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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Realized gains (losses) and other settlements $ 1 $ 0 $ 0 $ 1
Net unrealized gains (losses) 5 91 16 105
Fair value gains (losses) on credit derivatives $ 6 $ 91 $ 16 $ 106