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Pension and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 77 $ 73
Interest cost 113 113
Expected return on plan assets (218) (210)
Amortization of unrecognized prior service credit (13) (14)
Net loss amortization 44 29
Termination benefits 5 4
Curtailments 3 0
Net periodic benefit cost 11 (5)
International    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 61 58
Interest cost 41 52
Expected return on plan assets (94) (95)
Amortization of unrecognized prior service credit (2) (3)
Net loss amortization 23 22
Termination benefits 1 0
Curtailments 0 1
Net periodic benefit cost 30 35
Other Postretirement Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 14 13
Interest cost 20 21
Expected return on plan assets (19) (35)
Amortization of unrecognized prior service credit (25) (26)
Termination benefits 1 1
Curtailments (3) (1)
Net periodic benefit cost $ (12) $ (27)