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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, 2022
Apr. 30, 2021
Apr. 30, 2020
Pension Benefits [Member]      
Amounts recognized in OCI      
Net actuarial gain (loss) $ 62 $ 69 $ (115)
Amortization reclassified to earnings:      
Prior service cost (credit) 1 1 1
Net actuarial loss (gain) 35 27 20
Net amount recognized in OCI 98 97 (94)
Medical and Life Insurance Benefits [Member]      
Amounts recognized in OCI      
Net actuarial gain (loss) 5 1 (2)
Amortization reclassified to earnings:      
Prior service cost (credit) (2) (3) (3)
Net actuarial loss (gain) 1 1 1
Net amount recognized in OCI $ 4 $ (1) $ (4)