Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock [Member] Common stock, Class A, voting [Member]	Common Stock [Member] Common Stock, Class B, nonvoting [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock, Common [Member]
Beginning Balance at Apr. 30, 2020	$ 1,975	$ 25	$ 47	$ 0	$ 2,708	$ (547)	$ (258)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	903				903
Net other comprehensive income (loss)	125					125
Cash dividends	(338)				(338)
Stock-based compensation expense	12			12
Stock issued under compensation plans	21						21
Loss on issuance of treasury stock issued under compensation plans	(42)			(12)	(30)
Ending Balance at Apr. 30, 2021	2,656	25	47	0	3,243	(422)	(237)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	838				838
Net other comprehensive income (loss)	70					70
Cash dividends	(831)				(831)
Stock-based compensation expense	15			15
Stock issued under compensation plans	12						12
Loss on issuance of treasury stock issued under compensation plans	(23)			(15)	(8)
Ending Balance at Apr. 30, 2022	2,737	25	47	0	3,242	(352)	(225)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	783				783
Net other comprehensive income (loss)	117					117
Cash dividends	(378)				(378)
Stock-based compensation expense	18			18
Stock issued under compensation plans	12						12
Loss on issuance of treasury stock issued under compensation plans	(21)			(17)	(4)
Ending Balance at Apr. 30, 2023	$ 3,268	$ 25	$ 47	$ 1	$ 3,643	$ (235)	$ (213)