SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Asset Based Financing (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Variable Interest Entity
Total unconsolidated VIE assets	$ 265,758	$ 243,175
Maximum exposure to unconsolidated VIEs	55,534	47,014
Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	72,571	59,839
Maximum exposure to unconsolidated VIEs	32,112	25,939
Commercial and other real estate | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	23,918	15,370
Maximum exposure to unconsolidated VIEs	6,928	5,445
Corporate loans | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	6,731	4,725
Maximum exposure to unconsolidated VIEs	5,744	3,587
Hedge funds and equities | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	388	542
Maximum exposure to unconsolidated VIEs	53	58
Airplanes, ships and other assets | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	41,534	39,202
Maximum exposure to unconsolidated VIEs	$ 19,387	$ 16,849