Employee Benefit Plans (Summary Assumptions Related To And Valuation Of Employee Share-Based Awards (Time-Based Restricted Stock Units)) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Jul. 27, 2013	Jul. 28, 2012	Jul. 30, 2011
RESTRICTED STOCK UNITS
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in millions)	64	62	54
Grant date fair value per share	$ 18.39	$ 17.26	$ 20.59
Expected dividend	3.00%	1.50%	0.30%
Range of Risk Free Interest Rate, Minimum	0.00%	0.00%	0.00%
Range of Risk Free Interest Rate, Maximum	1.10%	1.10%	1.90%
Performance Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in millions)	4	2
Grant date fair value per share	$ 19.73	$ 22.17
Expected dividend	2.90%	1.30%
Range of Risk Free Interest Rate, Minimum	0.10%	0.00%
Range of Risk Free Interest Rate, Maximum	0.70%	0.90%
Range of Expected Volatility Rate, Minimum	18.30%	19.80%
Range of Expected Volatility Rate, Maximum	78.30%	60.80%