SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Asset Based Financing (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Variable Interest Entity
Total unconsolidated VIE assets	$ 390,651	$ 291,992
Maximum exposure to unconsolidated VIEs	55,976	55,534
Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	190,589	98,805
Maximum exposure to unconsolidated VIEs	34,431	32,112
Commercial and other real estate | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	31,377	23,918
Maximum exposure to unconsolidated VIEs	7,489	6,928
Corporate loans | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	7,088	6,973
Maximum exposure to unconsolidated VIEs	5,802	5,744
Other (including investment funds, airlines and shipping) | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	152,124	67,914
Maximum exposure to unconsolidated VIEs	$ 21,140	$ 19,440