COMMISSIONS AND FEES; ADMINISTRATION AND OTHER FIDUCIARY FEES - Commissions and Fees Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Commissions and fees
Total commissions and fees	$ 3,298	$ 2,745	$ 6,570	$ 5,452
Investment Banking
Commissions and fees
Total commissions and fees	1,358	1,006	2,596	2,043
Brokerage Commissions
Commissions and fees
Total commissions and fees	821	701	1,707	1,405
Revenue recognized	48	45	106	91
Interchange fees
Commissions and fees
Total commissions and fees	3,387	3,038	6,402	5,876
Card-related loan fees
Commissions and fees
Total commissions and fees	249	179	456	342
Card rewards and partner payments
Commissions and fees
Total commissions and fees	(3,909)	(3,325)	(7,146)	(6,460)
Deposit-related fees
Commissions and fees
Total commissions and fees	372	338	718	666
Transactional service fees
Commissions and fees
Total commissions and fees	394	381	792	734
Corporate finance
Commissions and fees
Total commissions and fees	278	171	428	343
Insurance distribution revenue
Commissions and fees
Total commissions and fees	82	79	176	160
Insurance premiums
Commissions and fees
Total commissions and fees	60	30	108	53
Loan servicing
Commissions and fees
Total commissions and fees	19	23	36	47
Other
Commissions and fees
Total commissions and fees	187	124	297	243
Commissions and fees
Commissions and fees
Revenue not from contract with customer	$ (3,302)	$ (2,918)	$ (6,118)	$ (5,668)