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Retirement Benefits (Estimated Future Payments For Pension Benefits And Postretirement Benefits) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 126
2021 126
2022 127
2023 124
2024 120
2025 - 2029 567
Other Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 37
2021 36
2022 35
2023 34
2024 33
2025 - 2029 $ 140