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Investments - Declines in Fair Value, Fixed Maturities (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Debt Securities [Member] | Investment Grade [Member]  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]  
Available-for-sale Securities, Continuous Unrealized Loss Position, One Year or Less, Fair Value $ 695us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ ci_InvestmentsCreditRatingAxis
= ci_InvestmentGradeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Available For Sale Securities, Continuous Unrealized Loss Position, Twelve Months Or Longer, Fair Value 146us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ ci_InvestmentsCreditRatingAxis
= ci_InvestmentGradeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Available For Sale Securities, Continuous Unrealized Loss Position, One Year or Less, Amortized Cost 712ci_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAmortizedCost
/ ci_InvestmentsCreditRatingAxis
= ci_InvestmentGradeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Available-for-sale Securities, Continuous Unrealized Loss Position, More Than One Year, Amortized Cost 151ci_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCost
/ ci_InvestmentsCreditRatingAxis
= ci_InvestmentGradeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Available-for-sale Securities, Continuous Unrealized Loss Position, One Year or Less, Accumulated Losses (17)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ ci_InvestmentsCreditRatingAxis
= ci_InvestmentGradeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Available-for-sale Securities, Continuous Unrealized Loss Position, More Than One Year, Accumulated Losses (5)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ ci_InvestmentsCreditRatingAxis
= ci_InvestmentGradeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Debt Securities [Member] | Investment Grade [Member] | One Year Or Less [Member]  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 139us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ ci_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAgingAxis
= ci_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsMember
/ ci_InvestmentsCreditRatingAxis
= ci_InvestmentGradeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Debt Securities [Member] | Investment Grade [Member] | More Than One Year [Member]  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 64us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ ci_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAgingAxis
= ci_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerMember
/ ci_InvestmentsCreditRatingAxis
= ci_InvestmentGradeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Debt Securities [Member] | Below Investment Grade [Member]  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]  
Available-for-sale Securities, Continuous Unrealized Loss Position, One Year or Less, Fair Value 245us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ ci_InvestmentsCreditRatingAxis
= ci_BelowInvestmentGradeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Available For Sale Securities, Continuous Unrealized Loss Position, Twelve Months Or Longer, Fair Value 76us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ ci_InvestmentsCreditRatingAxis
= ci_BelowInvestmentGradeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Available For Sale Securities, Continuous Unrealized Loss Position, One Year or Less, Amortized Cost 262ci_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAmortizedCost
/ ci_InvestmentsCreditRatingAxis
= ci_BelowInvestmentGradeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Available-for-sale Securities, Continuous Unrealized Loss Position, More Than One Year, Amortized Cost 84ci_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCost
/ ci_InvestmentsCreditRatingAxis
= ci_BelowInvestmentGradeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Available-for-sale Securities, Continuous Unrealized Loss Position, One Year or Less, Accumulated Losses (17)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ ci_InvestmentsCreditRatingAxis
= ci_BelowInvestmentGradeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Available-for-sale Securities, Continuous Unrealized Loss Position, More Than One Year, Accumulated Losses (8)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ ci_InvestmentsCreditRatingAxis
= ci_BelowInvestmentGradeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Debt Securities [Member] | Below Investment Grade [Member] | One Year Or Less [Member]  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 143us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ ci_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAgingAxis
= ci_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsMember
/ ci_InvestmentsCreditRatingAxis
= ci_BelowInvestmentGradeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Debt Securities [Member] | Below Investment Grade [Member] | More Than One Year [Member]  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 24us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ ci_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAgingAxis
= ci_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerMember
/ ci_InvestmentsCreditRatingAxis
= ci_BelowInvestmentGradeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Equity securities [Member]  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]  
Securities with a significant unrealized loss reflected in accumulated other comprehensive income $ 0ci_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember