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Derivative Financial Instruments and Off-balance sheet Financial Instruments (Details 6)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
entity
Dec. 31, 2014
USD ($)
Derivative Financial Instruments and Off-balance sheet Financial Instruments    
Term of credit default swaps (in years) 5 years  
The number of reference entities generally included in a CDX index | entity 125  
Credit Derivatives    
Notional amount $ 4,977 $ 5,761
Credit default swaps    
Credit Derivatives    
Notional amount 255 305
Fair value (6) (6)
Credit default swaps | Single name | Corporate    
Credit Derivatives    
Notional amount 75 125
Fair value 1 1
Credit default swaps | First-to-default Basket | Municipal    
Credit Derivatives    
Notional amount 100 100
Fair value (8) (9)
Credit default swaps | Index | Corporate    
Credit Derivatives    
Notional amount 80 80
Fair value 1 2
AA | Credit default swaps    
Credit Derivatives    
Notional amount 21 20
AA | Credit default swaps | Single name | Corporate    
Credit Derivatives    
Notional amount 20 20
AA | Credit default swaps | First-to-default Basket | Municipal    
Credit Derivatives    
Notional amount 0 0
AA | Credit default swaps | Index | Corporate    
Credit Derivatives    
Notional amount 1 0
A | Credit default swaps    
Credit Derivatives    
Notional amount 30 137
A | Credit default swaps | Single name | Corporate    
Credit Derivatives    
Notional amount 10 15
A | Credit default swaps | First-to-default Basket | Municipal    
Credit Derivatives    
Notional amount 0 100
A | Credit default swaps | Index | Corporate    
Credit Derivatives    
Notional amount 20 22
BBB | Credit default swaps    
Credit Derivatives    
Notional amount 197 142
BBB | Credit default swaps | Single name | Corporate    
Credit Derivatives    
Notional amount 45 90
BBB | Credit default swaps | First-to-default Basket | Municipal    
Credit Derivatives    
Notional amount 100 0
BBB | Credit default swaps | Index | Corporate    
Credit Derivatives    
Notional amount 52 52
BB and lower | Credit default swaps    
Credit Derivatives    
Notional amount 7 6
BB and lower | Credit default swaps | Single name | Corporate    
Credit Derivatives    
Notional amount 0 0
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    
Credit Derivatives    
Notional amount $ 7 $ 6