v3.26.1
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, 2026
Apr. 30, 2025
Apr. 30, 2024
Pension Benefits [Member]      
Amounts recognized in OCI      
Prior service credit (cost) $ (9) $ 0 $ (1)
Net actuarial gain (loss) 8 (6) 20
Amortization reclassified to earnings:      
Prior service cost (credit) 1 1 1
Net actuarial loss (gain) 28 2 6
Net amount recognized in OCI 28 (3) 26
Medical and Life Insurance Benefits [Member]      
Amounts recognized in OCI      
Prior service credit (cost) 0 0 0
Net actuarial gain (loss) 0 (2) 3
Amortization reclassified to earnings:      
Prior service cost (credit) 0 (1) 0
Net actuarial loss (gain) 0 0 0
Net amount recognized in OCI $ 0 $ (3) $ 3