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Supplemental Condensed Consolidating Financial Information - Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Condensed Statement of Income Captions [Line Items]
Net income	$ 77	$ 24
Other comprehensive income, net of tax	1	6
Comprehensive income	78	30
Eliminations
Condensed Statement of Income Captions [Line Items]
Net income	(44)	(35)
Other comprehensive income, net of tax	(1)	(5)
Comprehensive income	(45)	(40)
Parent Guarantor | Reportable Legal Entities
Condensed Statement of Income Captions [Line Items]
Net income	77	24
Other comprehensive income, net of tax	1	6
Comprehensive income	78	30
Other Guarantors | Reportable Legal Entities
Condensed Statement of Income Captions [Line Items]
Net income	(3)	2
Other comprehensive income, net of tax	0	0
Comprehensive income	(3)	2
Non-Guarantors | Reportable Legal Entities
Condensed Statement of Income Captions [Line Items]
Net income	47	33
Other comprehensive income, net of tax	1	5
Comprehensive income	$ 48	$ 38

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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