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Stock-based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
3 Months Ended
Nov. 02, 2014
Oct. 27, 2013
Aug. 03, 2014
Stock-based Compensation      
Pre-tax stock-based compensation expense $ 13 $ 21  
Tax-related benefits 5 8  
Cash received from the exercise of stock options 6 4  
Total intrinsic value of options exercised 4 2  
Excess tax benefits on stock-based compensation 5 10  
EPS Performance Restricted Stock Units [Member]
     
Stock-based Compensation      
Nonvested, Units 252    
Nonvested, Weighted-Average Grant-Date Fair Value $ 40.72    
Strategic Performance Restricted Stock Units [Member]
     
Stock-based Compensation      
Nonvested, Units 390    
Nonvested, Weighted-Average Grant-Date Fair Value $ 41.21    
Special Performance Restricted Stock Units [Member]
     
Stock-based Compensation      
Nonvested, Weighted-Average Grant-Date Fair Value $ 42.22    
Granted, Units 184    
Award Vesting Period 2 years 0 months    
Time-Lapse, EPS Performance, Strategic Performance And Special Performance Restricted Stock Units [Member]
     
Stock-based Compensation      
Nonvested, Units 2,454   2,994
Nonvested, Weighted-Average Grant-Date Fair Value $ 40.98   $ 37.69
Granted, Units 1,024    
Remaining unearned compensation on nonvested awards 63    
Weighted-average remaining service period, years 1 year 10 months    
Fair value of restricted units and shares vested 52 103  
Granted, Weighted-Average Grant-Date Fair Value $ 42.24 $ 39.72  
TSR Performance Restricted Stock Units [Member]
     
Stock-based Compensation      
Nonvested, Units 1,719   861
Nonvested, Weighted-Average Grant-Date Fair Value $ 40.81   $ 38.15
Granted, Units 874    
Remaining unearned compensation on nonvested awards $ 44    
Weighted-average remaining service period, years 2 years 6 months    
Granted, Weighted-Average Grant-Date Fair Value $ 43.39 $ 36.26  
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%