Revenues ci:MedicalRiskProducts ci:IntegratedMedical0.00.00.00.00.00.00.00.0

ci:MedicareAdvantage, ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value18811535156216101607141814551461
Percentage of PremiumsEarnedNet17.415.315.716.416.115.616.216.2
Percentage of Revenues4.94.04.14.14.29.912.712.7
Percentage of Revenues ci:MedicareAdvantage ci:IntegratedMedical0.00.00.00.00.00.00.00.0

ci:MedicarePartD, ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value462370404400525190157189
Percentage of PremiumsEarnedNet4.33.74.14.15.32.11.72.1
Percentage of Revenues1.21.01.01.01.41.31.41.6
Percentage of Revenues ci:MedicarePartD ci:IntegratedMedical0.00.00.00.00.00.00.00.0

ci:OtherCommercialMedicalProducts, ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value289261260241278261260259
Percentage of PremiumsEarnedNet2.72.62.62.52.82.92.92.9
Percentage of Revenues0.80.70.70.60.71.82.32.3
Percentage of Revenues ci:OtherCommercialMedicalProducts ci:IntegratedMedical0.00.00.00.00.00.00.00.0

ci:OtherGovernmentProducts, ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value10661048105910131065114111141140
Percentage of PremiumsEarnedNet9.810.510.710.310.712.512.412.6
Percentage of Revenues2.82.72.72.62.88.09.79.9
Percentage of Revenues ci:OtherGovernmentProducts ci:IntegratedMedical0.00.00.00.00.00.00.00.0

ci:StopLoss, ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1161110710851067106910251010993
Percentage of PremiumsEarnedNet10.711.110.910.910.711.311.211.0
Percentage of Revenues3.02.92.82.72.87.28.88.6
Percentage of Revenues ci:StopLoss ci:IntegratedMedical0.00.00.00.00.00.00.00.0

us-gaap:StatementBusinessSegments

ci:InternationalMarkets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value137513521309130113041276124512621260
Percentage of PremiumsEarnedNet12.713.513.213.313.114.013.814.014.0
Percentage of Revenues3.63.53.43.43.48.910.911.011.0
Percentage of Revenues ci:InternationalMarkets0.00.00.00.00.00.00.00.00.0

Net Investment Income

us-gaap:NetInvestmentIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value353355349340346444355352329
Percentage of NetInvestmentIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.90.90.90.90.93.13.13.12.9

us-gaap:ConsolidationItems

ci:CorporateAndEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0611-10119207
Percentage of NetInvestmentIncome0.01.70.30.3-2.926.85.62.0
Percentage of Revenues0.00.00.00.0-0.00.80.20.1
Percentage of Revenues ci:CorporateAndEliminations-0.0-0.6-0.1-0.11.1-34.0-4.8-1.7

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ci:GroupDisabilityAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value162174170171180174176187
Percentage of NetInvestmentIncome45.949.048.750.352.039.249.653.1
Percentage of Revenues0.40.50.40.40.51.21.51.6
Percentage of Revenues us-gaap:OperatingSegments ci:GroupDisabilityAndOther12.113.513.213.113.914.013.914.6

us-gaap:OperatingSegments, ci:HealthServices



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value25131517154221
Percentage of NetInvestmentIncome7.13.74.35.04.30.90.60.60.3
Percentage of Revenues0.10.00.00.00.00.00.00.00.0
Percentage of Revenues us-gaap:OperatingSegments ci:HealthServices0.10.00.10.10.10.10.20.20.1

us-gaap:OperatingSegments, ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value126120124111123111117120
Percentage of NetInvestmentIncome35.733.835.532.635.525.033.034.1
Percentage of Revenues0.30.30.30.30.30.81.01.0
Percentage of Revenues us-gaap:OperatingSegments ci:IntegratedMedical1.31.31.41.21.31.31.41.5

us-gaap:OperatingSegments, ci:InternationalMarkets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value4042394038364036
Percentage of NetInvestmentIncome11.311.811.211.811.08.111.310.2
Percentage of Revenues0.10.10.10.10.10.30.30.3
Percentage of Revenues us-gaap:OperatingSegments ci:InternationalMarkets2.72.92.82.92.72.73.02.7

Policyholder Benefits And Claims Incurred Net

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value832278897734757676207108680368456772
Percentage of PolicyholderBenefitsAndClaimsIncurredNet100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues21.620.620.119.520.149.759.459.659.3

Deferred Policy Acquisition Cost Amortization Expense

Selling General And Administrative Expense

us-gaap:SellingGeneralAndAdministrativeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value339839573413338033033480287228372745
Percentage of SellingGeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues8.810.38.98.78.724.325.124.724.1

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value139712611763175817882281033110212187588241134890
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues3.63.34.64.54.71.69.09.610.77.17.910.98.5

us-gaap:ConsolidationItems

ci:CorporateAndEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-743-793-556-689-626-683-211-210-153
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest-53.2-62.9-31.5-39.2-35.0-299.6-20.4-19.1-12.6
Percentage of Revenues-1.9-2.1-1.4-1.8-1.6-4.8-1.8-1.8-1.3
Percentage of Revenues ci:CorporateAndEliminations51.482.363.183.268.3195.151.151.336.6

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ci:GroupDisabilityAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value721551591559397135162
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest5.212.39.08.85.242.513.114.7
Percentage of Revenues0.20.40.40.40.20.71.21.4
Percentage of Revenues us-gaap:OperatingSegments ci:GroupDisabilityAndOther5.412.012.411.87.27.810.712.6

us-gaap:OperatingSegments, ci:HealthServices



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value6949689651108942102677783
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest49.776.854.763.052.744.76.57.06.8
Percentage of Revenues1.82.52.52.92.50.70.60.70.7
Percentage of Revenues us-gaap:OperatingSegments ci:HealthServices2.53.63.54.03.52.76.06.97.7

us-gaap:OperatingSegments, ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value114074710119891157622848900
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest81.659.257.356.364.7272.882.181.7
Percentage of Revenues3.02.02.62.53.04.37.47.8
Percentage of Revenues us-gaap:OperatingSegments ci:IntegratedMedical11.68.111.111.012.67.510.411.0

us-gaap:OperatingSegments, ci:InternationalMarkets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value23418418419522290194173
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest16.814.610.411.112.439.518.815.7
Percentage of Revenues0.60.50.50.50.60.61.71.5
Percentage of Revenues us-gaap:OperatingSegments ci:InternationalMarkets16.012.713.114.115.66.714.613.1

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value20827740934841681259294301
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.50.71.10.91.10.62.32.62.6

Assets

us-gaap:Assets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value15471115577415484715440115434815322661759
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value10959011039511011411055211189711215447999
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets70.870.971.171.672.573.277.7

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value15471115577415484715440115434815322661759
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value45079453384469643815424084102813711
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets29.129.128.928.427.526.822.2

us-gaap:StatementEquityComponents

ci:AOCIAccumulatedGainLossDebtSecuritiesAvailableForSaleAndDerivativesParent



Period End2020-03-312019-12-312019-03-312018-12-31
Value54797546018
Percentage of StockholdersEquity1.22.21.10.0
Percentage of Assets0.40.60.30.0
Percentage of Assets ci:AOCIAccumulatedGainLossDebtSecuritiesAvailableForSaleAndDerivativesParent0.00.00.00.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-03-312018-12-31
Value-1628-1641-1497-1508
Percentage of StockholdersEquity-3.6-3.6-3.5-3.7
Percentage of Assets-1.1-1.1-1.0-1.0
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-12-312019-03-312018-12-31
Value-446-275-245-221
Percentage of StockholdersEquity-1.0-0.6-0.6-0.5
Percentage of Assets-0.3-0.2-0.2-0.1
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.0

Assets Current

us-gaap:AssetsCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value3087729845211682070921136204309311
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets20.019.213.713.413.713.315.1

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value4452461945773610497638552403236342771297231851968
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.93.03.02.33.22.50.00.00.04.80.00.0

Short Term Investments

us-gaap:ShortTermInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value97393713711665166220452136
Percentage of ShortTermInvestments100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.60.60.91.11.11.33.5

Receivables Net Current

us-gaap:ReceivablesNetCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value1173510716117191170010941104733155
Percentage of ReceivablesNetCurrent100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.66.97.67.67.16.85.1

Inventory Net

us-gaap:InventoryNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value256526612160229823822821228
Percentage of InventoryNet100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.71.71.41.51.51.80.4

Other Assets Current

us-gaap:OtherAssetsCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value173314001341143611751236820
Percentage of OtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.10.90.90.90.80.81.3

Property Plant And Equipment Gross

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

Property Plant And Equipment Net

Long Term Investments

us-gaap:LongTermInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value20608215422890428180272572692926483
Percentage of LongTermInvestments100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets13.313.818.718.317.717.642.9

us-gaap:FinancialInstrument, ci:InvestmentsByConsolidatedAndNonconsolidatedEntities

ci:SecuritiesLimitedPartnershipsAndRealEstateLimitedPartnerships, us-gaap:VariableInterestEntityNotPrimaryBeneficiary



Period End2020-03-31
Value1900
Percentage of LongTermInvestments9.2
Percentage of Assets1.2
Percentage of Assets ci:SecuritiesLimitedPartnershipsAndRealEstateLimitedPartnerships us-gaap:VariableInterestEntityNotPrimaryBeneficiary0.0

Goodwill

us-gaap:Goodwill



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-31
Value44584446024446244449445374450561645980
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets28.828.628.728.828.929.010.00.0

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value361623656237084377173833839003345
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets23.423.523.924.424.825.50.6

Finite Lived Intangible Assets Net

Deferred Tax Assets Liabilities Net

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value2517228323792318227616301431
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.61.51.51.51.51.12.3

Liabilities Current

us-gaap:LiabilitiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value40380401383444731867329693189511009
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets26.125.822.220.621.420.817.8

Debt Current

us-gaap:DebtCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value434055144712231029152955240
Percentage of DebtCurrent100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.83.53.01.51.91.90.4

Long Term Debt Current

us-gaap:DebtInstrument

us-gaap:LongTermDebtCurrent

ci:NotesDue202026Interest



Period End2020-03-312019-12-312018-12-31
Value4974960
Percentage of LongTermDebtCurrent100.0100.00.0
Percentage of Assets0.30.30.0
Percentage of Assets ci:NotesDue202026Interest0.00.00.0

ci:NotesDue202032Interest



Period End2020-03-312019-12-312019-09-302018-12-31
Value1748174817480
Percentage of LongTermDebtCurrent351.7352.40.00.0
Percentage of Assets1.11.11.10.0
Percentage of Assets ci:NotesDue202032Interest0.00.00.00.0

ci:NotesDue20204125Interest



Period End2020-03-312019-12-312019-09-302018-12-31
Value3513515030
Percentage of LongTermDebtCurrent70.670.80.00.0
Percentage of Assets0.20.20.30.0
Percentage of Assets ci:NotesDue20204125Interest0.00.00.00.0

ci:NotesDue20204375Interest



Period End2020-03-312019-12-312018-12-31
Value2492490
Percentage of LongTermDebtCurrent50.150.20.0
Percentage of Assets0.20.20.0
Percentage of Assets ci:NotesDue20204375Interest0.00.00.0

ci:NotesDue20205125Interest



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value3003003003000
Percentage of LongTermDebtCurrent60.460.50.00.00.0
Percentage of Assets0.20.20.20.20.0
Percentage of Assets ci:NotesDue20205125Interest0.00.00.00.00.0

ci:NotesDue2020FloatingRateInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value09999989989980
Percentage of LongTermDebtCurrent0.0201.40.00.00.00.0
Percentage of Assets0.00.60.60.60.60.0
Percentage of Assets ci:NotesDue2020FloatingRateInterest0.00.00.00.00.00.0

ci:NotesDue2020FloatingRateInterestExpressScripts



Period End2020-03-312019-12-312018-12-31
Value4004000
Percentage of LongTermDebtCurrent80.580.60.0
Percentage of Assets0.30.30.0
Percentage of Assets ci:NotesDue2020FloatingRateInterestExpressScripts0.00.00.0

Accounts Payable Current

us-gaap:AccountsPayableCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value558550904502451744884366184
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.63.32.92.92.92.80.3

Other Liabilities Current

Long Term Debt Noncurrent

us-gaap:DebtInstrument

us-gaap:LongTermDebtNoncurrent

ci:NotesDue202133Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value0499499499499499
Percentage of LongTermDebtNoncurrent0.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.30.30.30.30.3
Percentage of Assets ci:NotesDue202133Interest0.00.00.00.00.00.0

ci:NotesDue202134Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value124712471246124612461245
Percentage of LongTermDebtNoncurrent0.0249.9249.7249.7249.7249.5
Percentage of Assets0.80.80.80.80.80.8
Percentage of Assets ci:NotesDue202134Interest0.00.00.00.00.00.0

ci:NotesDue202145Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value0298298297297297
Percentage of LongTermDebtNoncurrent0.059.759.759.559.559.5
Percentage of Assets0.00.20.20.20.20.2
Percentage of Assets ci:NotesDue202145Interest0.00.00.00.00.00.0

ci:NotesDue2021475Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value29212721276127912821285
Percentage of LongTermDebtNoncurrent0.0254.9255.7256.3256.9257.5
Percentage of Assets0.20.80.80.80.80.8
Percentage of Assets ci:NotesDue2021475Interest0.00.00.00.00.00.0

ci:NotesDue2021FloatingRateInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value998998997997997996
Percentage of LongTermDebtNoncurrent0.0200.0199.8199.8199.8199.6
Percentage of Assets0.60.60.60.60.60.7
Percentage of Assets ci:NotesDue2021FloatingRateInterest0.00.00.00.00.00.0

ci:NotesDue2022305Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value487485485483482481
Percentage of LongTermDebtNoncurrent0.097.297.296.896.696.4
Percentage of Assets0.30.30.30.30.30.3
Percentage of Assets ci:NotesDue2022305Interest0.00.00.00.00.00.0

ci:NotesDue202239Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value972999999999998998
Percentage of LongTermDebtNoncurrent0.0200.2200.2200.2200.0200.0
Percentage of Assets0.60.60.60.60.60.7
Percentage of Assets ci:NotesDue202239Interest0.00.00.00.00.00.0

ci:NotesDue20224Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value276747747746746746
Percentage of LongTermDebtNoncurrent0.0149.7149.7149.5149.5149.5
Percentage of Assets0.20.50.50.50.50.5
Percentage of Assets ci:NotesDue20224Interest0.00.00.00.00.00.0

ci:NotesDue2023375Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value217930883087308730853085
Percentage of LongTermDebtNoncurrent0.0618.8618.6618.6618.2618.2
Percentage of Assets1.42.02.02.02.02.0
Percentage of Assets ci:NotesDue2023375Interest0.00.00.00.00.00.0

ci:NotesDue20233Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value969966965963961959
Percentage of LongTermDebtNoncurrent0.0193.6193.4193.0192.6192.2
Percentage of Assets0.60.60.60.60.60.6
Percentage of Assets ci:NotesDue20233Interest0.00.00.00.00.00.0

ci:NotesDue2023765Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value63100100100100100
Percentage of LongTermDebtNoncurrent0.020.020.020.020.020.0
Percentage of Assets0.00.10.10.10.10.1
Percentage of Assets ci:NotesDue2023765Interest0.00.00.00.00.00.0

ci:NotesDue2023FloatingRateInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value698698698697697697
Percentage of LongTermDebtNoncurrent0.0139.9139.9139.7139.7139.7
Percentage of Assets0.50.40.50.50.50.5
Percentage of Assets ci:NotesDue2023FloatingRateInterest0.00.00.00.00.00.0

