Revenue and Expenses, Net Gains (Losses) from Trading Activities (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Net Gains (Losses) from Trading Activities [Line Items]
Total net gains (losses) from trading activities	$ 1,393	$ 1,376	$ 2,744	$ 2,760
Interest rate [Member]
Net Gains (Losses) from Trading Activities [Line Items]
Total net gains (losses) from trading activities	(804)	250	(240)	1,569
Commodity [Member]
Net Gains (Losses) from Trading Activities [Line Items]
Total net gains (losses) from trading activities	210	197	470	429
Equity [Member]
Net Gains (Losses) from Trading Activities [Line Items]
Total net gains (losses) from trading activities	379	128	827	469
Foreign exchange [Member]
Net Gains (Losses) from Trading Activities [Line Items]
Total net gains (losses) from trading activities	1,455	640	1,547	(43)
Credit [Member]
Net Gains (Losses) from Trading Activities [Line Items]
Total net gains (losses) from trading activities	$ 153	$ 161	$ 140	$ 336

Amount of gain (loss) resulting from the difference between the acquisition price and the selling price or fair value of trading assets and trading liabilities, conducted separately from customer trading activities. Includes, but is not limited to, changes in fair value of trading assets and trading liabilities.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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+ Details