SECURITIES BORROWED, LOANED AND SUBJECT TO REPURCHASE AGREEMENTS - Repurchase Agreements by Contractual Maturity (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Assets Sold under Agreements to Repurchase
Securities sold under agreements to repurchase	$ 304,310	$ 305,597
Deposits received for securities loaned	31,454	33,029
Total	335,764	338,626
Open and overnight
Assets Sold under Agreements to Repurchase
Securities sold under agreements to repurchase	137,220	127,679
Deposits received for securities loaned	20,858	23,387
Total	158,078	151,066
Up to 30 days
Assets Sold under Agreements to Repurchase
Securities sold under agreements to repurchase	80,290	93,257
Deposits received for securities loaned	406	6
Total	80,696	93,263
31–90 days
Assets Sold under Agreements to Repurchase
Securities sold under agreements to repurchase	33,962	32,908
Deposits received for securities loaned	1,539	1,392
Total	35,501	34,300
Greater than 90 days
Assets Sold under Agreements to Repurchase
Securities sold under agreements to repurchase	52,838	51,753
Deposits received for securities loaned	8,651	8,244
Total	$ 61,489	$ 59,997