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Supplemental Condensed Consolidating Financial Information - Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Condensed Statement of Income Captions [Line Items]
Net (loss) income	$ (97)	$ 42	$ (250)	$ 99
Other comprehensive income, net of tax	0	(1)	1	7
Comprehensive (loss) income	(97)	41	(249)	106
Eliminations
Condensed Statement of Income Captions [Line Items]
Net (loss) income	166	(65)	363	(147)
Other comprehensive income, net of tax	0	1	(1)	(6)
Comprehensive (loss) income	166	(64)	362	(153)
Parent Guarantor | Reportable Legal Entities
Condensed Statement of Income Captions [Line Items]
Net (loss) income	(97)	42	(250)	99
Other comprehensive income, net of tax	0	(1)	1	7
Comprehensive (loss) income	(97)	41	(249)	106
Other Guarantors | Reportable Legal Entities
Condensed Statement of Income Captions [Line Items]
Net (loss) income	(98)	8	(164)	11
Other comprehensive income, net of tax	0	0	0	0
Comprehensive (loss) income	(98)	8	(164)	11
Non-Guarantors | Reportable Legal Entities
Condensed Statement of Income Captions [Line Items]
Net (loss) income	(68)	57	(199)	136
Other comprehensive income, net of tax	0	(1)	1	6
Comprehensive (loss) income	$ (68)	$ 56	$ (198)	$ 142

X

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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