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
	Jul. 26, 2019	Jul. 27, 2018
Net income per share:
Net income	$ 103	$ 283
Shares used in basic computation	239	262
Dilutive impact of employee equity award plans	4	7
Shares used in diluted computation	243	269
Basic	$ 0.43	$ 1.08
Diluted	$ 0.42	$ 1.05