GOODWILL AND INTANGIBLE ASSETS (Schedules) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Intangible assets, Cost	$ 1,823		$ 1,823		$ 1,812
Intangible assets, Accumulated Amortization	(651)		(651)		(605)
Total intangible assets, Net	1,172		1,172		1,207
Amortization expense	25	$ 22	49	$ 44
Remainder of 2019	49		49
Future Amortization Expense, 2020	97		97
Future Amortization Expense, 2021	97		97
Future Amortization Expense, 2022	91		91
Future Amortization Expense, 2023	88		88
Future Amortization Expense, 2024	86		86
Future Amortization Expense, Thereafter	428		428
Future Amortization Expense, Total	936		936
Intangible Assets Not Subject to Amortization - Tradenames
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Intangible assets, Cost	235		235		235
Total intangible assets, Net	235		235		235
Intangible Assets Not Subject to Amortization - Other
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Intangible assets, Cost	1		1		1
Total intangible assets, Net	1		$ 1		1
Customer-related intangibles
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period			18 years
Intangible assets, Cost	1,367		$ 1,367		1,355
Intangible assets, Accumulated Amortization	(517)		(517)		(478)
Total intangible assets, Net	850		$ 850		877
Non-compete agreements
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period			9 years
Intangible assets, Cost	3		$ 3		3
Intangible assets, Accumulated Amortization	(2)		(2)		(2)
Total intangible assets, Net	1		$ 1		1
Technology
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period			17 years
Intangible assets, Cost	104		$ 104		104
Intangible assets, Accumulated Amortization	(53)		(53)		(50)
Total intangible assets, Net	51		$ 51		54
Other
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period			9 years
Intangible assets, Cost	113		$ 113		114
Intangible assets, Accumulated Amortization	(79)		(79)		(75)
Total intangible assets, Net	34		$ 34		39
Total Amortizing Intangible Assets
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period			17 years
Intangible assets, Cost	1,587		$ 1,587		1,576
Intangible assets, Accumulated Amortization	(651)		(651)		(605)
Total intangible assets, Net	$ 936		$ 936		$ 971