Stock-based Compensation (Schedule Of Stock Option Activity) (Details) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Jul. 28, 2019 USD ($) $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Beginning of year, Options | shares	1,537
Granted, Options | shares	596
Exercised, Options | shares	0
Terminated, Options | shares	(74)
End of year, Options | shares	2,059
Exercisable at end of period, Options | shares	1,035
Beginning of period, Weighted-Average Exercise Price | $ / shares	$ 50.36
Granted, Weighted-Average Exercise Price | $ / shares	35.74
Exercised, Weighted-Average Exercise Price | $ / shares	0.00
Terminated, Weighted-Average Exercise Price | $ / shares	49.05
End of period, Weighted-Average Exercise Price | $ / shares	46.17
Exercisable at end of period, Weighted-Average Exercise Price | $ / shares	$ 50.88
Outstanding at end of period, Weighted-Average Remaining Contractual Life (In years)	7 years 3 months
Exercisable at end of period, Weighted-Average Remaining Contractual Life (In years)	5 years 11 months
Outstanding at end of period, Aggregate Intrinsic Value | $	$ 3
Exercisable at end of period, Aggregate Intrinsic Value | $	$ 0