LEASES - Supplemental Balance Sheet Information (Details) $ in Millions	Sep. 30, 2019 USD ($)
Operating Leases
Lease assets, non-current	$ 222
Lease liabilities, current	38
Lease liabilities, non-current	213
Total lease liabilities	$ 251
Weighted average remaining lease term (in years)	9 years 7 months 17 days
Weighted average discount rate	5.60%
Finance Leases
Lease assets, non-current	$ 16
Lease liabilities, current	5
Lease liabilities, non-current	34
Total lease liabilities	$ 39
Weighted average remaining lease term (in years)	7 years 4 months 13 days
Weighted average discount rate	9.00%