SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Carrying Amounts and Classifications of Consolidated Assets (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Variable Interest Entity
Cash	$ 27,117	$ 26,349	$ 22,889
Trading account assets	370,950	375,079
Investments	487,063	447,359
Total loans, net of allowance	657,596	650,927
Increase in other assets	116,089	110,683
Total assets	2,327,868	2,260,090
Unconsolidated VIEs
Variable Interest Entity
Cash	0	0
Trading account assets	1,400	2,000
Investments	9,600	10,600
Total loans, net of allowance	33,200	29,300
Increase in other assets	700	300
Total assets	$ 44,900	$ 42,200