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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, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]          
Employer Contributions to Defined Contribution Plans     $ 594 $ 535 $ 513
Pension Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Years of Service     30 years    
Employer contributions     $ 3,087 1,215 913
U.S. hourly pension plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Employer contributions     2,000    
U.S. hourly and salaried pension plans [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Employer contributions     $ 2,054 95 143
Period Of Time For Which There Are No Significant Mandatory Contributions For Qualified Plans     5 years    
Canada and United Kingdom Pension Plans [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Pension Plan Funding Requirement over next Five Years $ 1,800   $ 1,800    
Non-US Pension Plans [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Employer contributions     1,033 1,120 770
Estimated Future Employer Contributions in Next Fiscal Year     970    
U.S. non-qualified pension plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Estimated Future Employer Contributions in Next Fiscal Year     73    
US OPEB Plans [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Employer contributions     $ 335 $ 340 $ 354
US Pension and OPEB Plans [Member]          
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]          
Remeasurement gain (loss) due to mortality assumptions $ 888 $ (2,200)