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Commitments And Contingencies (Schedule Of Product Warranty Liability) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jan. 26, 2013	Jan. 28, 2012
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Balance at beginning of fiscal year	$ 415	$ 342
Provision for warranties issued	319	331
Payments	(310)	(266)
Balance at end of fiscal year	$ 424	$ 407

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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