Stockholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Jan. 31, 2025	Oct. 31, 2024	Jul. 31, 2024	Jan. 31, 2024	Oct. 31, 2023	Jul. 31, 2023	Jan. 31, 2025	Jan. 31, 2024
Beginning balance	$ 3,705	$ 3,465	$ 3,517	$ 3,454	$ 3,338	$ 3,268	$ 3,517	$ 3,268
Net income	270	258	195	285	242	231	723	758
Net other comprehensive income (loss)	(52)	(27)	(43)	66	(91)	36	(122)	11
Declaration of cash dividends	(107)		(206)	(206)		(197)
Acquisition of treasury stock				(361)	(42)
Stock-based compensation expense	7	9	4	7	7	4
Stock issued under compensation plans			3			3
Loss on issuance of treasury stock issued under compensation plans			(5)			(7)
Ending balance	3,823	3,705	3,465	3,245	3,454	3,338	3,823	3,245
Additional Paid-in Capital [Member]
Beginning balance	21	12	13	8	1	1	13	1
Stock-based compensation expense	7	9	4	7	7	4
Loss on issuance of treasury stock issued under compensation plans			(5)			(4)
Ending balance	28	21	12	15	8	1	28	15
Retained Earnings [Member]
Beginning balance	4,508	4,250	4,261	3,916	3,674	3,643	4,261	3,643
Net income	270	258	195	285	242	231
Declaration of cash dividends	(107)		(206)	(206)		(197)
Loss on issuance of treasury stock issued under compensation plans						(3)
Ending balance	4,671	4,508	4,250	3,995	3,916	3,674	4,671	3,995
AOCI Attributable to Parent [Member]
Beginning balance	(291)	(264)	(221)	(290)	(199)	(235)	(221)	(235)
Net other comprehensive income (loss)	(52)	(27)	(43)	66	(91)	36
Ending balance	(343)	(291)	(264)	(224)	(290)	(199)	(343)	(224)
Treasury Stock, Common [Member]
Beginning balance	(605)	(605)	(608)	(252)	(210)	(213)	(608)	(213)
Acquisition of treasury stock				(361)	(42)
Stock issued under compensation plans			3			3
Ending balance	(605)	(605)	(605)	(613)	(252)	(210)	(605)	(613)
Common stock, Class A, voting [Member] | Common Stock [Member]
Beginning balance	25	25	25	25	25	25	25	25
Ending balance	25	25	25	25	25	25	25	25
Common stock, Class B, nonvoting [Member] | Common Stock [Member]
Beginning balance	47	47	47	47	47	47	47	47
Ending balance	$ 47	$ 47	$ 47	$ 47	$ 47	$ 47	$ 47	$ 47