SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Asset Based Financing (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Variable Interest Entity
Total unconsolidated VIE assets	$ 232,508	$ 325,531
Maximum exposure to unconsolidated VIEs	43,096	43,354
Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	50,721	52,435
Maximum exposure to unconsolidated VIEs	21,027	21,943
Commercial and other real estate | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	8,971	8,784
Maximum exposure to unconsolidated VIEs	3,068	2,368
Corporate loans | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	2,763	4,051
Maximum exposure to unconsolidated VIEs	1,706	2,684
Hedge funds and equities | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	499	370
Maximum exposure to unconsolidated VIEs	59	54
Airplanes, ships and other assets | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	38,488	39,230
Maximum exposure to unconsolidated VIEs	$ 16,194	$ 16,837