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Retirement Benefits (Benefit Payments) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
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.