SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Asset Based Financing (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Variable Interest Entity
Total unconsolidated VIE assets	$ 409,750	$ 390,731
Maximum exposure to unconsolidated VIEs	54,550	55,980
Commercial and other real estate | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	32,186	31,377
Maximum exposure to unconsolidated VIEs	7,465	7,489
Corporate loans | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	12,151	7,088
Maximum exposure to unconsolidated VIEs	8,097	5,802
Other (including investment funds, airlines and shipping) | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	162,232	152,124
Maximum exposure to unconsolidated VIEs	19,939	21,140
Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	206,569	190,589
Maximum exposure to unconsolidated VIEs	$ 35,501	$ 34,431