ci:NotesDue202435Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value973970970969968966
Percentage of LongTermDebtNoncurrent0.0194.4194.4194.2194.0193.6
Percentage of Assets0.60.60.60.60.60.6
Percentage of Assets ci:NotesDue202435Interest0.00.00.00.00.00.0

ci:NotesDue20254125Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value218921882188218821872187
Percentage of LongTermDebtNoncurrent0.0438.5438.5438.5438.3438.3
Percentage of Assets1.41.41.41.41.41.4
Percentage of Assets ci:NotesDue20254125Interest0.00.00.00.00.00.0

ci:NotesDue202645Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value150515061507150715071508
Percentage of LongTermDebtNoncurrent0.0301.8302.0302.0302.0302.2
Percentage of Assets1.01.01.01.01.01.0
Percentage of Assets ci:NotesDue202645Interest0.00.00.00.00.00.0

ci:NotesDue202734Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value140013961396139213901386
Percentage of LongTermDebtNoncurrent0.0279.8279.8279.0278.6277.8
Percentage of Assets0.90.90.90.90.90.9
Percentage of Assets ci:NotesDue202734Interest0.00.00.00.00.00.0

ci:NotesDue20284375Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value377737763775377537743774
Percentage of LongTermDebtNoncurrent0.0756.7756.5756.5756.3756.3
Percentage of Assets2.42.42.42.42.42.5
Percentage of Assets ci:NotesDue20284375Interest0.00.00.00.00.00.0

ci:NotesDue203024Interest



Period End2020-03-312019-12-31
Value14880
Percentage of LongTermDebtNoncurrent0.00.0
Percentage of Assets1.00.0
Percentage of Assets ci:NotesDue203024Interest0.00.0

ci:NotesDue203848Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value217921782178217821782178
Percentage of LongTermDebtNoncurrent0.0436.5436.5436.5436.5436.5
Percentage of Assets1.41.41.41.41.41.4
Percentage of Assets ci:NotesDue203848Interest0.00.00.00.00.00.0

ci:NotesDue204032Interest



Period End2020-03-312019-12-31
Value7420
Percentage of LongTermDebtNoncurrent0.00.0
Percentage of Assets0.50.0
Percentage of Assets ci:NotesDue204032Interest0.00.0

ci:NotesDue20416125Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value490491492492493493
Percentage of LongTermDebtNoncurrent0.098.498.698.698.898.8
Percentage of Assets0.30.30.30.30.30.3
Percentage of Assets ci:NotesDue20416125Interest0.00.00.00.00.00.0

ci:NotesDue204648Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value146414651465146514651465
Percentage of LongTermDebtNoncurrent0.0293.6293.6293.6293.6293.6
Percentage of Assets0.90.90.90.90.91.0
Percentage of Assets ci:NotesDue204648Interest0.00.00.00.00.00.0

ci:NotesDue204849Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value296529642964296429642964
Percentage of LongTermDebtNoncurrent0.0594.0594.0594.0594.0594.0
Percentage of Assets1.91.91.91.91.91.9
Percentage of Assets ci:NotesDue204849Interest0.00.00.00.00.00.0

ci:NotesDue205034Interest



Period End2020-03-312019-12-31
Value12350
Percentage of LongTermDebtNoncurrent0.00.0
Percentage of Assets0.80.0
Percentage of Assets ci:NotesDue205034Interest0.00.0

Deferred Tax Liabilities Noncurrent

Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent

Minority Interest

us-gaap:MinorityInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value7633570
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.00.00.00.00.00.00.0

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value4519446039193930383234702838
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.92.92.52.52.52.34.6

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value45079453384469643815424084102813711
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets29.129.128.928.427.526.822.2

us-gaap:StatementEquityComponents

ci:AOCIAccumulatedGainLossDebtSecuritiesAvailableForSaleAndDerivativesParent



Period End2020-03-312019-12-312019-03-312018-12-31
Value54797546018
Percentage of StockholdersEquity1.22.21.10.0
Percentage of Assets0.40.60.30.0
Percentage of Assets ci:AOCIAccumulatedGainLossDebtSecuritiesAvailableForSaleAndDerivativesParent0.00.00.00.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-03-312018-12-31
Value-1628-1641-1497-1508
Percentage of StockholdersEquity-3.6-3.6-3.5-3.7
Percentage of Assets-1.1-1.1-1.0-1.0
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-12-312019-03-312018-12-31
Value-446-275-245-221
Percentage of StockholdersEquity-1.0-0.6-0.6-0.5
Percentage of Assets-0.3-0.2-0.2-0.1
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value44444474
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.1

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value21298201621918517834164261508815800
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets13.812.912.411.610.69.825.6

Treasury Stock Value

us-gaap:TreasuryStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value3250219317509495951044021
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.11.41.10.60.40.16.5

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value-1527-941-858-965-1282-1711-1082
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-1.0-0.6-0.6-0.6-0.8-1.1-1.8

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value188727932461103931921266249952025
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues4.97.36.42.78.40.95.48.717.7

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-269-271-304-634475-24704125-99-1700
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-0.7-0.7-0.8-1.61.3-172.81.1-0.9-14.9

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-1818-1707-1173-1773-2534440019657-12-530
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-4.7-4.5-3.0-4.6-6.730.8171.6-0.1-4.6

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value188727932461103931921266249952025
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues4.97.36.42.78.40.95.48.717.7

Profit Loss

us-gaap:ProfitLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1189984135414101372147774808917
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value693927913914897257162136140
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-144-302-68-106-83-213-21-468
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Inventories

us-gaap:IncreaseDecreaseInInventories



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-96512-137-84-44019131-21-94
Percentage of IncreaseDecreaseInInventories100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-269-271-304-634475-24704125-99-1700
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-0.7-0.7-0.8-1.61.3-172.81.1-0.9-14.9

Payments To Acquire Property Plant And Equipment

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-1818-1707-1173-1773-2534440019657-12-530
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-4.7-4.5-3.0-4.6-6.730.8171.6-0.1-4.6

Proceeds From Issuance Of Long Term Debt

us-gaap:ProceedsFromIssuanceOfLongTermDebt



Period End2020-03-312019-12-312019-03-312018-12-312018-09-30
Value347000297220000
Percentage of ProceedsFromIssuanceOfLongTermDebt100.00.00.0100.0100.0

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-03-31
Value4209115160017401000000131250
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.00.00.00.0100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value9564476744044623200310
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.0100.0100.0100.00.00.0100.0

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-03-31
Value4209115160017401000000131250
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.00.00.00.0100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.0

Debt Instrument Interest Rate Stated Percentage

us-gaap:DebtInstrument

us-gaap:DebtInstrumentInterestRateStatedPercentage

ci:NotesDue20233Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value0.030.030.030.030.030.033
Percentage of DebtInstrumentInterestRateStatedPercentage100.0100.0100.0100.0100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations ci:NotesDue20233Interest0.00.00.00.00.00.0

ci:NotesDue203024Interest



Period End2020-03-31
Value0.024
Percentage of DebtInstrumentInterestRateStatedPercentage80.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations ci:NotesDue203024Interest0.0

ci:NotesDue204032Interest



Period End2020-03-31
Value0.032
Percentage of DebtInstrumentInterestRateStatedPercentage106.7
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations ci:NotesDue204032Interest0.0

ci:NotesDue205034Interest



Period End2020-03-31
Value0.034
Percentage of DebtInstrumentInterestRateStatedPercentage113.3
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations ci:NotesDue205034Interest0.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

ci:A240LongTermDebtDueMarch152030, us-gaap:SeniorNotes



Period End2020-03-16
Value0.024
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations ci:A240LongTermDebtDueMarch152030 us-gaap:SeniorNotes0.0

ci:A320LongTermDebtDueMarch152040, us-gaap:SeniorNotes



Period End2020-03-16
Value0.032
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations ci:A320LongTermDebtDueMarch152040 us-gaap:SeniorNotes0.0

ci:A340LongTermDebtDueMarch152050, us-gaap:SeniorNotes



Period End2020-03-16
Value0.034
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations ci:A340LongTermDebtDueMarch152050 us-gaap:SeniorNotes0.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.1490.00.006000000000000005-0.0180000000000000160.2330.006000000000000005-0.00100000000000000090.0090000000000000080.247
Percentage of EffectiveIncomeTaxRateContinuingOperations100.00.0100.0100.0100.0100.0100.0100.0100.0

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

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

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

Deferred Tax Liabilities

Deferred Tax Assets Net

Unrecognized Tax Benefits

Deferred Tax Assets Valuation Allowance

Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset



Period End2020-03-312019-12-31
Value514536
Percentage of OperatingLeaseRightOfUseAsset100.0100.0

Cash And Cash Equivalents Period Increase Decrease

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents



Period End2020-03-312019-12-312019-03-312018-12-312017-12-31
Value45774668497638552972
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0

Proceeds From Repayments Of Short Term Debt

us-gaap:ProceedsFromRepaymentsOfShortTermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-180-202142427-10481596-104-2-3
Percentage of ProceedsFromRepaymentsOfShortTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0

ci:AdjustedIncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value22352096224720551964877125412761336
Percentage of AdjustedIncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

ci:CorporateAndEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-405-439-442-453-490-148-83-80-92
Percentage of AdjustedIncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest-18.1-20.9-19.7-22.0-24.9-16.9-6.6-6.3-6.9

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ci:GroupDisabilityAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value7712514314984109143161
Percentage of AdjustedIncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest3.46.06.47.34.312.411.412.6

us-gaap:OperatingSegments, ci:HealthServices



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1082153713991162994153677783
Percentage of AdjustedIncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest48.473.362.356.550.617.45.36.06.2

us-gaap:OperatingSegments, ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value11997189539901170643932915
Percentage of AdjustedIncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest53.634.342.448.259.673.374.371.7

us-gaap:OperatingSegments, ci:InternationalMarkets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value282155194207206120195203
Percentage of AdjustedIncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest12.67.48.610.110.513.715.615.9

ci:ComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterestIncludingTemporaryEquity



Period End2020-03-312019-03-31
Value5991799
Percentage of ComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterestIncludingTemporaryEquity100.0100.0

ci:EarningsPerShareEffectOfDilution



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-0.04-0.030000000000000013-0.03-0.03-0.05-0.009999999999999981-0.04-0.03-0.06
Percentage of EarningsPerShareEffectOfDilution100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByAssetClass

ci:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossAttributedToInstrumentsHeldIncludedInEarnings

ci:DebtAndEquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-180-6-1-10-1-1-7
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossAttributedToInstrumentsHeldIncludedInEarnings100.00.0100.0100.0100.00.0100.0100.0100.0

us-gaap:FairValueByAssetClass

ci:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossRequiredToAdjustFuturePolicyBenefits

ci:DebtAndEquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-10-11020-2-2-4
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossRequiredToAdjustFuturePolicyBenefits100.0100.0100.00.0100.00.0100.0100.0100.0

us-gaap:Range, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

ci:FinancingReceivableCreditQualityDebtServiceCoverageBeforeReclassificationToDisposalGroupAssetsHeldForSale

srt:WeightedAverage, us-gaap:CommercialPortfolioSegment, us-gaap:RealEstateLoan



Period End2020-03-31
Value2.09
Percentage of FinancingReceivableCreditQualityDebtServiceCoverageBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0

us-gaap:Range, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:LoanToValue

srt:WeightedAverage, us-gaap:CommercialPortfolioSegment, us-gaap:RealEstateLoan, ci:Ltv60To79Percent



Period End2020-03-31
Value1.98
Percentage of FinancingReceivableCreditQualityDebtServiceCoverageBeforeReclassificationToDisposalGroupAssetsHeldForSale94.7

srt:WeightedAverage, us-gaap:CommercialPortfolioSegment, us-gaap:RealEstateLoan, ci:LtvLessThan60Percent



Period End2020-03-31
Value2.19
Percentage of FinancingReceivableCreditQualityDebtServiceCoverageBeforeReclassificationToDisposalGroupAssetsHeldForSale104.8

srt:WeightedAverage, us-gaap:CommercialPortfolioSegment, us-gaap:RealEstateLoan, us-gaap:Ltv80To100Percent



Period End2020-03-31
Value1.62
Percentage of FinancingReceivableCreditQualityDebtServiceCoverageBeforeReclassificationToDisposalGroupAssetsHeldForSale77.5

us-gaap:Range, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

ci:FinancingReceivableCreditQualityLoanToValueRatioBeforeReclassificationToDisposalGroupAssetsHeldForSale

srt:WeightedAverage, us-gaap:CommercialPortfolioSegment, us-gaap:RealEstateLoan



Period End2020-03-31
Value0.58
Percentage of FinancingReceivableCreditQualityLoanToValueRatioBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0

us-gaap:ProductOrService, us-gaap:GuaranteedInsuranceContractTypeOfBenefit

ci:GuaranteedMinimumDeathBenefitsTotalContractholders

us-gaap:VariableAnnuity, us-gaap:GuaranteedMinimumDeathBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value195000.0-5000.0-5000.0-5000.0215000.0
Percentage of GuaranteedMinimumDeathBenefitsTotalContractholders100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

ci:ImpactOfPriorYearDevelopmentOnPretaxIncome

ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value78-1828508182051
Percentage of ImpactOfPriorYearDevelopmentOnPretaxIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

ci:ImpactOfPriorYearDevelopmentOnShareholdersNetIncome

ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value62-1623397141640
Percentage of ImpactOfPriorYearDevelopmentOnShareholdersNetIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0

ci:ImpairmentsOnInvestmentsTotal



Period End2020-03-312019-03-31
Value91
Percentage of ImpairmentsOnInvestmentsTotal100.0100.0

ci:IncomeLossAttributableToNoncontrollingInterestBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value974454334
Percentage of IncomeLossAttributableToNoncontrollingInterestBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ci:HealthServices



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value430010000
Percentage of IncomeLossAttributableToNoncontrollingInterestBeforeTax44.442.90.00.020.00.00.00.00.0

us-gaap:OperatingSegments, ci:InternationalMarkets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value54444433
Percentage of IncomeLossAttributableToNoncontrollingInterestBeforeTax55.657.1100.0100.080.0100.0100.0100.0

ci:IncreaseDecreaseInAccountsPayableAccruedAndOtherOperatingLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3081320393-46191155298-314193
Percentage of IncreaseDecreaseInAccountsPayableAccruedAndOtherOperatingLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0

ci:IncreaseDecreaseInPharmacyAndServiceCostsPayable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value408-402-503269444-8516469-124
Percentage of IncreaseDecreaseInPharmacyAndServiceCostsPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoncatastrophicEvent, us-gaap:StatementBusinessSegments

ci:LiabilityForUnpaidMedicalClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYearsPercentage

ci:CompletionFactors, ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.0030.00.00.0020.0020.0010.001
Percentage of LiabilityForUnpaidMedicalClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYearsPercentage100.00.00.0100.0100.0100.0100.0

ci:MedicalCostTrend, ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.0030.0010.00.00.0030.00.0
Percentage of LiabilityForUnpaidMedicalClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYearsPercentage100.00.00.00.0150.00.00.0

us-gaap:StatementBusinessSegments

ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.0060.0010.00.0020.0050.00099999999999999920.0010.0010.006
Percentage of LiabilityForUnpaidMedicalClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYearsPercentage200.00.00.0100.0250.0100.0100.00.00.0

ci:NonInvestmentRevenue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value381163789038207384793760013856111021112811084
Percentage of NonInvestmentRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-1445-969-882-829-906-469-433-416-423
Percentage of NonInvestmentRevenue-3.8-2.6-2.3-2.2-2.4-3.4-3.9-3.7-3.8

