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Pension and Other Postretirement Benefits (Funded Status of Plans) (Details) - USD ($)
$ in Millions
Apr. 30, 2024
Apr. 30, 2023
Apr. 30, 2022
Funded Status of Plans      
Assets $ 576 $ 606  
Pension Benefits [Member]      
Funded Status of Plans      
Assets 576 606 $ 741
Obligations (679) (731) (846)
Funded status (103) (125)  
Medical and Life Insurance Benefits [Member]      
Funded Status of Plans      
Assets 0 0 0
Obligations (36) (40) $ (43)
Funded status $ (36) $ (40)