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Supplemental Condensed Consolidating Financial Information - Condensed Consolidating Statements of Comprehensive (Loss) Income (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net (loss) income | $ (262) | $ (97) | $ (230) | $ 77 | $ (47) | $ 42 | $ 33 | $ 24 | $ (512) | $ 52 | $ 143
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | (3) | 2 | (3)
Comprehensive (loss) income |  |  |  |  |  |  |  |  | (515) | 54 | 140
Parent Guarantor |  |  |  |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  |  |  |  |  |  |  |  | (512) | 52 | 143
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | (3) | 2 | (3)
Comprehensive (loss) income |  |  |  |  |  |  |  |  | (515) | 54 | 140
Reportable Legal Entities | Parent Guarantor |  |  |  |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  |  |  |  |  |  |  |  | (512) | 52 | 143
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | (3) | 2 | (3)
Comprehensive (loss) income |  |  |  |  |  |  |  |  | (515) | 54 | 140
Reportable Legal Entities | Other Guarantors |  |  |  |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  |  |  |  |  |  |  |  | (166) | 9 | 15
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | 0 | 0 | 0
Comprehensive (loss) income |  |  |  |  |  |  |  |  | (166) | 9 | 15
Reportable Legal Entities | Non-Guarantors |  |  |  |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  |  |  |  |  |  |  |  | (388) | 110 | 175
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | (2) | 1 | (3)
Comprehensive (loss) income |  |  |  |  |  |  |  |  | (390) | 111 | 172
Eliminations |  |  |  |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  |  |  |  |  |  |  |  | 554 | (119) | (190)
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | 2 | (1) | 3
Comprehensive (loss) income |  |  |  |  |  |  |  |  | $ 556 | $ (120) | $ (187)

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e557-108580 + Details
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