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Stockholders' Equity - Number and Value of Shares Netted for Employee Taxes (Detail) - Restricted Stock Units - USD ($)
shares in Millions, $ in Millions
6 Months Ended
Oct. 30, 2020
Oct. 25, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares withheld for taxes 1 1
Fair value of shares withheld $ 34 $ 74