COMMISSIONS AND FEES; ADMINISTRATION AND OTHER FIDUCIARY FEES - Administration and Other Fiduciary Fees (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 administration and other fiduciary fees	$ 915	$ 1,007	$ 2,904	$ 2,990
Custody fees
Commissions and fees
Total administration and other fiduciary fees	445	479	1,449	1,439
Custody fees | ICG
Commissions and fees
Total administration and other fiduciary fees	422	451	1,375	1,359
Custody fees | PBWM
Commissions and fees
Total administration and other fiduciary fees	21	23	67	68
Custody fees | Legacy Franchises
Commissions and fees
Total administration and other fiduciary fees	2	5	7	12
Fiduciary fees
Commissions and fees
Total administration and other fiduciary fees	334	382	1,026	1,113
Fiduciary fees | ICG
Commissions and fees
Total administration and other fiduciary fees	78	64	210	186
Fiduciary fees | PBWM
Commissions and fees
Total administration and other fiduciary fees	179	206	580	598
Fiduciary fees | Legacy Franchises
Commissions and fees
Total administration and other fiduciary fees	77	112	236	329
Guarantee fees
Commissions and fees
Total administration and other fiduciary fees	136	146	429	438
Guarantee fees | ICG
Commissions and fees
Total administration and other fiduciary fees	124	132	391	398
Guarantee fees | PBWM
Commissions and fees
Total administration and other fiduciary fees	10	12	34	34
Guarantee fees | Legacy Franchises
Commissions and fees
Total administration and other fiduciary fees	2	2	4	6
Administration and other fiduciary fees
Commissions and fees
Total administration and other fiduciary fees	915	1,007	2,904	2,990
Revenue not accounted for under ASC 606, revenue from contracts with customers	136	146	429	438
Administration and other fiduciary fees | ICG
Commissions and fees
Total administration and other fiduciary fees	624	647	1,976	1,943
Administration and other fiduciary fees | PBWM
Commissions and fees
Total administration and other fiduciary fees	210	241	681	700
Administration and other fiduciary fees | Legacy Franchises
Commissions and fees
Total administration and other fiduciary fees	$ 81	$ 119	$ 247	$ 347