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Goodwill and Purchased Intangible Assets (Schedule of Purchased Intangible Assets With Finite and Indefinite Lives) (Details) - USD ($)
$ in Millions
Apr. 28, 2018
Jul. 29, 2017
Purchased intangible assets with finite lives:    
Gross $ 5,258 $ 4,617
Accumulated Amortization (2,681) (2,189)
Total purchased intangible assets with finite lives, net 2,577 2,428
In-process research and development, with indefinite lives 104 111
Total finite and indefinite lives intangible assets, Gross 5,362 4,728
Total finite and indefinite lives intangible assets, net 2,681 2,539
TECHNOLOGY    
Purchased intangible assets with finite lives:    
Gross 3,657 3,182
Accumulated Amortization (1,738) (1,386)
Total purchased intangible assets with finite lives, net 1,919 1,796
CUSTOMER RELATIONSHIPS    
Purchased intangible assets with finite lives:    
Gross 1,538 1,353
Accumulated Amortization (909) (765)
Total purchased intangible assets with finite lives, net 629 588
OTHER    
Purchased intangible assets with finite lives:    
Gross 63 82
Accumulated Amortization (34) (38)
Total purchased intangible assets with finite lives, net $ 29 $ 44