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Investment Income and Gains and Losses - Realized Investment Gains and Losses (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Realized Gains (Losses) on Investments [Line Items]    
Realized investment gains (losses) before income taxes $ 73ci_RealizedInvestmentGainLoss $ 42ci_RealizedInvestmentGainLoss
Less income taxes (benefits) 25ci_RealizedInvestmentGainsLossesTaxes 15ci_RealizedInvestmentGainsLossesTaxes
Net realized investment gains (losses) 48ci_RealizedInvestmentGainsLossesNetOfTaxes 27ci_RealizedInvestmentGainsLossesNetOfTaxes
Impairments Table Details [Abstract]    
Credit-related (6)ci_ImpairmentsOnInvestmentsCreditRelated [1] (6)ci_ImpairmentsOnInvestmentsCreditRelated [1]
Other (5)ci_ImpairmentsOnInvestmentsOther 0ci_ImpairmentsOnInvestmentsOther
Total (11)ci_ImpairmentsOnInvestmentsTotal (6)ci_ImpairmentsOnInvestmentsTotal
Sales Information For Available For Sale Fixed Maturities Equity Securities [Abstract]    
Proceeds from sales 393us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 194us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Gross gains on sales 27us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 22us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross losses on sales 2us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses 0us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Fixed Maturities [Member]    
Realized Gains (Losses) on Investments [Line Items]    
Realized investment gains (losses) before income taxes 7ci_RealizedInvestmentGainLoss
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_DebtSecuritiesMember
8ci_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
17ci_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 5ci_RealizedInvestmentGainLoss
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_MortgageLoansOnRealEstateMember
0ci_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 $ 48ci_RealizedInvestmentGainLoss
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= ci_OtherInvestmentsIncludingDerivativesMember
$ 17ci_RealizedInvestmentGainLoss
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= ci_OtherInvestmentsIncludingDerivativesMember
[1] Credit-related losses are due to asset write-downs related to investments in real estate entities.