SECURITIES BORROWED, LOANED AND SUBJECT TO REPURCHASE AGREEMENTS - Repurchase Agreements by Class of Collateral (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Assets Sold under Agreements to Repurchase
Repurchase agreements	$ 759,047	$ 716,423
Securities lending agreements	64,269	48,807
Total	823,316	765,230
U.S. Treasury and federal agency securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	300,287	349,012
Securities lending agreements	103	28
Total	300,390	349,040
State and municipal securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	174	240
Securities lending agreements	0	56
Total	174	296
Foreign government securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	250,684	208,189
Securities lending agreements	574	226
Total	251,258	208,415
Corporate bonds
Assets Sold under Agreements to Repurchase
Repurchase agreements	38,962	24,161
Securities lending agreements	498	163
Total	39,460	24,324
Equity securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	39,123	26,779
Securities lending agreements	62,172	46,792
Total	101,295	73,571
Mortgage-backed securities
Assets Sold under Agreements to Repurchase
Repurchase agreements	117,233	100,191
Securities lending agreements	0	21
Total	117,233	100,212
Asset-based financing
Assets Sold under Agreements to Repurchase
Repurchase agreements	7,918	6,203
Securities lending agreements	0	73
Total	7,918	6,276
Other
Assets Sold under Agreements to Repurchase
Repurchase agreements	4,666	1,648
Securities lending agreements	922	1,448
Total	$ 5,588	$ 3,096