Stock-based Compensation (Schedule Of Stock Option Activity) (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	6 Months Ended
	Jan. 26, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Beginning of year, Options	1,101
Granted, Options	0
Exercised, Options	(246)
Terminated, Options	0
End of year, Options	855
Exercisable at end of period, Options	855
Beginning of period, Weighted-Average Exercise Price	$ 27.25
Granted, Weighted-Average Exercise Price	$ 0.00
Exercised, Weighted-Average Exercise Price	$ 26.72
Terminated, Weighted-Average Exercise Price	$ 0.00
End of period, Weighted-Average Exercise Price	$ 27.41
Exercisable at end of period, Weighted-Average Exercise Price	$ 27.41
Outstanding at end of period, Weighted-Average Remaining Contractual Life (In years)	11 months
Exercisable at end of period, Weighted-Average Remaining Contractual Life (In years)	11 months
Outstanding at end of period, Aggregate Intrinsic Value	$ 13
Exercisable at end of period, Aggregate Intrinsic Value	$ 13