Stockholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Jan. 31, 2024	Oct. 31, 2023	Jul. 31, 2023	Jan. 31, 2023	Oct. 31, 2022	Jul. 31, 2022	Jan. 31, 2024	Jan. 31, 2023
Beginning balance	$ 3,454	$ 3,338	$ 3,268	$ 3,040	$ 2,807	$ 2,737	$ 3,268	$ 2,737
Net income	285	242	231	100	227	249	758	576
Net other comprehensive income (loss)	66	(91)	36	91	2	1	11	94
Declaration of cash dividends	(206)		(197)	(197)		(180)
Acquisition of treasury stock	(361)	(42)
Stock-based compensation expense	7	7	4	4	5	4
Stock issued under compensation plans			3	1	1	4
Loss on issuance of treasury stock issued under compensation plans			(7)	(1)	(2)	(8)
Ending balance	3,245	3,454	3,338	3,038	3,040	2,807	3,245	3,038
Additional Paid-in Capital [Member]
Beginning balance	8	1	1	3	0	0	1	0
Stock-based compensation expense	7	7	4	4	5	4
Loss on issuance of treasury stock issued under compensation plans			(4)	(1)	(2)	(4)
Ending balance	15	8	1	6	3	0	15	6
Retained Earnings [Member]
Beginning balance	3,916	3,674	3,643	3,534	3,307	3,242	3,643	3,242
Net income	285	242	231	100	227	249
Declaration of cash dividends	(206)		(197)	(197)		(180)
Loss on issuance of treasury stock issued under compensation plans			(3)			(4)
Ending balance	3,995	3,916	3,674	3,437	3,534	3,307	3,995	3,437
AOCI Attributable to Parent [Member]
Beginning balance	(290)	(199)	(235)	(349)	(351)	(352)	(235)	(352)
Net other comprehensive income (loss)	66	(91)	36	91	2	1
Ending balance	(224)	(290)	(199)	(258)	(349)	(351)	(224)	(258)
Treasury Stock, Common [Member]
Beginning balance	(252)	(210)	(213)	(220)	(221)	(225)	(213)	(225)
Acquisition of treasury stock	(361)	(42)
Stock issued under compensation plans			3	1	1	4
Ending balance	(613)	(252)	(210)	(219)	(220)	(221)	(613)	(219)
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