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Pensions And Other Postretirement Benefits - Contributions and Plan Amendments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions to defined contribution plans $ 606 $ 573 $ 537
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Years of service 30 years    
Employer contributions $ 438 464 615
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 $ 67 68 83
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 371 396 532
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 290    
Other Postretirement Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 400 387  
Other Postretirement Benefits Plan | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions $ 351 343 $ 326
Pension Plan and Other Postretirement Benefits Plan | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Remeasurement decrease due to mortality assumptions   $ 686