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Derivative Financial Instruments (Details 6) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
entity
Dec. 31, 2012
Derivative Financial Instruments    
Term of credit default swaps (in years) 5 years  
Credit Derivatives    
Notional amount $ 7,679 $ 14,059
The number of reference entities generally included in a CDX index 125  
Credit default swaps
    
Credit Derivatives    
Notional amount 185 230
Fair value (15) (29)
Credit default swaps | Single name
    
Credit Derivatives    
Notional amount   30
Fair value   (3)
Credit default swaps | Single name | Investment grade corporate debt
    
Credit Derivatives    
Notional amount 5 5
Credit default swaps | Single name | Municipal
    
Credit Derivatives    
Notional amount   25
Fair value   (3)
Credit default swaps | First-to-default | Municipal
    
Credit Derivatives    
Notional amount 100 100
Fair value (16) (26)
Credit default swaps | Index | Investment grade corporate debt
    
Credit Derivatives    
Notional amount 80 100
Fair value 1  
AA | Credit default swaps
    
Credit Derivatives    
Notional amount 1 26
AA | Credit default swaps | Single name
    
Credit Derivatives    
Notional amount   25
AA | Credit default swaps | Single name | Municipal
    
Credit Derivatives    
Notional amount   25
AA | Credit default swaps | Index | Investment grade corporate debt
    
Credit Derivatives    
Notional amount 1 1
A | Credit default swaps
    
Credit Derivatives    
Notional amount 125 131
A | Credit default swaps | Single name
    
Credit Derivatives    
Notional amount   5
A | Credit default swaps | Single name | Investment grade corporate debt
    
Credit Derivatives    
Notional amount 5 5
A | Credit default swaps | First-to-default | Municipal
    
Credit Derivatives    
Notional amount 100 100
A | Credit default swaps | Index | Investment grade corporate debt
    
Credit Derivatives    
Notional amount 20 26
BBB | Credit default swaps
    
Credit Derivatives    
Notional amount 55 68
BBB | Credit default swaps | Index | Investment grade corporate debt
    
Credit Derivatives    
Notional amount 55 68
BB and lower | Credit default swaps
    
Credit Derivatives    
Notional amount 4 5
BB and lower | Credit default swaps | Index | Investment grade corporate debt
    
Credit Derivatives    
Notional amount $ 4 $ 5