COMMISSIONS AND FEES; ADMINISTRATION AND OTHER FIDUCIARY FEES - Administration and Other Fiduciary Fees (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Commissions and fees
Administration and other fiduciary fees	$ 4,134	$ 3,781	$ 3,784
Custody fees
Commissions and fees
Administration and other fiduciary fees	2,026	1,871	1,877
Fiduciary fees
Commissions and fees
Administration and other fiduciary fees	1,583	1,376	1,350
Guarantee fees
Commissions and fees
Administration and other fiduciary fees	525	534	557
Administration and other fiduciary fees
Commissions and fees
Administration and other fiduciary fees	4,134	3,781	3,784
Revenue not accounted for under ASC 606	$ 525	$ 534	$ 557