COMMISSIONS AND FEES; ADMINISTRATION AND OTHER FIDUCIARY FEES - Commissions and Fees Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Commissions and fees
Total commissions and fees	$ 2,139	$ 3,399	$ 7,159	$ 10,443
Investment banking
Commissions and fees
Total commissions and fees	725	1,493	2,477	4,503
Brokerage commissions
Commissions and fees
Total commissions and fees	571	773	1,999	2,536
Interchange fees
Commissions and fees
Total commissions and fees	2,949	2,542	8,492	7,076
Card-related loan fees
Commissions and fees
Total commissions and fees	142	171	459	530
Card rewards and partner payments
Commissions and fees
Total commissions and fees	(3,161)	(2,660)	(9,147)	(7,346)
Deposit-related fees
Commissions and fees
Total commissions and fees	300	339	984	993
Transactional service fees
Commissions and fees
Total commissions and fees	295	281	877	823
Corporate finance
Commissions and fees
Total commissions and fees	87	214	342	552
Insurance distribution revenue
Commissions and fees
Total commissions and fees	90	117	267	365
Insurance premiums
Commissions and fees
Total commissions and fees	23	25	72	75
Loan servicing
Commissions and fees
Total commissions and fees	31	24	79	71
Other
Commissions and fees
Total commissions and fees	87	80	258	265
Overdraft fees
Commissions and fees
Total commissions and fees	0	28	59	75
Commissions and fees
Commissions and fees
Revenue not accounted for under ASC 606, revenue from contracts with customers	(2,872)	(2,208)	(8,115)	(6,031)
ICG
Commissions and fees
Total commissions and fees	1,886	2,755	6,129	8,266
ICG | Investment banking
Commissions and fees
Total commissions and fees	725	1,493	2,477	4,503
ICG | Brokerage commissions
Commissions and fees
Total commissions and fees	356	412	1,209	1,380
ICG | Interchange fees
Commissions and fees
Total commissions and fees	330	225	891	580
ICG | Card-related loan fees
Commissions and fees
Total commissions and fees	12	7	32	18
ICG | Card rewards and partner payments
Commissions and fees
Total commissions and fees	(175)	(119)	(458)	(298)
ICG | Deposit-related fees
Commissions and fees
Total commissions and fees	262	267	807	766
ICG | Transactional service fees
Commissions and fees
Total commissions and fees	270	249	791	723
ICG | Corporate finance
Commissions and fees
Total commissions and fees	87	213	339	548
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	13	9	32	31
ICG | Other
Commissions and fees
Total commissions and fees	6	(2)	9	15
PBWM
Commissions and fees
Total commissions and fees	(55)	202	43	810
PBWM | Investment banking
Commissions and fees
Total commissions and fees	0	0	0	0
PBWM | Brokerage commissions
Commissions and fees
Total commissions and fees	167	248	621	814
PBWM | Interchange fees
Commissions and fees
Total commissions and fees	2,420	2,107	6,954	5,861
PBWM | Card-related loan fees
Commissions and fees
Total commissions and fees	64	72	201	223
PBWM | Card rewards and partner payments
Commissions and fees
Total commissions and fees	(2,852)	(2,415)	(8,223)	(6,673)
PBWM | Deposit-related fees
Commissions and fees
Total commissions and fees	25	49	128	145
PBWM | Transactional service fees
Commissions and fees
Total commissions and fees	5	6	14	18
PBWM | Corporate finance
Commissions and fees
Total commissions and fees	0	0	3	4
PBWM | Insurance distribution revenue
Commissions and fees
Total commissions and fees	57	77	165	237
PBWM | Insurance premiums
Commissions and fees
Total commissions and fees	1	1	3	9
PBWM | Loan servicing
Commissions and fees
Total commissions and fees	14	11	36	27
PBWM | Other
Commissions and fees
Total commissions and fees	44	46	141	145
Legacy Franchises
Commissions and fees
Total commissions and fees	308	442	986	1,367
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	48	113	169	342
Legacy Franchises | Interchange fees
Commissions and fees
Total commissions and fees	199	210	647	635
Legacy Franchises | Card-related loan fees
Commissions and fees
Total commissions and fees	66	92	226	289
Legacy Franchises | Card rewards and partner payments
Commissions and fees
Total commissions and fees	(134)	(126)	(466)	(375)
Legacy Franchises | Deposit-related fees
Commissions and fees
Total commissions and fees	13	23	49	82
Legacy Franchises | Transactional service fees
Commissions and fees
Total commissions and fees	20	26	72	82
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	33	40	102	128
Legacy Franchises | Insurance premiums
Commissions and fees
Total commissions and fees	22	24	69	66
Legacy Franchises | Loan servicing
Commissions and fees
Total commissions and fees	4	4	11	13
Legacy Franchises | Other
Commissions and fees
Total commissions and fees	$ 37	$ 36	$ 107	$ 105