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Contracts Accounted for as Credit Derivatives - Net Change in Fair Value of Credit Derivatives Gains (Losses) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Realized gains (losses) and other settlements $ 105 $ (1)
Net unrealized gains (losses) (1) 11
Fair value gains (losses) on credit derivatives $ 104 $ 10