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Benefit Plans - Postretirement benefit payments (Details) - Postemployment Retirement Benefits $ in Millions | Dec. 31, 2018 USD ($)
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Expected future benefit payments |
2019 | $ 4
2020 | 4
2021 | 4
2022 | 5
2023 | 5
Years 2024 - 2028 | $ 23

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