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Derivatives and Hedging Activities - Schedule of Notional Value of Outstanding Foreign Currency Forward Contracts (Detail) - Foreign Exchange Forward Contracts - Non Designated - USD ($)
$ in Millions
Jul. 28, 2017
Apr. 28, 2017
Short    
Derivative [Line Items]    
Forward contracts, Notional Amount $ 102 $ 165
Long    
Derivative [Line Items]    
Forward contracts, Notional Amount $ 293 $ 257