SECURITIES BORROWED, LOANED AND SUBJECT TO REPURCHASE AGREEMENTS - Repurchase Agreements by Class of Collateral (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Assets Sold under Agreements to Repurchase
Repurchase agreements	$ 378,526	$ 296,218
Securities lending agreements	31,607	33,269
Total	410,133	329,487
U.S. Treasury and federal agency securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	163,199	99,979
Securities lending agreements	0	106
Total	163,199	100,085
State and municipal securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	1,499	1,911
Securities lending agreements	0	0
Total	1,499	1,911
Foreign government securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	136,943	123,826
Securities lending agreements	2	13
Total	136,945	123,839
Corporate bonds
Assets Sold under Agreements to Repurchase
Repurchase agreements	17,549	14,308
Securities lending agreements	27	45
Total	17,576	14,353
Equity securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	9,437	9,749
Securities lending agreements	31,577	33,096
Total	41,014	42,845
Mortgage-backed securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	39,080	36,225
Securities lending agreements	0	0
Total	39,080	36,225
Asset-backed securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	2,878	1,755
Securities lending agreements	0	0
Total	2,878	1,755
Other
Assets Sold under Agreements to Repurchase
Repurchase agreements	7,941	8,465
Securities lending agreements	1	9
Total	$ 7,942	$ 8,474