COMMISSIONS AND FEES; ADMINISTRATION AND OTHER FIDUCIARY FEES - Commissions and Fees Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Commissions and fees
Total commissions and fees	$ 2,888	$ 2,589	$ 8,340	$ 7,780
Investment Banking
Commissions and fees
Total commissions and fees	1,128	944	3,171	2,692
Brokerage Commissions
Commissions and fees
Total commissions and fees	730	653	2,135	1,895
Revenue recognized	46	43	137	129
Interchange fees
Commissions and fees
Total commissions and fees	3,055	2,946	8,930	8,772
Card-related loan fees
Commissions and fees
Total commissions and fees	187	162	529	439
Card rewards and partner payments
Commissions and fees
Total commissions and fees	(3,384)	(3,187)	(9,845)	(9,292)
Deposit-related fees
Commissions and fees
Total commissions and fees	352	324	1,018	1,005
Transactional service fees
Commissions and fees
Total commissions and fees	377	344	1,112	1,043
Corporate finance
Commissions and fees
Total commissions and fees	177	164	521	512
Insurance distribution revenue
Commissions and fees
Total commissions and fees	80	76	240	238
Insurance premiums
Commissions and fees
Total commissions and fees	23	23	76	72
Loan servicing
Commissions and fees
Total commissions and fees	21	19	68	54
Other
Commissions and fees
Total commissions and fees	142	121	385	350
Commissions and fees
Commissions and fees
Commissions and fees	$ (3,000)	$ (2,800)	$ (8,600)	$ (8,200)