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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Non-service cost components of net periodic pension and OPEB income $ 125 $ 401 $ 587 $ 1,200
Global OPEB Plans [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 4 5 12 15
Interest cost 54 49 163 147
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (credit) (3) (4) (10) (11)
Amortization of net actuarial losses 7 14 22 40
Curtailments, settlements and other 0 0 0 0
Net periodic pension and OPEB (income) expense 62 64 187 191
U.S. [Member] | Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost including administrative expenses 99 83 295 248
Interest cost 566 513 1,698 1,538
Expected return on plan assets (871) (972) (2,610) (2,917)
Amortization of prior service cost (credit) (1) (1) (3) (3)
Amortization of net actuarial losses 2 2 8 7
Curtailments, settlements and other 0 0 0 0
Net periodic pension and OPEB (income) expense (205) (375) (612) (1,127)
Non-U.S. [Member] | Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 38 33 102 138
Interest cost 148 112 386 349
Expected return on plan assets (240) (201) (627) (621)
Amortization of prior service cost (credit) 2 1 4 3
Amortization of net actuarial losses 31 35 90 109
Curtailments, settlements and other 119 18 119 18
Net periodic pension and OPEB (income) expense $ 98 $ (2) $ 74 $ (4)