Employee Benefit Plans (Summary Assumptions Related To And Valuation Of Employee Share-Based Awards (Time-Based Restricted Stock Units)) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 24, 2015	Jan. 25, 2014	Jan. 24, 2015	Jan. 25, 2014
RESTRICTED STOCK UNITS
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in millions)	1	37	11	47
Grant date fair value per share	$ 25.07	$ 19.90	$ 23.34	$ 20.57
Expected dividend	2.80%	3.20%	3.00%	3.10%
Range of Risk Free Interest Rate, Minimum	0.00%	0.10%	0.00%	0.00%
Range of Risk Free Interest Rate, Maximum	1.60%	1.40%	1.80%	1.40%
PERFORMANCE RESTRICTED STOCK UNITS
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in millions)	1	0	7	4
Grant date fair value per share	$ 25.39		$ 23.70	$ 22.70
Expected dividend	2.80%		3.00%	2.30%
Range of Risk Free Interest Rate, Minimum	0.00%		0.00%	0.00%
Range of Risk Free Interest Rate, Maximum	1.60%		1.80%	1.40%
Range of Expected Volatility Rate, Minimum	14.40%		14.40%	17.40%
Range of Expected Volatility Rate, Maximum	63.70%		70.00%	70.50%