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Acquisitions and Divestitures (Additional Information - Divestiture) (Details) - USD ($)
$ in Millions
12 Months Ended
Jul. 30, 2016
Jul. 25, 2015
Jul. 26, 2014
Divestiture [Line Items]      
Cash consideration $ 372 $ 0 $ 0
Client premises equipment portion of SPV connected devices BU [Member]      
Divestiture [Line Items]      
Divestiture, consideration received 542    
Cash consideration 372    
Equity fair value as of divestiture date 170    
Divestiture gain, net of transaction costs $ 253