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

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Number of additional shares authorized for issuance under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Common Stock Voting Rights Per Share

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Employee Stock Purchase Plan Purchase Price Of Shares As Percentage Of Fair Market Value Of Common Stock

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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