Employee Benefit Plans (Summary Assumptions Related To And Valuation Of Employee Share-Based Awards (Time-Based RSU and PRSU)) (Details) - $ / shares	3 Months Ended		9 Months Ended
	Apr. 28, 2018	Apr. 29, 2017	Apr. 28, 2018	Apr. 29, 2017
RESTRICTED STOCK UNITS
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)	2,000,000	1,000,000	30,000,000	23,000,000
Grant date fair value per share (in dollars per share)	$ 39.31	$ 30.91	$ 33.97	$ 28.05
Expected dividend yield	2.90%	3.40%	3.20%	3.40%
Range of risk-free interest rates, minimum	0.00%	0.00%	0.00%	0.00%
Range of risk-free interest rates, maximum	2.60%	1.50%	2.60%	1.50%
PERFORMANCE RESTRICTED STOCK UNITS
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)	0	0	3,000,000	7,000,000
Grant date fair value per share (in dollars per share)	$ 43.44	$ 31.65	$ 31.96	$ 28.90
Expected dividend yield	3.00%	3.40%	3.50%	3.40%
Range of risk-free interest rates, minimum	1.50%	0.80%	1.00%	0.10%
Range of risk-free interest rates, maximum	2.50%	1.50%	2.50%	1.50%
Range of expected volatilities for index, minimum	12.50%		12.50%	16.70%
Range of expected volatilities for index, maximum	82.80%		82.80%	46.80%