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:IntersegmentElimination, ci:GroupDisabilityAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value5-5-7-77-4-4-3
Percentage of NonInvestmentRevenue0.0-0.0-0.0-0.00.0-0.0-0.0-0.0

us-gaap:IntersegmentElimination, ci:HealthServices



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value974-511-499-633737-313-279-278
Percentage of NonInvestmentRevenue2.6-1.3-1.3-1.62.0-2.3-2.5-2.5

us-gaap:IntersegmentElimination, ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value466-453-376-189162-152-150-135
Percentage of NonInvestmentRevenue1.2-1.2-1.0-0.50.4-1.1-1.4-1.2

us-gaap:OperatingSegments, ci:GroupDisabilityAndOther



Period End2020-03-312019-03-31
Value11721109
Percentage of NonInvestmentRevenue3.12.9

us-gaap:OperatingSegments, ci:HealthServices



Period End2020-03-312019-03-31
Value2625626197
Percentage of NonInvestmentRevenue68.969.7

us-gaap:OperatingSegments, ci:IntegratedMedical



Period End2020-03-312019-03-31
Value92688910
Percentage of NonInvestmentRevenue24.323.7

us-gaap:OperatingSegments, ci:InternationalMarkets



Period End2020-03-312019-03-31
Value14201384
Percentage of NonInvestmentRevenue3.73.7

ci:NoncontrollingInterestOtherChanges



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-3-10-2-30000
Percentage of NoncontrollingInterestOtherChanges100.0100.00.0100.0100.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value-3-10-2-3
Percentage of NoncontrollingInterestOtherChanges100.0100.00.0100.0100.0

ci:OrganizationalEfficiencyPlanCharges



Period End2020-03-312019-12-312019-03-31
Value312070
Percentage of OrganizationalEfficiencyPlanCharges100.0100.00.0

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment



Period End2020-03-31
Value31
Percentage of OrganizationalEfficiencyPlanCharges100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ci:GroupDisabilityAndOther



Period End2020-03-31
Value0.0
Percentage of OrganizationalEfficiencyPlanCharges0.0

us-gaap:OperatingSegments, ci:HealthServices



Period End2020-03-31
Value0.0
Percentage of OrganizationalEfficiencyPlanCharges0.0

us-gaap:OperatingSegments, ci:IntegratedMedical



Period End2020-03-31
Value0.0
Percentage of OrganizationalEfficiencyPlanCharges0.0

us-gaap:OperatingSegments, ci:InternationalMarkets



Period End2020-03-31
Value0.0
Percentage of OrganizationalEfficiencyPlanCharges0.0

ci:OrganizationalEfficiencyPlanChargesNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value24162000
Percentage of OrganizationalEfficiencyPlanChargesNetOfTax100.0100.00.00.00.0

ci:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAndDerivativesAdjustmentNetOfTax



Period End2020-03-312019-03-31
Value-428442
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAndDerivativesAdjustmentNetOfTax100.0100.0

us-gaap:StatementEquityComponents

ci:OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTaxIncludingTemporaryEquity

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-03-31
Value-160-25
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTaxIncludingTemporaryEquity100.0100.0

us-gaap:StatementEquityComponents

ci:OtherComprehensiveIncomeLossBeforeReclassificationsTaxIncludingTemporaryEquity

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-03-31
Value151
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTaxIncludingTemporaryEquity100.0100.0

ci:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxIncludingTemporaryEquity



Period End2020-03-312019-03-31
Value-175-26
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxIncludingTemporaryEquity100.0100.0

ci:OtherComprehensiveIncomeLossNetOfTaxIncludingTemporaryEquity



Period End2020-03-312019-03-31
Value-590427
Percentage of OtherComprehensiveIncomeLossNetOfTaxIncludingTemporaryEquity100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-03-31
Value-175-26
Percentage of OtherComprehensiveIncomeLossNetOfTaxIncludingTemporaryEquity29.7-6.1

ci:PaymentsForProceedsFromPropertyPlantAndEquipment



Period End2020-03-312019-03-31
Value267194
Percentage of PaymentsForProceedsFromPropertyPlantAndEquipment100.0100.0

ci:PaymentsToAcquireDebtAndEquitySecurities



Period End2020-03-312019-03-31
Value11741088
Percentage of PaymentsToAcquireDebtAndEquitySecurities100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

ci:ProceedsFromIssuanceOfLongTermDebtNetOfDiscountsAndUnderwritingFees

ci:A240LongTermDebtDueMarch152030, us-gaap:SeniorNotes



Period End2020-03-16
Value1491
Percentage of ProceedsFromIssuanceOfLongTermDebtNetOfDiscountsAndUnderwritingFees100.0

ci:A320LongTermDebtDueMarch152040, us-gaap:SeniorNotes



Period End2020-03-16
Value743
Percentage of ProceedsFromIssuanceOfLongTermDebtNetOfDiscountsAndUnderwritingFees49.8

ci:A340LongTermDebtDueMarch152050, us-gaap:SeniorNotes



Period End2020-03-16
Value1237
Percentage of ProceedsFromIssuanceOfLongTermDebtNetOfDiscountsAndUnderwritingFees83.0

ci:ProceedsFromMaturitiesPrepaymentsAndCallsOfDebtAndEquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value408544543419319757507590297
Percentage of ProceedsFromMaturitiesPrepaymentsAndCallsOfDebtAndEquitySecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0

ci:ProceedsFromSaleOfDebtAndEquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value7568486035651471725657774499
Percentage of ProceedsFromSaleOfDebtAndEquitySecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0

ci:RealizedInvestmentGainLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-8893512310-450-3-33
Percentage of RealizedInvestmentGainLoss100.0100.0100.0100.0100.0100.00.0100.0100.0

ci:RealizedInvestmentGainLossExcludingImpairments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-2493602511-2103-16
Percentage of RealizedInvestmentGainLossExcludingImpairments100.0100.0100.0100.0100.0100.00.0100.0100.0

ci:RealizedInvestmentGainLossIncludingEquityMethodSubsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-98110561738-65-1-23-35
Percentage of RealizedInvestmentGainLossIncludingEquityMethodSubsidiaries100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ci:GroupDisabilityAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-43018810-11-53
Percentage of RealizedInvestmentGainLossIncludingEquityMethodSubsidiaries4.127.332.147.126.316.9500.0-13.0

us-gaap:OperatingSegments, ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-484743175-2433
Percentage of RealizedInvestmentGainLossIncludingEquityMethodSubsidiaries49.042.776.8100.013.236.9-300.0-13.0

us-gaap:OperatingSegments, ci:InternationalMarkets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-4633-5-823-291-29
Percentage of RealizedInvestmentGainLossIncludingEquityMethodSubsidiaries46.930.0-8.9-47.160.544.6-100.0126.1

ci:RealizedInvestmentGainsLossesEquityMethodInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-10175-628-20-1-20-2
Percentage of RealizedInvestmentGainsLossesEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ci:InternationalMarkets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-10175-628-20-1-20
Percentage of RealizedInvestmentGainsLossesEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0

ci:SegmentRevenues



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3839236538358333437533429-82471114451150011415
Percentage of SegmentRevenues100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

ci:CorporateAndEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-1445-963-881-828-916-460-426-409-418
Percentage of SegmentRevenues-3.8-2.6-2.5-2.4-2.70.6-3.7-3.6-3.7

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ci:GroupDisabilityAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value13391293128413091296124612621282
Percentage of SegmentRevenues3.53.53.63.83.9-1.511.011.1

us-gaap:OperatingSegments, ci:HealthServices



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value27168255702488023537224603313110911131071
Percentage of SegmentRevenues70.870.069.468.567.2-4.09.79.79.4

us-gaap:OperatingSegments, ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value98609208914889689195829781748170
Percentage of SegmentRevenues25.725.225.526.127.5-10.171.471.0

us-gaap:OperatingSegments, ci:InternationalMarkets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value14701430140213891394135513261344
Percentage of SegmentRevenues3.83.93.94.04.2-1.611.611.7

ci:SpecialItemChargeAfterTaxLitigation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value190-23640-163500
Percentage of SpecialItemChargeAfterTaxLitigation100.00.0100.0100.00.0100.0100.00.00.0

ci:SpecialItemChargeBeforetaxLitigation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value250-30810-20450
Percentage of SpecialItemChargeBeforetaxLitigation100.00.0100.0100.00.0100.0100.00.0

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment



Period End2020-03-31
Value25
Percentage of SpecialItemChargeBeforetaxLitigation100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312018-09-30
Value00-300-2045
Percentage of SpecialItemChargeBeforetaxLitigation0.00.0100.00.0100.0100.0

ci:SpecialItemChargesDebtExtinguishmentCostsBeforeTax



Period End2020-03-312019-03-31
Value1850
Percentage of SpecialItemChargesDebtExtinguishmentCostsBeforeTax100.00.0

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment



Period End2020-03-31
Value185
Percentage of SpecialItemChargesDebtExtinguishmentCostsBeforeTax100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ci:GroupDisabilityAndOther



Period End2020-03-31
Value0.0
Percentage of SpecialItemChargesDebtExtinguishmentCostsBeforeTax0.0

us-gaap:OperatingSegments, ci:HealthServices



Period End2020-03-31
Value0.0
Percentage of SpecialItemChargesDebtExtinguishmentCostsBeforeTax0.0

us-gaap:OperatingSegments, ci:IntegratedMedical



Period End2020-03-31
Value0.0
Percentage of SpecialItemChargesDebtExtinguishmentCostsBeforeTax0.0

us-gaap:OperatingSegments, ci:InternationalMarkets



Period End2020-03-31
Value0.0
Percentage of SpecialItemChargesDebtExtinguishmentCostsBeforeTax0.0

ci:SpecialItemChargesDebtExtinguishmentCostsNetOfTax



Period End2020-03-312019-03-31
Value1400
Percentage of SpecialItemChargesDebtExtinguishmentCostsNetOfTax100.00.0

ci:SpecialItemGainLossFromContractAdjustmentBeforeTaxes



Period End2020-03-312019-03-31
Value870
Percentage of SpecialItemGainLossFromContractAdjustmentBeforeTaxes100.00.0

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment



Period End2020-03-31
Value0.0
Percentage of SpecialItemGainLossFromContractAdjustmentBeforeTaxes0.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ci:GroupDisabilityAndOther



Period End2020-03-31
Value0.0
Percentage of SpecialItemGainLossFromContractAdjustmentBeforeTaxes0.0

us-gaap:OperatingSegments, ci:HealthServices



Period End2020-03-31
Value87
Percentage of SpecialItemGainLossFromContractAdjustmentBeforeTaxes100.0

us-gaap:OperatingSegments, ci:IntegratedMedical



Period End2020-03-31
Value0.0
Percentage of SpecialItemGainLossFromContractAdjustmentBeforeTaxes0.0

us-gaap:OperatingSegments, ci:InternationalMarkets



Period End2020-03-31
Value0.0
Percentage of SpecialItemGainLossFromContractAdjustmentBeforeTaxes0.0

ci:SpecialItemGainLossFromContractAdjustmentNetOfTax



Period End2020-03-312019-03-31
Value660
Percentage of SpecialItemGainLossFromContractAdjustmentNetOfTax100.00.0

ci:SpecialItemGainOrLossBeforeTaxAttributableToReportngEntity



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value-251-84-236-136-175-130
Percentage of SpecialItemGainOrLossBeforeTaxAttributableToReportngEntity100.0100.0100.0100.0100.0100.0

ci:SpecialItemGainOrLossNetOfTaxAttributableToReportngEntity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-191-278-65-179-108-389-138-109-50-221-21547-132
Percentage of SpecialItemGainOrLossNetOfTaxAttributableToReportngEntity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ci:SpecialItemsIncreaseDecreaseToRevenues



Period End2020-03-31
Value-87
Percentage of SpecialItemsIncreaseDecreaseToRevenues100.0

us-gaap:ConsolidationItems

ci:CorporateAndEliminations



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

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ci:GroupDisabilityAndOther



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

us-gaap:OperatingSegments, ci:HealthServices



Period End2020-03-31
Value-87
Percentage of SpecialItemsIncreaseDecreaseToRevenues100.0

us-gaap:OperatingSegments, ci:IntegratedMedical



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

us-gaap:OperatingSegments, ci:InternationalMarkets



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

us-gaap:StatementBusinessSegments

ci:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpenseLessInterestAccretion

ci:InternationalMarketsGroupDisabilityAndLife



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4619-17-10-3214-72-28-61
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpenseLessInterestAccretion100.0100.0100.0100.0100.0100.0100.0100.0100.0

ci:TemporaryEquityOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-4-21-2-24-9-8-2
Percentage of TemporaryEquityOtherComprehensiveIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-03-31
Value-4-2
Percentage of TemporaryEquityOtherComprehensiveIncome100.0100.0

ci:TransactionRelatedCosts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value9714711415513653412813060
Percentage of TransactionRelatedCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment



Period End2020-03-312019-03-31
Value97136
Percentage of TransactionRelatedCosts100.0100.0

ci:TransactionRelatedCostsAfterTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value741168811510840210810950256-4749
Percentage of TransactionRelatedCostsAfterTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdditionsToContractHoldersFunds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value267224233251247224242282292
Percentage of AdditionsToContractHoldersFunds100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AmortizationOfIntangibleAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value498735734737743136482427
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ci:GroupDisabilityAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value10221112
Percentage of AmortizationOfIntangibleAssets0.20.00.30.30.10.72.18.3

us-gaap:OperatingSegments, ci:HealthServices



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value479709708709713113000
Percentage of AmortizationOfIntangibleAssets96.296.596.596.296.083.10.00.00.0

us-gaap:OperatingSegments, ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1118151818174218
Percentage of AmortizationOfIntangibleAssets2.22.42.02.42.412.587.575.0

us-gaap:OperatingSegments, ci:InternationalMarkets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value789811554
Percentage of AmortizationOfIntangibleAssets1.41.11.21.11.53.710.416.7

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EmployeeStockOption



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value435200
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.0100.0

us-gaap:BenefitsLossesAndExpenses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value364083668436433366563571613741103251031910105
Percentage of BenefitsLossesAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-237834967-13661121-2017720398863-201
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CededPremiumsEarned



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value128124126130113132135
Percentage of CededPremiumsEarned100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockDividendsPerShareDeclared



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.040.00.00.00.040.00.00.00.040.00.00.00.04
Percentage of CommonStockDividendsPerShareDeclared100.00.00.00.0100.00.00.00.0100.00.00.00.0100.0

us-gaap:ComprehensiveIncomeNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value595894145817251797290758510689
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value454027-7-60
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest100.0100.0100.00.0100.0100.0100.0100.00.0

us-gaap:CededCreditRisk, us-gaap:CededCreditRiskCollateralization, us-gaap:ConcentrationRiskByBenchmark, us-gaap:GuaranteedInsuranceContractTypeOfBenefit

us-gaap:ConcentrationRiskPercentage1

ci:BerkshireHathwayLifeInsuranceCompanyOfNebraska, us-gaap:CededCreditRiskSecured, ci:GuaranteedMinimumIncomeBenefitsAssets, us-gaap:GuaranteedMinimumIncomeBenefit



Period End2020-03-31
Value1.0
Percentage of ConcentrationRiskPercentage1100.0

ci:LibertyMutualInsurance, us-gaap:CededCreditRiskSecured, ci:GuaranteedMinimumIncomeBenefitsAssets, us-gaap:GuaranteedMinimumIncomeBenefit



Period End2020-03-31
Value0.73
Percentage of ConcentrationRiskPercentage173.0

us-gaap:CostOfGoodsAndServicesSold



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value24190241032455224963240503017602613561
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded



