SECURITIES BORROWED, LOANED AND SUBJECT TO REPURCHASE AGREEMENTS - Repurchase Agreements by Class of Collateral (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Assets Sold under Agreements to Repurchase
Repurchase agreements	$ 584,286	$ 513,172
Securities lending agreements	35,806	32,622
Total	620,092	545,794
U.S. Treasury and federal agency securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	272,578	223,343
Securities lending agreements	64	461
Total	272,642	223,804
State and municipal securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	166	447
Securities lending agreements	13	2
Total	179	449
Foreign government securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	167,853	174,661
Securities lending agreements	546	118
Total	168,399	174,779
Corporate bonds
Assets Sold under Agreements to Repurchase
Repurchase agreements	17,635	12,403
Securities lending agreements	231	195
Total	17,866	12,598
Equity securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	19,266	5,853
Securities lending agreements	34,652	31,574
Total	53,918	37,427
Mortgage-backed securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	98,421	85,014
Securities lending agreements	0	21
Total	98,421	85,035
Asset-backed securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	2,430	3,032
Securities lending agreements	0	178
Total	2,430	3,210
Other
Assets Sold under Agreements to Repurchase
Repurchase agreements	5,937	8,419
Securities lending agreements	300	73
Total	$ 6,237	$ 8,492