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Employee Benefit Plans (Summary Of Share-Based Compensation Expense) (Details) (USD $) In Millions	12 Months Ended
	Jul. 30, 2011	Jul. 31, 2010	Jul. 25, 2009
Allocated share-based compensation expense	$ 1,620	$ 1,517	$ 1,231
Cost Of Sales-Product [Member]
Allocated share-based compensation expense	61	57	46
Cost Of Sales-Service [Member]
Allocated share-based compensation expense	177	164	128
Share-Based Compensation Expense In Cost Of Sales [Member]
Allocated share-based compensation expense	238	221	174
Research And Development [Member]
Allocated share-based compensation expense	481	450	382
Sales And Marketing [Member]
Allocated share-based compensation expense	651	602	482
General And Administrative [Member]
Allocated share-based compensation expense	250	244	193
Share-Based Compensation Expense In Operating Expenses [Member]
Allocated share-based compensation expense	$ 1,382	$ 1,296	$ 1,057

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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