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Stock-based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
3 Months Ended 0 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Oct. 28, 2012
Oct. 30, 2011
Oct. 28, 2012
EPS Performance Restricted Stock Units [Member]
Oct. 28, 2012
Strategic Performance Restricted Stock Units [Member]
Jul. 01, 2011
Special Retention Time-Lapse Restricted Stock Units [Member]
Oct. 28, 2012
Time Lapse, EPS And Strategic Performance Restricted Stock Units [Member]
Oct. 30, 2011
Time Lapse, EPS And Strategic Performance Restricted Stock Units [Member]
Jul. 29, 2012
Time Lapse, EPS And Strategic Performance Restricted Stock Units [Member]
Oct. 28, 2012
TSR Performance Restricted Stock/Units [Member]
Jul. 29, 2012
TSR Performance Restricted Stock/Units [Member]
Oct. 28, 2012
Minimum [Member]
EPS Performance Restricted Stock Units [Member]
Oct. 28, 2012
Minimum [Member]
Strategic Performance Restricted Stock Units [Member]
Oct. 28, 2012
Maximum [Member]
EPS Performance Restricted Stock Units [Member]
Oct. 28, 2012
Maximum [Member]
Strategic Performance Restricted Stock Units [Member]
Stock-based Compensation                            
Pre-tax stock-based compensation expense $ 25 $ 22                        
Tax-related benefits 9 8                        
Cash received from the exercise of stock options 20 16                        
Total intrinsic value of options exercised 7 2                        
Nonvested, Units     269 1,800   4,620   3,951 1,512 2,143        
Nonvested, Weighted-Average Grant-Date Fair Value     $ 34.29 $ 33.22   $ 33.89   $ 33.19 $ 41.86 $ 37.94        
Potential Percentage Of Grant Under Performance Plan                     0.00% 0.00% 100.00% 200.00%
Granted, Units         400 1,832     582          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         2 years                  
Granted, Weighted-Average Grant-Date Fair Value         $ 34.65 $ 35.03 $ 32.38   $ 39.76          
Remaining unearned compensation on nonvested awards           97     32          
Weighted-average remaining service period, years           1 year 8 months     2 years 2 months          
Fair value of restricted units and shares vested           $ 38 $ 35              
Percentage recipients received based on performance                 0.00%