Stock-based Compensation (Schedule Of Stock Option Activity) (Details) $ / shares in Units, shares in Thousands, $ in Millions	6 Months Ended
	Jan. 31, 2021 USD ($) $ / shares shares
Share-based Payment Arrangement [Abstract]
Beginning of period, Options | shares	1,423
Granted, Options | shares	0
Exercised, Options | shares	0
Terminated, Options | shares	0
End of period, Options | shares	1,423
Exercisable at end of period, Options | shares	1,130
Beginning of period, Weighted-Average Exercise Price | $ / shares	$ 45.42
Granted, Weighted-Average Exercise Price | $ / shares	0
Exercised, Weighted-Average Exercise Price | $ / shares	0
Terminated, Weighted-Average Exercise Price | $ / shares	0
End of period, Weighted-Average Exercise Price | $ / shares	45.42
Exercisable at end of period, Weighted-Average Exercise Price | $ / shares	$ 48.00
Outstanding at end of period, Weighted-Average Remaining Contractual Life (In years)	6 years 4 months 24 days
Exercisable at end of period, Weighted-Average Remaining Contractual Life (In years)	6 years 1 month 6 days
Outstanding at end of period, Aggregate Intrinsic Value | $	$ 7
Exercisable at end of period, Aggregate Intrinsic Value | $	$ 3