LOANS - Corporate Lease Financing (Details) - Corporate - USD ($) $ in Billions	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2019
Lessor, Lease, Description [Line Items]
Direct financing and leveraged assets, financing receivable		$ 1.4
Direct financing and leveraged assets, weighted average remaining lease term	3 years 6 months
Direct financing and leveraged assets, residual value of leased assets		0.9
Amount covered by residual value guarantees		$ 0.3