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Retirement Plans (Expected Benefit Payments Over The Next Ten Years) (Details) - Pension Benefits [Member]
$ in Millions
Dec. 31, 2019
USD ($)
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]  
2020 $ 296
2021 295
2022 286
2023 279
2024 277
2025 - 2029 1,308
Total $ 2,741