GOODWILL AND INTANGIBLE ASSETS (Schedules) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Intangible assets, Cost	$ 1,828		$ 1,812
Intangible assets, Accumulated Amortization	(628)		(605)
Total intangible assets, Net	1,200		1,207
Amortization expense	24	$ 22
Remainder of 2019	74
Future Amortization Expense, 2020	97
Future Amortization Expense, 2021	97
Future Amortization Expense, 2022	91
Future Amortization Expense, 2023	88
Future Amortization Expense, 2024	86
Future Amortization Expense, Thereafter	431
Future Amortization Expense, Total	964
Intangible Assets Not Subject to Amortization - Tradenames
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Intangible assets, Cost	235		235
Total intangible assets, Net	235		235
Intangible Assets Not Subject to Amortization - Other
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Intangible assets, Cost	1		1
Total intangible assets, Net	$ 1		1
Customer-related intangibles
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period	18 years
Intangible assets, Cost	$ 1,371		1,355
Intangible assets, Accumulated Amortization	(497)		(478)
Total intangible assets, Net	$ 874		877
Non-compete agreements
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period	9 years
Intangible assets, Cost	$ 3		3
Intangible assets, Accumulated Amortization	(2)		(2)
Total intangible assets, Net	$ 1		1
Technology
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period	17 years
Intangible assets, Cost	$ 104		104
Intangible assets, Accumulated Amortization	(51)		(50)
Total intangible assets, Net	$ 53		54
Other
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period	9 years
Intangible assets, Cost	$ 114		114
Intangible assets, Accumulated Amortization	(78)		(75)
Total intangible assets, Net	$ 36		39
Total Amortizing Intangible Assets
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period	17 years
Intangible assets, Cost	$ 1,592		1,576
Intangible assets, Accumulated Amortization	(628)		(605)
Total intangible assets, Net	$ 964		$ 971