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Commitments And Contingencies (Schedule Of Product Warranty Liability) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Apr. 27, 2013	Apr. 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	494	474
Payments	(478)	(426)
Balance at end of fiscal year	$ 431	$ 390

- 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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