Goodwill And Purchased Intangible Assets (Schedule Of Purchased Intangible Assets With Finite And Indefinite Lives) (Detail) (USD $) In Millions, unless otherwise specified	Oct. 26, 2013	Jul. 27, 2013
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross	$ 5,787	$ 5,159
Accumulated Amortization	(2,056)	(1,842)
Finite-Lived Intangible Assets, Net	3,731	3,317
Gross In Process Research Development With Indefinite Lives	104	86
Gross Purchased Intangibles	5,891	5,245
Total Purchased intangible assets, net	3,835	3,403
Technology [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross	4,034	3,563
Accumulated Amortization	(1,529)	(1,366)
Finite-Lived Intangible Assets, Net	2,505	2,197
Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross	1,698	1,566
Accumulated Amortization	(516)	(466)
Finite-Lived Intangible Assets, Net	1,182	1,100
Finite Lived Intangible Other [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross	55	30
Accumulated Amortization	(11)	(10)
Finite-Lived Intangible Assets, Net	$ 44	$ 20