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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. 26, 2018	Oct. 27, 2017	Oct. 26, 2018	Oct. 27, 2017
Net income per share:
Net income	$ 241	$ 174	$ 524	$ 305
Shares used in basic computation	258	269	260	270
Dilutive impact of employee equity award plans	6	6	7	7
Shares used in diluted computation	264	275	267	277
Basic	$ 0.93	$ 0.65	$ 2.02	$ 1.13
Diluted	$ 0.91	$ 0.63	$ 1.96	$ 1.10

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