LEASES - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease ROU assets, included in Other assets	$ 46	$ 46
Current operating lease liabilities, included in Accrued expenses and other current liabilities	6	6
Noncurrent operating lease liabilities, included in Other liabilities	46	46
Total operating lease liabilities	52	52
Property and equipment, at cost	170	168
Accumulated amortization	(29)	(25)
Property and equipment, net	141	143
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
Total finance lease liabilities	$ 88	$ 90