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Stock-based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 12 Months Ended
Oct. 30, 2016
Nov. 01, 2015
Oct. 27, 2013
Jul. 31, 2016
Aug. 02, 2015
Aug. 03, 2014
Stock-based Compensation            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       3 years    
Pre-tax stock-based compensation expense       $ 64 $ 57 $ 56
Tax-related benefits       24 21 21
Total intrinsic value of options exercised       2 5 12
Excess tax benefits on stock-based compensation       7 6 13
Cash received from the exercise of stock options       $ 2 $ 9 $ 18
EPS Performance Restricted Stock Units [Member]            
Stock-based Compensation            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       3 years    
Nonvested, Units       208    
Nonvested, Weighted-Average Grant-Date Fair Value       $ 45.30    
Strategic Performance Restricted Stock Units [Member]            
Stock-based Compensation            
Nonvested, Units       336    
Nonvested, Weighted-Average Grant-Date Fair Value       $ 41.21    
Employee Stock Option [Member]            
Stock-based Compensation            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       3 years    
Share Based Compensation Arrangement Share Based Payment Award Vested Options Contractual Exercise Term       10 years    
Remaining unearned compensation on nonvested awards       $ 2    
Weighted-average remaining service period, years       1 year 9 months    
Special Performance Restricted Stock Units [Member]            
Stock-based Compensation            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       2 years    
Nonvested, Units       92    
Nonvested, Weighted-Average Grant-Date Fair Value       $ 42.22    
Time Lapse E P S And Strategic Performance Restricted Stock Units [Member]            
Stock-based Compensation            
Remaining unearned compensation on nonvested awards       $ 25    
Weighted-average remaining service period, years       1 year 7 months    
Nonvested, Units       2,004 2,410  
Nonvested, Weighted-Average Grant-Date Fair Value       $ 45.08 $ 41.40  
Granted, Weighted-Average Grant-Date Fair Value       $ 50.44 $ 43.00 $ 39.97
Fair value of restricted units and shares vested       $ 44 $ 56 $ 106
TSR Performance Restricted Stock/Units [Member]            
Stock-based Compensation            
Remaining unearned compensation on nonvested awards       $ 34    
Weighted-average remaining service period, years       1 year 9 months    
Nonvested, Units       1,641 1,579  
Nonvested, Weighted-Average Grant-Date Fair Value       $ 49.13 $ 40.75  
Granted, Weighted-Average Grant-Date Fair Value       $ 62.44 $ 43.39 $ 36.26
Fair value of restricted units and shares vested       $ 22    
Percentage recipients received based on performance   100.00% 0.00%      
Discontinued Operations [Member]            
Stock-based Compensation            
Pre-tax stock-based compensation expense           $ 1
Minimum [Member] | EPS Performance Restricted Stock Units [Member]            
Stock-based Compensation            
Potential Percentage Of Grant Under Performance Plan       0.00%    
Minimum [Member] | Strategic Performance Restricted Stock Units [Member]            
Stock-based Compensation            
Potential Percentage Of Grant Under Performance Plan       0.00%    
Minimum [Member] | TSR Performance Restricted Stock/Units [Member]            
Stock-based Compensation            
Potential Percentage Of Grant Under Performance Plan       0.00%    
Maximum [Member] | EPS Performance Restricted Stock Units [Member]            
Stock-based Compensation            
Potential Percentage Of Grant Under Performance Plan       100.00%    
Maximum [Member] | Strategic Performance Restricted Stock Units [Member]            
Stock-based Compensation            
Potential Percentage Of Grant Under Performance Plan       200.00%    
Maximum [Member] | TSR Performance Restricted Stock/Units [Member]            
Stock-based Compensation            
Potential Percentage Of Grant Under Performance Plan       200.00%    
2003 And Previous Long-Term Incentive Plan [Member]            
Stock-based Compensation            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       31,200    
2005 Long Term Incentive Plan [Member]            
Stock-based Compensation            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       6,000    
2005 Long Term Incentive Plan, Total Shares Authorized, as Amended In 2008 [Member]            
Stock-based Compensation            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       10,500    
2005 Long Term Incentive Plan, Total Shares Authorized, as Amended in 2010 [Member]            
Stock-based Compensation            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       17,500    
2015 Long-Term Incentive Plan [Member]            
Stock-based Compensation            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       13,000    
2005 Long-Term Incentive Plan Rolled into the 2015 Long-Term Incentive Plan            
Stock-based Compensation            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       6,000    
Scenario, Forecast [Member] | Strategic Performance Restricted Stock Units [Member]            
Stock-based Compensation            
Percentage recipients received based on performance 35.00%          
Scenario, Forecast [Member] | TSR Performance Restricted Stock/Units [Member]            
Stock-based Compensation            
Percentage recipients received based on performance 75.00%          
Scenario, Forecast [Member] | Financial [Member] | Special Performance Restricted Stock Units [Member]            
Stock-based Compensation            
Percentage recipients received based on performance 0.00%          
Scenario, Forecast [Member] | Milestones [Member] | Special Performance Restricted Stock Units [Member]            
Stock-based Compensation            
Percentage recipients received based on performance 100.00%