COMMISSIONS AND FEES; ADMINISTRATION AND OTHER FIDUCIARY FEES - Commissions and Fees Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Commissions and fees
Total commissions and fees	$ 2,707	$ 2,636
Investment Banking
Commissions and fees
Total commissions and fees	1,036	873
Brokerage Commissions
Commissions and fees
Total commissions and fees	704	619
Revenue recognized	114	108
Interchange fees
Commissions and fees
Total commissions and fees	2,837	2,823
Card-related loan fees
Commissions and fees
Total commissions and fees	163	130
Card rewards and partner payments
Commissions and fees
Total commissions and fees	(3,135)	(2,917)
Deposit-related fees
Commissions and fees
Total commissions and fees	328	340
Transactional service fees
Commissions and fees
Total commissions and fees	353	340
Corporate finance
Commissions and fees
Total commissions and fees	172	199
Insurance distribution revenue
Commissions and fees
Total commissions and fees	82	84
Insurance premiums
Commissions and fees
Total commissions and fees	23	25
Loan servicing
Commissions and fees
Total commissions and fees	24	14
Other
Commissions and fees
Total commissions and fees	120	106
Commissions and fees
Commissions and fees
Commissions and fees	$ (2,751)	$ (2,538)