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Contracts Accounted for as Credit Derivatives - CDS Spread and Components of Credit Derivative Assets (Liabilities) (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Credit Derivatives        
Fair value of credit derivatives before effect of AGC credit spread $ (223) $ (225)    
Plus: Effect of AGC credit spread 76 71    
Net fair value of credit derivatives $ (147) $ (154)    
Five-year CDS spread | AGC        
Credit Derivatives        
Quoted price of CDS contract (as a percent) 1.03% 0.49% 0.62% 1.32%
One-year CDS spread | AGC        
Credit Derivatives        
Quoted price of CDS contract (as a percent) 0.41% 0.16% 0.16% 0.36%