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Commitments, contingencies, and guarantees Commitments, Contingencies, And Guarantees (Transactions accounted for as secured borrowings) (Details) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Document Period End Date Dec. 31, 2015  
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements $ 1,459  
Securities lending collateral 1,046 $ 1,330
Securities lending payable 1,047 $ 1,331
Cash and Cash Equivalents [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements 34  
Mortgage backed-securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements 1,188  
Repurchase Agreements [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Secured Borrowings, Gross, Difference, Amount 55  
U.S. Treasury and agency    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements 237  
Maturity Overnight [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Secured Borrowings, Gross, Difference, Amount (1)  
Maturity Overnight [Member] | Cash and Cash Equivalents [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending collateral 424  
Maturity Overnight [Member] | U.S. Treasury and agency    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending collateral 67  
Maturity Overnight [Member] | Foreign Government Debt [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending collateral 296  
Maturity Overnight [Member] | Corporate securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending collateral 2  
Maturity Overnight [Member] | Equity securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending collateral 257  
Maturity Less than 30 Days [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements 405  
Maturity Less than 30 Days [Member] | Cash and Cash Equivalents [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements 34  
Maturity Less than 30 Days [Member] | Mortgage backed-securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements 365  
Maturity Less than 30 Days [Member] | U.S. Treasury and agency    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements 6  
Maturity 30 to 90 Days [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements 480  
Maturity 30 to 90 Days [Member] | Cash and Cash Equivalents [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements 0  
Maturity 30 to 90 Days [Member] | Mortgage backed-securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements 480  
Maturity 30 to 90 Days [Member] | U.S. Treasury and agency    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements 0  
Maturity Greater than 90 Days [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements 574  
Maturity Greater than 90 Days [Member] | Cash and Cash Equivalents [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements 0  
Maturity Greater than 90 Days [Member] | Mortgage backed-securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements 343  
Maturity Greater than 90 Days [Member] | U.S. Treasury and agency    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements $ 231