Stock-based Compensation (Schedule Of Stock Option Activity) (Details) $ / shares in Units, shares in Thousands, $ in Millions	6 Months Ended
	Jan. 26, 2020 USD ($) $ / shares shares
Share-based Payment Arrangement [Abstract]
Beginning of period, Options | shares	2,059
Granted, Options | shares	0
Exercised, Options | shares	(92)
Terminated, Options | shares	(155)
End of period, Options | shares	1,812
Exercisable at end of period, Options | shares	1,223
Beginning of period, Weighted-Average Exercise Price | $ / shares	$ 46.17
Granted, Weighted-Average Exercise Price | $ / shares	0
Exercised, Weighted-Average Exercise Price | $ / shares	41.58
Terminated, Weighted-Average Exercise Price | $ / shares	49.46
End of period, Weighted-Average Exercise Price | $ / shares	46.12
Exercisable at end of period, Weighted-Average Exercise Price | $ / shares	$ 49.74
Outstanding at end of period, Weighted-Average Remaining Contractual Life (In years)	7 years 3 months 18 days
Exercisable at end of period, Weighted-Average Remaining Contractual Life (In years)	6 years 8 months 12 days
Outstanding at end of period, Aggregate Intrinsic Value | $	$ 8
Exercisable at end of period, Aggregate Intrinsic Value | $	$ 2