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 |
12 Months Ended | |
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Dec. 31, 2025 |
Dec. 31, 2024 |
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| U.S. government and agency obligations | ||
| Concentration Risk [Line Items] | ||
| Concentration risk, credit risk, financial instrument, maximum exposure | $ 104,073 | $ 129,942 |
| Non-U.S. government and agency obligations | ||
| Concentration Risk [Line Items] | ||
| Concentration risk, credit risk, financial instrument, maximum exposure | $ 54,213 | $ 76,932 |
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- Definition Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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