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Retirement Benefits (Estimated Future Payments For Pension Benefits And Postretirement Benefits) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 131
2022 128
2023 126
2024 121
2025 119
2026 - 2030 552
Other Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 35
2022 34
2023 32
2024 31
2025 30
2026 - 2030 $ 125