SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Asset Based Financing (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Variable Interest Entity
Total unconsolidated VIE assets	$ 455,715	$ 425,355
Maximum exposure to unconsolidated VIEs	60,324	56,125
Commercial and other real estate | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	33,341	34,570
Maximum exposure to unconsolidated VIEs	7,073	7,758
Corporate loans | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	15,963	12,022
Maximum exposure to unconsolidated VIEs	10,588	7,654
Other (including investment funds, airlines and shipping) | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	198,866	167,613
Maximum exposure to unconsolidated VIEs	22,985	20,442
Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	248,170	214,205
Maximum exposure to unconsolidated VIEs	$ 40,646	$ 35,854