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Supplemental Condensed Consolidating Financial Information - Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Condensed Statement of Income Captions [Line Items]
Net income	$ 107	$ 77
Other comprehensive income, net of tax	(7)	1
Comprehensive income	100	78
Eliminations
Condensed Statement of Income Captions [Line Items]
Net income	(138)	(44)
Other comprehensive income, net of tax	7	(1)
Comprehensive income	(131)	(45)
Parent Guarantor | Reportable Legal Entities
Condensed Statement of Income Captions [Line Items]
Net income	107	77
Other comprehensive income, net of tax	(7)	1
Comprehensive income	100	78
Other Guarantors | Reportable Legal Entities
Condensed Statement of Income Captions [Line Items]
Net income	1	(3)
Other comprehensive income, net of tax	0	0
Comprehensive income	1	(3)
Non-Guarantors | Reportable Legal Entities
Condensed Statement of Income Captions [Line Items]
Net income	137	47
Other comprehensive income, net of tax	(7)	1
Comprehensive income	$ 130	$ 48

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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