SECURITIES BORROWED, LOANED AND SUBJECT TO REPURCHASE AGREEMENTS - Repurchase Agreements by Contractual Maturity (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Assets Sold under Agreements to Repurchase
Securities sold under agreements to repurchase	$ 550,619	$ 513,172
Deposits received for securities loaned	30,171	32,622
Total	580,790	545,794
Open and overnight
Assets Sold under Agreements to Repurchase
Securities sold under agreements to repurchase	272,060	289,907
Deposits received for securities loaned	22,613	24,997
Total	294,673	314,904
Up to 30 days
Assets Sold under Agreements to Repurchase
Securities sold under agreements to repurchase	179,654	134,870
Deposits received for securities loaned	242	0
Total	179,896	134,870
31–90 days
Assets Sold under Agreements to Repurchase
Securities sold under agreements to repurchase	41,634	35,639
Deposits received for securities loaned	166	1,270
Total	41,800	36,909
Greater than 90 days
Assets Sold under Agreements to Repurchase
Securities sold under agreements to repurchase	57,271	52,756
Deposits received for securities loaned	7,150	6,355
Total	$ 64,421	$ 59,111