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Pension and Other Postretirement Benefits (Expected Benefit Payments) (Details)
$ in Millions
Apr. 30, 2019
USD ($)
Pension Benefits [Member]  
Expected benefit payments over the next 10 years  
2020 $ 59
2021 58
2022 59
2023 60
2024 61
2025-2029 414
Medical and Life Insurance Benefits [Member]  
Expected benefit payments over the next 10 years  
2020 3
2021 3
2022 3
2023 3
2024 3
2025-2029 $ 16