Goodwill And Purchased Intangible Assets (Schedule Of Purchased Intangible Assets With Finite And Indefinite Lives) (Detail) (USD $) In Millions, unless otherwise specified	Oct. 27, 2012	Jul. 28, 2012
Business Acquisition [Line Items]
Intangible Assets Gross Excluding Goodwill	$ 6,299
Finite-Lived Intangible Assets, Accumulated Amortization	(2,850)
Intangible Assets, Net (Excluding Goodwill)	3,449	1,959
Technology [Member]
Business Acquisition [Line Items]
Intangible Assets Gross Excluding Goodwill	3,053	2,267
Finite-Lived Intangible Assets, Accumulated Amortization	(1,027)	(908)
Intangible Assets, Net (Excluding Goodwill)	2,026	1,359
Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible Assets Gross Excluding Goodwill	3,079	2,261
Finite-Lived Intangible Assets, Accumulated Amortization	(1,780)	(1,669)
Intangible Assets, Net (Excluding Goodwill)	1,299	592
Finite Lived Intangible Other [Member]
Business Acquisition [Line Items]
Intangible Assets Gross Excluding Goodwill	73	49
Finite-Lived Intangible Assets, Accumulated Amortization	(43)	(41)
Intangible Assets, Net (Excluding Goodwill)	30	8
Total Purchased Intangible Assets With Finite Lives [Member]
Business Acquisition [Line Items]
Intangible Assets Gross Excluding Goodwill	6,205	4,577
Finite-Lived Intangible Assets, Accumulated Amortization	(2,850)	(2,618)
Intangible Assets, Net (Excluding Goodwill)	3,355	1,959
In Process Research And Development With Indefinite Lives [Member]
Business Acquisition [Line Items]
Gross In Process Research Development With Indefinite Lives	94
Net In Process Research Development With Indefinite Lives	$ 94