COMMISSIONS AND FEES; ADMINISTRATION AND OTHER FIDUCIARY FEES - Commissions and Fees Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Commissions and fees
Total commissions and fees	$ 2,695	$ 2,195	$ 8,081	$ 6,693
Investment Banking
Commissions and fees
Total commissions and fees	944	694	2,692	2,018
Brokerage Commissions
Commissions and fees
Total commissions and fees	653	565	1,895	1,776
Revenue recognized	43	44	129	158
Interchange fees
Commissions and fees
Total commissions and fees	3,052	3,015	9,074	8,944
Card-related loan fees
Commissions and fees
Total commissions and fees	162	123	439	360
Card rewards and partner payments
Commissions and fees
Total commissions and fees	(3,187)	(3,159)	(9,292)	(9,284)
Deposit-related fees
Commissions and fees
Total commissions and fees	324	325	1,005	924
Transactional service fees
Commissions and fees
Total commissions and fees	344	327	1,043	978
Corporate finance
Commissions and fees
Total commissions and fees	164	89	512	277
Insurance distribution revenue
Commissions and fees
Total commissions and fees	76	77	238	257
Insurance premiums
Commissions and fees
Total commissions and fees	23	26	72	72
Loan servicing
Commissions and fees
Total commissions and fees	19	21	54	71
Other
Commissions and fees
Total commissions and fees	121	92	349	300
Commissions and fees
Commissions and fees
Commissions and fees	$ (2,791)	$ (2,897)	$ (8,162)	$ (8,497)