LEASES - Supplemental Balance Sheet Information (Details) $ in Millions	Mar. 31, 2019 USD ($)
Leases [Abstract]
Operating lease ROU assets, included in Other assets	$ 55
Current operating lease liabilities, included in Accrued expenses and other current liabilities	7
Noncurrent operating lease liabilities, included in Other liabilities	53
Total operating lease liabilities	60
Property and equipment, at cost	248
Accumulated amortization	(43)
Property and equipment, net	205
Current obligations of finance leases, included in Current portion of long-term debt	11
Finance leases, net of current obligations, included in Long-term debt	140
Total finance lease liabilities	$ 151