Supplemental Financial Information - Product Warranty Liabilities (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 30, 2020	Oct. 25, 2019	Oct. 30, 2020	Oct. 25, 2019	Oct. 30, 2020	Apr. 24, 2020
Movement In Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 37	$ 39	$ 41	$ 40
Expense accrued during the period	4	7	5	12
Warranty costs incurred	(6)	(6)	(11)	(12)
Balance at end of period	35	40	35	40
Standard Product Warranty Accrual, Balance Sheet Classification [Abstract]
Accrued expenses					$ 23	$ 26
Other long-term liabilities					12	15
Total warranty liabilities	$ 35	$ 40	$ 35	$ 40	$ 35	$ 41