Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024
Earnings Per Share [Abstract]
Net income available to common stockholders, basic	$ 224	$ 258	$ 394	$ 453
Net income available to common stockholders, diluted	$ 224	$ 258	$ 394	$ 453
Share data (in thousands):
Basic average common shares outstanding	471,873	472,660	472,233	472,647
Dilutive effect of stock-based awards	734	397	487	350
Diluted average common shares outstanding	472,607	473,057	472,720	472,997
Basic earnings per share (dollars per share)	$ 0.47	$ 0.55	$ 0.83	$ 0.96
Diluted earnings per share (dollars per share)	$ 0.47	$ 0.55	$ 0.83	$ 0.96