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Pensions and Other Postretirement Benefits-Future Payments (Details) - Postretirement Plans Other Than Pensions [Member]
$ in Millions
Dec. 31, 2019
USD ($)
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]  
2020 $ 4
2021 4
2022 4
2023 4
2024 3
2025-2029 $ 14