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Supplemental Financial Information - Product Warranty Liabilities (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Oct. 25, 2019
Oct. 26, 2018
Oct. 25, 2019
Oct. 26, 2018
Oct. 25, 2019
Apr. 26, 2019
Movement In Standard Product Warranty Accrual [Roll Forward]            
Balance at beginning of period $ 39 $ 38 $ 40 $ 40    
Expense accrued during the period 7 6 12 10    
Warranty costs incurred (6) (5) (12) (11)    
Balance at end of period 40 39 40 39    
Standard Product Warranty Accrual, Balance Sheet Classification [Abstract]            
Accrued expenses         $ 26 $ 25
Other long-term liabilities         14 15
Total warranty liabilities $ 39 $ 38 $ 40 $ 40 $ 40 $ 40