Employee Benefit Plans (Summary Of Share-Based Compensation Expense) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 27, 2013	Jul. 28, 2012	Jul. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	$ 1,120	$ 1,401	$ 1,620
Income tax benefit for employee share-based compensation expense	285	335	444
Cost Of Sales-Product
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	40	53	61
Cost Of Sales-Service
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	138	156	177
Cost Of Sales
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	178	209	238
Research and Development Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	286	401	481
Selling and Marketing Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	484	588	651
General and Administrative Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	175	203	250
Restructuring Charges [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	(3)	0	0
Operating Expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	$ 942	$ 1,192	$ 1,382