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Pensions and Other Postretirement Benefits - Schedule of Net Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Non-service cost components of net periodic pension and OPEB income $ 421 $ 329
Global OPEB Plans [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Service cost 5 4
Interest cost 50 49
Expected return on plan assets 0 0
Amortization of prior service cost (credit) (4) (3)
Amortization of net actuarial (gains) losses 13 8
Net periodic pension and OPEB (income) expense 64 58
U.S. [Member] | Pension Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Service cost including administrative expenses 83 79
Interest cost 513 536
Expected return on plan assets (973) (919)
Amortization of prior service cost (credit) (1) (1)
Amortization of net actuarial (gains) losses 2 (1)
Net periodic pension and OPEB (income) expense (376) (306)
Non-U.S. [Member] | Pension Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Service cost 66 46
Interest cost 120 125
Expected return on plan assets (212) (171)
Amortization of prior service cost (credit) 1 1
Amortization of net actuarial (gains) losses 37 47
Net periodic pension and OPEB (income) expense 12 $ 48
Estimated contributions in 2018 $ 1,200