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Fair Value Measurements - Changes in Level 3 Financial Assets (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Fixed Maturities And Equity Securities [Member]    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance $ 857us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
$ 1,190us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
Gains (losses) included in shareholders' net income:    
GMIB fair value gain/(loss) 0ci_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisGmibAssetsGainLossIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
0ci_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisGmibAssetsGainLossIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
Other 13ci_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisOtherAssetGainLossIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
12ci_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisOtherAssetGainLossIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
Total gains (losses) included in shareholders' net income 13us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
12us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
Gains (losses) included in other comprehensive income 2us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
8us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
Gains (losses) required to adjust future policy benefits for settlement annuities 6ci_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossRequiredToAdjustFuturePolicyBenefits
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
[1] 22ci_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossRequiredToAdjustFuturePolicyBenefits
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
[1]
Purchases, issuances, settlements:    
Purchases 11us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
24us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
Sales (18)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
(24)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
Settlements (3)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
(61)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
Total purchases, sales, settlements (10)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
(61)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
Transfers into/(out of) Level 3:    
Transfers into Level 3 1us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
124us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
Transfers out of Level 3 (51)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
(97)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
Total transfers into/(out of) Level 3 (50)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
27us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
Ending Balance 818us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
1,198us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
Total gains (losses) included in income attributable to instruments held at the reporting date 0ci_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossAttributedToInstrumentsHeldIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
1ci_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossAttributedToInstrumentsHeldIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= ci_FixedMaturitiesAndEquitySecuritiesMember
Derivative Financial Instruments, Assets [Member] | Guaranteed Minimum Income Benefit [Member]    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance 953us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
751us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
Gains (losses) included in shareholders' net income:    
GMIB fair value gain/(loss) 27ci_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisGmibAssetsGainLossIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
77ci_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisGmibAssetsGainLossIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
Other (1)ci_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisOtherAssetGainLossIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
(1)ci_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisOtherAssetGainLossIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
Total gains (losses) included in shareholders' net income 26us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
76us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
Gains (losses) included in other comprehensive income 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
Gains (losses) required to adjust future policy benefits for settlement annuities 0ci_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossRequiredToAdjustFuturePolicyBenefits
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
[1] 0ci_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossRequiredToAdjustFuturePolicyBenefits
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
[1]
Purchases, issuances, settlements:    
Purchases 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
Sales 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
Settlements (9)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
(12)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
Total purchases, sales, settlements (9)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
(12)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
Transfers into/(out of) Level 3:    
Transfers into Level 3 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
Transfers out of Level 3 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
Total transfers into/(out of) Level 3 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
Ending Balance 970us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
815us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
Total gains (losses) included in income attributable to instruments held at the reporting date $ 26ci_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossAttributedToInstrumentsHeldIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
$ 76ci_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossAttributedToInstrumentsHeldIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
[1] Amounts do not accrue to shareholders.