COMMISSIONS AND FEES; ADMINISTRATION AND OTHER FIDUCIARY FEES - Commissions and Fees Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Commissions and fees
Total commissions and fees	$ 2,132	$ 2,452	$ 4,498	$ 5,020
Investment banking
Commissions and fees
Total commissions and fees	598	845	1,324	1,753
Brokerage commissions
Commissions and fees
Total commissions and fees	576	659	1,211	1,428
Interchange fees
Commissions and fees
Total commissions and fees	3,080	2,983	5,930	5,543
Card-related loan fees
Commissions and fees
Total commissions and fees	120	163	238	317
Card rewards and partner payments
Commissions and fees
Total commissions and fees	(3,197)	(3,196)	(6,126)	(5,984)
Deposit-related fees
Commissions and fees
Total commissions and fees	299	342	599	685
Transactional service fees
Commissions and fees
Total commissions and fees	334	298	652	582
Corporate finance
Commissions and fees
Total commissions and fees	86	136	188	255
Insurance distribution revenue
Commissions and fees
Total commissions and fees	88	89	180	177
Insurance premiums
Commissions and fees
Total commissions and fees	26	23	48	48
Loan servicing
Commissions and fees
Total commissions and fees	23	23	50	48
Other
Commissions and fees
Total commissions and fees	99	87	204	168
Overdraft fees
Commissions and fees
Total commissions and fees	0	28
Commissions and fees
Commissions and fees
Revenue not accounted for under ASC 606, revenue from contracts with customers	(2,940)	(2,811)	(5,599)	(5,240)
ICG
Commissions and fees
Total commissions and fees	1,804	2,097	3,771	4,245
ICG | Investment banking
Commissions and fees
Total commissions and fees	598	845	1,324	1,753
ICG | Brokerage commissions
Commissions and fees
Total commissions and fees	360	393	774	853
ICG | Interchange fees
Commissions and fees
Total commissions and fees	361	321	694	561
ICG | Card-related loan fees
Commissions and fees
Total commissions and fees	17	11	30	20
ICG | Card rewards and partner payments
Commissions and fees
Total commissions and fees	(202)	(165)	(376)	(282)
ICG | Deposit-related fees
Commissions and fees
Total commissions and fees	272	279	524	546
ICG | Transactional service fees
Commissions and fees
Total commissions and fees	303	267	592	521
ICG | Corporate finance
Commissions and fees
Total commissions and fees	86	136	185	252
ICG | Insurance distribution revenue
Commissions and fees
Total commissions and fees	0	0	0	0
ICG | Insurance premiums
Commissions and fees
Total commissions and fees	0	0	0	0
ICG | Loan servicing
Commissions and fees
Total commissions and fees	8	7	17	19
ICG | Other
Commissions and fees
Total commissions and fees	1	3	7	2
PBWM
Commissions and fees
Total commissions and fees	18	17	99	99
PBWM | Investment banking
Commissions and fees
Total commissions and fees	0	0	0	0
PBWM | Brokerage commissions
Commissions and fees
Total commissions and fees	182	213	359	454
PBWM | Interchange fees
Commissions and fees
Total commissions and fees	2,555	2,435	4,902	4,534
PBWM | Card-related loan fees
Commissions and fees
Total commissions and fees	37	73	80	137
PBWM | Card rewards and partner payments
Commissions and fees
Total commissions and fees	(2,904)	(2,871)	(5,567)	(5,370)
PBWM | Deposit-related fees
Commissions and fees
Total commissions and fees	18	44	58	103
PBWM | Transactional service fees
Commissions and fees
Total commissions and fees	6	5	10	9
PBWM | Corporate finance
Commissions and fees
Total commissions and fees	0	0	3	3
PBWM | Insurance distribution revenue
Commissions and fees
Total commissions and fees	61	56	119	108
PBWM | Insurance premiums
Commissions and fees
Total commissions and fees	1	1	2	2
PBWM | Loan servicing
Commissions and fees
Total commissions and fees	11	12	26	22
PBWM | Other
Commissions and fees
Total commissions and fees	51	49	107	97
Legacy Franchises
Commissions and fees
Total commissions and fees	311	338	627	676
Legacy Franchises | Investment banking
Commissions and fees
Total commissions and fees	0	0	0	0
Legacy Franchises | Brokerage commissions
Commissions and fees
Total commissions and fees	34	53	78	121
Legacy Franchises | Interchange fees
Commissions and fees
Total commissions and fees	164	227	334	448
Legacy Franchises | Card-related loan fees
Commissions and fees
Total commissions and fees	66	79	128	160
Legacy Franchises | Card rewards and partner payments
Commissions and fees
Total commissions and fees	(91)	(160)	(183)	(332)
Legacy Franchises | Deposit-related fees
Commissions and fees
Total commissions and fees	9	19	17	36
Legacy Franchises | Transactional service fees
Commissions and fees
Total commissions and fees	25	26	50	52
Legacy Franchises | Corporate finance
Commissions and fees
Total commissions and fees	0	0	0	0
Legacy Franchises | Insurance distribution revenue
Commissions and fees
Total commissions and fees	27	33	61	69
Legacy Franchises | Insurance premiums
Commissions and fees
Total commissions and fees	25	22	46	46
Legacy Franchises | Loan servicing
Commissions and fees
Total commissions and fees	4	4	7	7
Legacy Franchises | Other
Commissions and fees
Total commissions and fees	$ 48	$ 35	$ 89	$ 69