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Investments (Securities Lending - Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Amortized cost    
Securities Financing Transaction [Line Items]    
Securities Loaned $ 25,933us-gaap_SecuritiesLoaned
/ us-gaap_SecuritiesFinancingTransactionAxis
= us-gaap_SecuritiesFinancingTransactionCostMember		 $ 26,989us-gaap_SecuritiesLoaned
/ us-gaap_SecuritiesFinancingTransactionAxis
= us-gaap_SecuritiesFinancingTransactionCostMember
Estimated fair value    
Securities Financing Transaction [Line Items]    
Securities Loaned 29,358us-gaap_SecuritiesLoaned
/ us-gaap_SecuritiesFinancingTransactionAxis
= us-gaap_SecuritiesFinancingTransactionFairValueMember		 30,269us-gaap_SecuritiesLoaned
/ us-gaap_SecuritiesFinancingTransactionAxis
= us-gaap_SecuritiesFinancingTransactionFairValueMember
Reserve for Off-balance Sheet Activities [Member] | Amortized cost    
Securities Financing Transaction [Line Items]    
Securities Loaned 26us-gaap_SecuritiesLoaned
/ us-gaap_SecuritiesFinancingTransactionAxis
= us-gaap_SecuritiesFinancingTransactionCostMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ReserveForOffBalanceSheetActivitiesMember		  
Reserve for Off-balance Sheet Activities [Member] | Estimated fair value    
Securities Financing Transaction [Line Items]    
Securities Loaned $ 26us-gaap_SecuritiesLoaned
/ us-gaap_SecuritiesFinancingTransactionAxis
= us-gaap_SecuritiesFinancingTransactionFairValueMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ReserveForOffBalanceSheetActivitiesMember