Period End2020-03-312019-03-31
Value550
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded100.00.0

us-gaap:DebtSecuritiesAvailableForSaleRealizedGain



Period End2020-03-312019-03-31
Value3914
Percentage of DebtSecuritiesAvailableForSaleRealizedGain100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss



Period End2020-03-312019-03-31
Value710
Percentage of DebtSecuritiesAvailableForSaleRealizedLoss100.0100.0

us-gaap:DividendsCommonStockCash



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value150001500010
Percentage of DividendsCommonStockCash100.00.00.00.0100.00.00.00.0100.0

us-gaap:StatementEquityComponents

us-gaap:Parent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value150001500010
Percentage of DividendsCommonStockCash100.00.00.00.0100.00.00.00.0100.0

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value150001500010
Percentage of DividendsCommonStockCash100.00.00.00.0100.00.00.00.0100.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations



Period End2020-03-312019-03-31
Value-37-12
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations100.0100.0

us-gaap:FairValueByAssetClass

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1

ci:DebtAndEquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-12-1-60-1-10-1-20
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1100.0100.0100.00.0100.0100.00.0100.0100.0

us-gaap:FairValueByAssetClass

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss

ci:DebtAndEquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-71645702-5-5
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:FairValueByAssetClass

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases

ci:DebtAndEquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value62191043033610
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases100.0100.0100.0100.00.0100.0100.0100.0100.0

us-gaap:FairValueByAssetClass

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements

ci:DebtAndEquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4816434-1-38-11-7-3
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByAssetClass

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales

ci:DebtAndEquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value12000000011
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales100.00.00.00.00.00.00.00.0100.0

us-gaap:FairValueByAssetClass

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements

ci:DebtAndEquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value236914114132
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByAssetClass

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3

ci:DebtAndEquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value34857801320024020
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3100.0100.0100.0100.0100.00.0100.00.0100.0

us-gaap:FairValueByAssetClass

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet

ci:DebtAndEquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2562180-4419-19-49-53-104
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByAssetClass

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3

ci:DebtAndEquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value92360571197353124
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3100.0100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:GainsLossesOnExtinguishmentOfDebt



Period End2020-03-312019-03-312017-09-30
Value-1850-321
Percentage of GainsLossesOnExtinguishmentOfDebt100.00.0100.0

us-gaap:IncomeTaxesPaidNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value8116941711612925224848831
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsAndOtherReceivables



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1056-4586769396-948238-4853
Percentage of IncreaseDecreaseInAccountsAndOtherReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value161-8715979162118-113-9
Percentage of IncreaseDecreaseInDeferredIncomeTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDeferredPolicyAcquisitionCosts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1388063485142566376
Percentage of IncreaseDecreaseInDeferredPolicyAcquisitionCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInInsuranceLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value341-15293-63360152-547106849
Percentage of IncreaseDecreaseInInsuranceLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInReinsuranceRecoverable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value210185-85301-124589-166-138-51
Percentage of IncreaseDecreaseInReinsuranceRecoverable100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value403340323
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestPaidNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value395388392488377100408146
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0

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us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1

ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value427162965926584337865385521050013382
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1100.0100.0100.0100.0100.0100.0100.0100.0100.0

ci:InternationalMarketsGroupDisabilityAndLife



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4901066100794147410081007905471
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear111.516.917.016.112.518.719.318.113.9

us-gaap:StatementBusinessSegments

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1

ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value202736262261908191501641540
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1100.0100.0100.0100.0100.0100.0100.0100.0100.0

ci:InternationalMarketsGroupDisabilityAndLife



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value946279319419856247290418853
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears146.7775.01226.9185.444.9129.3580.0254.955.4

us-gaap:StatementBusinessSegments

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyTranslationGainLoss

ci:InternationalMarketsGroupDisabilityAndLife



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value25-15109725216-2
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyTranslationGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1

ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value650961936039599359785485523052745169
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1100.0100.0100.0100.0100.0100.0100.0100.0100.0

ci:InternationalMarketsGroupDisabilityAndLife



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value156114651410141914341359131313171370
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims124.023.723.323.724.024.825.125.026.5

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value873243222
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NetIncomeLossAttributableToNonredeemableNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value440010000
Percentage of NetIncomeLossAttributableToNonredeemableNoncontrollingInterest100.0100.00.00.0100.00.00.00.00.0

us-gaap:NetIncomeLossAttributableToRedeemableNoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value43233222
Percentage of NetIncomeLossAttributableToRedeemableNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1181977135114081368144772806915266560813598
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1185981135114081369144772806915
Percentage of NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value44001
Percentage of NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest0.30.40.00.00.1

us-gaap:Parent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1181977135114081368144772806915
Percentage of NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest99.799.6100.0100.099.9100.0100.0100.0100.0

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1181977135114081368144772806915
Percentage of NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest99.799.6100.0100.099.9100.0100.0100.0100.0

us-gaap:OperatingIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value20611561212321632230559113211611308
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax

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Period End2020-03-312019-03-31
Value-580565
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax100.0100.0

us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

ci:AOCIAccumulatedGainLossDebtSecuritiesAvailableForSaleAndDerivativesParent



Period End2020-03-312019-03-31
Value-453443
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax100.0100.0

us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax

ci:AOCIAccumulatedGainLossDebtSecuritiesAvailableForSaleAndDerivativesParent



Period End2020-03-312019-03-31
Value-127122
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-586-88107317429146-14-296-226
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

ci:AOCIAccumulatedGainLossDebtSecuritiesAvailableForSaleAndDerivativesParent



Period End2020-03-312019-03-31
Value-428442
Percentage of OtherComprehensiveIncomeLossNetOfTax73.0103.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-03-31
Value1311
Percentage of OtherComprehensiveIncomeLossNetOfTax-2.22.6

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-586107317429146-14-296-226
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-03-31
Value-171-24
Percentage of OtherComprehensiveIncomeLossNetOfTax29.2-5.6

us-gaap:Parent



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-586107317429146-14-296-226
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax



Period End2020-03-312019-03-31
Value-13-11
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax100.0100.0

us-gaap:OtherNonoperatingIncomeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-391-391-411-428-452-286-99-56-57
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

us-gaap:PaymentsForLossesAndLossAdjustmentExpense

ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value629863325952606956945576526051654922
Percentage of PaymentsForLossesAndLossAdjustmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0

ci:InternationalMarketsGroupDisabilityAndLife



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value143613451326136013301255129713231324
Percentage of PaymentsForLossesAndLossAdjustmentExpense22.821.222.322.423.422.524.725.626.9

us-gaap:PaymentsForProceedsFromOtherInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-374160012
Percentage of PaymentsForProceedsFromOtherInvestingActivities100.0100.0100.0100.00.00.0100.0

us-gaap:PaymentsOfDebtExtinguishmentCosts



Period End2020-03-312019-03-31
Value1920
Percentage of PaymentsOfDebtExtinguishmentCosts100.00.0

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value014700624455000
Percentage of PaymentsToAcquireBusinessesNetOfCashAcquired0.0100.00.00.0100.0100.00.00.00.0

us-gaap:PaymentsToAcquireMortgageNotesReceivable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value086378995249412668
Percentage of PaymentsToAcquireMortgageNotesReceivable0.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireOtherInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value380539367459388529159295206
Percentage of PaymentsToAcquireOtherInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromCollectionOfLoansReceivable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value5255808934936028
Percentage of ProceedsFromCollectionOfLoansReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromIssuanceOfCommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1531233117532714720
Percentage of ProceedsFromIssuanceOfCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value841-2-33-73-108-101-11-92
Percentage of ProceedsFromPaymentsForOtherFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleAndMaturityOfOtherInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value346333328283367146176300112
Percentage of ProceedsFromSaleAndMaturityOfOtherInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value7438355915651086695657774499
Percentage of ProceedsFromSaleOfAvailableForSaleSecuritiesDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax

ci:AOCIAccumulatedGainLossDebtSecuritiesAvailableForSaleAndDerivativesParent



Period End2020-03-312019-03-31
Value-321
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax100.0100.0

ci:AccumulatedDefinedBenefitPlansAdjustmentSettlement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0000-100000
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax-0.00.00.00.0-1000.00.00.00.00.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCredit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-18-15-16-16-15-16-19-17-17
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax56.20.00.00.0-1500.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax

ci:AOCIAccumulatedGainLossDebtSecuritiesAvailableForSaleAndDerivativesParent



Period End2020-03-312019-03-31
Value-251
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax100.0100.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-13-12-13-21-11-14-13-14
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax52.00.00.00.0-1100.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAociCurrentPeriodTax

ci:AOCIAccumulatedGainLossDebtSecuritiesAvailableForSaleAndDerivativesParent



Period End2020-03-312019-03-31
Value-70
Percentage of ReclassificationFromAociCurrentPeriodTax100.00.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-5-3-35-14-2-6-3-4
Percentage of ReclassificationFromAociCurrentPeriodTax71.40.00.00.00.00.00.00.00.0

us-gaap:ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value178103180535915214056104
Percentage of ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

ci:HomeDeliveryAndSpecialty



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value11714118751183712272117841775747758717
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0

ci:NetworkPharmacy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value12142124771292312758122731415000
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax103.7105.1109.2104.0104.179.70.00.00.0

ci:OtherPharmacy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1242129312271258112267000
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.610.910.410.39.53.80.00.00.0

ci:ServiceFees



Period End2020-03-312019-03-31
Value21542390
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.420.3

us-gaap:Product



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value25098256452598726288251793257747758717
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax214.3216.0219.5214.2213.7183.5100.0100.0100.0

us-gaap:Service



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value217822402285238824501491136113581368
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.618.919.319.520.884.0182.2179.2190.8

us-gaap:ServiceOther



Period End2020-03-312019-03-31
Value2460
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.5

us-gaap:StatementBusinessSegments

us-gaap:ShortdurationInsuranceContractsDiscountedLiabilitiesInterestAccretion

ci:InternationalMarketsGroupDisabilityAndLife



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value423536433841383938
Percentage of ShortdurationInsuranceContractsDiscountedLiabilitiesInterestAccretion100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value17018999887513543822
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2481912243610414111123
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation145.9101.1226.340.9138.7107.720.428.9104.5

us-gaap:Parent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value17018999887513543822
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-78-2-12552-2931634468
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation-45.9-1.1-126.359.1-38.7238.5116.7115.8309.1

us-gaap:StatementBusinessSegments

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense

ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value666161996049602560955500524353045284
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0

ci:InternationalMarketsGroupDisabilityAndLife



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value147314111391138614281304134713061393
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense22.122.823.023.023.423.725.724.626.4

us-gaap:NoncatastrophicEvent, us-gaap:StatementBusinessSegments

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense

ci:CompletionFactors, ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-63-34-36-55-13-15
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense100.0100.0100.0100.0100.0100.0100.0

ci:MedicalCostTrend, ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-89-3-144-62-22
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense141.3100.0-350.0-11.1112.715.4-13.3

us-gaap:StatementBusinessSegments

ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-152-6-10-32-117-15-13-30-115
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense241.3200.0-250.088.9212.7115.486.70.00.0

us-gaap:TemporaryEquityNetIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value433233222
Percentage of TemporaryEquityNetIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStockValueAcquiredCostMethod



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value9794416764064625400275
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.0100.0100.0100.00.00.0100.0

us-gaap:StatementEquityComponents

us-gaap:Parent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value9794416764064625400275
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.0100.0100.0100.00.00.0100.0

us-gaap:TreasuryStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value9794416764064625400275
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.0100.0100.0100.00.00.0100.0

us-gaap:WeightedAverageNumberOfSharesIssuedBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value370-13743773794242242242
Percentage of WeightedAverageNumberOfSharesIssuedBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:WithdrawalFromContractHoldersFunds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value255252303291251279278288306
Percentage of WithdrawalFromContractHoldersFunds100.0100.0100.0100.0100.0100.0100.0100.0100.0

ci:AccruedExpensesAndOtherLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value7585734771966713736170713963
Percentage of AccruedExpensesAndOtherLiabilities100.0100.0100.0100.0100.0100.0100.0

ci:AllowanceForReceivablesNetCurrent



Period End2020-03-312019-12-312018-12-31
Value928778217
Percentage of AllowanceForReceivablesNetCurrent100.0100.0100.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

ci:AlternativeInvestmentBeforeReclassificationToDisposalGroupAssetsHeldForSale

ci:SeparateAccountAssets, us-gaap:FairValueMeasuredAtNetAssetValuePerShare, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-31
Value742756
Percentage of AlternativeInvestmentBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

ci:SeparateAccountAssets, us-gaap:FairValueMeasuredAtNetAssetValuePerShare, us-gaap:FairValueMeasurementsRecurring, srt:PartnershipInterest



Period End2020-03-312019-12-31
Value513531
Percentage of AlternativeInvestmentBeforeReclassificationToDisposalGroupAssetsHeldForSale69.170.2

ci:SeparateAccountAssets, us-gaap:FairValueMeasuredAtNetAssetValuePerShare, us-gaap:FairValueMeasurementsRecurring, us-gaap:RealEstateFunds



Period End2020-03-312019-12-31
Value224220
Percentage of AlternativeInvestmentBeforeReclassificationToDisposalGroupAssetsHeldForSale30.229.1

us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-31
Value179184
Percentage of AlternativeInvestmentBeforeReclassificationToDisposalGroupAssetsHeldForSale24.124.3

ci:AvailableForSaleDebtSecuritiesAmortizedCostBasisBeforeReclassificationToDisposalGroupAssetsHeldForSale



Period End2020-03-312019-12-31
Value2167521909
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasisBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

us-gaap:FinancialInstrument

ci:CorporateDebtSecuritiesWithRecordedAllowance



Period End2020-03-31
Value145
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasisBeforeReclassificationToDisposalGroupAssetsHeldForSale0.7

us-gaap:AssetBackedSecurities



Period End2020-03-312019-12-31
Value495506
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasisBeforeReclassificationToDisposalGroupAssetsHeldForSale2.32.3

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-31
Value1813818149
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasisBeforeReclassificationToDisposalGroupAssetsHeldForSale83.782.8

us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-312019-12-31
Value19302027
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasisBeforeReclassificationToDisposalGroupAssetsHeldForSale8.99.3

us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-31
Value701729
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasisBeforeReclassificationToDisposalGroupAssetsHeldForSale3.23.3

us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-31
Value411498
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasisBeforeReclassificationToDisposalGroupAssetsHeldForSale1.92.3

us-gaap:StatementBusinessSegments

ci:RunoffSettlementAnnuityBusiness



Period End2020-03-312019-12-31
Value21892229
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasisBeforeReclassificationToDisposalGroupAssetsHeldForSale10.110.2

ci:AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTaxBeforeReclassificationToDisposalGroupAssetsHeldForSale



Period End2020-03-312019-12-31
Value13861876
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTaxBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

us-gaap:FinancialInstrument

us-gaap:AssetBackedSecurities



Period End2020-03-312019-12-31
Value1631
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTaxBeforeReclassificationToDisposalGroupAssetsHeldForSale1.21.7

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-31
Value8231299
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTaxBeforeReclassificationToDisposalGroupAssetsHeldForSale59.469.2

us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-312019-12-31
Value255230
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTaxBeforeReclassificationToDisposalGroupAssetsHeldForSale18.412.3

us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-31
Value7681
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTaxBeforeReclassificationToDisposalGroupAssetsHeldForSale5.54.3

us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-31
Value216235
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTaxBeforeReclassificationToDisposalGroupAssetsHeldForSale15.612.5

us-gaap:StatementBusinessSegments

ci:RunoffSettlementAnnuityBusiness



Period End2020-03-312019-12-31
Value627740
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTaxBeforeReclassificationToDisposalGroupAssetsHeldForSale45.239.4

ci:AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTaxBeforeReclassificationToDisposalGroupAssetsHeldForSale



Period End2020-03-312019-12-31
Value48830
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTaxBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

us-gaap:FinancialInstrument

us-gaap:AssetBackedSecurities



Period End2020-03-312019-12-31
Value231
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTaxBeforeReclassificationToDisposalGroupAssetsHeldForSale4.73.3

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-31
Value45828
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTaxBeforeReclassificationToDisposalGroupAssetsHeldForSale93.993.3

us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-312019-12-31
Value71
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTaxBeforeReclassificationToDisposalGroupAssetsHeldForSale1.43.3

us-gaap:StatementBusinessSegments

ci:RunoffSettlementAnnuityBusiness



Period End2020-03-312019-12-31
Value454
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTaxBeforeReclassificationToDisposalGroupAssetsHeldForSale9.213.3

ci:InvestmentsCreditRating

ci:AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLossBeforeReclassificationToDisposalGroupAssetsHeldForSale

ci:BelowInvestmentGrade



Period End2020-03-312019-12-31
Value174
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLossBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

ci:InvestmentGrade



Period End2020-03-312019-12-31
Value3212
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLossBeforeReclassificationToDisposalGroupAssetsHeldForSale188.2300.0

ci:InvestmentsCreditRating

ci:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLossBeforeReclassificationToDisposalGroupAssetsHeldForSale

ci:BelowInvestmentGrade



Period End2020-03-312019-12-31
Value1738
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLossBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

ci:InvestmentGrade



Period End2020-03-312019-12-31
Value2666
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLossBeforeReclassificationToDisposalGroupAssetsHeldForSale153.875.0

ci:InvestmentsCreditRating

ci:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAmortizedCostBeforeReclassificationToDisposalGroupAssetsHeldForSale

ci:BelowInvestmentGrade



Period End2020-03-312019-12-31
Value1712348
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAmortizedCostBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

ci:InvestmentGrade



Period End2020-03-312019-12-31
Value4816729
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAmortizedCostBeforeReclassificationToDisposalGroupAssetsHeldForSale281.3209.5

ci:InvestmentsCreditRating

ci:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValueBeforeReclassificationToDisposalGroupAssetsHeldForSale

ci:BelowInvestmentGrade



Period End2020-03-312019-12-31
Value1539340
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValueBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

ci:InvestmentGrade



Period End2020-03-312019-12-31
Value4550723
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValueBeforeReclassificationToDisposalGroupAssetsHeldForSale295.6212.6

ci:InvestmentsCreditRating

ci:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCostBeforeReclassificationToDisposalGroupAssetsHeldForSale

ci:BelowInvestmentGrade



Period End2020-03-312019-12-31
Value8188
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCostBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

ci:InvestmentGrade



Period End2020-03-312019-12-31
Value226378
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCostBeforeReclassificationToDisposalGroupAssetsHeldForSale279.0429.5

ci:InvestmentsCreditRating

ci:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValueBeforeReclassificationToDisposalGroupAssetsHeldForSale

ci:BelowInvestmentGrade



Period End2020-03-312019-12-31
Value6484
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValueBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

ci:InvestmentGrade



Period End2020-03-312019-12-31
Value194366
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValueBeforeReclassificationToDisposalGroupAssetsHeldForSale303.1435.7

ci:AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale



Period End2020-03-312019-12-31
Value2257323755
Percentage of AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-31
Value193197
Percentage of AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale0.90.8

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-31
Value2162923035
Percentage of AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale95.897.0

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-31
Value751523
Percentage of AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale3.32.2

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-31
Value193197
Percentage of AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale0.90.8

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:AssetBackedSecurities



Period End2020-03-312019-12-31
Value321398
Percentage of AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale1.41.7

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-31
Value1794419063
Percentage of AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale79.580.2

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-312019-12-31
Value21532228
Percentage of AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale9.59.4

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-31
Value777810
Percentage of AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale3.43.4

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-31
Value434536
Percentage of AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale1.92.3

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, us-gaap:AssetBackedSecurities



Period End2020-03-312019-12-31
Value167138
Percentage of AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale0.70.6

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-31
Value559357
Percentage of AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale2.51.5

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-312019-12-31
Value2528
Percentage of AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale0.10.1

us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-31
Value2257323755
Percentage of AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementsRecurring, us-gaap:AssetBackedSecurities



Period End2020-03-312019-12-31
Value488536
Percentage of AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale2.22.3

us-gaap:FairValueMeasurementsRecurring, us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-31
Value1850319420
Percentage of AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale82.081.8

us-gaap:FairValueMeasurementsRecurring, us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-312019-12-31
Value21782256
Percentage of AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale9.69.5

us-gaap:FairValueMeasurementsRecurring, us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-31
Value777810
Percentage of AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale3.43.4

us-gaap:FairValueMeasurementsRecurring, us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-31
Value627733
Percentage of AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale2.83.1

us-gaap:FinancialInstrument

ci:CorporateDebtSecuritiesWithRecordedAllowance



Period End2020-03-31
Value90
Percentage of AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale0.4

us-gaap:AssetBackedSecurities



Period End2020-03-312019-12-31
Value488536
Percentage of AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale2.22.3

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-31
Value1850319420
Percentage of AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale82.081.8

us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-312019-12-31
Value21782256
Percentage of AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale9.69.5

us-gaap:USStatesAndPoliticalSubdivisions



Period End2020-03-312019-12-31
Value777810
Percentage of AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale3.43.4

us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-31
Value627733
Percentage of AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale2.83.1

us-gaap:StatementBusinessSegments

ci:RunoffSettlementAnnuityBusiness



Period End2020-03-312019-12-31
Value27712965
Percentage of AvailableForSaleSecuritiesDebtSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale12.312.5

ci:InvestmentsCreditRating

ci:AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureLessThan12MonthsNumberOfPositionsBeforeReclassificationToDisposalGroupAssetsHeldForSale

ci:BelowInvestmentGrade



Period End2020-03-312019-12-31
Value1150.0355.0
Percentage of AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureLessThan12MonthsNumberOfPositionsBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

ci:InvestmentGrade



Period End2020-03-312019-12-31
Value1023.0267.0
Percentage of AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureLessThan12MonthsNumberOfPositionsBeforeReclassificationToDisposalGroupAssetsHeldForSale89.075.2

ci:InvestmentsCreditRating

ci:AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureTwelveMonthsOrLongerNumberOfPositionsBeforeReclassificationToDisposalGroupAssetsHeldForSale

ci:BelowInvestmentGrade



Period End2020-03-312019-12-31
Value56.093.0
Percentage of AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureTwelveMonthsOrLongerNumberOfPositionsBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

ci:InvestmentGrade



Period End2020-03-312019-12-31
Value34.0118.0
Percentage of AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureTwelveMonthsOrLongerNumberOfPositionsBeforeReclassificationToDisposalGroupAssetsHeldForSale60.7126.9

ci:ShortTermInvestmentsAndCashEquivalents

ci:CashCashEquivalentsAndShortTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale

us-gaap:CorporateDebtSecurities



Period End2020-03-312019-12-31
Value19541985
Percentage of CashCashEquivalentsAndShortTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-312019-12-31
Value2565
Percentage of CashCashEquivalentsAndShortTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale1.33.3

us-gaap:MoneyMarketFunds



Period End2020-03-312019-12-31
Value963631
Percentage of CashCashEquivalentsAndShortTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale49.331.8

us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-31
Value110472
Percentage of CashCashEquivalentsAndShortTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale5.623.8

us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

ci:DerivativeAssetsBeforeReclassificationToDisposalGroupAssetsHeldForSale

us-gaap:Swap, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-31
Value23983
Percentage of DerivativeAssetsBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency

us-gaap:Swap, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-31
Value23983
Percentage of DerivativeAssetsBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

ci:DerivativeLiabilitiesBeforeReclassificationToDisposalGroupLiabilitiesHeldForSale

us-gaap:Swap, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-31
Value1918
Percentage of DerivativeLiabilitiesBeforeReclassificationToDisposalGroupLiabilitiesHeldForSale100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency

us-gaap:Swap, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-31
Value1918
Percentage of DerivativeLiabilitiesBeforeReclassificationToDisposalGroupLiabilitiesHeldForSale100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation

ci:DerivativeNotionalAmountBeforeReclassificationToDisposalGroupAssetsHeldForSale

us-gaap:CurrencySwap, us-gaap:NetInvestmentHedging, us-gaap:DesignatedAsHedgingInstrument



Period End2020-03-312019-12-31
Value526844
Percentage of DerivativeNotionalAmountBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

us-gaap:ForeignExchangeForward, us-gaap:NetInvestmentHedging, us-gaap:DesignatedAsHedgingInstrument



Period End2020-03-312019-12-31
Value426406
Percentage of DerivativeNotionalAmountBeforeReclassificationToDisposalGroupAssetsHeldForSale81.048.1

us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:ForeignExchangeForward, us-gaap:Nondesignated



Period End2020-03-312019-12-31
Value439410
Percentage of DerivativeNotionalAmountBeforeReclassificationToDisposalGroupAssetsHeldForSale83.548.6

ci:DisposalGroupIncludingDiscontinuedOperationCurrentInsuranceAndContractholderLiabilities



Period End2020-03-312019-12-31
Value21302089
Percentage of DisposalGroupIncludingDiscontinuedOperationCurrentInsuranceAndContractholderLiabilities100.0100.0

ci:DisposalGroupIncludingDiscontinuedOperationCurrentInvestmentsCurrent



Period End2020-03-312019-12-31
Value347414
Percentage of DisposalGroupIncludingDiscontinuedOperationCurrentInvestmentsCurrent100.0100.0

ci:DisposalGroupIncludingDiscontinuedOperationInsuranceAndContractholderLiabilities



Period End2020-03-312019-12-31
Value64416308
Percentage of DisposalGroupIncludingDiscontinuedOperationInsuranceAndContractholderLiabilities100.0100.0

us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperations, ci:GroupDisabilityAndLife



Period End2020-03-312019-12-31
Value64416308
Percentage of DisposalGroupIncludingDiscontinuedOperationInsuranceAndContractholderLiabilities100.0100.0

ci:DisposalGroupIncludingDiscontinuedOperationInvestments



Period End2020-03-312019-12-31
Value76597709
Percentage of DisposalGroupIncludingDiscontinuedOperationInvestments100.0100.0

ci:DisposalGroupIncludingDiscontinuedOperationInvestmentsCurrent



Period End2020-03-312019-12-31
Value77007709
Percentage of DisposalGroupIncludingDiscontinuedOperationInvestmentsCurrent100.0100.0

us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperations, ci:GroupDisabilityAndLife



Period End2020-03-312019-12-31
Value76597709
Percentage of DisposalGroupIncludingDiscontinuedOperationInvestmentsCurrent99.5100.0

ci:DisposalGroupIncludingDiscontinuedOperationNoncurrentInsuranceAndContractholderLiabilities



Period End2020-03-312019-12-31
Value43114219
Percentage of DisposalGroupIncludingDiscontinuedOperationNoncurrentInsuranceAndContractholderLiabilities100.0100.0

ci:DisposalGroupIncludingDiscontinuedOperationNoncurrentInvestmentsCurrent



Period End2020-03-312019-12-31
Value73127295
Percentage of DisposalGroupIncludingDiscontinuedOperationNoncurrentInvestmentsCurrent100.0100.0

ci:DisposalGroupIncludingDiscontinuedOperationSeparateAccountAssetsCurrent



Period End2020-03-312019-12-31
Value1216
Percentage of DisposalGroupIncludingDiscontinuedOperationSeparateAccountAssetsCurrent100.0100.0

ci:EquitySecuritiesFVNIAndWithoutReadilyDeterminableFairValueAndHybridInstrumentsAmortizedCostBeforeReclassificationToDisposalGroupAssetsHeldForSale



Period End2020-03-312019-12-31
Value381302
Percentage of EquitySecuritiesFVNIAndWithoutReadilyDeterminableFairValueAndHybridInstrumentsAmortizedCostBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

ci:EquitySecuritiesFVNIAndWithoutReadilyDeterminableFairValueAndHybridInstrumentsCarryingAmount



Period End2020-03-312019-12-31
Value347303
Percentage of EquitySecuritiesFVNIAndWithoutReadilyDeterminableFairValueAndHybridInstrumentsCarryingAmount100.0100.0

ci:EquitySecuritiesFvNiBeforeReclassificationToDisposalGroupAssetsHeldForSale



Period End2020-03-312019-12-31
Value12664
Percentage of EquitySecuritiesFvNiBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-31
Value67
Percentage of EquitySecuritiesFvNiBeforeReclassificationToDisposalGroupAssetsHeldForSale4.810.9

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-31
Value13072
Percentage of EquitySecuritiesFvNiBeforeReclassificationToDisposalGroupAssetsHeldForSale103.2112.5

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-31
Value1532
Percentage of EquitySecuritiesFvNiBeforeReclassificationToDisposalGroupAssetsHeldForSale11.950.0

us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-31
Value151111
Percentage of EquitySecuritiesFvNiBeforeReclassificationToDisposalGroupAssetsHeldForSale119.8173.4

ci:EquitySecuritiesFvNiCostBeforeReclassificationToDisposalGroupAssetsHeldForSale



Period End2020-03-312019-12-31
Value13661
Percentage of EquitySecuritiesFvNiCostBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

ci:EquitySecuritiesHybridInstrumentsCarryingAmountBeforeReclassificationToDisposalGroupAssetsHeldForSale



Period End2020-03-312019-12-31
Value2547
Percentage of EquitySecuritiesHybridInstrumentsCarryingAmountBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

ci:EquitySecuritiesWithoutReadilyDeterminableFairValueAmortizedCostBeforeReclassificationToDisposalGroupAssetsHeldForSale



Period End2020-03-312019-12-31
Value187183
Percentage of EquitySecuritiesWithoutReadilyDeterminableFairValueAmortizedCostBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

ci:EquitySecuritiesWithoutReadilyDeterminableFairValueAmountBeforeReclassificationToDisposalGroupAssetsHeldForSale



Period End2020-03-312019-12-31
Value196192
Percentage of EquitySecuritiesWithoutReadilyDeterminableFairValueAmountBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

us-gaap:FairValueByAssetClass

ci:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValueBeforeReclassificationToDisposalGroupAssetsHeldForSale

ci:DebtAndEquitySecurities



Period End2020-03-312019-12-312019-03-312018-12-31
Value766555436410
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValueBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0100.0100.0

ci:FinanceLeaseRightOfUseAssetAccumulatedAmortization



Period End2020-03-312019-12-31
Value3223
Percentage of FinanceLeaseRightOfUseAssetAccumulatedAmortization100.0100.0

ci:FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization



Period End2020-03-312019-12-31
Value113110
Percentage of FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization100.0100.0

us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

ci:FinancingReceivableAfterAllowanceForCreditLossBeforeReclassificationToDisposalGroupAssetsHeldForSale

us-gaap:CommercialPortfolioSegment, us-gaap:RealEstateLoan



Period End2020-03-312019-12-31
Value19351947
Percentage of FinancingReceivableAfterAllowanceForCreditLossBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:LoanToValue

ci:FinancingReceivableBeforeAllowanceForCreditLossBeforeReclassificationToDisposalGroupAssetsHeldForSale

us-gaap:CommercialPortfolioSegment, us-gaap:RealEstateLoan, ci:Ltv60To79Percent



Period End2020-03-312019-12-31
Value722723
Percentage of FinancingReceivableBeforeAllowanceForCreditLossBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

us-gaap:CommercialPortfolioSegment, us-gaap:RealEstateLoan, ci:LtvLessThan60Percent



