COMMISSIONS AND FEES; ADMINISTRATION AND OTHER FIDUCIARY FEES - Commissions and Fees Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Commissions and fees
Total commissions and fees	$ 2,662	$ 2,132	$ 5,386	$ 4,498
Investment Banking
Commissions and fees
Total commissions and fees	875	598	1,748	1,324
Brokerage Commissions
Commissions and fees
Total commissions and fees	622	576	1,241	1,211
Revenue recognized	44	53	86	114
Interchange fees
Commissions and fees
Total commissions and fees	3,110	3,080	6,022	5,930
Card-related loan fees
Commissions and fees
Total commissions and fees	147	120	277	238
Card rewards and partner payments
Commissions and fees
Total commissions and fees	(3,189)	(3,197)	(6,106)	(6,126)
Deposit-related fees
Commissions and fees
Total commissions and fees	341	299	681	599
Transactional service fees
Commissions and fees
Total commissions and fees	359	334	699	652
Corporate finance
Commissions and fees
Total commissions and fees	150	86	349	188
Insurance distribution revenue
Commissions and fees
Total commissions and fees	78	88	162	180
Insurance premiums
Commissions and fees
Total commissions and fees	24	26	49	48
Loan servicing
Commissions and fees
Total commissions and fees	22	23	35	50
Other
Commissions and fees
Total commissions and fees	123	99	229	204
Commissions and fees
Commissions and fees
Commissions and fees	$ (2,833)	$ (2,940)	$ (5,365)	$ (5,599)