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Pensions And Other Postretirement Benefits - Contributions and Plan Amendments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Contribution Plan [Abstract]      
Employer contributions to defined contribution plans $ 537 $ 617 $ 650
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Years of service 30 years    
Employer contributions $ 615 1,700 1,230
Pension Plan | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 83 76 77
Pension Plan | U.S. | Nonqualified Plan      
Defined Benefit Plan Disclosure [Line Items]      
Estimated contributions in next fiscal year $ 70    
Pension Plan | U.S. | Qualified Plan      
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 | Non-U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 532 1,624 1,153
Estimated contributions in next fiscal year 500    
Pension Plan | Canada and United Kingdom      
Defined Benefit Plan Disclosure [Line Items]      
Mandatory contributions over the next five years 368    
Other Postretirement Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 370 369  
Other Postretirement Benefits Plan | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions $ 326 325 $ 323
Pension Plan and Other Postretirement Benefits Plan | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Remeasurement decrease due to mortality assumptions   $ 264