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%

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

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