COMMISSIONS AND FEES; ADMINISTRATION AND OTHER FIDUCIARY FEES - Commissions and Fees Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Commissions and fees
Total commissions and fees	$ 2,366	$ 2,568
Investment banking
Commissions and fees
Total commissions and fees	726	908
Brokerage commissions
Commissions and fees
Total commissions and fees	637	767
Interchange fees
Commissions and fees
Total commissions and fees	2,849	2,560
Card-related loan fees
Commissions and fees
Total commissions and fees	118	154
Card rewards and partner payments
Commissions and fees
Total commissions and fees	(2,928)	(2,789)
Deposit-related fees
Commissions and fees
Total commissions and fees	299	344
Transactional service fees
Commissions and fees
Total commissions and fees	319	284
Corporate finance
Commissions and fees
Total commissions and fees	102	119
Insurance distribution revenue
Commissions and fees
Total commissions and fees	92	88
Insurance premiums
Commissions and fees
Total commissions and fees	22	26
Loan servicing
Commissions and fees
Total commissions and fees	28	26
Other
Commissions and fees
Total commissions and fees	102	81
Overdraft fees
Commissions and fees
Total commissions and fees	0	32
Commissions and fees
Commissions and fees
Revenue not accounted for under ASC 606, revenue from contracts with customers	(2,656)	(2,427)
ICG
Commissions and fees
Total commissions and fees	1,967	2,147
ICG | Investment banking
Commissions and fees
Total commissions and fees	726	908
ICG | Brokerage commissions
Commissions and fees
Total commissions and fees	415	460
ICG | Interchange fees
Commissions and fees
Total commissions and fees	333	240
ICG | Card-related loan fees
Commissions and fees
Total commissions and fees	13	9
ICG | Card rewards and partner payments
Commissions and fees
Total commissions and fees	(174)	(118)
ICG | Deposit-related fees
Commissions and fees
Total commissions and fees	252	267
ICG | Transactional service fees
Commissions and fees
Total commissions and fees	289	254
ICG | Corporate finance
Commissions and fees
Total commissions and fees	99	116
ICG | Insurance distribution revenue
Commissions and fees
Total commissions and fees	0	0
ICG | Insurance premiums
Commissions and fees
Total commissions and fees	0	0
ICG | Loan servicing
Commissions and fees
Total commissions and fees	9	12
ICG | Other
Commissions and fees
Total commissions and fees	5	(1)
PBWM
Commissions and fees
Total commissions and fees	82	80
PBWM | Investment banking
Commissions and fees
Total commissions and fees	0	0
PBWM | Brokerage commissions
Commissions and fees
Total commissions and fees	178	240
PBWM | Interchange fees
Commissions and fees
Total commissions and fees	2,347	2,099
PBWM | Card-related loan fees
Commissions and fees
Total commissions and fees	43	64
PBWM | Card rewards and partner payments
Commissions and fees
Total commissions and fees	(2,663)	(2,499)
PBWM | Deposit-related fees
Commissions and fees
Total commissions and fees	39	59
PBWM | Transactional service fees
Commissions and fees
Total commissions and fees	4	4
PBWM | Corporate finance
Commissions and fees
Total commissions and fees	3	3
PBWM | Insurance distribution revenue
Commissions and fees
Total commissions and fees	58	52
PBWM | Insurance premiums
Commissions and fees
Total commissions and fees	1	1
PBWM | Loan servicing
Commissions and fees
Total commissions and fees	16	10
PBWM | Other
Commissions and fees
Total commissions and fees	56	47
Legacy Franchises
Commissions and fees
Total commissions and fees	317	341
Legacy Franchises | Investment banking
Commissions and fees
Total commissions and fees	0	0
Legacy Franchises | Brokerage commissions
Commissions and fees
Total commissions and fees	44	67
Legacy Franchises | Interchange fees
Commissions and fees
Total commissions and fees	169	221
Legacy Franchises | Card-related loan fees
Commissions and fees
Total commissions and fees	62	81
Legacy Franchises | Card rewards and partner payments
Commissions and fees
Total commissions and fees	(91)	(172)
Legacy Franchises | Deposit-related fees
Commissions and fees
Total commissions and fees	8	18
Legacy Franchises | Transactional service fees
Commissions and fees
Total commissions and fees	26	26
Legacy Franchises | Corporate finance
Commissions and fees
Total commissions and fees	0	0
Legacy Franchises | Insurance distribution revenue
Commissions and fees
Total commissions and fees	34	36
Legacy Franchises | Insurance premiums
Commissions and fees
Total commissions and fees	21	25
Legacy Franchises | Loan servicing
Commissions and fees
Total commissions and fees	3	4
Legacy Franchises | Other
Commissions and fees
Total commissions and fees	$ 41	$ 35