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Net Income (Loss) per Share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Summary of denominators for the computation of basic and diluted net income (loss) per share | The following table sets forth the calculation of basic and diluted net income (loss) per share:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (In millions, except net income per share)
Numerator: |  |  |  |  |  |  |
Net income (loss) | $ | 202 |  |  | $ | (230 | ) |  | $ | 309 |  |  | $ | (153 | )
Denominator: |  |  |  |  |  |  |
Shares outstanding at the beginning of the period | 61 |  |  | 56 |  |  | 59 |  |  | 56 |
Weighted-average number of shares issued: |  |  |  |  |  |  |
1.625% Exchange (1) | — |  |  | — |  |  | 2 |  |  | — |
Denominator for basic net income per share | 61 |  |  | 56 |  |  | 61 |  |  | 56 |
Effect of dilutive securities: |  |  |  |  |  |  |
1.625% Convertible Notes (1) | 1 |  |  | — |  |  | — |  |  | — |
1.125% Warrants (1) | 5 |  |  | — |  |  | 5 |  |  | — |
Denominator for diluted net income per share | 67 |  |  | 56 |  |  | 66 |  |  | 56 |
Net income (loss) per share: (2) |  |  |  |  |  |  |
Basic | $ | 3.29 |  |  | $ | (4.10 | ) |  | $ | 5.10 |  |  | $ | (2.74 | )
Diluted | $ | 3.02 |  |  | $ | (4.10 | ) |  | $ | 4.68 |  |  | $ | (2.74 | )
Potentially dilutive common shares excluded from calculations: |  |  |  |  |  |  |
1.125% Warrants (1) | — |  |  | 2 |  |  | — |  |  | 1 |
______________________________
(1) | For more information and definitions regarding the 1.625% Exchange and the 1.625% Convertible Notes, refer to Note 7, “Debt.” For more information regarding the 1.125% Warrants, refer to Note 9, “Stockholders' Equity.” The dilutive effect of all potentially dilutive common shares is calculated using the treasury stock method. Certain potentially dilutive common shares issuable are not included in the computation of diluted net income (loss) per share because to do so would be anti-dilutive. For the three and six months ended June 30, 2017, the 1.125% Warrants were not included in diluted shares outstanding because to do so would have been anti-dilutive.
(2) | Source data for calculations in thousands.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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