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Retirement Benefits (Benefit Payments) (Details) $ in Millions | Dec. 31, 2019 USD ($)
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Other Postretirement Benefits (Gross, Before Medicare Part D) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
2020 | $ 20 | [1]
2021 | 20 |
2022 | 19 |
2023 | 18 |
2024 | 15 |
2025-2029 | 67 |
Unfunded Plans [Member] | Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
2020 | 7 | [1]
2021 | 8 |
2022 | 8 |
2023 | 8 |
2024 | 7 |
2025-2029 | $ 22 |
[1] | Expected benefit payments of funded pension plans are less than $1 million for the next ten years.

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