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Common Stock and Stockholders' Equity - Additional Information (Detail) $ in Millions |  | 1 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 31, 2019 USD ($) shares | Mar. 31, 2019 shares | Jul. 31, 2019 USD ($) vote / shares shares
Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Period of vesting | 3 years |  | 4 years
Unrecognized compensation cost - other than options | $ | $ 1,700 |  | $ 1,700
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
Period of which options become exercisable |  |  | 10 years
Unrecognized compensation cost | $ | $ 52 |  | $ 52
Class A |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock, outstanding (in shares) | 164,000,000 |  | 164,000,000
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) | 64,000,000 |  | 64,000,000
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) |  | 11,000,000 |
Common stock available for future grants (in shares) | 71,000,000 |  | 71,000,000
Employee Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of fair market value of stock at which employees are granted shares |  |  | 85.00%
Employee Stock Purchase Plan | Class A |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock available for future grants (in shares) | 6,000,000 |  | 6,000,000

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