SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Carrying Amounts and Classifications of Consolidated Assets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Variable Interest Entity
Cash	$ 27,342	$ 30,577	$ 27,515
Trading account assets	411,756	334,114
Investments	519,085	526,582
Other assets	95,963	103,743
Total assets	2,411,834	2,416,676	$ 2,291,000
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
Cash	0	0
Trading account assets	1,900	1,600
Investments	8,300	8,600
Total loans, net of allowance	51,800	44,200
Other assets	600	600
Total assets	$ 62,600	$ 55,000