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Net Income (Loss) per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
Numerator: |  |  |  |  |  |  |  |
Net income (loss) | $ 202 | $ (230) | $ 309 | $ (153) |  |  |  |
Denominator: |  |  |  |  |  |  |  |
Shares outstanding at the beginning of the period (in shares) |  |  |  |  | 61 | 59 | 56 | 56
1.625% Exchange (in shares) | 0 | 0 | 2 | 0 |  |  |  |
Denominator for basic net income per share (in shares) | 61 | 56 | 61 | 56 |  |  |  |
Effect of dilutive securities: |  |  |  |  |  |  |  |
1.625% Convertible Notes (in shares) | 1 | 0 | 0 | 0 |  |  |  |
1.125% Warrants (in shares) | 5 | 0 | 5 | 0 |  |  |  |
Denominator for diluted net income per share (in shares) | 67 | 56 | 66 | 56 |  |  |  |
Net income (loss) per share: |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 3.29 | $ (4.10) | $ 5.10 | $ (2.74) |  |  |  |
Diluted (in dollars per share) | $ 3.02 | $ (4.10) | $ 4.68 | $ (2.74) |  |  |  |
Cash Convertible Senior Notes Due 2020, Warrants |  |  |  |  |  |  |  |
Potentially dilutive common shares excluded from calculations: |  |  |  |  |  |  |  |
Stated percentage of warrants | 1.125% |  | 1.125% |  |  |  |  |
1.125% Warrants |  |  |  |  |  |  |  |
Potentially dilutive common shares excluded from calculations: |  |  |  |  |  |  |  |
1.125% Warrants (in shares) | 0 | 2 | 0 | 1 |  |  |  |
Convertible Notes | 1.625% Convertible Notes |  |  |  |  |  |  |  |
Potentially dilutive common shares excluded from calculations: |  |  |  |  |  |  |  |
Percentage of contractual interest rate | 1.625% |  | 1.625% |  |  |  |  |

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