Goodwill And Purchased Intangible Assets (Schedule Of Amortization Of Purchased Intangible Assets) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 26, 2014	Apr. 27, 2013	Apr. 26, 2014	Apr. 27, 2013
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of Purchased Intangible Assets	$ 71	$ 89	$ 207	$ 329
Cost of Sales
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of Purchased Intangible Assets	190	156	553	444
Operating Expenses
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of Purchased Intangible Assets	71	89	207	329
Cost of Sales and Operating Expenses [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of Purchased Intangible Assets	$ 261	$ 245	$ 760	$ 773