LEASES - Schedule of Future Minimum Lease Payments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Capital Leases
2019	$ 7
2020	7
2021	8
2022	8
2023	6
Thereafter	88
Total minimum lease payments	124
Less: imputed interest	(62)
Present value of lease liabilities	62
Operating Leases
2019	123
2020	94
2021	86
2022	72
2023	64
Thereafter	212
Total minimum lease payments	651
Operating lease rent expense	$ 152	$ 155