COMMISSIONS AND FEES; ADMINISTRATION AND OTHER FIDUCIARY FEES - Commissions and Fees Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Commissions and fees
Commissions and fees revenue	$ 9,175	$ 13,672	$ 11,385
Investment banking
Commissions and fees
Commissions and fees revenue	3,084	6,007	4,483
Brokerage commissions
Commissions and fees
Commissions and fees revenue	2,546	3,236	2,960
Credit and bank card income, interchange fees
Commissions and fees
Commissions and fees revenue	11,505	9,821	8,004
Credit and bank card income, card-related loan fees
Commissions and fees
Commissions and fees revenue	589	695	649
Credit and bank card income, card rewards and partner payments
Commissions and fees
Commissions and fees revenue	(12,336)	(10,235)	(8,673)
Deposit-related fees
Commissions and fees
Commissions and fees revenue	1,274	1,331	1,334
Transactional service fees
Commissions and fees
Commissions and fees revenue	1,169	1,098	974
Corporate finance
Commissions and fees
Commissions and fees revenue	458	709	457
Insurance distribution revenue
Commissions and fees
Commissions and fees revenue	346	473	503
Insurance premiums
Commissions and fees
Commissions and fees revenue	91	94	125
Loan servicing
Commissions and fees
Commissions and fees revenue	103	98	137
Other
Commissions and fees
Commissions and fees revenue	346	345	432
Overdraft fees
Commissions and fees
Commissions and fees revenue	59	107	100
Commissions and fees
Commissions and fees
Revenue not accounted for under ASC 606	(11,008)	(8,516)	(7,160)
Institutional Clients Group
Commissions and fees
Commissions and fees revenue	7,911	10,986	8,870
Institutional Clients Group | Investment banking
Commissions and fees
Commissions and fees revenue	3,084	6,007	4,483
Institutional Clients Group | Brokerage commissions
Commissions and fees
Commissions and fees revenue	1,570	1,770	1,700
Institutional Clients Group | Credit and bank card income, interchange fees
Commissions and fees
Commissions and fees revenue	1,207	817	704
Institutional Clients Group | Credit and bank card income, card-related loan fees
Commissions and fees
Commissions and fees revenue	44	27	22
Institutional Clients Group | Credit and bank card income, card rewards and partner payments
Commissions and fees
Commissions and fees revenue	(625)	(405)	(380)
Institutional Clients Group | Deposit-related fees
Commissions and fees
Commissions and fees revenue	1,061	1,034	936
Institutional Clients Group | Transactional service fees
Commissions and fees
Commissions and fees revenue	1,057	968	857
Institutional Clients Group | Corporate finance
Commissions and fees
Commissions and fees revenue	454	705	453
Institutional Clients Group | Insurance distribution revenue
Commissions and fees
Commissions and fees revenue	0	0	0
Institutional Clients Group | Insurance premiums
Commissions and fees
Commissions and fees revenue	0	0	0
Institutional Clients Group | Loan servicing
Commissions and fees
Commissions and fees revenue	39	43	80
Institutional Clients Group | Other
Commissions and fees
Commissions and fees revenue	20	20	15
Personal Banking and Wealth Management
Commissions and fees
Commissions and fees revenue	(26)	915	884
Personal Banking and Wealth Management | Investment banking
Commissions and fees
Commissions and fees revenue	0	0	0
Personal Banking and Wealth Management | Brokerage commissions
Commissions and fees
Commissions and fees revenue	767	1,035	874
Personal Banking and Wealth Management | Credit and bank card income, interchange fees
Commissions and fees
Commissions and fees revenue	9,452	8,119	6,526
Personal Banking and Wealth Management | Credit and bank card income, card-related loan fees
Commissions and fees
Commissions and fees revenue	256	292	241
Personal Banking and Wealth Management | Credit and bank card income, card rewards and partner payments
Commissions and fees
Commissions and fees revenue	(11,133)	(9,296)	(7,688)
Personal Banking and Wealth Management | Deposit-related fees
Commissions and fees
Commissions and fees revenue	157	196	255
Personal Banking and Wealth Management | Transactional service fees
Commissions and fees
Commissions and fees revenue	17	22	20
Personal Banking and Wealth Management | Corporate finance
Commissions and fees
Commissions and fees revenue	4	4	4
Personal Banking and Wealth Management | Insurance distribution revenue
Commissions and fees
Commissions and fees revenue	217	309	318
Personal Banking and Wealth Management | Insurance premiums
Commissions and fees
Commissions and fees revenue	4	10	6
Personal Banking and Wealth Management | Loan servicing
Commissions and fees
Commissions and fees revenue	48	38	28
Personal Banking and Wealth Management | Other
Commissions and fees
Commissions and fees revenue	185	186	300
Legacy Franchises
Commissions and fees
Commissions and fees revenue	1,290	1,771	1,631
Legacy Franchises | Investment banking
Commissions and fees
Commissions and fees revenue	0	0	0
Legacy Franchises | Brokerage commissions
Commissions and fees
Commissions and fees revenue	209	431	386
Legacy Franchises | Credit and bank card income, interchange fees
Commissions and fees
Commissions and fees revenue	846	885	774
Legacy Franchises | Credit and bank card income, card-related loan fees
Commissions and fees
Commissions and fees revenue	289	376	386
Legacy Franchises | Credit and bank card income, card rewards and partner payments
Commissions and fees
Commissions and fees revenue	(578)	(534)	(605)
Legacy Franchises | Deposit-related fees
Commissions and fees
Commissions and fees revenue	56	101	143
Legacy Franchises | Transactional service fees
Commissions and fees
Commissions and fees revenue	95	108	97
Legacy Franchises | Corporate finance
Commissions and fees
Commissions and fees revenue	0	0	0
Legacy Franchises | Insurance distribution revenue
Commissions and fees
Commissions and fees revenue	129	164	185
Legacy Franchises | Insurance premiums
Commissions and fees
Commissions and fees revenue	87	84	119
Legacy Franchises | Loan servicing
Commissions and fees
Commissions and fees revenue	16	17	29
Legacy Franchises | Other
Commissions and fees
Commissions and fees revenue	$ 141	$ 139	$ 117