GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Intangible assets, Cost	$ 1,725		$ 1,725		$ 1,653
Intangible assets, Accumulated Amortization	(559)		(559)		(534)
Total intangible assets, Net	1,166		1,166		1,119
Amortization expense	22	$ 18	44	$ 35
Remainder of 2018	44		44
Future Amortization Expense, 2019	88		88
Future Amortization Expense, 2020	87		87
Future Amortization Expense, 2021	81		81
Future Amortization Expense, 2022	78		78
Future Amortization Expense, 2023	77		77
Future Amortization Expense, Thereafter	475		475
Future Amortization Expense, Total	930		930
Intangible Assets Not Subject to Amortization - Tradenames [Member]
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 [Member]
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 [Member]
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period			18 years
Intangible assets, Cost	1,298		$ 1,298		1,210
Intangible assets, Accumulated Amortization	(440)		(440)		(404)
Total intangible assets, Net	858		$ 858		806
Noncompete Agreements [Member]
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period			8 years
Intangible assets, Cost	3		$ 3		7
Intangible assets, Accumulated Amortization	(2)		(2)		(5)
Total intangible assets, Net	1		$ 1		2
Technology [Member]
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period			17 years
Intangible assets, Cost	96		$ 96		95
Intangible assets, Accumulated Amortization	(47)		(47)		(45)
Total intangible assets, Net	49		$ 49		50
Other [Member]
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period			10 years
Intangible assets, Cost	92		$ 92		105
Intangible assets, Accumulated Amortization	(70)		(70)		(80)
Total intangible assets, Net	22		$ 22		25
Total Amortizing Intangible Assets [Member]
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period			17 years
Intangible assets, Cost	1,489		$ 1,489		1,417
Intangible assets, Accumulated Amortization	(559)		(559)		(534)
Total intangible assets, Net	$ 930		$ 930		$ 883