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Employee Benefit Plans (Summary Of Significant Ranges Of Outstanding And Exercisable Stock Options) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Jul. 25, 2015
Jul. 26, 2014
Jul. 27, 2013
Jul. 28, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number Outstanding 103 187 276 520
Weighted- Average Remaining Contractual Life (in Years) 1 year 1 month 6 days      
Weighted- Average Exercise Price per Share $ 28.68 $ 26.03 $ 24.44 $ 22.68
Aggregate Intrinsic Value $ 222      
Number Exercisable 102 183    
Weighted- Average Exercise Price per Share $ 29.02 $ 26.50    
Aggregate Intrinsic Value $ 188      
$0.01 - 20.00        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number Outstanding 4      
Weighted- Average Remaining Contractual Life (in Years) 5 years      
Weighted- Average Exercise Price per Share $ 4.96      
Aggregate Intrinsic Value $ 97      
Number Exercisable 3      
Weighted- Average Exercise Price per Share $ 6.15      
Aggregate Intrinsic Value $ 63      
Range of exercise prices, lower range price $ 0.01      
Range of exercise prices, upper range price $ 20.00      
$ 20.01 – 25.00        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number Outstanding 19      
Weighted- Average Remaining Contractual Life (in Years) 3 months 18 days      
Weighted- Average Exercise Price per Share $ 23.03      
Aggregate Intrinsic Value $ 101      
Number Exercisable 19      
Weighted- Average Exercise Price per Share $ 23.03      
Aggregate Intrinsic Value $ 101      
Range of exercise prices, lower range price $ 20.01      
Range of exercise prices, upper range price $ 25.00      
$ 25.01 – 30.00        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number Outstanding 14      
Weighted- Average Remaining Contractual Life (in Years) 1 year      
Weighted- Average Exercise Price per Share $ 26.83      
Aggregate Intrinsic Value $ 24      
Number Exercisable 14      
Weighted- Average Exercise Price per Share $ 26.82      
Aggregate Intrinsic Value $ 24      
Range of exercise prices, lower range price $ 25.01      
Range of exercise prices, upper range price $ 30.00      
$30.01 - 35.0        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number Outstanding 66      
Weighted- Average Remaining Contractual Life (in Years) 1 year 1 month 6 days      
Weighted- Average Exercise Price per Share $ 32.16      
Aggregate Intrinsic Value $ 0      
Number Exercisable 66      
Weighted- Average Exercise Price per Share $ 32.16      
Aggregate Intrinsic Value $ 0      
Range of exercise prices, lower range price $ 30.01      
Range of exercise prices, upper range price $ 35.00