SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Carrying Amounts and Classifications of Consolidated Assets (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Variable Interest Entity
Cash	$ 27,768	$ 27,515	$ 26,204
Trading account assets	357,997	331,945
Investments	514,602	512,822
Total loans, net of allowance	644,276	651,312
Increase in other assets	146,128	125,879
Total assets	2,394,105	2,291,413	$ 2,291,000
Unconsolidated VIEs
Variable Interest Entity
Cash	0	0
Trading account assets	1,400	1,400
Investments	8,800	8,800
Total loans, net of allowance	37,600	35,400
Increase in other assets	1,000	800
Total assets	$ 48,800	$ 46,400