Stock-based Compensation (Schedule Of Stock Option Activity) (Details) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Oct. 31, 2021 USD ($) $ / shares shares
Share-based Payment Arrangement [Abstract]
Beginning of period, Options | shares	1,372
Granted, Options | shares	0
Exercised, Options | shares	(32)
Terminated, Options | shares	0
End of period, Options | shares	1,340
Exercisable at end of period, Options | shares	1,129
Beginning of period, Weighted-Average Exercise Price | $ / shares	$ 45.61
Granted, Weighted-Average Exercise Price | $ / shares	0
Exercised, Weighted-Average Exercise Price | $ / shares	36.60
Terminated, Weighted-Average Exercise Price | $ / shares	0
End of period, Weighted-Average Exercise Price | $ / shares	45.83
Exercisable at end of period, Weighted-Average Exercise Price | $ / shares	$ 47.84
Outstanding at end of period, Weighted-Average Remaining Contractual Life (In years)	5 years 7 months 6 days
Exercisable at end of period, Weighted-Average Remaining Contractual Life (In years)	5 years 3 months 18 days
Outstanding at end of period, Aggregate Intrinsic Value | $	$ 2
Exercisable at end of period, Aggregate Intrinsic Value | $	$ 1