Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021
Earnings Per Share [Abstract]
Net income available to common stockholders	$ 227	$ 236	$ 476	$ 428
Share data (in thousands):
Basic average common shares outstanding	479,138	478,857	479,106	478,822
Dilutive effect of stock-based awards	1,411	1,661	1,388	1,793
Diluted average common shares outstanding	480,549	480,518	480,494	480,615
Basic earnings per share (dollars per share)	$ 0.47	$ 0.49	$ 0.99	$ 0.89
Diluted earnings per share (dollars per share)	$ 0.47	$ 0.49	$ 0.99	$ 0.89