SECURITIES BORROWED, LOANED AND SUBJECT TO REPURCHASE AGREEMENTS - Repurchase Agreements by Class of Collateral (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Assets Sold under Agreements to Repurchase
Repurchase agreements	$ 591,031	$ 563,539
Securities lending agreements	34,326	34,315
Total	625,357	597,854
U.S. Treasury and federal agency securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	298,600	324,233
Securities lending agreements	96	40
Total	298,696	324,273
State and municipal securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	219	183
Securities lending agreements	0	0
Total	219	183
Foreign government securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	159,194	132,123
Securities lending agreements	968	1,069
Total	160,162	133,192
Corporate bonds
Assets Sold under Agreements to Repurchase
Repurchase agreements	20,529	17,467
Securities lending agreements	500	330
Total	21,029	17,797
Equity securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	24,565	18,498
Securities lending agreements	32,496	32,837
Total	57,061	51,335
Mortgage-backed securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	83,673	65,279
Securities lending agreements	13	0
Total	83,686	65,279
Asset-backed securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	2,481	2,609
Securities lending agreements	89	23
Total	2,570	2,632
Other
Assets Sold under Agreements to Repurchase
Repurchase agreements	1,770	3,147
Securities lending agreements	164	16
Total	$ 1,934	$ 3,163