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Retirement Plans (Pension Expected Benefit Payments) (Details) - Pension Benefits [Member]
$ in Millions
Dec. 31, 2017
USD ($)
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]  
2018 $ 265
2019 256
2020 251
2021 245
2022 237
2023 - 2027 1,122
Total $ 2,376