SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Asset Based Financing (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Variable Interest Entity
Total unconsolidated VIE assets	$ 337,339	$ 291,992
Maximum exposure to unconsolidated VIEs	57,989	55,534
Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	143,776	98,805
Maximum exposure to unconsolidated VIEs	35,247	32,112
Commercial and other real estate | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	28,770	23,918
Maximum exposure to unconsolidated VIEs	6,803	6,928
Corporate loans | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	8,701	6,973
Maximum exposure to unconsolidated VIEs	7,254	5,744
Hedge funds and equities | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	485	388
Maximum exposure to unconsolidated VIEs	53	53
Airplanes, ships and other assets | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	105,820	67,526
Maximum exposure to unconsolidated VIEs	$ 21,137	$ 19,387