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Acquisitions and Divestitures (Additional Information) (Details)
$ in Millions
3 Months Ended 12 Months Ended
Oct. 27, 2018
USD ($)
Jul. 28, 2018
USD ($)
acquisition
divestiture
Jul. 29, 2017
USD ($)
Jul. 30, 2016
USD ($)
acquisition
Divestiture [Line Items]        
Number of business combinations (acquisition) | acquisition   8   12
Cash and cash equivalents acquired   $ 187 $ 138  
Total purchase consideration   3,218 3,637 $ 3,400
Cash payments for acquisition   3,006 3,324 3,161
General and Administrative Expense        
Divestiture [Line Items]        
Total transaction costs   41 $ 10 $ 32
Forecast | Duo Security        
Divestiture [Line Items]        
Cash payments for acquisition $ 2,350      
Discontinued Operations, Held-for-sale | Service Provider Video        
Divestiture [Line Items]        
Disposal group, tangible assets   175    
Disposal group, goodwill and intangible assets   300    
Disposal group, liabilities   $ 320    
Disposal Group, Disposed of by Sale, Not Discontinued Operations        
Divestiture [Line Items]        
Number of divestitures (divestiture) | divestiture   2