Balance Sheet Details - Product Warranty Liabilities (Detail) - USD ($) $ in Millions	3 Months Ended
	Jul. 29, 2016	Jul. 31, 2015	Jul. 29, 2016	Apr. 29, 2016
Movement In Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 70	$ 86
Expense accrued during the period	4	9
Warranty costs incurred	(13)	(14)
Balance at end of period	61	81
Standard Product Warranty Accrual, Balance Sheet Classification [Abstract]
Accrued expenses			$ 40	$ 48
Other long-term liabilities			21	22
Total warranty liabilities	$ 70	$ 86	$ 61	$ 70