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Stockholders' Equity - Reconciliation of Retained Earnings (Accumulated Deficit) (Detail) - USD ($) $ in Millions	3 Months Ended		183 Months Ended
	Jul. 27, 2018	Jul. 28, 2017	Jul. 27, 2018
Retained Earnings Adjustments [Line Items]
Beginning balance	$ (9)
Net income	283	$ 131
Repurchases of common stock	(500)		$ (10,100)
Ending balance	0		0
Retained Earnings (Accumulated Deficit)
Retained Earnings Adjustments [Line Items]
Cumulative-effect of new accounting principle	(51)		$ (51)
Net income	283
Repurchases of common stock	$ (223)

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