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Supplemental Condensed Consolidating Financial Information - Condensed Consolidating Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Statement of Income Captions [Line Items]
Net income (loss)	$ 201	$ 197	$ 202	$ 107	$ (262)	$ (97)	$ (230)	$ 77	$ 707	$ (512)	$ 52
Other comprehensive income (loss), net of tax									(2)	(3)	2
Comprehensive income (loss)									705	(515)	54
Parent Issuer
Condensed Statement of Income Captions [Line Items]
Net income (loss)									707	(512)	52
Other comprehensive income (loss), net of tax									(2)	(3)	2
Comprehensive income (loss)									705	(515)	54
Reportable Legal Entities | Parent Issuer
Condensed Statement of Income Captions [Line Items]
Net income (loss)									707	(512)	52
Other comprehensive income (loss), net of tax									(2)	(3)	2
Comprehensive income (loss)									705	(515)	54
Reportable Legal Entities | Other Guarantor
Condensed Statement of Income Captions [Line Items]
Net income (loss)									(47)	(164)	1
Other comprehensive income (loss), net of tax									0	0	0
Comprehensive income (loss)									(47)	(164)	1
Reportable Legal Entities | Non-Guarantors
Condensed Statement of Income Captions [Line Items]
Net income (loss)									793	(390)	119
Other comprehensive income (loss), net of tax									(2)	(2)	1
Comprehensive income (loss)									791	(392)	120
Eliminations
Condensed Statement of Income Captions [Line Items]
Net income (loss)									(746)	554	(120)
Other comprehensive income (loss), net of tax									2	2	(1)
Comprehensive income (loss)									$ (744)	$ 556	$ (121)

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