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Stockholders' Equity - Reconciliation of Retained Earnings (Accumulated Deficit) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		185 Months Ended
	Oct. 26, 2018	Oct. 27, 2017	Oct. 26, 2018	Oct. 27, 2017	Oct. 26, 2018
Retained Earnings Adjustments [Line Items]
Beginning balance			$ (9)
Net income	$ 241	$ 174	524	$ 305
Repurchases of common stock			(1,061)		$ (10,700)
Ending balance	0		0		0
Retained Earnings (Accumulated Deficit)
Retained Earnings Adjustments [Line Items]
Cumulative-effect of new accounting principle	$ (51)		(51)		$ (51)
Net income			524
Repurchases of common stock			$ (464)

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