COMMISSIONS AND FEES; ADMINISTRATION AND OTHER FIDUCIARY FEES - Administration and Other Fiduciary Fees (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Commissions and fees
Administration and other fiduciary fees	$ 3,943	$ 3,472	$ 3,411
Custody fees
Commissions and fees
Administration and other fiduciary fees	1,898	1,657	1,542
Fiduciary fees
Commissions and fees
Administration and other fiduciary fees	1,464	1,274	1,296
Guarantee fees
Commissions and fees
Administration and other fiduciary fees	581	541	573
Administration and other fiduciary fees
Commissions and fees
Administration and other fiduciary fees	3,943	3,472	3,411
Revenue not accounted for under ASC 606	581	541	573
ICG | Custody fees
Commissions and fees
Administration and other fiduciary fees	1,872	1,590	1,453
ICG | Fiduciary fees
Commissions and fees
Administration and other fiduciary fees	798	668	647
ICG | Guarantee fees
Commissions and fees
Administration and other fiduciary fees	569	529	558
ICG | Administration and other fiduciary fees
Commissions and fees
Administration and other fiduciary fees	3,239	2,787	2,658
GCB | Custody fees
Commissions and fees
Administration and other fiduciary fees	25	29	16
GCB | Fiduciary fees
Commissions and fees
Administration and other fiduciary fees	659	602	621
GCB | Guarantee fees
Commissions and fees
Administration and other fiduciary fees	8	7	8
GCB | Administration and other fiduciary fees
Commissions and fees
Administration and other fiduciary fees	692	638	645
Corporate/Other | Custody fees
Commissions and fees
Administration and other fiduciary fees	1	38	73
Corporate/Other | Fiduciary fees
Commissions and fees
Administration and other fiduciary fees	7	4	28
Corporate/Other | Guarantee fees
Commissions and fees
Administration and other fiduciary fees	4	5	7
Corporate/Other | Administration and other fiduciary fees
Commissions and fees
Administration and other fiduciary fees	$ 12	$ 47	$ 108