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Fair Value Hierarchy - Trading Cash Instruments, Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Trading cash instruments, fair value disclosure |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Net realized gains/(losses) | $ 65 | $ 22 | $ 101 | $ (40)
Net realized gains / (losses) on assets | 28 | 28 | 71 | 92
Net unrealized gains/(losses) | 37 | (6) | 30 | (52)
Trading cash instruments, fair value disclosure | Market making |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Net realized gains/(losses) | 43 | 8 | 47 | (1)
Trading cash instruments, fair value disclosure | Interest income |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Net realized gains/(losses) | 22 | 14 | 54 | 41
Trading cash instruments assets |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Net realized gains / (losses) on assets | 28 | 28 | 71 | 92
Net unrealized gains/(losses) | $ 37 | $ (6) | $ 30 | $ (52)

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