Derivatives and Hedging Activities - Schedule of Notional Value of Outstanding Foreign Currency Forward Contracts (Detail) - Foreign Exchange Forward Contracts - USD ($) $ in Millions	Apr. 28, 2017	Apr. 29, 2016
Cash Flow Hedging | Long
Derivative [Line Items]
Forward contracts, Notional Amount	$ 0	$ 99
Non Designated | Long
Derivative [Line Items]
Forward contracts, Notional Amount	257	396
Non Designated | Short
Derivative [Line Items]
Forward contracts, Notional Amount	$ 165	$ 160