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Investments (Fair Value of Trading Securities) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading Securities $ 2,065us-gaap_TradingSecurities $ 2,282us-gaap_TradingSecurities
Corporate bonds [Member] | Fixed maturity securities [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading Securities 1,528us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember		 1,738us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
Asset-backed Securities [Member] | Fixed maturity securities [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading Securities 32us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember		 33us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
U.S. government bonds [Member] | Fixed maturity securities [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading Securities 278us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_USGovernmentDebtSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember		 272us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_USGovernmentDebtSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
Foreign government bonds [Member] | Fixed maturity securities [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading Securities 25us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember		 24us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
RMBS [Member] | Fixed maturity securities [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading Securities 135us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember		 155us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
CMBS [Member] | Fixed maturity securities [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading Securities 4us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember		 7us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
CLOs [Member] | Fixed maturity securities [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading Securities 9us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_CollateralizedLoanObligationsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember		 2us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_CollateralizedLoanObligationsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
State and municipal bonds [Member] | Fixed maturity securities [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading Securities 22us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember		 21us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
Hybrid and redeemable preferred securities [Member] | Fixed maturity securities [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading Securities $ 32us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherDebtSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember		 $ 30us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherDebtSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember