Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Apr. 30, 2024	Apr. 30, 2023
Deferred tax assets:
Postretirement and other benefits	$ 65	$ 75
Accrued liabilities and other	47	35
Inventories	26	26
Lease liabilities	27	23
Loss and credit carryforwards	65	62
Total deferred tax assets	230	221
Valuation allowance	(16)	(14)
Total deferred tax assets, net of valuation allowance	214	207
Deferred tax liabilities:
Intangible assets	(295)	(323)
Property, plant, and equipment	(93)	(98)
Right-of-use assets	(27)	(23)
Derivative instruments	(3)	(3)
Equity method investments	(37)	0
Other	(5)	(17)
Total deferred tax liabilities	(460)	(464)
Net deferred tax liability	$ (246)	$ (257)