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Revenue - Summary of Activity Related to the Balances in Condensed Consolidated Balance Sheets (Detail) - USD ($)
$ in Millions
Oct. 26, 2018
Apr. 27, 2018
Oct. 27, 2017
Apr. 28, 2017
Deferred Revenue And Credits [Line Items]        
Total deferred commissions $ 131 $ 137 $ 115 $ 113
Other Current Assets        
Deferred Revenue And Credits [Line Items]        
Total deferred commissions 61 66    
Other Noncurrent Assets        
Deferred Revenue And Credits [Line Items]        
Total deferred commissions $ 70 $ 71