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Trading Assets and Liabilities - Summary of Trading Assets and Liabilities (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Trading assets (at fair value) $ 652,585 $ 570,555
Trading liabilities 261,830 202,555
Trading cash instruments    
Trading assets (at fair value) 600,320 523,216
Trading liabilities 182,285 127,575
Derivatives    
Trading assets (at fair value) 52,265 47,339
Trading liabilities $ 79,545 $ 74,980