SECURITIES BORROWED, LOANED AND SUBJECT TO REPURCHASE AGREEMENTS - Repurchase Agreements by Class of Collateral (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Assets Sold under Agreements to Repurchase
Repurchase agreements	$ 466,340	$ 296,218
Securities lending agreements	29,440	33,269
Total	495,780	329,487
U.S. Treasury and federal agency securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	185,547	99,979
Securities lending agreements	544	106
Total	186,091	100,085
State and municipal securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	1,465	1,911
Securities lending agreements	0	0
Total	1,465	1,911
Foreign government securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	176,437	123,826
Securities lending agreements	593	13
Total	177,030	123,839
Corporate bonds
Assets Sold under Agreements to Repurchase
Repurchase agreements	16,729	14,308
Securities lending agreements	246	45
Total	16,975	14,353
Equity securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	21,548	9,749
Securities lending agreements	27,561	33,096
Total	49,109	42,845
Mortgage-backed securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	54,842	36,225
Securities lending agreements	314	0
Total	55,156	36,225
Asset-backed securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	2,906	1,755
Securities lending agreements	0	0
Total	2,906	1,755
Other
Assets Sold under Agreements to Repurchase
Repurchase agreements	6,866	8,465
Securities lending agreements	182	9
Total	$ 7,048	$ 8,474