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Pension And Other Postretirement Benefits (Expected Contribution Pension Benefits And Other Postretirement Benefits) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
U.S. [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Contributions expected in 2019 $ 1,020
Benefits payments expected in 2019 1,353
Benefits payments expected in 2020 1,312
Benefits payments expected in 2021 1,310
Benefits payments expected in 2022 1,302
Benefits payments expected in 2023 1,307
Benefits payments expected in 2024-2028 6,393
Pension Benefits - Non-U.S. [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Contributions expected in 2019 680
Benefits payments expected in 2019 1,113
Benefits payments expected in 2020 1,111
Benefits payments expected in 2021 1,127
Benefits payments expected in 2022 1,138
Benefits payments expected in 2023 1,156
Benefits payments expected in 2024-2028 5,806
Gross Other Post Retirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Benefits payments expected in 2019 454
Benefits payments expected in 2020 458
Benefits payments expected in 2021 461
Benefits payments expected in 2022 463
Benefits payments expected in 2023 456
Benefits payments expected in 2024-2028 2,259
Other Postretirement Benefits Medicare Subsidy Receipt [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Benefits payments expected in 2019 19
Benefits payments expected in 2020 20
Benefits payments expected in 2021 20
Benefits payments expected in 2022 22
Benefits payments expected in 2023 23
Benefit payments expected in 2024-2028 $ 126