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Investments (Concentrations of Credit Risk - Narrative) (Details) (USD $)
In Billions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]      
Securities holdings exposure in single issuer greater than stated percentage of Company's equity 10.00%us-gaap_ConcentrationRiskPercentage1 10.00%us-gaap_ConcentrationRiskPercentage1  
Foreign government | Japan [Member]      
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]      
Government and agency fixed maturity securities 20.6us-gaap_FairValueConcentrationOfRiskInvestments
/ invest_InvestmentGeographicRegionAxis
= country_JP
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember		   $ 20.3us-gaap_FairValueConcentrationOfRiskInvestments
/ invest_InvestmentGeographicRegionAxis
= country_JP
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Fixed maturity and equity securities [Member] | Japan [Member]      
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]      
Government and agency fixed maturity securities 25.8us-gaap_FairValueConcentrationOfRiskInvestments
/ invest_InvestmentGeographicRegionAxis
= country_JP
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SecuritiesAssetsMember		   $ 25.5us-gaap_FairValueConcentrationOfRiskInvestments
/ invest_InvestmentGeographicRegionAxis
= country_JP
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SecuritiesAssetsMember