LEASE AND OTHER FINANCING OBLIGATIONS - Maturities (Details) $ in Millions	Jun. 30, 2019 USD ($)
Operating Lease Liabilities, Payments Due [Abstract]
Remainder of 2019	$ 30
2020	44
2021	29
2022	13
2023	9
Thereafter	48
Total future minimum lease payments	173
Less: Imputed interest	(28)
Operating lease liability	145
Finance Lease Liabilities, Payments, Due [Abstract]
Remainder of 2019	45
2020	87
2021	86
2022	75
2023	71
Thereafter	600
Total future minimum lease payments	964
Less: Imputed interest	(293)
Finance Lease, Liability	$ 671