SECURITIES BORROWED, LOANED AND SUBJECT TO REPURCHASE AGREEMENTS - Offsetting (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Securities purchased under agreements to resell
Gross amounts of recognized assets	$ 369,843	$ 367,594
Gross amounts offset on the Consolidated Balance Sheet	121,369	131,342
Net amounts of assets included on the Consolidated Balance Sheet	248,474	236,252
Amounts not offset on the Consolidated Balance Sheet but eligible for offsetting upon counterparty default	224,591	205,349
Net amounts	23,883	30,903
Deposits paid for securities borrowed
Gross amounts of recognized assets	106,841	107,041
Gross amounts offset on the Consolidated Balance Sheet	9,901	15,999
Net amounts of assets included on the Consolidated Balance Sheet	96,940	91,042
Amounts not offset on the Consolidated Balance Sheet but eligible for offsetting upon counterparty default	20,914	17,326
Net amounts	76,026	73,716
Total
Gross amounts of recognized assets	476,684	474,635
Gross amounts offset on the Consolidated Balance Sheet	131,270	147,341
Net amounts of assets included on the Consolidated Balance Sheet	345,414	327,294
Amounts not offset on the Consolidated Balance Sheet but eligible for offsetting upon counterparty default	245,505	222,675
Net amounts	99,909	104,619
Securities sold under agreements to repurchase
Gross amounts of recognized liabilities	304,310	305,597
Gross amounts offset on the Consolidated Balance Sheet	121,369	131,342
Net amounts of liabilities included on the Consolidated Balance Sheet	182,941	174,255
Amounts not offset on the Consolidated Balance Sheet but eligible for offsetting upon counterparty default	78,390	85,184
Net amounts	104,551	89,071
Deposits received for securities loaned
Gross amounts of recognized liabilities	31,454	33,029
Gross amounts offset on the Consolidated Balance Sheet	9,901	15,999
Net amounts of liabilities included on the Consolidated Balance Sheet	21,553	17,030
Amounts not offset on the Consolidated Balance Sheet but eligible for offsetting upon counterparty default	3,943	2,868
Net amounts	17,610	14,162
Total
Gross amounts of recognized liabilities	335,764	338,626
Gross amounts offset on the Consolidated Balance Sheet	131,270	147,341
Net amounts of liabilities included on the Consolidated Balance Sheet	204,494	191,285
Amounts not offset on the Consolidated Balance Sheet but eligible for offsetting upon counterparty default	82,333	88,052
Net amounts	$ 122,161	$ 103,233