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Commitments And Contingencies (Schedule Of Product Warranty Liability) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Oct. 27, 2012	Oct. 29, 2011
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Balance at beginning of fiscal year	$ 415	$ 342
Provision for warranties issued	162	151
Payments	(155)	(132)
Balance at end of fiscal year	$ 422	$ 361

- 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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