SECURITIES BORROWED, LOANED AND SUBJECT TO REPURCHASE AGREEMENTS - Repurchase Agreements by Class of Collateral (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Assets Sold under Agreements to Repurchase
Repurchase agreements	$ 564,959	$ 513,172
Securities lending agreements	34,203	32,622
Total	599,162	545,794
U.S. Treasury and federal agency securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	239,500	223,343
Securities lending agreements	0	461
Total	239,500	223,804
State and municipal securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	396	447
Securities lending agreements	0	2
Total	396	449
Foreign government securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	181,907	174,661
Securities lending agreements	177	118
Total	182,084	174,779
Corporate bonds
Assets Sold under Agreements to Repurchase
Repurchase agreements	19,209	12,403
Securities lending agreements	276	195
Total	19,485	12,598
Equity securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	28,069	5,853
Securities lending agreements	33,585	31,574
Total	61,654	37,427
Mortgage-backed securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	85,582	85,014
Securities lending agreements	18	21
Total	85,600	85,035
Asset-backed securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	2,629	3,032
Securities lending agreements	12	178
Total	2,641	3,210
Other
Assets Sold under Agreements to Repurchase
Repurchase agreements	7,667	8,419
Securities lending agreements	135	73
Total	$ 7,802	$ 8,492