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Common Stock and Stockholders' Equity - Additional Information (Detail) shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2019 shares | Apr. 30, 2019 USD ($) vote / shares shares
Restricted Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Period of vesting |  | 4 years
Unrecognized compensation cost - other than options | $ |  | $ 1,900
Unrecognized compensation cost recognized over weighted-average period |  | 3 years 1 month 6 days
Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Period of vesting |  | 5 years
Unrecognized compensation cost recognized over weighted-average period |  | 2 years 1 month 6 days
Period of which options become exercisable |  | 10 years
Unrecognized compensation cost | $ |  | $ 62
Class A |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common stock, outstanding (in shares) |  | 161
Common stock, votes per share | vote / shares |  | 1
Class B |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common stock, outstanding (in shares) |  | 64
Common stock, votes per share | vote / shares |  | 10
2012 Equity Incentive Plan | Class A |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share reserve increased (in shares) | 11 |
Common stock available for future grants (in shares) |  | 72
Employee Stock Purchase Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common stock available for future grants (in shares) |  | 6
Percentage of fair market value of stock at which employees are granted shares |  | 85.00%

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