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Employee Benefit Plans (Summary Of Significant Ranges Of Outstanding And Exercisable Stock Options) (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Apr. 28, 2018
Jul. 29, 2017
Jul. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number Outstanding (in shares) 8,000,000 12,000,000 73,000,000
Weighted- Average Exercise Price per Share (in dollars per share) $ 7.02 $ 6.15 $ 26.78
Number Exercisable (in shares)   6,000,000  
Weighted- Average Exercise Price per Share (in dollars per share)   $ 5.61  
$ 0.01 – 35.00      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number Outstanding (in shares) 8,000,000    
Weighted- Average Remaining Contractual Life (in Years) 6 years 2 months 12 days    
Weighted- Average Exercise Price per Share (in dollars per share) $ 7.02    
Aggregate Intrinsic Value (Outstanding Options) $ 300    
Number Exercisable (in shares) 5,000,000    
Weighted- Average Exercise Price per Share (in dollars per share) $ 6.61    
Aggregate Intrinsic Value (Exercisable Options) $ 174    
Minimum | $ 0.01 – 35.00      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted- Average Exercise Price per Share (in dollars per share) $ 0.01    
Weighted- Average Exercise Price per Share (in dollars per share) 0.01    
Maximum | $ 0.01 – 35.00      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted- Average Exercise Price per Share (in dollars per share) 35.00    
Weighted- Average Exercise Price per Share (in dollars per share) $ 35.00