LEASES - Lease Maturity Schedule (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating Leases
2020	$ 9
2021	8
2022	7
2023	7
2024	6
2026 and thereafter	27
Total lease payments	64
Less: Amounts representing interest	(15)
Total lease obligations	49	$ 52
Finance Leases
2020	12
2021	12
2022	12
2023	11
2024	13
2026 and thereafter	92
Total lease payments	152
Less: Amounts representing interest	(67)
Total lease obligations	$ 85	$ 90