Stockholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended
	Jul. 31, 2023	Jul. 31, 2022
Beginning balance	$ 3,268	$ 2,737
Net income	231	249
Net other comprehensive income (loss)	36	1
Declaration of cash dividends	(197)	(180)
Stock-based compensation expense	4	4
Stock issued under compensation plans	3	4
Loss on issuance of treasury stock issued under compensation plans	(7)	(8)
Ending balance	3,338	2,807
Additional Paid-in Capital [Member]
Beginning balance	1	0
Stock-based compensation expense	4	4
Loss on issuance of treasury stock issued under compensation plans	(4)	(4)
Ending balance	1	0
Retained Earnings [Member]
Beginning balance	3,643	3,242
Net income	231	249
Declaration of cash dividends	(197)	(180)
Loss on issuance of treasury stock issued under compensation plans	(3)	(4)
Ending balance	3,674	3,307
AOCI Attributable to Parent [Member]
Beginning balance	(235)	(352)
Net other comprehensive income (loss)	36	1
Ending balance	(199)	(351)
Treasury Stock, Common [Member]
Beginning balance	(213)	(225)
Stock issued under compensation plans	3	4
Ending balance	(210)	(221)
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