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Net Income (Loss) per Share - Computation of Basic and Diluted Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jan. 25, 2019	Jan. 26, 2018	Jan. 25, 2019	Jan. 26, 2018
Net income (loss) per share:
Net income (loss)	$ 249	$ (479)	$ 773	$ (174)
Shares used in basic computation	250	268	257	269
Dilutive impact of employee equity award plans	5	0	6	0
Shares used in diluted computation	255	268	263	269
Basic	$ 1.00	$ (1.79)	$ 3.01	$ (0.65)
Diluted	$ 0.98	$ (1.79)	$ 2.94	$ (0.65)

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