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Collateralized Agreements and Financings - Assets Pledged as Collateral (Detail) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Offsetting Liabilities [Line Items]
Trading assets (at fair value)	$ 652,585	$ 570,555
Investments	203,757	184,514
Loans	222,379	196,200
Other assets	35,592	34,187
Pledged to counterparties that had the right to deliver or repledge | Repurchase agreements
Offsetting Liabilities [Line Items]
Trading assets (at fair value)	159,299	148,417
Pledged to counterparties that did not have the right to deliver or repledge | Repurchase agreements
Offsetting Liabilities [Line Items]
Trading assets (at fair value)	176,414	173,254
Investments	18,939	8,712
Loans	12,274	12,065
Other assets	$ 844	$ 1,590

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