SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Asset Based Financing (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Variable Interest Entity
Total unconsolidated VIE assets	$ 475,867	$ 425,355
Maximum exposure to unconsolidated VIEs	60,276	56,125
Commercial and other real estate | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	33,741	34,570
Maximum exposure to unconsolidated VIEs	6,841	7,758
Corporate loans | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	18,465	12,022
Maximum exposure to unconsolidated VIEs	11,363	7,654
Other (including investment funds, airlines and shipping) | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	215,732	167,613
Maximum exposure to unconsolidated VIEs	23,120	20,442
Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	267,938	214,205
Maximum exposure to unconsolidated VIEs	$ 41,324	$ 35,854