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Retirement Plans (Expected Benefit Payments Over The Next Ten Years) (Details) - Pension Benefits [Member]
$ in Millions
Dec. 31, 2018
USD ($)
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]  
2019 $ 256
2020 252
2021 251
2022 246
2023 244
2024 - 2028 1,165
Total $ 2,414