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Segment Information and Major Customers (Summary of Net Revenue for Groups of Similar Products and Services) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 26, 2019
Jan. 27, 2018
Jan. 26, 2019
Jan. 27, 2018
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenue, total $ 12,446 $ 11,887 $ 25,518 $ 24,023
Infrastructure Platforms        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenue, total 7,128 6,710 14,770 13,690
Applications        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenue, total 1,465 1,184 2,884 2,387
Security        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenue, total 658 557 1,308 1,142
Other Products        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenue, total 22 258 200 544
Other Products | Discontinued operations, held-for-sale | Service Provider Video        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenue, total 0 230 168 478
Total Product        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenue, total 9,273 8,709 19,163 17,763
Service        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenue, total $ 3,173 $ 3,178 $ 6,355 $ 6,260