Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Jul. 31, 2022	Jul. 31, 2021
Earnings Per Share [Abstract]
Net income available to common stockholders	$ 249	$ 192
Share data (in thousands):
Basic average common shares outstanding	479,079	478,793
Dilutive effect of stock-based awards	1,365	1,925
Diluted average common shares outstanding	480,444	480,718
Basic earnings per share (dollars per share)	$ 0.52	$ 0.40
Diluted earnings per share (dollars per share)	$ 0.52	$ 0.40