Stock-based Compensation (Schedule Of Stock Option Activity) (Details) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Oct. 27, 2019 USD ($) $ / shares shares
Share-based Payment Arrangement [Abstract]
Beginning of period, Options | shares	2,059
Granted, Options | shares	0
Exercised, Options | shares	(23)
Terminated, Options | shares	(155)
End of period, Options | shares	1,881
Exercisable at end of period, Options | shares	1,231
Beginning of period, Weighted-Average Exercise Price | $ / shares	$ 46.17
Granted, Weighted-Average Exercise Price | $ / shares	0
Exercised, Weighted-Average Exercise Price | $ / shares	39.71
Terminated, Weighted-Average Exercise Price | $ / shares	49.46
End of period, Weighted-Average Exercise Price | $ / shares	45.98
Exercisable at end of period, Weighted-Average Exercise Price | $ / shares	$ 50.04
Outstanding at end of period, Weighted-Average Remaining Contractual Life (In years)	7 years 7 months 6 days
Exercisable at end of period, Weighted-Average Remaining Contractual Life (In years)	6 years 10 months 24 days
Outstanding at end of period, Aggregate Intrinsic Value | $	$ 6
Exercisable at end of period, Aggregate Intrinsic Value | $	$ 1