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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

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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

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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.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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