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Stock-based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 9 Months Ended
Apr. 28, 2019
Oct. 28, 2018
Apr. 29, 2018
Oct. 29, 2017
Apr. 28, 2019
Apr. 29, 2018
Jul. 29, 2018
Stock-based Compensation              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period         0 0  
Excess Tax Benefit/(Deficiency) from Share-based Compensation, Operating Activities         $ (2) $ 4  
Allocated Share-based Compensation Expense $ 13   $ 16   43 46  
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 2   3   8 $ 10  
Employee Stock Option [Member]              
Stock-based Compensation              
Remaining unearned compensation on nonvested awards $ 2       $ 2    
Weighted-average remaining service period, years         2 years 6 months    
EPS Performance Restricted Stock Units [Member]              
Stock-based Compensation              
Nonvested, Units 66       66    
Nonvested, Weighted-Average Grant-Date Fair Value $ 49.10       $ 49.10    
EPS Performance Restricted Stock Units [Member] | Minimum [Member]              
Stock-based Compensation              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         0.00%    
EPS Performance Restricted Stock Units [Member] | Maximum [Member]              
Stock-based Compensation              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         100.00%    
FCF Performance Restricted Stock Units [Member]              
Stock-based Compensation              
Nonvested, Units 118       118    
Nonvested, Weighted-Average Grant-Date Fair Value $ 37.62       $ 37.62    
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         129    
FCF Performance Restricted Stock Units [Member] | Minimum [Member]              
Stock-based Compensation              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         0.00%    
FCF Performance Restricted Stock Units [Member] | Maximum [Member]              
Stock-based Compensation              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         200.00%    
Time Lapse, EPS, FCF, Strategic Performance and Special Performance Restricted Stock Units [Member]              
Stock-based Compensation              
Remaining unearned compensation on nonvested awards $ 45       $ 45    
Weighted-average remaining service period, years         1 year 11 months    
Nonvested, Units 2,040       2,040   1,652
Nonvested, Weighted-Average Grant-Date Fair Value $ 40.64       $ 40.64   $ 47.01
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         1,331    
Granted, Weighted-Average Grant-Date Fair Value         $ 36.50 $ 46.03  
Fair value of restricted units and shares vested         $ 26 $ 30  
TSR Performance Restricted Stock/Units [Member]              
Stock-based Compensation              
Remaining unearned compensation on nonvested awards $ 18       $ 18    
Weighted-average remaining service period, years         1 year 8 months    
Nonvested, Units 1,342       1,342   1,664
Nonvested, Weighted-Average Grant-Date Fair Value $ 37.30       $ 37.30   $ 46.66
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   0.00%   125.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         388    
Granted, Weighted-Average Grant-Date Fair Value         $ 31.29 $ 39.39  
Fair value of restricted units and shares vested           $ 38  
T S R Performance Restricted Stock Units Additional Shares [Member]              
Stock-based Compensation              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       160      
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]              
Stock-based Compensation              
Allocated Share-based Compensation Expense $ 1   0   $ 2 2  
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense $ 1   $ 0   $ 1 $ 0