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Derivative Financial Instruments and Off-balance sheet Financial Instruments - CDS notional amounts by credit rating (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
entity
Dec. 31, 2016
USD ($)
Derivative Financial Instruments and Off-balance sheet Financial Instruments    
Term of credit default swaps 5 years  
Credit Derivatives    
Notional amount $ 3,388 $ 3,776
The number of reference entities generally included in a CDX index | entity 125  
Credit default contracts    
Credit Derivatives    
Notional amount $ 105 245
Fair value 1 (1)
Credit default contracts | Single name | Corporate    
Credit Derivatives    
Notional amount 25 65
Fair value 0 1
Credit default contracts | First-to-default Basket | Municipal    
Credit Derivatives    
Notional amount   100
Fair value   (3)
Credit default contracts | Index | Corporate    
Credit Derivatives    
Notional amount 80 80
Fair value 1 1
AA | Credit default contracts    
Credit Derivatives    
Notional amount 1 21
AA | Credit default contracts | Single name | Corporate    
Credit Derivatives    
Notional amount 0 20
AA | Credit default contracts | First-to-default Basket | Municipal    
Credit Derivatives    
Notional amount   0
AA | Credit default contracts | Index | Corporate    
Credit Derivatives    
Notional amount 1 1
A | Credit default contracts    
Credit Derivatives    
Notional amount 29 29
A | Credit default contracts | Single name | Corporate    
Credit Derivatives    
Notional amount 10 10
A | Credit default contracts | First-to-default Basket | Municipal    
Credit Derivatives    
Notional amount   0
A | Credit default contracts | Index | Corporate    
Credit Derivatives    
Notional amount 19 19
BBB | Credit default contracts    
Credit Derivatives    
Notional amount 55 185
BBB | Credit default contracts | Single name | Corporate    
Credit Derivatives    
Notional amount 10 35
BBB | Credit default contracts | First-to-default Basket | Municipal    
Credit Derivatives    
Notional amount   100
BBB | Credit default contracts | Index | Corporate    
Credit Derivatives    
Notional amount 45 50
BB and lower | Credit default contracts    
Credit Derivatives    
Notional amount 20 10
BB and lower | Credit default contracts | Single name | Corporate    
Credit Derivatives    
Notional amount 5 0
BB and lower | Credit default contracts | First-to-default Basket | Municipal    
Credit Derivatives    
Notional amount   0
BB and lower | Credit default contracts | Index | Corporate    
Credit Derivatives    
Notional amount $ 15 $ 10