Goodwill And Purchased Intangible Assets (Schedule Of Purchased Intangible Assets With Finite And Indefinite Lives) (Detail) (USD $) In Millions, unless otherwise specified	Jan. 25, 2014	Jul. 27, 2013
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross	$ 5,857	$ 5,159
Accumulated Amortization	(2,308)	(1,842)
Finite-Lived Intangible Assets, Net	3,549	3,317
Indefinite-Lived Intangible Assets (Excluding Goodwill)	144	86
Gross Purchased Intangibles	6,001	5,245
Total Purchased intangible assets, net	3,693	3,403
Technology [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross	4,103	3,563
Accumulated Amortization	(1,709)	(1,366)
Finite-Lived Intangible Assets, Net	2,394	2,197
Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross	1,698	1,566
Accumulated Amortization	(586)	(466)
Finite-Lived Intangible Assets, Net	1,112	1,100
Finite Lived Intangible Other [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross	56	30
Accumulated Amortization	(13)	(10)
Finite-Lived Intangible Assets, Net	$ 43	$ 20