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Net Income per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Numerator: |  |  |  |
Net income | $ 107 | $ 77 |  |
Denominator: |  |  |  |
Shares outstanding at the beginning of the period (in shares) |  |  | 59 | 56
1.625% Exchange (in shares) | 1 | 0 |  |
Denominator for basic net income per share (in shares) | 60 | 56 |  |
Effect of dilutive securities: |  |  |  |
Convertible senior notes (in shares) | 1 | 0 |  |
1.125% Warrants (in shares) | 4 | 0 |  |
Denominator for diluted net income per share (in shares) | 65 | 56 |  |
Net income per share: |  |  |  |
Basic (in dollars per share) | $ 1.79 | $ 1.38 |  |
Diluted (in dollars per share) | $ 1.64 | $ 1.37 |  |
Cash Convertible Senior Notes Due 2020, Warrants |  |  |  |
Net income per share: |  |  |  |
Stated percentage of warrants | 1.125% |  |  |
Convertible Notes | 1.625% Convertible Notes |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Percentage of contractual interest rate | 1.625% |  |  |

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