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Pension and Other Postretirement Benefits (Expected Benefit Payments) (Details)
$ in Millions
Apr. 30, 2022
USD ($)
Pension Benefits [Member]  
Expected benefit payments over the next 10 years  
2023 $ 64
2024 61
2025 60
2026 61
2027 62
2028 – 2032 312
Medical and Life Insurance Benefits [Member]  
Expected benefit payments over the next 10 years  
2023 3
2024 3
2025 3
2026 3
2027 3
2028 – 2032 $ 16