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Investments- Realized Capital Gains and Losses (Details 4) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Realized capital gains and losses by asset type    
Realized capital gains and losses $ 111us-gaap_RealizedInvestmentGainsLosses $ 0us-gaap_RealizedInvestmentGainsLosses
Fixed income securities    
Realized capital gains and losses by asset type    
Realized capital gains and losses 68us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeSecuritiesMember		 (5)us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeSecuritiesMember
Mortgage loans    
Realized capital gains and losses by asset type    
Realized capital gains and losses 0us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageLoansOnRealEstateMember		 3us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageLoansOnRealEstateMember
Equity securities    
Realized capital gains and losses by asset type    
Realized capital gains and losses 32us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		 2us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Limited partnership interests    
Realized capital gains and losses by asset type    
Realized capital gains and losses 4us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_PartnershipInterestMember		 (5)us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_PartnershipInterestMember
Derivatives    
Realized capital gains and losses by asset type    
Realized capital gains and losses 7us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DerivativeMember		 2us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DerivativeMember
Other    
Realized capital gains and losses by asset type    
Realized capital gains and losses $ 0us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherThanSecuritiesInvestmentMember		 $ 3us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherThanSecuritiesInvestmentMember