GOODWILL AND INTANGIBLE ASSETS (Schedules) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Intangible assets, Cost	$ 1,812		$ 1,812		$ 1,812
Intangible assets, Accumulated Amortization	(674)		(674)		(605)
Total intangible assets, Net	1,138		1,138		1,207
Amortization expense	23	$ 22	72	$ 66
Remainder of 2019	24		24
Future Amortization Expense, 2020	96		96
Future Amortization Expense, 2021	89		89
Future Amortization Expense, 2022	86		86
Future Amortization Expense, 2023	85		85
Future Amortization Expense, 2024	81		81
Future Amortization Expense, Thereafter	441		441
Future Amortization Expense, Total	902		902
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	1,359		$ 1,359		1,355
Intangible assets, Accumulated Amortization	(536)		(536)		(478)
Total intangible assets, Net	823		$ 823		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	(54)		(54)		(50)
Total intangible assets, Net	50		$ 50		54
Other
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period			9 years
Intangible assets, Cost	110		$ 110		114
Intangible assets, Accumulated Amortization	(82)		(82)		(75)
Total intangible assets, Net	28		$ 28		39
Total Amortizing Intangible Assets
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period			17 years
Intangible assets, Cost	1,576		$ 1,576		1,576
Intangible assets, Accumulated Amortization	(674)		(674)		(605)
Total intangible assets, Net	$ 902		$ 902		$ 971