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Acquisitions and Divestitures (Additional Information) (Details)
$ in Millions
6 Months Ended
Feb. 06, 2019
USD ($)
Jan. 26, 2019
USD ($)
acquisition
Jan. 27, 2018
USD ($)
Oct. 28, 2018
USD ($)
Supplementary Information [Line Items]        
Number of business combinations (acquisition) | acquisition   3    
Acquired cash and cash equivalents   $ 85    
Purchase Consideration   2,085    
Luxtera | Subsequent event        
Supplementary Information [Line Items]        
Purchase Consideration $ 660      
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   $ 11 $ 14