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Investments (details) - Derivatives (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Derivatives      
Net realized investment gains (losses) $ 79us-gaap_RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments [1] $ 166us-gaap_RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments [1] $ 51us-gaap_RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments [1]
Maxiumum [Member]      
Derivatives      
Net realized investment gains (losses) related to embedded derivatives (1)us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 1us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 (1)us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Futures [Member] | U.S. Treasury notes contracts [Member]      
Derivatives      
Notional value of open contracts 350invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		  
Net realized investment gains (losses) $ (1)us-gaap_RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 $ 115us-gaap_RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 $ (14)us-gaap_RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
[1] Total other-than-temporary impairment (OTTI) gains (losses) were $(22) million, $(10) million and $27 million for the years ended December 31, 2014, 2013 and 2012, respectively. Of total OTTI, credit losses of $(26) million, $(15) million and $(15) million for the years ended December 31, 2014, 2013 and 2012 respectively, were recognized in net realized investment gains. In addition, unrealized gains from other changes in total OTTI of $4 million, $5 million and $42 million for the years ended December 31, 2014, 2013 and 2012, respectively, were recognized in other comprehensive income (loss) as part of changes in net unrealized gains on investment securities having credit losses recognized in the consolidated statement of income.