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Segment Information And Major Customers (Property And Equipment, Net) (Detail) (USD $) In Millions, unless otherwise specified	Jan. 26, 2013	Jul. 28, 2012
Segment Reporting Information [Line Items]
Property and equipment, net	$ 3,403	$ 3,402
International [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	595	560
United States [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	$ 2,808	$ 2,842

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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