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Goodwill and Purchased Intangible Assets (Schedule Of Amortization Of Purchased Intangible Assets) (Details) - USD ($)
$ in Millions
3 Months Ended
Oct. 29, 2016
Oct. 24, 2015
Acquired Finite-Lived Intangible Assets [Line Items]    
Amortization of purchased intangible assets $ 78 $ 69
Cost of sales    
Acquired Finite-Lived Intangible Assets [Line Items]    
Amortization of purchased intangible assets 129 146
Amortization of purchased intangible assets    
Acquired Finite-Lived Intangible Assets [Line Items]    
Amortization of purchased intangible assets 78 69
Restructuring and other charges    
Acquired Finite-Lived Intangible Assets [Line Items]    
Amortization of purchased intangible assets 38 0
Total    
Acquired Finite-Lived Intangible Assets [Line Items]    
Amortization of purchased intangible assets $ 245 $ 215