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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Non-service cost components of net periodic pension and OPEB income $ 232 $ 420 $ 462 $ 841
Global OPEB Plans [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 4 5 8 10
Interest cost 55 48 109 98
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (credit) (4) (3) (7) (7)
Amortization of net actuarial losses 7 13 15 26
Net periodic pension and OPEB (income) expense 62 63 125 127
U.S. [Member] | Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost including administrative expenses 98 82 196 165
Interest cost 566 512 1,132 1,025
Expected return on plan assets (871) (972) (1,739) (1,945)
Amortization of prior service cost (credit) (1) (1) (2) (2)
Amortization of net actuarial losses 3 3 6 5
Net periodic pension and OPEB (income) expense (205) (376) (407) (752)
Non-U.S. [Member] | Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 29 39 64 105
Interest cost 118 117 238 237
Expected return on plan assets (192) (208) (387) (420)
Amortization of prior service cost (credit) 1 1 2 2
Amortization of net actuarial losses 30 37 59 74
Net periodic pension and OPEB (income) expense $ (14) $ (14) $ (24) $ (2)