Stockholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended
	Jul. 31, 2024	Jul. 31, 2023
Beginning balance	$ 3,517	$ 3,268
Net income	195	231
Net other comprehensive income (loss)	(43)	36
Declaration of cash dividends	(206)	(197)
Stock-based compensation expense	4	4
Stock issued under compensation plans	3	3
Loss on issuance of treasury stock issued under compensation plans	(5)	(7)
Ending balance	3,465	3,338
Additional Paid-in Capital [Member]
Beginning balance	13	1
Stock-based compensation expense	4	4
Loss on issuance of treasury stock issued under compensation plans	(5)	(4)
Ending balance	12	1
Retained Earnings [Member]
Beginning balance	4,261	3,643
Net income	195	231
Declaration of cash dividends	(206)	(197)
Loss on issuance of treasury stock issued under compensation plans		(3)
Ending balance	4,250	3,674
AOCI Attributable to Parent [Member]
Beginning balance	(221)	(235)
Net other comprehensive income (loss)	(43)	36
Ending balance	(264)	(199)
Treasury Stock, Common [Member]
Beginning balance	(608)	(213)
Stock issued under compensation plans	3	3
Ending balance	(605)	(210)
Common stock, Class A, voting [Member] | Common Stock [Member]
Beginning balance	25	25
Ending balance	25	25
Common stock, Class B, nonvoting [Member] | Common Stock [Member]
Beginning balance	47	47
Ending balance	$ 47	$ 47