Common Stock and Stockholders' Equity - Additional Information (Detail) shares in Millions, $ in Millions	1 Months Ended	9 Months Ended
Mar. 31, 2018 shares	Oct. 31, 2018 USD ($) vote / shares shares
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 6 months
Period of which options become exercisable		10 years
Unrecognized compensation cost \| $		$ 84
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 \| $		$ 1,300
Unrecognized compensation cost recognized over weighted-average period		2 years 9 months 18 days
Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, outstanding (in shares)		151
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)		67
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)		65
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for future grants (in shares)		7
Percentage of fair market value of stock at which employees are granted shares		85.00%

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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