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Derivative Financial Instruments (Details 5)
$ in Millions
 6 Months Ended
Jun. 30, 2015
USD ($)
entity
Dec. 31, 2014
USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
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 $ 5,552 $ 5,761
Credit default contracts    
Credit Derivatives    
Notional amount 280 305
Fair value (6) (6)
Credit default contracts | Single name | Corporate debt    
Credit Derivatives    
Notional amount 100 125
Fair value 1 1
Credit default contracts | First-to-default Basket | Municipal    
Credit Derivatives    
Notional amount 100 100
Fair value (8) (9)
Credit default contracts | Index | Corporate debt    
Credit Derivatives    
Notional amount 80 80
Fair value 1 2
AA | Credit default contracts    
Credit Derivatives    
Notional amount 21 20
AA | Credit default contracts | Single name | Corporate debt    
Credit Derivatives    
Notional amount 20 20
AA | Credit default contracts | First-to-default Basket | Municipal    
Credit Derivatives    
Notional amount 0 0
AA | Credit default contracts | Index | Corporate debt    
Credit Derivatives    
Notional amount 1 0
A | Credit default contracts    
Credit Derivatives    
Notional amount 135 137
A | Credit default contracts | Single name | Corporate debt    
Credit Derivatives    
Notional amount 15 15
A | Credit default contracts | First-to-default Basket | Municipal    
Credit Derivatives    
Notional amount 100 100
A | Credit default contracts | Index | Corporate debt    
Credit Derivatives    
Notional amount 20 22
BBB | Credit default contracts    
Credit Derivatives    
Notional amount 117 142
BBB | Credit default contracts | Single name | Corporate debt    
Credit Derivatives    
Notional amount 65 90
BBB | Credit default contracts | First-to-default Basket | Municipal    
Credit Derivatives    
Notional amount 0 0
BBB | Credit default contracts | Index | Corporate debt    
Credit Derivatives    
Notional amount 52 52
BB and lower | Credit default contracts    
Credit Derivatives    
Notional amount 7 6
BB and lower | Credit default contracts | Single name | Corporate debt    
Credit Derivatives    
Notional amount 0 0
BB and lower | Credit default contracts | First-to-default Basket | Municipal    
Credit Derivatives    
Notional amount 0 0
BB and lower | Credit default contracts | Index | Corporate debt    
Credit Derivatives    
Notional amount $ 7 $ 6