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Credit Concentrations - U.S. Government and Agency Obligations and Non-U.S. Government and Agency Obligations that Collateralize Resale Agreements and Securities Borrowed Transactions (Detail) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
U.S. government and agency obligations |  |
Concentration Risk [Line Items] |  |
Concentration risk, credit risk, financial instrument, maximum exposure | $ 91,408 | $ 129,942
Non-U.S. government and agency obligations |  |
Concentration Risk [Line Items] |  |
Concentration risk, credit risk, financial instrument, maximum exposure | $ 66,672 | $ 76,932

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