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Collateralized Agreements and Financings - Financial Instruments Received as Collateral and Repledged (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Collateralized Agreements And Financings [Abstract]    
Collateral available to be delivered or repledged $ 1,274,525 $ 1,038,740
Collateral that was delivered or repledged $ 1,117,124 $ 912,863