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Derivatives and Hedging Activities - Summary of Information About CVA and FVA (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
CVA, net of hedges $ (49) $ 40 $ 121 $ 67
FVA, net of hedges 80 5 109 124
Total $ 31 $ 45 $ 230 $ 191