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Stock-based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 9 Months Ended 21 Months Ended
Oct. 27, 2019
Oct. 28, 2018
Apr. 26, 2020
Apr. 28, 2019
Apr. 26, 2020
Jul. 28, 2019
Stock-based Compensation            
Excess Tax Benefit/(Deficiency) from Share-based Compensation, Operating Activities     $ 1 $ (2)    
Cash received from the exercise of stock options     23 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value     $ 2 $ 0    
EPS Performance Restricted Stock Units [Member]            
Stock-based Compensation            
Nonvested, Units     23   23  
Nonvested, Weighted-Average Grant-Date Fair Value     $ 46.82   $ 46.82  
FCF Performance Restricted Stock Units [Member]            
Stock-based Compensation            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years      
Nonvested, Units     168   168  
Nonvested, Weighted-Average Grant-Date Fair Value     $ 42.16   $ 42.16  
Share Based Compensation Arrangements By Share Based Payment Award Equity Instruments Other than Options Issued in Period 388          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         258  
Share-based Payment Arrangement, Option [Member]            
Stock-based Compensation            
Remaining unearned compensation on nonvested awards     $ 1   $ 1  
Weighted-average remaining service period, years     1 year 7 months 6 days      
Time Lapse, EPS Performance, FCF Performance And Strategic Performance Restricted Stock Units [Member]            
Stock-based Compensation            
Remaining unearned compensation on nonvested awards     $ 42   $ 42  
Weighted-average remaining service period, years     1 year 9 months 18 days      
Nonvested, Units     2,016   2,016 1,960
Nonvested, Weighted-Average Grant-Date Fair Value     $ 42.95   $ 42.95 $ 40.57
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     1,141      
Granted, Weighted-Average Grant-Date Fair Value     $ 46.77 $ 36.50    
Fair value of restricted units and shares vested     $ 34 $ 26    
TSR Performance Restricted Stock/Units [Member]            
Stock-based Compensation            
Remaining unearned compensation on nonvested awards     $ 27   $ 27  
Weighted-average remaining service period, years     2 years      
Nonvested, Units     1,270   1,270 1,308
Nonvested, Weighted-Average Grant-Date Fair Value     $ 47.90   $ 47.90 $ 37.33
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 0.00% 0.00%        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     619      
Granted, Weighted-Average Grant-Date Fair Value     $ 63.06 $ 31.29    
Minimum [Member] | EPS Performance Restricted Stock Units [Member]            
Stock-based Compensation            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     0.00%      
Minimum [Member] | FCF Performance Restricted Stock Units [Member]            
Stock-based Compensation            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     0.00%      
Maximum [Member] | EPS Performance Restricted Stock Units [Member]            
Stock-based Compensation            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     100.00%      
Maximum [Member] | FCF Performance Restricted Stock Units [Member]            
Stock-based Compensation            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     200.00%