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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Commissions and fees
Total administration and other fiduciary fees	$ 1,059	$ 971	$ 3,142	$ 2,856
Custody fees
Commissions and fees
Total administration and other fiduciary fees	520	469	1,562	1,424
Fiduciary fees
Commissions and fees
Total administration and other fiduciary fees	403	370	1,183	1,024
Guarantee fees
Commissions and fees
Total administration and other fiduciary fees	136	132	397	408
Administration and other fiduciary fees
Commissions and fees
Total administration and other fiduciary fees	1,059	971	3,142	2,856
Revenue not accounted for under ASC 606, revenue from contracts with customers	$ 136	$ 132	$ 397	$ 408