LOANS - Corporate Lease Financing (Details) - Corporate $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Lessor, Lease, Description [Line Items]
Direct financing and leveraged leases, financing receivables	$ 1,500
Direct financing and leveraged leases, interest income	$ 21
Direct financing and leveraged leases, weighted average remaining lease term	4 years
Direct financing and leveraged leases, residual value of leased assets	$ 900
Amount covered by residual value guarantees	$ 300