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Pensions And Other Postretirement Benefits Contributions and Plan Amendments (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Contribution Plan [Abstract]        
Employer contributions to defined contribution plans   $ 650 $ 589 $ 530
US Pension and OPEB Plans [Member] | U.S. [Member]        
Defined Contribution Plan [Abstract]        
Remeasurement decrease due to mortality assumptions $ 888      
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Years of service   30 years    
Employer contributions   $ 1,230 3,076 1,203
Pension Plan [Member] | U.S. [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions   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] | U.S. [Member] | U.S. Hourly and Salaried [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions   77 2,054 95
Pension Plan [Member] | Non-U.S. [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions   1,153 1,022 1,108
Estimated contributions in next fiscal year   900    
Pension Plan [Member] | Canada and United Kingdom [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Mandatory contributions over the next five years   1,200    
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions   406 378  
Other Postretirement Benefits Plan [Member] | U.S. [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions   $ 323 $ 335 $ 340