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Pensions and Other Postretirement Benefits - Schedule of Net Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Non-service cost components of net periodic pension and OPEB income $ 230 $ 421
Global OPEB Plans [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Service cost 4 5
Interest cost 54 50
Expected return on plan assets 0 0
Amortization of prior service cost (credit) (3) (4)
Amortization of net actuarial losses 8 13
Net periodic pension and OPEB (income) expense 63 64
U.S. [Member] | Pension Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Service cost including administrative expenses 98 83
Interest cost 566 513
Expected return on plan assets (868) (973)
Amortization of prior service cost (credit) (1) (1)
Amortization of net actuarial losses 3 2
Net periodic pension and OPEB (income) expense (202) (376)
Non-U.S. [Member] | Pension Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Service cost 35 66
Interest cost 120 120
Expected return on plan assets (195) (212)
Amortization of prior service cost (credit) 1 1
Amortization of net actuarial losses 29 37
Net periodic pension and OPEB (income) expense $ (10) $ 12