SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Carrying Amounts and Classifications of Consolidated Assets (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Variable Interest Entity
Cash and due from banks	$ 22,889	$ 23,967	$ 24,997
Trading account assets	362,311	276,140
Investments	433,253	368,563
Purchased credit-deteriorated	658,872	686,700
Other	108,106	107,709
Total assets	2,232,715	1,951,158
Unconsolidated VIEs
Variable Interest Entity
Cash and due from banks	0	0
Trading account assets	2,100	2,600
Investments	10,000	9,900
Purchased credit-deteriorated	29,000	26,700
Other	500	500
Total assets	$ 41,600	$ 39,700