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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Millions
Apr. 30, 2022
Apr. 30, 2021
Deferred tax assets:    
Postretirement and other benefits $ 69 $ 90
Accrued liabilities and other 36 47
Inventories 40 30
Lease liabilities 20 17
Derivative instruments 0 5
Loss and credit carryforwards 69 63
Total deferred tax assets 234 252
Valuation allowance (27) (20)
Total deferred tax assets, net of valuation allowance 207 232
Deferred tax liabilities:    
Intangible assets (219) (214)
Property, plant, and equipment (87) (89)
Right-of-use assets (20) (17)
Derivative instruments (11) 0
Other (15) (11)
Total deferred tax liabilities (352) (331)
Net deferred tax liability $ (145) $ (99)