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Pensions and Other Postretirement Benefits - Schedule of Net Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Non-service cost components of net periodic pension and OPEB income $ 401 $ 369 $ 1,200 $ 1,000
Global OPEB Plans [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 5 4 15 14
Interest cost 49 51 147 149
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (credit) (4) (3) (11) (10)
Amortization of net actuarial (gains) losses 14 8 40 24
Curtailments, settlements and other 0 0 0 0
Net periodic pension and OPEB (income) expense 64 60 191 177
U.S. [Member] | Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost including administrative expenses 83 79 248 237
Interest cost 513 536 1,538 1,608
Expected return on plan assets (972) (919) (2,917) (2,757)
Amortization of prior service cost (credit) (1) (1) (3) (3)
Amortization of net actuarial (gains) losses 2 (2) 7 (5)
Curtailments, settlements and other 0 0 0 0
Net periodic pension and OPEB (income) expense (375) (307) (1,127) (920)
Non-U.S. [Member] | Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 33 45 138 131
Interest cost 112 115 349 366
Expected return on plan assets (201) (185) (621) (528)
Amortization of prior service cost (credit) 1 2 3 4
Amortization of net actuarial (gains) losses 35 29 109 124
Curtailments, settlements and other 18 0 18 0
Net periodic pension and OPEB (income) expense (2) $ 6 (4) $ 97
Estimated contributions in 2018 1,600   1,600  
Non-U.S. [Member] | Pension Plan [Member] | U.K. and Canada [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Contributions to pension plans 584      
Non-U.S. [Member] | Pension Plan [Member] | Korea [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Estimated contributions in 2018 $ 300   $ 300