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Segment Information - Segment Financial Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]    
Premiums $ 7,402us-gaap_PremiumsEarnedNet $ 6,676us-gaap_PremiumsEarnedNet
Fees and other revenues 1,138us-gaap_OtherIncome 1,006us-gaap_OtherIncome
Mail order pharmacy revenues 578us-gaap_SalesRevenueGoodsNet 495us-gaap_SalesRevenueGoodsNet
Net investment income 276us-gaap_NetInvestmentIncome 277us-gaap_NetInvestmentIncome
Realized investment gains (losses) 73ci_RealizedInvestmentGainLoss 42ci_RealizedInvestmentGainLoss
Total revenues 9,467us-gaap_Revenues 8,496us-gaap_Revenues
Depreciation and amortization 151us-gaap_DepreciationDepletionAndAmortization 150us-gaap_DepreciationDepletionAndAmortization
Income taxes 323us-gaap_IncomeTaxExpenseBenefit 324us-gaap_IncomeTaxExpenseBenefit
Shareholders' net income 533us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 528us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Realized Investment Gains    
Realized investment gains (losses) 73ci_RealizedInvestmentGainLoss 42ci_RealizedInvestmentGainLoss
Less income taxes (benefits) 25ci_RealizedInvestmentGainsLossesTaxes 15ci_RealizedInvestmentGainsLossesTaxes
Net realized investment gains (losses) $ 48ci_RealizedInvestmentGainsLossesNetOfTaxes $ 27ci_RealizedInvestmentGainsLossesNetOfTaxes