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Retirement Benefits - Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Worldwide OPEB        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 13 $ 12 $ 27 $ 24
Interest cost 49 49 98 98
Expected return on assets 0 0 0 0
Amortization of prior service costs/(credits) (28) (29) (55) (59)
Net remeasurement (gain)/loss 0 0 0 0
Separation programs/other 1 0 1 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment 0 0 0 0
Net periodic benefit cost/(income) 35 32 71 63
Defined Benefit Plan, Estimated Future Employer Contributions To Funded Plans in Current Fiscal Year 500   500  
Pension And Other Postretirement Expected Benefit Contributions Unfunded Plans 350   350  
Pension and Other Postretirement Benefit Contributions and Expected Future Employer Contributions To Funded and Unfunded Plans 850   850  
Payment for Pension and Other Postretirement Benefits     150  
Pension and Other Postretirement Benefit Contributions Unfunded Plans     150  
Foreign Plan [Member] | Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 151 125 303 259
Interest cost 173 173 349 332
Expected return on assets (329) (335) (663) (665)
Amortization of prior service costs/(credits) 7 9 13 18
Net remeasurement (gain)/loss 0 0 0 0
Separation programs/other 16 3 18 19
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment 0 0 0 0
Net periodic benefit cost/(income) 18 (25) 20 (37)
UNITED STATES | Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 136 134 272 267
Interest cost 366 381 733 762
Expected return on assets (722) (684) (1,444) (1,367)
Amortization of prior service costs/(credits) 35 35 71 71
Net remeasurement (gain)/loss 0 0 (26) 0
Separation programs/other 3 9 14 12
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment 0 0 (15) 0
Net periodic benefit cost/(income) $ (182) $ (125) $ (395) $ (255)