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Segment Information And Major Customers (Summary Of Property And Equipment Information For Geographic Areas) (Details) (USD $) In Millions, unless otherwise specified	Apr. 28, 2012	Jul. 30, 2011
Segment Reporting Information [Line Items]
Property and equipment, net	$ 3,634	$ 3,916
United States [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	3,060	3,284
International [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	$ 574	$ 632

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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