COMMISSIONS AND FEES; ADMINISTRATION AND OTHER FIDUCIARY FEES - Commissions and Fees Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Commissions and fees
Commissions and fees revenue	$ 10,653	$ 8,905	$ 9,175
Investment banking
Commissions and fees
Commissions and fees revenue	3,576	2,676	3,084
Brokerage commissions
Commissions and fees
Commissions and fees revenue	2,498	2,316	2,546
Revenue recognized	442	448	538
Credit and bank card income, interchange fees
Commissions and fees
Commissions and fees revenue	12,211	11,996	11,505
Credit and bank card income, card-related loan fees
Commissions and fees
Commissions and fees revenue	604	475	589
Card rewards and partner payments
Commissions and fees
Commissions and fees revenue	(12,592)	(12,513)	(12,336)
Deposit-related fees
Commissions and fees
Commissions and fees revenue	1,333	1,254	1,274
Transactional service fees
Commissions and fees
Commissions and fees revenue	1,390	1,323	1,169
Corporate finance
Commissions and fees
Commissions and fees revenue	685	439	458
Insurance distribution revenue
Commissions and fees
Commissions and fees revenue	313	321	346
Revenue recognized	165	188	201
Insurance premiums
Commissions and fees
Commissions and fees revenue	96	97	91
Loan servicing
Commissions and fees
Commissions and fees revenue	76	100	103
Other
Commissions and fees
Commissions and fees revenue	463	421	346
Commissions and fees
Commissions and fees
Revenue not accounted for under ASC 606	$ (11,076)	$ (11,367)	$ (11,008)