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Goodwill and Purchased Intangible Assets (Schedule of Purchased Intangible Assets With Finite and Indefinite Lives) (Details) - USD ($)
$ in Millions
Jan. 26, 2019
Jul. 28, 2018
Purchased intangible assets with finite lives:    
Gross $ 4,032 $ 5,312
Accumulated Amortization (1,942) (2,863)
Total purchased intangible assets with finite lives, net 2,090 2,449
In-process research and development, with indefinite lives 180 103
Total finite and indefinite lives intangible assets, Gross 4,212 5,415
Total finite and indefinite lives intangible assets, net 2,270 2,552
TECHNOLOGY    
Purchased intangible assets with finite lives:    
Gross 3,165 3,711
Accumulated Amortization (1,620) (1,888)
Total purchased intangible assets with finite lives, net 1,545 1,823
CUSTOMER RELATIONSHIPS    
Purchased intangible assets with finite lives:    
Gross 812 1,538
Accumulated Amortization (292) (937)
Total purchased intangible assets with finite lives, net 520 601
OTHER    
Purchased intangible assets with finite lives:    
Gross 55 63
Accumulated Amortization (30) (38)
Total purchased intangible assets with finite lives, net $ 25 $ 25