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Stock-based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Apr. 28, 2013
Apr. 29, 2012
Apr. 28, 2013
Apr. 29, 2012
Apr. 28, 2013
EPS Performance Restricted Stock Units [Member]
Apr. 28, 2013
Strategic Performance Restricted Stock Units [Member]
Jul. 01, 2011
Special Retention Time-Lapse Restricted Stock Units [Member]
Apr. 28, 2013
Time Lapse, EPS Performance And Strategic Performance Restricted Stock Units [Member]
Apr. 29, 2012
Time Lapse, EPS Performance And Strategic Performance Restricted Stock Units [Member]
Jul. 29, 2012
Time Lapse, EPS Performance And Strategic Performance Restricted Stock Units [Member]
Apr. 28, 2013
TSR Performance Restricted Stock/Units [Member]
Jul. 29, 2012
TSR Performance Restricted Stock/Units [Member]
Apr. 28, 2013
Minimum [Member]
EPS Performance Restricted Stock Units [Member]
Apr. 28, 2013
Minimum [Member]
Strategic Performance Restricted Stock Units [Member]
Apr. 28, 2013
Maximum [Member]
EPS Performance Restricted Stock Units [Member]
Apr. 28, 2013
Maximum [Member]
Strategic Performance Restricted Stock Units [Member]
Stock-based Compensation                                
Pre-tax stock-based compensation expense $ 31 $ 17 $ 82 $ 62                        
Tax-related benefits 12 6 31 23                        
Cash received from the exercise of stock options     78 94                        
Total intrinsic value of options exercised     32 24                        
Nonvested, Units         269 1,800   4,579   3,951 1,478 2,143        
Nonvested, Weighted-Average Grant-Date Fair Value         $ 34.29 $ 33.22   $ 33.95   $ 33.19 $ 41.86 $ 37.94        
Potential Percentage Of Grant Under Performance Plan                         0.00% 0.00% 100.00% 200.00%
Granted, Units             400 1,927     582          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period             2 years                  
Granted, Weighted-Average Grant-Date Fair Value             $ 34.65 $ 35.13 $ 32.38   $ 39.76          
Remaining unearned compensation on nonvested awards               63     22          
Weighted-average remaining service period, years               1 year 6 months     1 year 11 months          
Fair value of restricted units and shares vested               39 37              
Percentage recipients received based on performance                     0.00%          
Excess tax benefits on stock-based compensation     $ 9 $ 6