Net Income per Share - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Oct. 30, 2015	Oct. 24, 2014	Oct. 30, 2015	Oct. 24, 2014
Net income per share:
Net income	$ 114	$ 160	$ 84	$ 248
Shares used in basic computation	294	318	299	321
Dilutive impact of employee equity award plans	2	5	3	5
Shares used in diluted computation	296	323	302	326
Basic	$ 0.39	$ 0.50	$ 0.28	$ 0.77
Diluted	$ 0.39	$ 0.49	$ 0.28	$ 0.76