Stockholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Oct. 31, 2024	Jul. 31, 2024	Oct. 31, 2023	Jul. 31, 2023	Oct. 31, 2024	Oct. 31, 2023
Beginning balance	$ 3,465	$ 3,517	$ 3,338	$ 3,268	$ 3,517	$ 3,268
Net income	258	195	242	231	453	473
Net other comprehensive income (loss)	(27)	(43)	(91)	36	(70)	(55)
Declaration of cash dividends		(206)		(197)
Acquisition of treasury stock			(42)
Stock-based compensation expense	9	4	7	4
Stock issued under compensation plans		3		3
Loss on issuance of treasury stock issued under compensation plans		(5)		(7)
Ending balance	3,705	3,465	3,454	3,338	3,705	3,454
Additional Paid-in Capital [Member]
Beginning balance	12	13	1	1	13	1
Stock-based compensation expense	9	4	7	4
Loss on issuance of treasury stock issued under compensation plans		(5)		(4)
Ending balance	21	12	8	1	21	8
Retained Earnings [Member]
Beginning balance	4,250	4,261	3,674	3,643	4,261	3,643
Net income	258	195	242	231
Declaration of cash dividends		(206)		(197)
Loss on issuance of treasury stock issued under compensation plans				(3)
Ending balance	4,508	4,250	3,916	3,674	4,508	3,916
AOCI Attributable to Parent [Member]
Beginning balance	(264)	(221)	(199)	(235)	(221)	(235)
Net other comprehensive income (loss)	(27)	(43)	(91)	36
Ending balance	(291)	(264)	(290)	(199)	(291)	(290)
Treasury Stock, Common [Member]
Beginning balance	(605)	(608)	(210)	(213)	(608)	(213)
Acquisition of treasury stock			(42)
Stock issued under compensation plans		3		3
Ending balance	(605)	(605)	(252)	(210)	(605)	(252)
Common stock, Class A, voting [Member] | Common Stock [Member]
Beginning balance	25	25	25	25	25	25
Ending balance	25	25	25	25	25	25
Common stock, Class B, nonvoting [Member] | Common Stock [Member]
Beginning balance	47	47	47	47	47	47
Ending balance	$ 47	$ 47	$ 47	$ 47	$ 47	$ 47