Stock-Based Compensation SSARs (Details) - Stock Appreciation Rights (SARs) [Member] $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Apr. 30, 2022 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding, beginning balance (shares)	4,311
SSARs granted (shares)	451
SSARs exercised (shares)	(565)
SSARs forfeited or expired (shares)	(29)
SSARs, other (shares)	64
Outstanding, ending balance (shares)	4,232
SSARs exercisable (shares)	2,829
Weighted Average Exercise Price [Roll Forward]
Weighted average exercise price, beginning (dollars per share) | $ / shares	$ 43.54
Weighted average exercise price, grants in period (dollars per share) | $ / shares	71.24
Weighted average exercise price, exercises in period (dollars per share) | $ / shares	29.67
Weighted average exercise price, forfeitures and expirations in period (dollars per share) | $ / shares	63.82
Weighted average exercise price, ending (dollars per share) | $ / shares	47.54
Weighted average exercise price, exercisable (dollars per share) | $ / shares	$ 39.55
SSARs outstanding, Weighted Average Remaining Contractual Term (years)	4 years 10 months 24 days
SSARs exercisable, Weighted Average Remaining Contractual Term (years)	3 years 6 months
SSARs outstanding, Aggregate Intrinsic Value | $	$ 86
SSARs exercisable, Aggregate Intrinsic Value | $	$ 79