SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Leveraged Leases (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 leveraged_lease	Dec. 30, 2019 USD ($) leveraged_lease
Leveraged Lease [Line Items]
Number of leveraged leases | leveraged_lease	1	1
Maximum
Leveraged Lease [Line Items]
Original term (up to) (years)	45 years
Leveraged Lease Investment | Disposal Group, Held-for-sale, Not Discontinued Operations
Leveraged Lease [Line Items]
Consideration for sale | $		$ 20