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Pensions And Other Postretirement Benefits Contributions and Plan Amendments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Contribution Plan [Abstract]      
Employer contributions to defined contribution plans $ 617 $ 650 $ 589
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Years of service 30 years    
Employer contributions $ 1,700 1,230 3,076
Pension Plan [Member] | U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 76 77 2,054
Pension Plan [Member] | U.S. [Member] | Nonqualified Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Estimated contributions in next fiscal year $ 70    
Pension Plan [Member] | U.S. [Member] | Qualified Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Period of time for which there are no mandatory contributions for qualified plans 5 years    
Mandatory contributions over the next five years $ 0    
Pension Plan [Member] | U.S. [Member] | U.S. Hourly [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions     2,000
Pension Plan [Member] | Non-U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 1,624 1,153 1,022
Estimated contributions in next fiscal year 600    
Pension Plan [Member] | Canada and United Kingdom [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Mandatory contributions over the next five years 310    
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 369 406  
Other Postretirement Benefits Plan [Member] | U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 325 $ 323 335
Pension Plan and Other Postretirement Benefits Plan [Member] | U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Remeasurement decrease due to mortality assumptions 264   $ 888
United Kingdom and Canada [Member] | Pension Plan [Member] | Non-U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions $ 584