SECURITIES BORROWED, LOANED AND SUBJECT TO REPURCHASE AGREEMENTS - Securities (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Abstract]
Securities purchased under agreements to resell	$ 213,896	$ 267,319
Securities borrowed	72,036	78,408
Total, net	285,932	345,727
Allowance for credit losses on securities purchased and borrowed	(4)	(27)
Total, net of allowance	285,928	345,700
Securities sold under agreements to repurchase	263,298	264,958
Securities loaned	15,079	13,149
Total, net	278,377	278,107
Securities-for-securities lending transactions	$ 6,300	$ 4,300