SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Carrying Amounts and Classifications of Consolidated Assets (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Variable Interest Entity
Cash	$ 25,308	$ 23,967	$ 24,086
Trading account assets	348,209	276,140
Investments	447,524	368,563
Total loans, net of allowance	640,485	686,700
Other	107,150	107,709
Total assets	2,234,459	1,951,158
Unconsolidated VIEs
Variable Interest Entity
Cash	0	0
Trading account assets	2,100	2,600
Investments	10,100	9,900
Total loans, net of allowance	27,500	26,700
Other	300	500
Total assets	$ 40,000	$ 39,700