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Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 201 | $ 197 | $ 202 | $ 107 | $ (262) | $ (97) | $ (230) | $ 77 | $ 707 | $ (512) | $ 52 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Shares outstanding at the beginning of the period (in shares) |  |  |  |  | 59.3 |  |  |  |  | 59.3 | 55.8 | 55.1
Weighted-average number of shares issued: |  |  |  |  |  |  |  |  |  |  |  |
Exchange of 1.625% Convertible Notes (in shares) |  |  |  |  |  |  |  |  | 1.4 | 0.1 | 0.0 |
Conversion of 1.625% Convertible Notes (in shares) |  |  |  |  |  |  |  |  | 0.2 | 0.0 | 0.0 |
Stock-based compensation (in shares) |  |  |  |  |  |  |  |  | 0.2 | 0.5 | 0.3 |
Denominator for basic net income (loss) per share (in shares) |  |  |  |  |  |  |  |  | 61.1 | 56.4 | 55.4 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
1.125% Warrants (in shares) |  |  |  |  |  |  |  |  | 4.8 | 0.0 | 0.5 |
1.625% Convertible Notes (in shares) |  |  |  |  |  |  |  |  | 0.4 | 0.0 | 0.0 |
Share-based compensation (in shares) |  |  |  |  |  |  |  |  | 0.3 | 0.0 | 0.3 |
Denominator for diluted net (loss) income per share (in shares) |  |  |  |  |  |  |  |  | 66.6 | 56.4 | 56.2 |
Net income (loss) per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 3.24 | $ 3.22 | $ 3.29 | $ 1.79 | $ (4.59) | $ (1.70) | $ (4.10) | $ 1.38 | $ 11.57 | $ (9.07) | $ 0.93 |
Diluted (in dollars per share) | $ 3.01 | $ 2.90 | $ 3.02 | $ 1.64 | $ (4.59) | $ (1.70) | $ (4.10) | $ 1.37 | $ 10.61 | $ (9.07) | $ 0.92 |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation (in shares) |  |  |  |  |  |  |  |  | 0.0 | 0.3 | 0.0 |
1.125% Warrants |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Potentially dilutive common shares excluded from calculations (in shares) |  |  |  |  |  |  |  |  | 0.0 | 1.9 | 0.0 |
1.625% Notes |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Potentially dilutive common shares excluded from calculations (in shares) |  |  |  |  |  |  |  |  | 0.0 | 0.4 | 0.0 |
Stated interest rate | 1.625% |  |  |  |  |  |  |  | 1.625% |  |  |
1.125% Warrants |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate | 1.125% |  |  |  |  |  |  |  | 1.125% |  |  |

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