Period End2020-03-312019-12-31
Value11321136
Percentage of FinancingReceivableBeforeAllowanceForCreditLossBeforeReclassificationToDisposalGroupAssetsHeldForSale156.8157.1

ci:GuaranteedSeparateAccountAssetsBeforeReclassificationToDisposalGroupAssetsHeldForSale



Period End2020-03-312019-12-31
Value462490
Percentage of GuaranteedSeparateAccountAssetsBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1



Period End2020-03-312019-12-31
Value197219
Percentage of GuaranteedSeparateAccountAssetsBeforeReclassificationToDisposalGroupAssetsHeldForSale42.644.7

us-gaap:FairValueInputsLevel2



Period End2020-03-312019-12-31
Value265271
Percentage of GuaranteedSeparateAccountAssetsBeforeReclassificationToDisposalGroupAssetsHeldForSale57.455.3

ci:InsuranceAndContractholderLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value20868209732727027048271032677526618273232751826847
Percentage of InsuranceAndContractholderLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ci:InsuranceAndContractholderLiabilitiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value5030492171806930706068016317
Percentage of InsuranceAndContractholderLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0

ci:InsuranceAndContractholderLiabilitiesCurrentIncludingDisposalGroups



Period End2020-03-312019-12-31
Value71607010
Percentage of InsuranceAndContractholderLiabilitiesCurrentIncludingDisposalGroups100.0100.0

ci:InsuranceAndContractholderLiabilitiesIncludingDisposalGroups



Period End2020-03-312019-12-31
Value2730927281
Percentage of InsuranceAndContractholderLiabilitiesIncludingDisposalGroups100.0100.0

ci:InsuranceAndContractholderLiabilitiesNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value15838160522009020118200431997420530
Percentage of InsuranceAndContractholderLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0

ci:InsuranceAndContractholderLiabilitiesNoncurrentIncludingDisposalGroups



Period End2020-03-312019-12-31
Value2014920271
Percentage of InsuranceAndContractholderLiabilitiesNoncurrentIncludingDisposalGroups100.0100.0

ci:InsuranceCustomerReceivables



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value2839232124332144226118881818
Percentage of InsuranceCustomerReceivables100.0100.0100.0100.0100.0100.0100.0

ci:InvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale



Period End2020-03-312019-12-31
Value2924030188
Percentage of InvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

us-gaap:InvestmentType

us-gaap:DebtSecurities



Period End2020-03-312019-12-31
Value2257323755
Percentage of InvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale77.278.7

us-gaap:EquitySecurities



Period End2020-03-312019-12-31
Value347303
Percentage of InvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale1.21.0

us-gaap:Mortgages



Period End2020-03-312019-12-31
Value19351947
Percentage of InvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale6.66.4

us-gaap:OtherLongTermInvestments



Period End2020-03-312019-12-31
Value27352403
Percentage of InvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale9.48.0

us-gaap:PolicyLoans



Period End2020-03-312019-12-31
Value13441357
Percentage of InvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale4.64.5

us-gaap:ShortTermInvestments



Period End2020-03-312019-12-31
Value306423
Percentage of InvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale1.01.4

ci:LiabilityForClaimsAndClaimsAdjustmentExpenseAttributableToDisposalGroups



Period End2020-03-312019-12-31
Value51004900
Percentage of LiabilityForClaimsAndClaimsAdjustmentExpenseAttributableToDisposalGroups100.0100.0

us-gaap:StatementBusinessSegments

ci:LiabilityForClaimsAndClaimsAdjustmentExpenseCurrentIncludingDisposalGroups

ci:IntegratedMedical



Period End2020-03-312019-12-31
Value29822875
Percentage of LiabilityForClaimsAndClaimsAdjustmentExpenseCurrentIncludingDisposalGroups100.0100.0

ci:InternationalMarketsAndGroupDisabilityAndOther



Period End2020-03-312019-12-31
Value25442529
Percentage of LiabilityForClaimsAndClaimsAdjustmentExpenseCurrentIncludingDisposalGroups85.388.0

us-gaap:StatementBusinessSegments

ci:LiabilityForClaimsAndClaimsAdjustmentExpenseExcludingPhysicianIncentivesAndOtherExpenses

ci:IntegratedMedical



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value270027002800270027002700250026002500
Percentage of LiabilityForClaimsAndClaimsAdjustmentExpenseExcludingPhysicianIncentivesAndOtherExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

ci:LiabilityForClaimsAndClaimsAdjustmentExpenseIncludingDisposalGroups

ci:GroupDisabilityAndLife



Period End2020-03-312019-12-31
Value50844972
Percentage of LiabilityForClaimsAndClaimsAdjustmentExpenseIncludingDisposalGroups100.0100.0

ci:GroupDisabilityAndOther



Period End2020-03-312019-12-31
Value52935159
Percentage of LiabilityForClaimsAndClaimsAdjustmentExpenseIncludingDisposalGroups104.1103.8

ci:GroupDisabilityAndOtherAndInternationalMarkets



Period End2020-03-31
Value6119
Percentage of LiabilityForClaimsAndClaimsAdjustmentExpenseIncludingDisposalGroups120.4

ci:IntegratedMedical



Period End2020-03-312019-12-31
Value30002892
Percentage of LiabilityForClaimsAndClaimsAdjustmentExpenseIncludingDisposalGroups59.058.2

ci:InternationalMarkets



Period End2020-03-312019-12-31
Value826844
Percentage of LiabilityForClaimsAndClaimsAdjustmentExpenseIncludingDisposalGroups16.217.0

ci:InternationalMarketsAndGroupDisabilityAndOther



Period End2020-03-312019-12-31
Value61196003
Percentage of LiabilityForClaimsAndClaimsAdjustmentExpenseIncludingDisposalGroups120.4120.7

ci:InternationalMarketsGroupDisabilityAndLife



Period End2020-03-312019-12-31
Value59105816
Percentage of LiabilityForClaimsAndClaimsAdjustmentExpenseIncludingDisposalGroups116.2117.0

us-gaap:AllOtherSegments



Period End2020-03-312019-12-31
Value209187
Percentage of LiabilityForClaimsAndClaimsAdjustmentExpenseIncludingDisposalGroups4.13.8

us-gaap:StatementBusinessSegments

ci:LiabilityForClaimsAndClaimsAdjustmentExpenseNoncurrentIncludingDisposalGroups

ci:IntegratedMedical



Period End2020-03-312019-12-31
Value1817
Percentage of LiabilityForClaimsAndClaimsAdjustmentExpenseNoncurrentIncludingDisposalGroups100.0100.0

ci:InternationalMarketsAndGroupDisabilityAndOther



Period End2020-03-312019-12-31
Value35753474
Percentage of LiabilityForClaimsAndClaimsAdjustmentExpenseNoncurrentIncludingDisposalGroups19861.120435.3

ci:LiabilityForFuturePolicyBenefitsAttributableToDisposalGroups



Period End2020-03-312019-12-31
Value640653
Percentage of LiabilityForFuturePolicyBenefitsAttributableToDisposalGroups100.0100.0

ci:LiabilityForFuturePolicyBenefitsCurrentIncludingDisposalGroups



Period End2020-03-312019-12-31
Value541553
Percentage of LiabilityForFuturePolicyBenefitsCurrentIncludingDisposalGroups100.0100.0

ci:LiabilityForFuturePolicyBenefitsIncludingDisposalGroups



Period End2020-03-312019-12-31
Value96519834
Percentage of LiabilityForFuturePolicyBenefitsIncludingDisposalGroups100.0100.0

ci:LiabilityForFuturePolicyBenefitsNoncurrentIncludingDisposalGroups



Period End2020-03-312019-12-31
Value91109281
Percentage of LiabilityForFuturePolicyBenefitsNoncurrentIncludingDisposalGroups100.0100.0

us-gaap:StatementBusinessSegments

ci:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetIncludingDisposalGroups

ci:IntegratedMedical



Period End2020-03-312019-12-31
Value28002589
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetIncludingDisposalGroups100.0100.0

ci:InternationalMarketsGroupDisabilityAndLife



Period End2020-03-312019-12-31
Value57325632
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetIncludingDisposalGroups204.7217.5

us-gaap:DebtInstrument

ci:LineOfCreditFacilityDebtToAdjustedCapitalRatioCovenant

ci:A364DayTermLoan



Period End2020-03-31
Value0.6
Percentage of LineOfCreditFacilityDebtToAdjustedCapitalRatioCovenant100.0

us-gaap:Range, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:ValuationTechnique

ci:LiquidityAdjustmentUsedInPricingLevel3SecuritiesDirectlyDevelopedByCompanyBeforeReclassificationToDisposalGroupAssetsHeldForSale

srt:Maximum, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, ci:CorporateAndGovernmentDebtSecurities, ci:UnobservableInputsDevelopedByCompany



Period End2020-03-312019-12-31
Value0.2330.093
Percentage of LiquidityAdjustmentUsedInPricingLevel3SecuritiesDirectlyDevelopedByCompanyBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

srt:Maximum, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, us-gaap:AssetBackedSecurities, ci:UnobservableInputsDevelopedByCompany



Period End2020-03-312019-12-31
Value0.0350.037
Percentage of LiquidityAdjustmentUsedInPricingLevel3SecuritiesDirectlyDevelopedByCompanyBeforeReclassificationToDisposalGroupAssetsHeldForSale15.039.8

srt:WeightedAverage, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, ci:CorporateAndGovernmentDebtSecurities, ci:UnobservableInputsDevelopedByCompany



Period End2020-03-312019-12-31
Value0.0370.028
Percentage of LiquidityAdjustmentUsedInPricingLevel3SecuritiesDirectlyDevelopedByCompanyBeforeReclassificationToDisposalGroupAssetsHeldForSale15.930.1

srt:WeightedAverage, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, us-gaap:AssetBackedSecurities, ci:UnobservableInputsDevelopedByCompany



Period End2020-03-312019-12-31
Value0.0120.007
Percentage of LiquidityAdjustmentUsedInPricingLevel3SecuritiesDirectlyDevelopedByCompanyBeforeReclassificationToDisposalGroupAssetsHeldForSale5.27.5

ci:LongTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale



Period End2020-03-312019-12-31
Value2792028837
Percentage of LongTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

us-gaap:InvestmentType

us-gaap:DebtSecurities



Period End2020-03-312019-12-31
Value2155922827
Percentage of LongTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale77.279.2

us-gaap:EquitySecurities



Period End2020-03-312019-12-31
Value347303
Percentage of LongTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale1.21.1

us-gaap:Mortgages



Period End2020-03-312019-12-31
Value19351947
Percentage of LongTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale6.96.8

us-gaap:OtherLongTermInvestments



Period End2020-03-312019-12-31
Value27352403
Percentage of LongTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale9.88.3

us-gaap:PolicyLoans



Period End2020-03-312019-12-31
Value13441357
Percentage of LongTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale4.84.7

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

ci:MarketableSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, us-gaap:DebtSecurities



Period End2020-03-312019-12-31
Value751523
Percentage of MarketableSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:ValuationTechnique

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, ci:CorporateAndGovernmentDebtSecurities, ci:UnobservableInputsDevelopedByCompany



Period End2020-03-312019-12-31
Value582385
Percentage of MarketableSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale77.573.6

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, us-gaap:AssetBackedSecurities, ci:UnobservableInputsDevelopedByCompany



Period End2020-03-312019-12-31
Value167138
Percentage of MarketableSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale22.226.4

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, us-gaap:DebtSecurities, ci:UnobservableInputsNotDevelopedByCompany



Period End2020-03-312019-12-31
Value20
Percentage of MarketableSecuritiesBeforeReclassificationToDisposalGroupAssetsHeldForSale0.30.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

ci:MortgageLoansOnRealEstateCommercialAndConsumerNetBeforeReclassificationToDisposalGroupAssetsHeldForSale

us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-31
Value19581989
Percentage of MortgageLoansOnRealEstateCommercialAndConsumerNetBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-31
Value19351947
Percentage of MortgageLoansOnRealEstateCommercialAndConsumerNetBeforeReclassificationToDisposalGroupAssetsHeldForSale98.897.9

ci:NonGuaranteedSeparateAccountAssetsClassifiedInFairValueHierarchyBeforeReclassificationToDisposalGroupAssetsHeldForSale



Period End2020-03-312019-12-31
Value64487235
Percentage of NonGuaranteedSeparateAccountAssetsClassifiedInFairValueHierarchyBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1



Period End2020-03-312019-12-31
Value11601450
Percentage of NonGuaranteedSeparateAccountAssetsClassifiedInFairValueHierarchyBeforeReclassificationToDisposalGroupAssetsHeldForSale18.020.0

us-gaap:FairValueInputsLevel2



Period End2020-03-312019-12-31
Value49665522
Percentage of NonGuaranteedSeparateAccountAssetsClassifiedInFairValueHierarchyBeforeReclassificationToDisposalGroupAssetsHeldForSale77.076.3

us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-31
Value322263
Percentage of NonGuaranteedSeparateAccountAssetsClassifiedInFairValueHierarchyBeforeReclassificationToDisposalGroupAssetsHeldForSale5.03.6

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:RetirementPlanType

us-gaap:FairValueInputsLevel3, us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-31
Value300200
Percentage of NonGuaranteedSeparateAccountAssetsClassifiedInFairValueHierarchyBeforeReclassificationToDisposalGroupAssetsHeldForSale4.72.8

us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-31
Value35004000
Percentage of NonGuaranteedSeparateAccountAssetsClassifiedInFairValueHierarchyBeforeReclassificationToDisposalGroupAssetsHeldForSale54.355.3

ci:NonGuaranteedSeparateAccountAssetsPricedAtNetAssetValueAsAPracticalExpedientBeforeReclassificationToDisposalGroupAssetsHeldForSale



