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. 27, 2017	Oct. 28, 2016	Oct. 27, 2017	Oct. 28, 2016
Net income per share:
Net income	$ 175	$ 109	$ 311	$ 173
Shares used in basic computation	269	278	270	278
Dilutive impact of employee equity award plans	6	6	7	5
Shares used in diluted computation	275	284	277	283
Basic	$ 0.65	$ 0.39	$ 1.15	$ 0.62
Diluted	$ 0.64	$ 0.38	$ 1.12	$ 0.61