Restructuring and Other Charges - Activities Related to Restructuring Reserves (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 28, 2016	Oct. 30, 2015	Oct. 28, 2016	Oct. 30, 2015
Restructuring And Related Activities [Abstract]
Balance at beginning of period			$ 45	$ 0
Net charges	$ 0	$ 1	0	28
Cash payments			(42)	(23)
Balance at end of period	$ 3	$ 5	$ 3	$ 5