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Investment Income and Gains and Losses - Realized Investment Gains and Losses (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Realized Gains (Losses) on Investments [Line Items]      
Realized investment gains (losses) before income taxes $ 154ci_RealizedInvestmentGainLoss $ 213ci_RealizedInvestmentGainLoss $ 44ci_RealizedInvestmentGainLoss
Less income taxes (benefits) 48ci_RealizedInvestmentGainsLossesTaxes 72ci_RealizedInvestmentGainsLossesTaxes 13ci_RealizedInvestmentGainsLossesTaxes
Net realized investment gains (losses) 106ci_RealizedInvestmentGainsLossesNetOfTaxes 141ci_RealizedInvestmentGainsLossesNetOfTaxes 31ci_RealizedInvestmentGainsLossesNetOfTaxes
Impairments Table Details [Abstract]      
Credit-related (16)ci_ImpairmentsOnInvestmentsCreditRelated [1] (8)ci_ImpairmentsOnInvestmentsCreditRelated [1] (20)ci_ImpairmentsOnInvestmentsCreditRelated [1]
Other (36)ci_ImpairmentsOnInvestmentsOther (21)ci_ImpairmentsOnInvestmentsOther (2)ci_ImpairmentsOnInvestmentsOther
Total (52)ci_ImpairmentsOnInvestmentsTotal (29)ci_ImpairmentsOnInvestmentsTotal (22)ci_ImpairmentsOnInvestmentsTotal
Realized Investment Results Not Reflected In Revenues Table Details [Abstract]      
Separate accounts 376ci_RealizedInvestmentResultsNotReflectedInRevenuesSeparateAccounts 417ci_RealizedInvestmentResultsNotReflectedInRevenuesSeparateAccounts 206ci_RealizedInvestmentResultsNotReflectedInRevenuesSeparateAccounts
Investment gains required to adjust future policy benefits for the run-off settlement annuity business 86ci_RealizedInvestmentResultsNotReflectedInRevenuesRequiredToAdjustFuturePolicyBenefits 9ci_RealizedInvestmentResultsNotReflectedInRevenuesRequiredToAdjustFuturePolicyBenefits 21ci_RealizedInvestmentResultsNotReflectedInRevenuesRequiredToAdjustFuturePolicyBenefits
Sales Information For Available For Sale Fixed Maturities Equity Securities [Abstract]      
Proceeds from sales 1,769us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 1,775us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 591us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Gross gains on sales 62us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 102us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 37us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross losses on sales 6us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses 4us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses 2us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Fixed Maturities [Member]      
Realized Gains (Losses) on Investments [Line Items]      
Realized investment gains (losses) before income taxes 14ci_RealizedInvestmentGainLoss
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_DebtSecuritiesMember
113ci_RealizedInvestmentGainLoss
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_DebtSecuritiesMember
48ci_RealizedInvestmentGainLoss
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_DebtSecuritiesMember
Equity securities [Member]      
Realized Gains (Losses) on Investments [Line Items]      
Realized investment gains (losses) before income taxes 13ci_RealizedInvestmentGainLoss
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_EquitySecuritiesMember
8ci_RealizedInvestmentGainLoss
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_EquitySecuritiesMember
4ci_RealizedInvestmentGainLoss
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_EquitySecuritiesMember
Commercial Mortgage Loans [Member]      
Realized Gains (Losses) on Investments [Line Items]      
Realized investment gains (losses) before income taxes (6)ci_RealizedInvestmentGainLoss
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_MortgageLoansOnRealEstateMember
(3)ci_RealizedInvestmentGainLoss
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_MortgageLoansOnRealEstateMember
(9)ci_RealizedInvestmentGainLoss
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_MortgageLoansOnRealEstateMember
Other Investments Including Derivatives [Member]      
Realized Gains (Losses) on Investments [Line Items]      
Realized investment gains (losses) before income taxes $ 133ci_RealizedInvestmentGainLoss
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= ci_OtherInvestmentsIncludingDerivativesMember
$ 95ci_RealizedInvestmentGainLoss
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= ci_OtherInvestmentsIncludingDerivativesMember
$ 1ci_RealizedInvestmentGainLoss
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= ci_OtherInvestmentsIncludingDerivativesMember
[1] Credit-related losses include other-than-temporary declines in fair value of equity securities, increases in valuation reserves on commercial mortgage loans and asset write-downs related to investments in real estate entities.