LEASES - Lease Maturity (Details) $ in Millions	Sep. 30, 2019 USD ($)
Operating Leases
Remainder of 2019	$ 2
2020	8
2021	8
2022	7
2023	7
2024 and thereafter	38
Total lease payments	70
Less: Amounts representing interest	(17)
Total lease obligations	53
Finance Leases
Remainder of 2019	3
2020	11
2021	11
2022	11
2023	10
2024 and thereafter	111
Total lease payments	157
Less: Amounts representing interest	(68)
Total lease obligations	$ 89