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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

X

- 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.

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