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. 26, 2018	Jan. 27, 2017	Jan. 26, 2018	Jan. 27, 2017
Net income (loss) per share:
Net income (loss)	$ (506)	$ 146	$ (195)	$ 319
Shares used in basic computation	268	274	269	277
Dilutive impact of employee equity award plans	0	7	0	5
Shares used in diluted computation	268	281	269	282
Basic	$ (1.89)	$ 0.53	$ (0.72)	$ 1.15
Diluted	$ (1.89)	$ 0.52	$ (0.72)	$ 1.13