SECURITIES BORROWED, LOANED AND SUBJECT TO REPURCHASE AGREEMENTS - Securities (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Abstract]
Securities purchased under agreements to resell	$ 241,098	$ 267,319
Deposits paid for securities borrowed	76,905	78,408
Total, net	318,003	345,727
Allowance for credit losses on securities purchased and borrowed	(33)	(27)
Total, net of allowance	317,970	345,700
Securities sold under agreements to repurchase	291,878	264,958
Deposits received for securities loaned	13,328	13,149
Total, net	305,206	278,107
Securities-for-securities lending transactions	$ 5,300	$ 4,300