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Balance Sheet Details - Product Warranty Liabilities (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Oct. 30, 2015
Oct. 24, 2014
Oct. 30, 2015
Oct. 24, 2014
Oct. 30, 2015
Apr. 24, 2015
Movement In Standard Product Warranty Accrual [Roll Forward]            
Balance at beginning of period $ 81 $ 104 $ 86 $ 110    
Expense accrued during the period 13 9 22 19    
Warranty costs incurred (14) (16) (28) (32)    
Balance at end of period 80 97 80 97    
Standard Product Warranty Accrual, Balance Sheet Classification [Abstract]            
Accrued expenses         $ 53 $ 58
Other long-term liabilities         27 28
Total warranty liabilities $ 81 $ 104 $ 86 $ 110 $ 80 $ 86