Stockholders' Equity - Additional Information (Details) $ in Millions	6 Months Ended
Jul. 31, 2021 USD ($) vote shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost \| $	$ 3
Employee Stock
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%
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 \| $	$ 2,100
Unrecognized compensation cost recognized over weighted-average period	3 years
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	1 year
Period of which options become exercisable	10 years
Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, outstanding (in shares)	191,000,000
Common stock, votes per share \| vote	1
Class B
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, outstanding (in shares)	57,000,000
Common stock, votes per share \| vote	10
2012 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for future grants (in shares)	58,000,000
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for future grants (in shares)	4,000,000

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

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