COMMISSIONS AND FEES; ADMINISTRATION AND OTHER FIDUCIARY FEES - Commissions and Fees Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Commissions and fees
Total commissions and fees	$ 2,745	$ 2,555	$ 5,452	$ 5,191
Investment Banking
Commissions and fees
Total commissions and fees	1,006	875	2,043	1,748
Brokerage Commissions
Commissions and fees
Total commissions and fees	701	622	1,405	1,241
Revenue recognized	45	44	91	86
Interchange fees
Commissions and fees
Total commissions and fees	3,038	3,003	5,876	5,826
Card-related loan fees
Commissions and fees
Total commissions and fees	179	147	342	277
Card rewards and partner payments
Commissions and fees
Total commissions and fees	(3,325)	(3,189)	(6,460)	(6,106)
Deposit-related fees
Commissions and fees
Total commissions and fees	338	341	666	681
Transactional service fees
Commissions and fees
Total commissions and fees	381	359	734	699
Corporate finance
Commissions and fees
Total commissions and fees	171	150	343	349
Insurance distribution revenue
Commissions and fees
Total commissions and fees	79	78	160	162
Insurance premiums
Commissions and fees
Total commissions and fees	30	24	53	49
Loan servicing
Commissions and fees
Total commissions and fees	23	22	47	35
Other
Commissions and fees
Total commissions and fees	124	123	243	230
Commissions and fees
Commissions and fees
Commissions and fees	$ (2,918)	$ (2,833)	$ (5,668)	$ (5,365)