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Employee Benefit Plans (Summary Of Stock Option Activity) (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jan. 26, 2013
Jan. 26, 2013
Jul. 28, 2012
Jan. 26, 2013
Jul. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period   26 66    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Beginning balance, Number Outstanding   520 621 419  
Granted and assumed, Number Outstanding 7   1    
Exercised, weighted-average exercise price per share   $ 15.25 $ 13.51    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period   82 36    
Canceled/forfeited/expired, weighted-average exercise price per share   $ 21.32 $ 23.40    
Weighted-average exercise price per share, ending balance $ 23.08 $ 23.08 $ 22.68   $ 21.79
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 0.92   $ 2.08