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Pension and Other Postretirement Benefits (Schedule of Expected Estimated Benefit Payments) (Details)
$ in Millions
Jun. 30, 2020
USD ($)
Pension Benefits  
Fiscal year  
2021 $ 61
2022 58
2023 58
2024 60
2025 62
2026-2030 346
Postretirement Benefits  
Fiscal year  
2021 4
2022 5
2023 5
2024 5
2025 5
2026-2030 $ 26