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Pension and Other Postretirement Benefits (Changes in Funded Status of Benefit Plans Recognized in Other Comprehensive (Income) Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2024
Apr. 30, 2023
Apr. 30, 2022
Pension Benefits [Member]      
Amounts recognized in OCI      
Net actuarial gain (loss) $ 20 $ (29) $ 62
Amortization reclassified to earnings:      
Prior service cost (credit) 1 1 1
Net actuarial loss (gain) 6 38 35
Net amount recognized in OCI 26 10 98
Medical and Life Insurance Benefits [Member]      
Amounts recognized in OCI      
Net actuarial gain (loss) 3 2 5
Amortization reclassified to earnings:      
Prior service cost (credit) 0 0 (2)
Net actuarial loss (gain) 0 0 1
Net amount recognized in OCI $ 3 $ 2 $ 4