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Business Combinations - Fair Values of Net Assets Acquired (Detail) - USD ($)
$ in Millions
Apr. 28, 2017
Apr. 29, 2016
Apr. 24, 2015
Business Acquisition [Line Items]      
Goodwill $ 1,684 $ 1,676 $ 1,027
Fiscal 2015 Acquisitions      
Business Acquisition [Line Items]      
Net tangible assets     14
Finite-lived intangible assets     32
Goodwill     39
Total purchase price     $ 85