Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Jul. 31, 2023	Jul. 31, 2022
Earnings Per Share [Abstract]
Net income available to common stockholders, basic	$ 231	$ 249
Net income available to common stockholders, diluted	$ 231	$ 249
Share data (in thousands):
Basic average common shares outstanding	479,353	479,079
Dilutive effect of stock-based awards	1,030	1,365
Diluted average common shares outstanding	480,383	480,444
Basic earnings per share (dollars per share)	$ 0.48	$ 0.52
Diluted earnings per share (dollars per share)	$ 0.48	$ 0.52