SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Carrying Amounts and Classifications of Consolidated Assets (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Variable Interest Entity
Cash	$ 26,548	$ 30,577	$ 26,502
Trading account assets	406,368	334,114
Investments	508,998	526,582
Other assets	96,824	103,743
Total assets	2,368,477	2,416,676
Unconsolidated VIEs
Variable Interest Entity
Cash	0	0
Trading account assets	1,600	1,600
Investments	8,100	8,600
Total loans, net of allowance	45,300	44,200
Other assets	600	600
Total assets	$ 55,600	$ 55,000