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Pension And Postretirement Benefits (Estimated Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Pension Benefit [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Estimated future benefit payments under our pension and postretirement plans - 2018 $ 4,633
Estimated future benefit payments under our pension and postretirement plans - 2019 4,191
Estimated future benefit payments under our pension and postretirement plans - 2020 4,180
Estimated future benefit payments under our pension and postretirement plans - 2021 4,149
Estimated future benefit payments under our pension and postretirement plans - 2022 4,063
Estimated future benefit payments under our pension and postretirement plans - Years 2023 - 2027 19,653
Postretirement Benefit [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Estimated future benefit payments under our pension and postretirement plans - 2018 1,751
Estimated future benefit payments under our pension and postretirement plans - 2019 1,719
Estimated future benefit payments under our pension and postretirement plans - 2020 1,707
Estimated future benefit payments under our pension and postretirement plans - 2021 1,692
Estimated future benefit payments under our pension and postretirement plans - 2022 1,670
Estimated future benefit payments under our pension and postretirement plans - Years 2023 - 2027 $ 7,267