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