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CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Statements of Cash Flows (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Net cash (used) provided by operating activities	$ 393	$ 225
Net cash used in investing activities	(965)	(174)
Net cash provided (used) by financing activities	583	(35)
Increase (decrease) in cash	11	16
Cash-beginning of period	20	12
Cash-end of period	31	28
Parent | Reportable Legal Entity
Net cash (used) provided by operating activities	(433)	(403)
Net cash used in investing activities	(3)	(2)
Net cash provided (used) by financing activities	429	409
Increase (decrease) in cash	(7)	4
Cash-beginning of period	7
Cash-end of period		4
Combined Guarantor Subsidiaries | Reportable Legal Entity
Net cash (used) provided by operating activities	645	621
Net cash used in investing activities	(921)	(90)
Net cash provided (used) by financing activities	278	(536)
Increase (decrease) in cash	2	(5)
Cash-beginning of period	8	12
Cash-end of period	10	7
Combined Non-Guarantor Subsidiaries | Reportable Legal Entity
Net cash (used) provided by operating activities	181	7
Net cash used in investing activities	(41)	(82)
Net cash provided (used) by financing activities	(124)	92
Increase (decrease) in cash	16	17
Cash-beginning of period	5
Cash-end of period	$ 21	$ 17

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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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