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Supplemental Condensed Consolidating Financial Information - Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017
Condensed Statement of Income Captions [Line Items]
Net income (loss)	$ 197	$ 202	$ 107	$ (97)	$ (230)	$ 77	$ 506	$ (250)
Other comprehensive income, net of tax	1	$ 1	$ (6)	0		$ 1	(4)	1
Comprehensive income (loss)	198			(97)			502	(249)
Eliminations
Condensed Statement of Income Captions [Line Items]
Net income (loss)	(167)			167			(554)	364
Other comprehensive income, net of tax	(1)			0			4	(1)
Comprehensive income (loss)	(168)			167			(550)	363
Parent Guarantor | Reportable Legal Entities
Condensed Statement of Income Captions [Line Items]
Net income (loss)	197			(97)			506	(250)
Other comprehensive income, net of tax	1			0			(4)	1
Comprehensive income (loss)	198			(97)			502	(249)
Other Guarantors | Reportable Legal Entities
Condensed Statement of Income Captions [Line Items]
Net income (loss)	(3)			(86)			(7)	(152)
Other comprehensive income, net of tax	0			0			0	0
Comprehensive income (loss)	(3)			(86)			(7)	(152)
Non-Guarantors | Reportable Legal Entities
Condensed Statement of Income Captions [Line Items]
Net income (loss)	170			(81)			561	(212)
Other comprehensive income, net of tax	1			0			(4)	1
Comprehensive income (loss)	$ 171			$ (81)			$ 557	$ (211)

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