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Revenue - Summary of Activity Related to the Balances in Condensed Consolidated Balance Sheets (Detail) - USD ($)
$ in Millions
Jan. 25, 2019
Apr. 27, 2018
Jan. 26, 2018
Apr. 28, 2017
Deferred Revenue And Credits [Line Items]        
Total deferred commissions $ 139 $ 137 $ 120 $ 113
Other Current Assets        
Deferred Revenue And Credits [Line Items]        
Total deferred commissions 64 66    
Other Noncurrent Assets        
Deferred Revenue And Credits [Line Items]        
Total deferred commissions $ 75 $ 71