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Insurance (Obligations Under Funding Agreements - FHLB Common Stock) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Federal Home Loan Bank of New York [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Federal Home Loan Bank Stock $ 661us-gaap_FederalHomeLoanBankStock
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfNewYorkMember		 $ 700us-gaap_FederalHomeLoanBankStock
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfNewYorkMember
Federal Home Loan Bank of Boston [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Federal Home Loan Bank Stock 55us-gaap_FederalHomeLoanBankStock
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfBostonMember		 64us-gaap_FederalHomeLoanBankStock
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfBostonMember
Federal Home Loan Bank of Des Moines [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Federal Home Loan Bank Stock 66us-gaap_FederalHomeLoanBankStock
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfDesMoinesMember		 76us-gaap_FederalHomeLoanBankStock
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfDesMoinesMember
Federal Home Loan Bank of Pittsburgh [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Federal Home Loan Bank Stock $ 35us-gaap_FederalHomeLoanBankStock
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfPittsburghMember		 $ 30us-gaap_FederalHomeLoanBankStock
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfPittsburghMember