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Contracts Accounted for as Credit Derivatives - Net Change in Fair Value of Credit Derivatives Gains (Losses) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Realized gains (losses) and other settlements $ 2 $ (2) $ (3)
Net unrealized gains (losses) 112 (9) (55)
Fair value gains (losses) on credit derivatives $ 114 $ (11) $ (58)