Period End2020-03-312019-12-31
Value742756
Percentage of NonGuaranteedSeparateAccountAssetsPricedAtNetAssetValueAsAPracticalExpedientBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

ci:NoninsuranceCustomerReceivablesExcludingPharmaceuticalManufacturersReceivable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value552251434891512146354988441
Percentage of NoninsuranceCustomerReceivablesExcludingPharmaceuticalManufacturersReceivable100.0100.0100.0100.0100.0100.0100.0

ci:OtherLongTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale



Period End2020-03-312019-12-31
Value27352403
Percentage of OtherLongTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

us-gaap:InvestmentType

srt:PartnershipInterest



Period End2020-03-312019-12-31
Value15171409
Percentage of OtherLongTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale55.558.6

us-gaap:OtherInvestments



Period End2020-03-312019-12-31
Value370206
Percentage of OtherLongTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale13.58.6

us-gaap:RealEstateInvestment



Period End2020-03-312019-12-31
Value848788
Percentage of OtherLongTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale31.032.8

ci:OtherShortTermDebtCurrentMaturitiesOfLongTermDebtAndLeaseObligationsCurrent



Period End2020-03-312019-12-31
Value2527
Percentage of OtherShortTermDebtCurrentMaturitiesOfLongTermDebtAndLeaseObligationsCurrent100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

ci:OtherShortTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-31
Value306423
Percentage of OtherShortTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-31
Value306423
Percentage of OtherShortTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

ci:PharmaceuticalManufacturerRebateNoninsuranceCustomer



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value222285330711624406336
Percentage of PharmaceuticalManufacturerRebateNoninsuranceCustomer100.0100.0100.0100.0100.0100.0100.0

ci:PharmaceuticalManufacturerReceivable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value363134393953401936823321645
Percentage of PharmaceuticalManufacturerReceivable100.0100.0100.0100.0100.0100.0100.0

ci:PharmacyAndServiceCostsPayable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value107971045410857113971114510702305
Percentage of PharmacyAndServiceCostsPayable100.0100.0100.0100.0100.0100.0100.0

ci:PolicyholderContractDepositsAttributableToDisposalGroups



Period End2020-03-312019-12-31
Value726717
Percentage of PolicyholderContractDepositsAttributableToDisposalGroups100.0100.0

ci:PolicyholderContractDepositsCurrentIncludingDisposalGroups



Period End2020-03-312019-12-31
Value613600
Percentage of PolicyholderContractDepositsCurrentIncludingDisposalGroups100.0100.0

ci:PolicyholderContractDepositsIncludingDisposalGroups



Period End2020-03-312019-12-31
Value76997739
Percentage of PolicyholderContractDepositsIncludingDisposalGroups100.0100.0

ci:PolicyholderContractDepositsNoncurrentIncludingDisposalGroups



Period End2020-03-312019-12-31
Value70867139
Percentage of PolicyholderContractDepositsNoncurrentIncludingDisposalGroups100.0100.0

ci:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization



Period End2020-03-312019-12-31
Value43174417
Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization100.0100.0

ci:ReceivablesNetCurrentIncludingDisposalGroups



Period End2020-03-312019-12-312018-12-31
Value123511123710473
Percentage of ReceivablesNetCurrentIncludingDisposalGroups100.0100.0100.0

us-gaap:StatementBusinessSegments

ci:ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustmentsIncludingDisposalGroups

ci:IntegratedMedical



Period End2020-03-312019-12-31
Value200303
Percentage of ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustmentsIncludingDisposalGroups100.0100.0

ci:InternationalMarketsGroupDisabilityAndLife



Period End2020-03-312019-12-31
Value178184
Percentage of ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustmentsIncludingDisposalGroups89.060.7

ci:ReinsuranceRecoverablesIncludingDisposalGroups



Period End2020-03-312019-12-31
Value54945495
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups100.0100.0

us-gaap:CededCreditRiskCollateralization

ci:CededCreditRiskSecuredCollateralProvisionsExistThatMayMitigateRisk



Period End2020-03-31
Value3711
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups67.5

ci:CededCreditRiskSecuredContractuallyRequiredFairValue



Period End2020-03-31
Value1364
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups24.8

us-gaap:CededCreditRiskUnsecured



Period End2020-03-31
Value419
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups7.6

us-gaap:ProductOrService

ci:AcquisitionDispositionRunoffActivities



Period End2020-03-312019-12-31
Value49904981
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups90.890.6

ci:OngoingOperations



Period End2020-03-31
Value504
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups9.2

us-gaap:ProductOrService, ci:CreditRatingNationallyRecognizedStatisticalRatingOrganizationNRSRO

ci:AcquisitionDispositionRunoffActivities, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSRONotRated



Period End2020-03-31
Value44
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups0.8

ci:OngoingOperations, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSROAOrHigher



Period End2020-03-31
Value316
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups5.8

ci:OngoingOperations, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSROBBBToBBBRating



Period End2020-03-31
Value63
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups1.1

ci:OngoingOperations, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSRONotRated



Period End2020-03-31
Value125
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups2.3

us-gaap:ProductOrService, us-gaap:CededCreditRisk, ci:CreditRatingNationallyRecognizedStatisticalRatingOrganizationNRSRO

ci:AcquisitionDispositionRunoffActivities, ci:BerkshireHathwayLifeInsuranceCompanyOfNebraska, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSROAOrHigher



Period End2020-03-31
Value829
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups15.1

ci:AcquisitionDispositionRunoffActivities, ci:LincolnNationalLifeInsuranceCompanyAndLincolnLifeAndAnnuityOfNewYork, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSROAOrHigher



Period End2020-03-31
Value3137
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups57.1

ci:AcquisitionDispositionRunoffActivities, ci:OtherReinsurers, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSROAOrHigher



Period End2020-03-31
Value288
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups5.2

ci:AcquisitionDispositionRunoffActivities, ci:PrudentialRetirementInsuranceAndAnnuityCompany, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSROAOrHigher



Period End2020-03-31
Value692
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups12.6

us-gaap:ProductOrService, us-gaap:CededCreditRisk, us-gaap:CededCreditRiskCollateralization, ci:CreditRatingNationallyRecognizedStatisticalRatingOrganizationNRSRO

ci:AcquisitionDispositionRunoffActivities, ci:BerkshireHathwayLifeInsuranceCompanyOfNebraska, ci:CededCreditRiskSecuredCollateralProvisionsExistThatMayMitigateRisk, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSROAOrHigher



Period End2020-03-31
Value492
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups9.0

ci:AcquisitionDispositionRunoffActivities, ci:BerkshireHathwayLifeInsuranceCompanyOfNebraska, ci:CededCreditRiskSecuredContractuallyRequiredFairValue, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSROAOrHigher



Period End2020-03-31
Value337
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups6.1

ci:AcquisitionDispositionRunoffActivities, ci:BerkshireHathwayLifeInsuranceCompanyOfNebraska, us-gaap:CededCreditRiskUnsecured, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSROAOrHigher



Period End2020-03-31
Value0.0
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups0.0

ci:AcquisitionDispositionRunoffActivities, ci:LincolnNationalLifeInsuranceCompanyAndLincolnLifeAndAnnuityOfNewYork, ci:CededCreditRiskSecuredCollateralProvisionsExistThatMayMitigateRisk, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSROAOrHigher



Period End2020-03-31
Value3137
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups57.1

ci:AcquisitionDispositionRunoffActivities, ci:LincolnNationalLifeInsuranceCompanyAndLincolnLifeAndAnnuityOfNewYork, ci:CededCreditRiskSecuredContractuallyRequiredFairValue, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSROAOrHigher



Period End2020-03-31
Value0.0
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups0.0

ci:AcquisitionDispositionRunoffActivities, ci:LincolnNationalLifeInsuranceCompanyAndLincolnLifeAndAnnuityOfNewYork, us-gaap:CededCreditRiskUnsecured, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSROAOrHigher



Period End2020-03-31
Value0.0
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups0.0

ci:AcquisitionDispositionRunoffActivities, ci:OtherReinsurers, ci:CededCreditRiskSecuredCollateralProvisionsExistThatMayMitigateRisk, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSROAOrHigher



Period End2020-03-31
Value21
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups0.4

ci:AcquisitionDispositionRunoffActivities, ci:OtherReinsurers, ci:CededCreditRiskSecuredContractuallyRequiredFairValue, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSROAOrHigher



Period End2020-03-31
Value248
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups4.5

ci:AcquisitionDispositionRunoffActivities, ci:OtherReinsurers, us-gaap:CededCreditRiskUnsecured, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSROAOrHigher



Period End2020-03-31
Value19
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups0.3

ci:AcquisitionDispositionRunoffActivities, ci:PrudentialRetirementInsuranceAndAnnuityCompany, ci:CededCreditRiskSecuredCollateralProvisionsExistThatMayMitigateRisk, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSROAOrHigher



Period End2020-03-31
Value0.0
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups0.0

ci:AcquisitionDispositionRunoffActivities, ci:PrudentialRetirementInsuranceAndAnnuityCompany, ci:CededCreditRiskSecuredContractuallyRequiredFairValue, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSROAOrHigher



Period End2020-03-31
Value692
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups12.6

ci:AcquisitionDispositionRunoffActivities, ci:PrudentialRetirementInsuranceAndAnnuityCompany, us-gaap:CededCreditRiskUnsecured, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSROAOrHigher



Period End2020-03-31
Value0.0
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups0.0

us-gaap:ProductOrService, us-gaap:CededCreditRiskCollateralization

ci:AcquisitionDispositionRunoffActivities, ci:CededCreditRiskSecuredCollateralProvisionsExistThatMayMitigateRisk



Period End2020-03-31
Value3690
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups67.2

ci:AcquisitionDispositionRunoffActivities, ci:CededCreditRiskSecuredContractuallyRequiredFairValue



Period End2020-03-31
Value1277
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups23.2

ci:AcquisitionDispositionRunoffActivities, us-gaap:CededCreditRiskUnsecured



Period End2020-03-31
Value23
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups0.4

ci:OngoingOperations, ci:CededCreditRiskSecuredCollateralProvisionsExistThatMayMitigateRisk



Period End2020-03-31
Value21
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups0.4

ci:OngoingOperations, ci:CededCreditRiskSecuredContractuallyRequiredFairValue



Period End2020-03-31
Value87
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups1.6

ci:OngoingOperations, us-gaap:CededCreditRiskUnsecured



Period End2020-03-31
Value396
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups7.2

us-gaap:ProductOrService, us-gaap:CededCreditRiskCollateralization, ci:CreditRatingNationallyRecognizedStatisticalRatingOrganizationNRSRO

ci:AcquisitionDispositionRunoffActivities, ci:CededCreditRiskSecuredCollateralProvisionsExistThatMayMitigateRisk, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSRONotRated



Period End2020-03-31
Value40
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups0.7

ci:AcquisitionDispositionRunoffActivities, ci:CededCreditRiskSecuredContractuallyRequiredFairValue, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSRONotRated



Period End2020-03-31
Value0.0
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups0.0

ci:AcquisitionDispositionRunoffActivities, us-gaap:CededCreditRiskUnsecured, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSRONotRated



Period End2020-03-31
Value4
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups0.1

ci:OngoingOperations, ci:CededCreditRiskSecuredCollateralProvisionsExistThatMayMitigateRisk, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSROAOrHigher



Period End2020-03-31
Value6
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups0.1

ci:OngoingOperations, ci:CededCreditRiskSecuredCollateralProvisionsExistThatMayMitigateRisk, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSROBBBToBBBRating



Period End2020-03-31
Value0.0
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups0.0

ci:OngoingOperations, ci:CededCreditRiskSecuredCollateralProvisionsExistThatMayMitigateRisk, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSRONotRated



Period End2020-03-31
Value15
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups0.3

ci:OngoingOperations, ci:CededCreditRiskSecuredContractuallyRequiredFairValue, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSROAOrHigher



Period End2020-03-31
Value0.0
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups0.0

ci:OngoingOperations, ci:CededCreditRiskSecuredContractuallyRequiredFairValue, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSROBBBToBBBRating



Period End2020-03-31
Value0.0
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups0.0

ci:OngoingOperations, ci:CededCreditRiskSecuredContractuallyRequiredFairValue, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSRONotRated



Period End2020-03-31
Value87
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups1.6

ci:OngoingOperations, us-gaap:CededCreditRiskUnsecured, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSROAOrHigher



Period End2020-03-31
Value310
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups5.6

ci:OngoingOperations, us-gaap:CededCreditRiskUnsecured, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSROBBBToBBBRating



Period End2020-03-31
Value63
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups1.1

ci:OngoingOperations, us-gaap:CededCreditRiskUnsecured, ci:NationallyRecognizedStatisicalRatingOrganizationsNRSRONotRated



Period End2020-03-31
Value23
Percentage of ReinsuranceRecoverablesIncludingDisposalGroups0.4

us-gaap:BalanceSheetLocation

ci:ReinsuranceRecoverablesNet

us-gaap:OtherCurrentAssets



Period End2020-03-312019-12-31
Value238222
Percentage of ReinsuranceRecoverablesNet100.0100.0

ci:ReinsuranceRecoverablesNonCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value5047510052745324538555075763
Percentage of ReinsuranceRecoverablesNonCurrent100.0100.0100.0100.0100.0100.0100.0

ci:SeparateAccountAssetsBeforeReclassificationToDisposalGroupAssetsHeldForSale



Period End2020-03-312019-12-31
Value76528481
Percentage of SeparateAccountAssetsBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

ci:SeparateAccountAssetsClassifiedInFairValueHierarchyBeforeReclassificationToDisposalGroupAssetsHeldForSale



Period End2020-03-312019-12-31
Value69107725
Percentage of SeparateAccountAssetsClassifiedInFairValueHierarchyBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1



Period End2020-03-312019-12-31
Value13571669
Percentage of SeparateAccountAssetsClassifiedInFairValueHierarchyBeforeReclassificationToDisposalGroupAssetsHeldForSale19.621.6

us-gaap:FairValueInputsLevel2



Period End2020-03-312019-12-31
Value52315793
Percentage of SeparateAccountAssetsClassifiedInFairValueHierarchyBeforeReclassificationToDisposalGroupAssetsHeldForSale75.775.0

us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-31
Value322263
Percentage of SeparateAccountAssetsClassifiedInFairValueHierarchyBeforeReclassificationToDisposalGroupAssetsHeldForSale4.73.4

ci:ShortTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale



Period End2020-03-312019-12-31
Value13201351
Percentage of ShortTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

us-gaap:InvestmentType

us-gaap:DebtSecurities



Period End2020-03-312019-12-31
Value1014928
Percentage of ShortTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale76.868.7

us-gaap:ShortTermInvestments



Period End2020-03-312019-12-31
Value306423
Percentage of ShortTermInvestmentsBeforeReclassificationToDisposalGroupAssetsHeldForSale23.231.3

ci:UnearnedPremiumsCurrentIncludingDisposalGroups



Period End2020-03-312019-12-31
Value480453
Percentage of UnearnedPremiumsCurrentIncludingDisposalGroups100.0100.0

ci:UnearnedPremiumsIncludingDisposalGroups



Period End2020-03-312019-12-31
Value840813
Percentage of UnearnedPremiumsIncludingDisposalGroups100.0100.0

us-gaap:Range, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:ValuationTechnique

ci:WeightingOfCreditSpreadsAdjustmentUsedInPricingLevel3SecuritiesDirectlyDevelopedByCompanyBeforeReclassificationToDisposalGroupAssetsHeldForSale

srt:Maximum, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, us-gaap:AssetBackedSecurities, ci:UnobservableInputsDevelopedByCompany



Period End2020-03-312019-12-31
Value0.0580.046
Percentage of WeightingOfCreditSpreadsAdjustmentUsedInPricingLevel3SecuritiesDirectlyDevelopedByCompanyBeforeReclassificationToDisposalGroupAssetsHeldForSale100.0100.0

srt:Minimum, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, us-gaap:AssetBackedSecurities, ci:UnobservableInputsDevelopedByCompany



Period End2020-03-312019-12-31
Value0.0350.024
Percentage of WeightingOfCreditSpreadsAdjustmentUsedInPricingLevel3SecuritiesDirectlyDevelopedByCompanyBeforeReclassificationToDisposalGroupAssetsHeldForSale60.352.2

srt:WeightedAverage, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, us-gaap:AssetBackedSecurities, ci:UnobservableInputsDevelopedByCompany



Period End2020-03-312019-12-31
Value0.0440.033
Percentage of WeightingOfCreditSpreadsAdjustmentUsedInPricingLevel3SecuritiesDirectlyDevelopedByCompanyBeforeReclassificationToDisposalGroupAssetsHeldForSale75.971.7

us-gaap:AccountsAndOtherReceivablesNetCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value359334442416363276251
Percentage of AccountsAndOtherReceivablesNetCurrent100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdditionalPaidInCapitalCommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value2855428306281152789127855277512940
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent



