Noninterest Revenue and Noninterest Expense - Principal Transactions (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Schedule of Noninterest revenue [Line Items]
Total revenue by instrument type	$ 7,987	$ 7,627
Private equity losses	0	(13)
Principal transactions	7,987	7,614
Interest rate
Schedule of Noninterest revenue [Line Items]
Total revenue by instrument type	1,095	1,358
Credit
Schedule of Noninterest revenue [Line Items]
Total revenue by instrument type	552	238
Foreign exchange
Schedule of Noninterest revenue [Line Items]
Total revenue by instrument type	1,315	1,376
Equity
Schedule of Noninterest revenue [Line Items]
Total revenue by instrument type	4,059	4,174
Commodity
Schedule of Noninterest revenue [Line Items]
Total revenue by instrument type	$ 966	$ 481