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Deposits - Additional Information (Detail) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Deposit Liability [Line Items] |  |
Deposits at fair value | $ 83,146 | $ 44,855
U.S. |  |
Deposit Liability [Line Items] |  |
Time deposits, at or above FDIC insurance limit | 24,440 |
Non-U.S. |  |
Deposit Liability [Line Items] |  |
Time deposits, at or above FDIC insurance limit | $ 49,650 |

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