SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Asset Based Financing (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Variable Interest Entity
Total unconsolidated VIE assets	$ 391,543	$ 390,651
Maximum exposure to unconsolidated VIEs	56,113	55,976
Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	202,248	190,589
Maximum exposure to unconsolidated VIEs	35,952	34,431
Commercial and other real estate | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	28,469	31,377
Maximum exposure to unconsolidated VIEs	6,980	7,489
Corporate loans | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	10,502	7,088
Maximum exposure to unconsolidated VIEs	7,808	5,802
Other (including investment funds, airlines and shipping) | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	163,277	152,124
Maximum exposure to unconsolidated VIEs	$ 21,164	$ 21,140