Goodwill and Purchased Intangible Assets (Schedule Of Purchased Intangible Assets With Finite And Indefinite Lives) (Details) - USD ($) $ in Millions	Oct. 28, 2017	Jul. 29, 2017
Business Acquisition [Line Items]
Gross	$ 4,938	$ 4,617
Accumulated Amortization	(2,376)	(2,189)
Total purchased intangible assets with finite lives, net	2,562	2,428
In-process research and development, with indefinite lives	115	111
Total finite and indefinite lives intangible assets, Gross	5,053	4,728
Total finite and indefinite lives intangible assets, net	2,677	2,539
TECHNOLOGY
Business Acquisition [Line Items]
Gross	3,465	3,182
Accumulated Amortization	(1,514)	(1,386)
Total purchased intangible assets with finite lives, net	1,951	1,796
CUSTOMER RELATIONSHIPS
Business Acquisition [Line Items]
Gross	1,391	1,353
Accumulated Amortization	(818)	(765)
Total purchased intangible assets with finite lives, net	573	588
OTHER
Business Acquisition [Line Items]
Gross	82	82
Accumulated Amortization	(44)	(38)
Total purchased intangible assets with finite lives, net	$ 38	$ 44