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Retirement Benefits (Schedule Of Expected Payments From Qualified Trust And Company Funds) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Pension Benefits | Paid From Qualified Trust  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 257
2021 269
2022 274
2023 279
2024 284
2025 - 2029 1,446
Pension Benefits | Paid From Company Funds  
Defined Benefit Plan Disclosure [Line Items]  
2020 3
2021 3
2022 3
2023 3
2024 3
2025 - 2029 12
Postretirement Benefits | Paid From Qualified Trust  
Defined Benefit Plan Disclosure [Line Items]  
2020 58
2021 60
2022 61
2023 63
2024 64
2025 - 2029 313
Postretirement Benefits | Paid From Company Funds  
Defined Benefit Plan Disclosure [Line Items]  
2020 2
2021 2
2022 2
2023 2
2024 2
2025 - 2029 $ 12