Goodwill and Purchased Intangible Assets (Schedule of Purchased Intangible Assets With Finite and Indefinite Lives) (Details) - USD ($) $ in Millions	Jan. 27, 2018	Jul. 29, 2017
Purchased intangible assets with finite lives:
Gross	$ 4,934	$ 4,617
Accumulated Amortization	(2,577)	(2,189)
Total purchased intangible assets with finite lives, net	2,357	2,428
In-process research and development, with indefinite lives	117	111
Total finite and indefinite lives intangible assets, Gross	5,051	4,728
Total finite and indefinite lives intangible assets, net	2,474	2,539
TECHNOLOGY
Purchased intangible assets with finite lives:
Gross	3,465	3,182
Accumulated Amortization	(1,659)	(1,386)
Total purchased intangible assets with finite lives, net	1,806	1,796
CUSTOMER RELATIONSHIPS
Purchased intangible assets with finite lives:
Gross	1,387	1,353
Accumulated Amortization	(867)	(765)
Total purchased intangible assets with finite lives, net	520	588
OTHER
Purchased intangible assets with finite lives:
Gross	82	82
Accumulated Amortization	(51)	(38)
Total purchased intangible assets with finite lives, net	$ 31	$ 44