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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, 2018
USD ($)
entity
Dec. 31, 2017
USD ($)
Derivative Financial Instruments and Off-balance sheet Financial Instruments    
Term of credit default swaps 5 years  
Credit Derivatives    
Notional amount $ 3,145 $ 3,388
The number of reference entities generally included in a CDX index | entity 125  
Credit default contracts    
Credit Derivatives    
Notional amount $ 5 105
Fair value 0 1
Credit default contracts | Single name | Corporate    
Credit Derivatives    
Notional amount 5 25
Fair value 0 0
Credit default contracts | Index | Corporate    
Credit Derivatives    
Notional amount   80
Fair value   1
AA | Credit default contracts    
Credit Derivatives    
Notional amount 0 1
AA | Credit default contracts | Single name | Corporate    
Credit Derivatives    
Notional amount 0 0
AA | Credit default contracts | Index | Corporate    
Credit Derivatives    
Notional amount   1
A | Credit default contracts    
Credit Derivatives    
Notional amount 0 29
A | Credit default contracts | Single name | Corporate    
Credit Derivatives    
Notional amount 0 10
A | Credit default contracts | Index | Corporate    
Credit Derivatives    
Notional amount   19
BBB | Credit default contracts    
Credit Derivatives    
Notional amount 0 55
BBB | Credit default contracts | Single name | Corporate    
Credit Derivatives    
Notional amount 0 10
BBB | Credit default contracts | Index | Corporate    
Credit Derivatives    
Notional amount   45
BB and lower | Credit default contracts    
Credit Derivatives    
Notional amount 5 20
BB and lower | Credit default contracts | Single name | Corporate    
Credit Derivatives    
Notional amount $ 5 5
BB and lower | Credit default contracts | Index | Corporate    
Credit Derivatives    
Notional amount   $ 15