COMMISSIONS AND FEES; ADMINISTRATION AND OTHER FIDUCIARY FEES - Administration and Other Fiduciary Fees (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Commissions and fees
Total administration and other fiduciary fees	$ 1,046	$ 989	$ 2,083	$ 1,885
Custody fees
Commissions and fees
Total administration and other fiduciary fees	529	510	1,042	955
Fiduciary fees
Commissions and fees
Total administration and other fiduciary fees	388	344	780	654
Guarantee fees
Commissions and fees
Total administration and other fiduciary fees	129	135	261	276
Administration and other fiduciary fees
Commissions and fees
Total administration and other fiduciary fees	1,046	989	2,083	1,885
Revenue not accounted for under ASC 606, revenue from contracts with customers	$ 129	$ 135	$ 261	$ 276