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Acquisitions and Divestitures (Additional Information) (Details)
$ in Millions
9 Months Ended
Apr. 27, 2019
USD ($)
acquisition
Apr. 28, 2018
USD ($)
Oct. 28, 2018
USD ($)
Supplementary Information [Line Items]      
Number of business combinations (acquisition) | acquisition 5    
Acquired cash and cash equivalents $ 100    
Discontinued operations, held-for-sale | Service Provider Video      
Supplementary Information [Line Items]      
Disposal group, tangible assets     $ 160
Disposal group, goodwill and intangible assets     340
Disposal group, liabilities     $ 200
General and administrative      
Supplementary Information [Line Items]      
Acquisition related costs $ 15 $ 25