SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Asset Based Financing (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Variable Interest Entity
Total unconsolidated VIE assets	$ 423,936	$ 425,355
Maximum exposure to unconsolidated VIEs	59,127	56,125
Commercial and other real estate | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	32,535	34,570
Maximum exposure to unconsolidated VIEs	7,091	7,758
Corporate loans | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	15,535	12,022
Maximum exposure to unconsolidated VIEs	10,742	7,654
Other (including investment funds, airlines and shipping) | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	166,460	167,613
Maximum exposure to unconsolidated VIEs	21,264	20,442
Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	214,530	214,205
Maximum exposure to unconsolidated VIEs	$ 39,097	$ 35,854