Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Earnings Per Share [Abstract]
Net income available to common stockholders	$ 783	$ 838	$ 903
Share data (in thousands):
Basic average common shares outstanding (shares)	479,155	478,879	478,527
Dilutive effect of stock-based awards (shares)	1,310	1,686	2,150
Diluted average common shares outstanding (shares)	480,465	480,565	480,677
Basic earnings per share (dollars per share)	$ 1.63	$ 1.75	$ 1.89
Diluted earnings per share (dollars per share)	$ 1.63	$ 1.74	$ 1.88
Antidilutive common stock-based awards excluded from calculation of diluted earnings per share (shares)	1,107	691	234