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Retirement Plans (Schedule Of Expected Benefit Payments) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Pension [Member]  
Benefit Payments [Abstract]  
2020 $ 224
2021 221
2022 220
2023 219
2024 220
Years 2025 - 2029 1,119
OPEB [Member]  
Benefit Payments [Abstract]  
2020 20
2021 19
2022 15
2023 15
2024 10
Years 2025 - 2029 $ 45