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Balance Sheet Details - Product Warranty Liabilities (Detail) - USD ($)
$ in Millions
12 Months Ended
Apr. 27, 2018
Apr. 28, 2017
Apr. 27, 2018
Apr. 28, 2017
Movement In Standard Product Warranty Accrual [Roll Forward]        
Balance at beginning of period $ 50 $ 70    
Expense accrued during the period 16 17    
Warranty costs incurred (26) (37)    
Balance at end of period 40 50    
Standard Product Warranty Accrual, Balance Sheet Classification [Abstract]        
Accrued expenses     $ 25 $ 33
Other long-term liabilities     15 17
Total warranty liabilities $ 50 $ 50 $ 40 $ 50