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Supplemental Condensed Consolidating Financial Information - Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net income (loss) | $ 202 | $ (230) | $ 309 | $ (153)
Other comprehensive income, net of tax | 2 | 0 | (5) | 1
Comprehensive income (loss) | 204 | (230) | 304 | (152)
Eliminations |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net income (loss) | (249) | 241 | (387) | 197
Other comprehensive income, net of tax | (2) | 0 | 5 | (1)
Comprehensive income (loss) | (251) | 241 | (382) | 196
Parent Guarantor | Reportable Legal Entities |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net income (loss) | 202 | (230) | 309 | (153)
Other comprehensive income, net of tax | 2 | 0 | (5) | 1
Comprehensive income (loss) | 204 | (230) | 304 | (152)
Other Guarantors | Reportable Legal Entities |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net income (loss) | 0 | (63) | 1 | (66)
Other comprehensive income, net of tax | 0 | 0 | 0 | 0
Comprehensive income (loss) | 0 | (63) | 1 | (66)
Non-Guarantors | Reportable Legal Entities |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net income (loss) | 249 | (178) | 386 | (131)
Other comprehensive income, net of tax | 2 | 0 | (5) | 1
Comprehensive income (loss) | $ 251 | $ (178) | $ 381 | $ (130)

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e557-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580 + Details
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