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Derivative Financial Instruments and Off-balance sheet Financial Instruments (Details 6)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
entity
Dec. 31, 2015
USD ($)
Derivative Financial Instruments and Off-balance sheet Financial Instruments    
Term of credit default swaps (in years) 5 years  
Credit Derivatives    
Notional amount $ 2,919 $ 3,259
The number of reference entities generally included in a CDX index | entity 125  
Credit default swaps    
Credit Derivatives    
Notional amount $ 180 180
Fair value (2) (7)
Credit default swaps | First-to-default Basket | Municipal    
Credit Derivatives    
Notional amount 100 100
Fair value (3) (8)
Credit default swaps | Index | Corporate debt    
Credit Derivatives    
Notional amount 80 80
Fair value 1 1
AA | Credit default swaps    
Credit Derivatives    
Notional amount 1 1
AA | Credit default swaps | First-to-default Basket | Municipal    
Credit Derivatives    
Notional amount 0 0
AA | Credit default swaps | Index | Corporate debt    
Credit Derivatives    
Notional amount 1 1
A | Credit default swaps    
Credit Derivatives    
Notional amount 19 20
A | Credit default swaps | First-to-default Basket | Municipal    
Credit Derivatives    
Notional amount 0 0
A | Credit default swaps | Index | Corporate debt    
Credit Derivatives    
Notional amount 19 20
BBB | Credit default swaps    
Credit Derivatives    
Notional amount 150 152
BBB | Credit default swaps | First-to-default Basket | Municipal    
Credit Derivatives    
Notional amount 100 100
BBB | Credit default swaps | Index | Corporate debt    
Credit Derivatives    
Notional amount 50 52
BB and lower | Credit default swaps    
Credit Derivatives    
Notional amount 10 7
BB and lower | Credit default swaps | First-to-default Basket | Municipal    
Credit Derivatives    
Notional amount 0 0
BB and lower | Credit default swaps | Index | Corporate debt    
Credit Derivatives    
Notional amount $ 10 $ 7