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Stockholders' Equity - Reconciliation of Retained Earnings (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 27, 2017	Oct. 28, 2016	Oct. 27, 2017	Oct. 28, 2016
Retained Earnings Adjustments [Line Items]
Beginning balance			$ 40
Net income	$ 175	$ 109	311	$ 173
Repurchases of common stock			(300)
Ending balance	$ 17		17
Retained Earnings
Retained Earnings Adjustments [Line Items]
Repurchases of common stock			(226)
Dividends			$ (108)