Employee Benefit Plans (Summary Assumptions Related To And Valuation Of Employee Share-Based Awards (Time-Based RSU and PRSU)) (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jan. 28, 2017	Jan. 23, 2016	Jan. 28, 2017	Jan. 23, 2016
RESTRICTED STOCK UNITS
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)	15,000,000	27,000,000	23,000,000	36,000,000
Grant date fair value per share (in dollars per share)	$ 27.68	$ 25.25	$ 27.96	$ 24.93
Expected dividend yield	3.40%	3.10%	3.40%	3.10%
Range of risk-free interest rates, minimum	0.00%	0.10%	0.00%	0.00%
Range of risk-free interest rates, maximum	1.50%	1.20%	1.50%	1.20%
PERFORMANCE RESTRICTED STOCK UNITS
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)	3,000,000	1,000,000	6,000,000	5,000,000
Grant date fair value per share (in dollars per share)	$ 27.90	$ 25.32	$ 28.78	$ 24.71
Expected dividend yield	3.40%	3.10%	3.40%	3.20%
Range of risk-free interest rates, minimum	0.30%	0.00%	0.10%	0.00%
Range of risk-free interest rates, maximum	1.50%	1.20%	1.50%	1.20%
Range of expected volatilities for index, minimum		15.30%	16.70%	15.30%
Range of expected volatilities for index, maximum		54.30%	46.80%	54.30%