LEASE AND OTHER FINANCING OBLIGATIONS - Maturities (Details) $ in Millions	Dec. 31, 2019 USD ($)
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2020	$ 28
2021	18
2022	11
2023	7
2024	5
Thereafter	18
Total future minimum lease payments	87
Less: Imputed interest	(12)
Operating lease liability	$ 75
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Other Liabilities Noncurrent
Finance Lease, Liability, Payment, Due [Abstract]
2020	$ 101
2021	99
2022	88
2023	81
2024	72
Thereafter	536
Total future minimum lease payments	977
Less: Imputed interest	(281)
Finance Lease, Liability	$ 696