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Credit Concentrations - Credit Concentrations Included in Trading Cash Instruments and Investments (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 | $ 387,756 | $ 389,148
Concentration risk, credit risk, financial instrument, maximum exposure, as a percentage of total assets | 21.40% | 23.20%
Non-U.S. government and agency obligations |  |
Concentration Risk [Line Items] |  |
Concentration risk, credit risk, financial instrument, maximum exposure | $ 127,049 | $ 74,496
Concentration risk, credit risk, financial instrument, maximum exposure, as a percentage of total assets | 7.00% | 4.40%

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- Definition Reflects, as a percentage of total assets, the 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. + References No definition available. + Details
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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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-21 + Details
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