Commitments and Contingencies (Schedule Of Product Warranty Liability) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 27, 2013	Jul. 28, 2012	Jul. 30, 2011
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Balance at beginning of fiscal year	$ 415	$ 342	$ 360
Provision for warranties issued	664	661	456
Payments	(648)	(588)	(474)
Balance at end of fiscal year	$ 431	$ 415	$ 342