PRINCIPAL TRANSACTIONS (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Principal transactions revenue
Principal transactions revenue	[1]	$ 2,772	$ 2,835	$ 8,785	$ 8,656
Interest rate risks
Principal transactions revenue
Principal transactions revenue		322	615	1,465	1,625
Foreign exchange risks
Principal transactions revenue
Principal transactions revenue		1,545	1,238	4,572	3,877
Equity risks
Principal transactions revenue
Principal transactions revenue		807	596	1,997	1,840
Equity risks | Visa
Principal transactions revenue
Principal transactions revenue					400
Commodity and other risks
Principal transactions revenue
Principal transactions revenue		219	383	850	1,007
Credit products and risks
Principal transactions revenue
Principal transactions revenue		$ (121)	$ 3	$ (99)	$ 307

[1] Effective July 1, 2025, gains and losses on certain economic and qualifying hedging derivatives and foreign currency transaction gains and losses related to non-U.S. dollar debt and certain foreign operations in countries with highly inflationary economies with the U.S. dollar as their functional currency, which were previously presented within Other revenue, are presented within Principal transactions. Prior periods were conformed to reflect this change in presentation.