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Stock-based Compensation (Schedule Of Stock Option Activity) (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
9 Months Ended
Apr. 28, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Beginning of year, Options 4,254
Granted, Options 0
Exercised, Options (2,948)
Terminated, Options (7)
End of year, Options 1,299
Exercisable at end of period, Options 1,299
Beginning of period, Weighted-Average Exercise Price $ 26.73
Granted, Weighted-Average Exercise Price $ 0.00
Exercised, Weighted-Average Exercise Price $ 26.54
Terminated, Weighted-Average Exercise Price $ 26.36
End of period, Weighted-Average Exercise Price $ 27.16
Exercisable at end of period, Weighted-Average Exercise Price $ 27.16
Outstanding at end of period, Weighted-Average Remaining Contractual Life (In years) 1 year 5 months
Exercisable at end of period, Weighted-Average Remaining Contractual Life (In years) 1 year 5 months
Outstanding at end of period, Aggregate Intrinsic Value $ 25
Exercisable at end of period, Aggregate Intrinsic Value $ 25