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Stock-based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 12 Months Ended
Nov. 01, 2015
Nov. 02, 2014
Aug. 02, 2015
Stock-based Compensation      
Pre-tax stock-based compensation expense $ 13 $ 13  
Tax-related benefits 5 5  
Cash received from the exercise of stock options 1 6  
Total intrinsic value of options exercised   4  
Excess tax benefits on stock-based compensation 6 5  
Employee Stock Option [Member]      
Stock-based Compensation      
Remaining unearned compensation on nonvested awards $ 4    
Weighted-average remaining service period, years 1 year 8 months    
EPS Performance Restricted Stock Units [Member]      
Stock-based Compensation      
Nonvested, Units 211    
Nonvested, Weighted-Average Grant-Date Fair Value $ 45.32    
Strategic Performance Restricted Stock Units [Member]      
Stock-based Compensation      
Nonvested, Units 346    
Nonvested, Weighted-Average Grant-Date Fair Value $ 41.21    
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 126    
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 $ 52    
Weighted-average remaining service period, years 1 year 11 months    
Nonvested, Units 2,160   2,410
Nonvested, Weighted-Average Grant-Date Fair Value $ 44.72   $ 41.40
Fair value of restricted units and shares vested $ 40 $ 52  
Granted, Weighted-Average Grant-Date Fair Value $ 49.94 $ 42.24  
TSR Performance Restricted Stock/Units [Member]      
Stock-based Compensation      
Remaining unearned compensation on nonvested awards $ 54    
Weighted-average remaining service period, years 2 years 6 months    
Nonvested, Units 1,753   1,579
Nonvested, Weighted-Average Grant-Date Fair Value $ 49.31   $ 40.75
Fair value of restricted units and shares vested $ 22 $ 0  
Granted, Weighted-Average Grant-Date Fair Value $ 62.44   $ 43.39
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] | Special 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] | Special Performance Restricted Stock Units [Member]      
Stock-based Compensation      
Potential Percentage Of Grant Under Performance Plan 150.00%