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Stockholders' Equity - Reconciliation of Retained Earnings (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 28, 2016	Oct. 30, 2015	Oct. 28, 2016	Oct. 30, 2015
Retained Earnings Adjustments [Line Items]
Beginning balance			$ 0
Cumulative-effect of new accounting principle			21
Net income	$ 109	$ 114	173	$ 84
Repurchases of common stock			(292)
Ending balance	$ 0		0
Retained Earnings
Retained Earnings Adjustments [Line Items]
Repurchases of common stock			(165)
Dividends			$ (29)