LEASES - Supplemental Balance Sheet Information (Details) $ in Millions	Sep. 30, 2019 USD ($)
Leases [Abstract]
Operating lease ROU assets, included in Other assets	$ 48
Current operating lease liabilities, included in Accrued expenses and other current liabilities	6
Noncurrent operating lease liabilities, included in Other liabilities	47
Total operating lease liabilities	53
Property and equipment, at cost	166
Accumulated amortization	(23)
Property and equipment, net	143
Current obligations of finance leases, included in Current portion of long-term debt	6
Finance leases, net of current obligations, included in Long-term debt	83
Total finance lease liabilities	$ 89