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Pensions and Other Postretirement Benefits - Schedule of Net Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Non-service cost components of net periodic pension and OPEB income $ 420 $ 330 $ 841 $ 659
Global OPEB Plans [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 5 6 10 10
Interest cost 48 49 98 98
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (credit) (3) (4) (7) (7)
Amortization of net actuarial (gains) losses 13 8 26 16
Net periodic pension and OPEB (income) expense 63 59 127 117
U.S. [Member] | Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost including administrative expenses 82 79 165 158
Interest cost 512 536 1,025 1,072
Expected return on plan assets (972) (919) (1,945) (1,838)
Amortization of prior service cost (credit) (1) (1) (2) (2)
Amortization of net actuarial (gains) losses 3 (2) 5 (3)
Net periodic pension and OPEB (income) expense (376) (307) (752) (613)
Non-U.S. [Member] | Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 39 40 105 86
Interest cost 117 126 237 251
Expected return on plan assets (208) (172) (420) (343)
Amortization of prior service cost (credit) 1 1 2 2
Amortization of net actuarial (gains) losses 37 48 74 95
Net periodic pension and OPEB (income) expense (14) $ 43 (2) $ 91
Estimated contributions in 2018 1,200   1,200  
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