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Retirement Plans Retirement Plans (Projected Future Pension Benefit Payments, Excluding Any Termination Beneftis) (Details) - Domestic Plan [Member]
$ in Millions
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Projected future pension benefit payments, 2017 $ 708
Projected future pension benefit payments, 2018 709
Projected future pension benefit payments, 2019 718
Projected future pension benefit payments, 2020 727
Projected future pension benefit payments, 2021 735
Projected future pension benefit payments, 2022 - 2025 $ 3,763