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Goodwill and Purchased Intangible Assets (Schedule of Amortization of Purchased Intangible Assets) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 28, 2018
Apr. 29, 2017
Apr. 28, 2018
Apr. 29, 2017
Acquired Finite-Lived Intangible Assets [Line Items]        
Amortization of purchased intangible assets $ 67 $ 59 $ 188 $ 201
Cost of sales        
Acquired Finite-Lived Intangible Assets [Line Items]        
Amortization of purchased intangible assets 177 141 491 394
Amortization of purchased intangible assets        
Acquired Finite-Lived Intangible Assets [Line Items]        
Amortization of purchased intangible assets 67 59 188 201
Restructuring and other charges        
Acquired Finite-Lived Intangible Assets [Line Items]        
Amortization of purchased intangible assets 0 0 0 38
Total        
Acquired Finite-Lived Intangible Assets [Line Items]        
Amortization of purchased intangible assets $ 244 $ 200 $ 679 $ 633