Trading Assets and Liabilities - Summary of Market Making Revenues by Major Product Type (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Trading activity, gains and losses, net [Line Items]
Market making	$ 4,958	$ 4,641	$ 14,742	$ 15,583
Interest rates
Trading activity, gains and losses, net [Line Items]
Market making	(861)	(3,043)	713	(7,699)
Credit
Trading activity, gains and losses, net [Line Items]
Market making	511	(286)	1,160	1,379
Currencies
Trading activity, gains and losses, net [Line Items]
Market making	2,850	5,768	4,946	14,020
Equities
Trading activity, gains and losses, net [Line Items]
Market making	2,029	1,464	6,008	6,052
Commodities
Trading activity, gains and losses, net [Line Items]
Market making	$ 429	$ 738	$ 1,915	$ 1,831