LEASES - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Leases [Abstract]
Property and equipment, at cost	$ 170		$ 168
Finance Lease, Right-Of-Use Asset, Accumulated Depreciation	29		$ 25
Operating cash flows related to operating leases	(4)	$ (5)
Financing cash flows related to finance leases	$ (3)	$ (3)
Weighted average remaining lease term (in years): operating	11 years 4 months 24 days		12 years 9 months 18 days
Weighted average remaining lease term (in years): finance	31 years 6 months		33 years 8 months 12 days
Current obligations of finance leases, included in Current portion of long-term debt	$ 7		$ 6
Finance leases, net of current obligations, included in Long-term debt	$ 81		$ 84
Weighted average discount rate: operating	4.59%		4.66%
Weighted average discount rate: finance	5.06%		5.06%
Operating Lease, Liability, Noncurrent	$ 46		$ 46
Operating Lease, Liability	$ 52		$ 52