SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Asset Based Financing (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Variable Interest Entity
Total unconsolidated VIE assets	$ 238,882	$ 243,175
Maximum exposure to unconsolidated VIEs	48,503	47,014
Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	64,343	59,839
Maximum exposure to unconsolidated VIEs	27,177	25,939
Commercial and other real estate | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	15,795	15,370
Maximum exposure to unconsolidated VIEs	5,177	5,445
Corporate loans | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	8,567	4,725
Maximum exposure to unconsolidated VIEs	6,748	3,587
Hedge funds and equities | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	469	542
Maximum exposure to unconsolidated VIEs	55	58
Airplanes, ships and other assets | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	39,512	39,202
Maximum exposure to unconsolidated VIEs	$ 15,197	$ 16,849