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Pensions And Other Postretirement Benefits - Contributions and Plan Amendments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions to defined contribution plans $ 573 $ 537 $ 617
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Years of service 30 years    
Employer contributions $ 464 615 1,700
Pension Plan | Qualified Plan      
Defined Benefit Plan Disclosure [Line Items]      
Period of time for which there are no mandatory contributions for qualified plans 5 years    
Pension Plan | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions $ 68 83 76
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]      
Mandatory contributions over the next five years 0    
Pension Plan | Non-U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 396 532 1,624
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 366    
Other Postretirement Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 387 370  
Other Postretirement Benefits Plan | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 343 $ 326 325
Pension Plan and Other Postretirement Benefits Plan | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Remeasurement decrease due to mortality assumptions $ 686   $ 264