Period End2020-03-312020-01-01
Value6139
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0

us-gaap:UnusualOrInfrequentItem

ci:COVID19Pandemic



Period End2020-03-31
Value13
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent21.3

us-gaap:FinancialInstrument, ci:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:AssetsNet

us-gaap:AssetBackedSecurities, us-gaap:VariableInterestEntityNotPrimaryBeneficiary



Period End2020-03-31
Value600
Percentage of AssetsNet100.0

us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent



Period End2020-03-312019-12-312018-12-31
Value941995120
Percentage of AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent100.0100.00.0

us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperations, ci:GroupDisabilityAndLife



Period End2020-03-312019-12-31
Value94199512
Percentage of AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDisposalGroupIncludingDiscontinuedOperations



Period End2020-03-312019-12-312019-03-312018-12-312017-12-31
Value597743000
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDisposalGroupIncludingDiscontinuedOperations100.0100.00.00.00.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations



Period End2020-03-312019-12-312019-03-312018-12-312017-12-312016-12-31
Value517454114976385529723185
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations100.0100.0100.0100.0100.0100.0

us-gaap:CommercialPaper



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value77094411409905581500100
Percentage of CommercialPaper100.0100.0100.0100.0100.0100.0100.0

us-gaap:CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption



Period End2020-01-012019-01-012018-01-01
Value-30-1558
Percentage of CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:Parent



Period End2020-01-012019-01-012018-01-01
Value-30-1558
Percentage of CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption100.0100.0100.0

us-gaap:RetainedEarnings



Period End2020-01-012019-01-012018-01-01
Value-30-1568
Percentage of CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption100.0100.0117.2

us-gaap:DebtInstrument

us-gaap:DebtInstrumentFaceAmount

ci:NotesDue20204125Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value349349500500500500
Percentage of DebtInstrumentFaceAmount100.0100.0100.0100.0100.0100.0

ci:NotesDue2021475Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value28912481250125012501250
Percentage of DebtInstrumentFaceAmount82.8357.6250.0250.0250.0250.0

ci:NotesDue202239Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value9739991000100010001000
Percentage of DebtInstrumentFaceAmount278.8286.2200.0200.0200.0200.0

ci:NotesDue20224Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value277750750750750750750
Percentage of DebtInstrumentFaceAmount79.4214.9150.0150.0150.0150.00.0

ci:NotesDue2023375Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value218731003100310031003100
Percentage of DebtInstrumentFaceAmount626.6888.3620.0620.0620.0620.0

ci:NotesDue2023765Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value63100100100100100100
Percentage of DebtInstrumentFaceAmount18.128.720.020.020.020.00.0

ci:NotesDue203024Interest



Period End2020-03-31
Value1500
Percentage of DebtInstrumentFaceAmount429.8

ci:NotesDue2036615Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value190190191191191191191
Percentage of DebtInstrumentFaceAmount54.454.438.238.238.238.20.0

ci:NotesDue204032Interest



Period End2020-03-31
Value750
Percentage of DebtInstrumentFaceAmount214.9

ci:NotesDue20416125Interest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value448449449449449449
Percentage of DebtInstrumentFaceAmount128.4128.789.889.889.889.8

ci:NotesDue205034Interest



Period End2020-03-31
Value1250
Percentage of DebtInstrumentFaceAmount358.2

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

ci:A240LongTermDebtDueMarch152030, us-gaap:SeniorNotes



Period End2020-03-16
Value1500
Percentage of DebtInstrumentFaceAmount0.0

ci:A320LongTermDebtDueMarch152040, us-gaap:SeniorNotes



Period End2020-03-16
Value750
Percentage of DebtInstrumentFaceAmount0.0

ci:A340LongTermDebtDueMarch152050, us-gaap:SeniorNotes



Period End2020-03-16
Value1250
Percentage of DebtInstrumentFaceAmount0.0

us-gaap:DebtInstrument, us-gaap:ShortTermDebtType, us-gaap:SubsequentEventType

ci:A364DayTermLoan, us-gaap:LineOfCredit, us-gaap:SubsequentEvent



Period End2020-04-01
Value1400
Percentage of DebtInstrumentFaceAmount0.0

us-gaap:LongtermDebtType

us-gaap:SeniorNotes



Period End2020-03-16
Value3500
Percentage of DebtInstrumentFaceAmount0.0

us-gaap:DebtInstrumentRepurchasedFaceAmount



Period End2020-03-31
Value3200
Percentage of DebtInstrumentRepurchasedFaceAmount100.0

us-gaap:SubsequentEventType

us-gaap:SubsequentEvent



Period End2020-04-15
Value289
Percentage of DebtInstrumentRepurchasedFaceAmount0.0

us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLoss

ci:CorporateDebtSecuritiesWithRecordedAllowance



Period End2020-03-31
Value55
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLoss100.0

us-gaap:DeferredIncomeTaxLiabilitiesNet



Period End2020-03-312019-12-312018-12-31
Value906693879453
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0

us-gaap:DeferredPolicyAcquisitionCosts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value2959295827952821281728212237
Percentage of DeferredPolicyAcquisitionCosts100.0100.0100.0100.0100.0100.0100.0

us-gaap:CededCreditRisk, us-gaap:GuaranteedInsuranceContractTypeOfBenefit

us-gaap:DerivativeAssets

ci:BerkshireHathwayLifeInsuranceCompanyOfNebraska, us-gaap:GuaranteedMinimumIncomeBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value429332376355339341359
Percentage of DerivativeAssets100.0100.0100.0100.0100.0100.0100.0

ci:LibertyMutualInsurance, us-gaap:GuaranteedMinimumIncomeBenefit



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value233179202191184
Percentage of DerivativeAssets54.353.953.753.854.0

ci:SunLifeAssuranceCompanyOfCanada, us-gaap:GuaranteedMinimumIncomeBenefit



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value264202230216208
Percentage of DerivativeAssets61.560.861.260.861.0

us-gaap:GuaranteedInsuranceContractTypeOfBenefit

us-gaap:GuaranteedMinimumIncomeBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value926713808762728733777
Percentage of DerivativeAssets215.9214.8214.9214.6214.7215.0216.4

us-gaap:GuaranteedInsuranceContractTypeOfBenefit

us-gaap:DerivativeLiabilities

us-gaap:GuaranteedMinimumIncomeBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value882688781736700706
Percentage of DerivativeLiabilities100.0100.0100.0100.0100.0100.0

us-gaap:DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet



Period End2020-03-312019-12-31
Value616521
Percentage of DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet100.0100.0

us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperations, ci:GroupDisabilityAndLife



Period End2020-03-312019-12-31
Value616521
Percentage of DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet100.0100.0

us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents

us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperations, ci:GroupDisabilityAndLife



Period End2020-03-312019-12-31
Value597743
Percentage of DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents100.0100.0

us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets

us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperations, ci:GroupDisabilityAndLife



Period End2020-03-312019-12-31
Value547539
Percentage of DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets100.0100.0

us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities

us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperations, ci:GroupDisabilityAndLife



Period End2020-03-312019-12-31
Value602504
Percentage of DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities100.0100.0

us-gaap:FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value575656575857
Percentage of FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByAssetClass

ci:SeparateAccountAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value302320349360351308
Percentage of FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments529.8571.4623.2631.6605.2540.4

us-gaap:FairValueByAssetClass, us-gaap:InvestmentType

ci:SeparateAccountAssets, srt:PartnershipInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value302320349360351308
Percentage of FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments529.8571.4623.2631.6605.2540.4

us-gaap:FinanceLeaseLiability



Period End2020-03-312019-12-312019-09-302019-06-30
Value83888792
Percentage of FinanceLeaseLiability100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value2527232221117
Percentage of FinanceLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value586164706832
Percentage of FinanceLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseRightOfUseAsset



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value8187889391
Percentage of FinanceLeaseRightOfUseAsset100.0100.0100.0100.0100.0

ci:CumulativeEffectPeriodOfAdoption

us-gaap:FinancingReceivableAllowanceForCreditLosses

ci:CumulativeEffectPeriodOfAdoptionAdjustment



Period End2020-01-01
Value7
Percentage of FinancingReceivableAllowanceForCreditLosses100.0

us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:CommercialPortfolioSegment, us-gaap:RealEstateLoan



Period End2020-03-31
Value7
Percentage of FinancingReceivableAllowanceForCreditLosses0.0

us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableRecordedInvestmentCurrent

us-gaap:CommercialPortfolioSegment, us-gaap:RealEstateLoan



Period End2020-03-312019-12-31
Value19351947
Percentage of FinancingReceivableRecordedInvestmentCurrent100.0100.0

us-gaap:GainContingenciesByNature, us-gaap:SubsequentEventType

us-gaap:GainContingencyUnrecordedAmount

ci:CollectibilityOfCostSharingReductionCSRReceivable, us-gaap:SubsequentEvent



Period End2020-05-07
Value195
Percentage of GainContingencyUnrecordedAmount100.0

ci:CollectibilityOfRiskCorridorPaymentsReceivable, us-gaap:SubsequentEvent



Period End2020-05-07
Value120
Percentage of GainContingencyUnrecordedAmount61.5

us-gaap:Investments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value21581224793027529845289192897428619
Percentage of Investments100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent



Period End2020-03-312019-12-312018-12-31
Value704368120
Percentage of LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent100.0100.00.0

us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperations, ci:GroupDisabilityAndLife



Period End2020-03-312019-12-31
Value70436812
Percentage of LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent100.0100.0

us-gaap:LongTermDebtAndCapitalLeaseObligations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value3214731893340413688537571395235199
Percentage of LongTermDebtAndCapitalLeaseObligations100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:LongTermDebtFairValue

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value3813439439401034023741027408195730
Percentage of LongTermDebtFairValue100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value3563436375375263811339840408295321
Percentage of LongTermDebtFairValue93.492.293.694.797.1100.092.9

us-gaap:ProductOrService, us-gaap:LossContingenciesByNatureOfContingency

us-gaap:LossContingencyAccrualAtCarryingValue

ci:PharmacyBenefitsManagementServices, us-gaap:PerformanceGuarantee



Period End2020-03-312019-12-312018-12-31
Value12001000895
Percentage of LossContingencyAccrualAtCarryingValue100.0100.0100.0

us-gaap:ProductOrService, us-gaap:GuaranteedInsuranceContractTypeOfBenefit

us-gaap:NetAmountAtRiskByProductAndGuaranteeGeneralAccountValue

us-gaap:VariableAnnuity, us-gaap:GuaranteedMinimumDeathBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value74909110880490098996840210109
Percentage of NetAmountAtRiskByProductAndGuaranteeGeneralAccountValue100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService, us-gaap:GuaranteedInsuranceContractTypeOfBenefit

us-gaap:NetAmountAtRiskByProductAndGuaranteeNetAmountAtRisk

us-gaap:VariableAnnuity, us-gaap:GuaranteedMinimumDeathBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value2422176418481873194324662112
Percentage of NetAmountAtRiskByProductAndGuaranteeNetAmountAtRisk100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseLiability



Period End2020-03-312019-12-312019-09-302019-06-30
Value610631657675
Percentage of OperatingLeaseLiability100.0100.0100.0100.0

us-gaap:OperatingLeaseLiabilityCurrent



Period End2020-03-312019-12-31
Value165166
Percentage of OperatingLeaseLiabilityCurrent100.0100.0

us-gaap:OperatingLeaseLiabilityNoncurrent



Period End2020-03-312019-12-31
Value445465
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0

us-gaap:OtherLongTermDebtNoncurrent



Period End2020-03-312019-12-31
Value5861
Percentage of OtherLongTermDebtNoncurrent100.0100.0

us-gaap:RedeemableNoncontrollingInterestEquityCarryingAmount



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value35353431383749
Percentage of RedeemableNoncontrollingInterestEquityCarryingAmount100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReinsuranceRecoverablesAllowance



Period End2020-03-31
Value34
Percentage of ReinsuranceRecoverablesAllowance100.0

ci:CumulativeEffectPeriodOfAdoption

ci:CumulativeEffectPeriodOfAdoptionAdjustment



Period End2020-01-01
Value31
Percentage of ReinsuranceRecoverablesAllowance0.0

us-gaap:BalanceSheetLocation

us-gaap:RestrictedCashNoncurrent

us-gaap:OtherLongTermInvestments



Period End2020-03-31
Value125
Percentage of RestrictedCashNoncurrent100.0

us-gaap:SeparateAccountAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value7640846583338345807978398423
Percentage of SeparateAccountAssets100.0100.0100.0100.0100.0100.0100.0

us-gaap:SeparateAccountsLiability



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value7640846583338345807978398423
Percentage of SeparateAccountsLiability100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value450864534444699438184241341035155551474314195137111370312020
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:StatementEquityComponents, ci:CumulativeEffectPeriodOfAdoption

us-gaap:CommercialPortfolioSegment, us-gaap:RealEstateLoan, us-gaap:RetainedEarnings, ci:CumulativeEffectPeriodOfAdoptionAdjustment



Period End2020-01-01
Value-7
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value-1527-941-858-965-1282-1711-1857-1843-1547-1082-1382-1250
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-3.4-2.1-1.9-2.2-3.0-4.2-11.9-12.5-10.9-7.9-10.1-10.4

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value285542830628115278912785527751298529742963294028922859
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest63.362.462.963.765.767.619.220.220.921.421.123.8

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value444444747474747474
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.00.00.00.00.00.00.50.50.50.50.50.6

us-gaap:NoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value763357000049
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.1

us-gaap:Parent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value450794533844696438154240841028155551474314195137111369912011
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.9

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value212982016219185178341642615088184741772216933158001383112097
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest47.244.542.940.738.736.8118.8120.2119.3115.2100.9100.6

us-gaap:TreasuryStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value-3250-2193-1750-949-595-104-4121-4184-4228-4021-1716-1769
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-7.2-4.8-3.9-2.2-1.4-0.3-26.5-28.4-29.8-29.3-12.5-14.7

us-gaap:StatementEquityComponents, ci:CumulativeEffectPeriodOfAdoption

us-gaap:RetainedEarnings, ci:CumulativeEffectPeriodOfAdoptionAdjustment



Period End2020-01-01
Value-30
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.0

us-gaap:TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value353534313837303949495869
Percentage of TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStockShares



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312017-12-312016-12-31
Value1813103000
Percentage of TreasuryStockShares100.0100.0100.0100.0100.00.00.0

us-gaap:FinancialInstrument, ci:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:VariableInterestEntityEntityMaximumLossExposureAmount

ci:SecuritiesLimitedPartnershipsAndRealEstateLimitedPartnerships, us-gaap:VariableInterestEntityNotPrimaryBeneficiary



Period End2020-03-31
Value3700
Percentage of VariableInterestEntityEntityMaximumLossExposureAmount100.0

us-gaap:AssetBackedSecurities, us-gaap:VariableInterestEntityNotPrimaryBeneficiary



Period End2020-03-31
Value600
Percentage of VariableInterestEntityEntityMaximumLossExposureAmount16.2

Line plots across dimensions of each concept

us-gaap:Revenues us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments


us-gaap:PremiumsEarnedNet us-gaap:ProductOrService


us-gaap:PremiumsEarnedNet us-gaap:ProductOrService, us-gaap:StatementBusinessSegments


us-gaap:NetInvestmentIncome us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments


us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments


us-gaap:StockholdersEquity us-gaap:StatementEquityComponents


us-gaap:LongTermDebtCurrent us-gaap:DebtInstrument


us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument


us-gaap:StockholdersEquity us-gaap:StatementEquityComponents


us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument


us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument, us-gaap:LongtermDebtType