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Goodwill and Purchased Intangible Assets (Schedule of Purchased Intangible Assets With Finite And Indefinite Lives) (Details) - USD ($)
$ in Millions
Jul. 28, 2018
Jul. 29, 2017
Business Acquisition [Line Items]    
Gross $ 5,312 $ 4,617
Accumulated Amortization (2,863) (2,189)
Net 2,449 2,428
In-process research and development, with indefinite lives 103 111
Total 5,415 4,728
Total, Net 2,552 2,539
TECHNOLOGY    
Business Acquisition [Line Items]    
Gross 3,711 3,182
Accumulated Amortization (1,888) (1,386)
Net 1,823 1,796
CUSTOMER RELATIONSHIPS    
Business Acquisition [Line Items]    
Gross 1,538 1,353
Accumulated Amortization (937) (765)
Net 601 588
OTHER    
Business Acquisition [Line Items]    
Gross 63 82
Accumulated Amortization (38) (38)
Net $ 25 $ 44