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Pension and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Other Postretirement Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 15 $ 15 $ 43 $ 43
Interest cost 17 20 52 61
Expected return on plan assets (21) (20) (63) (59)
Amortization of unrecognized prior service credit (21) (24) (63) (74)
Net loss amortization 0 0 1 1
Termination benefits 0 0 2 1
Curtailments (1) (1) (7) (6)
Net periodic benefit cost (11) (10) (35) (33)
U.S. | Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 77 80 245 234
Interest cost 109 114 324 341
Expected return on plan assets (209) (210) (634) (646)
Amortization of unrecognized prior service credit (12) (13) (37) (40)
Net loss amortization 63 46 174 135
Termination benefits 1 3 18 11
Curtailments 3 4 7 8
Settlements 0 0 1 0
Net periodic benefit cost 32 24 98 43
International | Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 56 66 181 189
Interest cost 43 44 134 127
Expected return on plan assets (106) (101) (326) (292)
Amortization of unrecognized prior service credit (3) (3) (10) (8)
Net loss amortization 21 25 64 72
Termination benefits 0 1 0 2
Curtailments 0 (1) (1) (1)
Settlements 0 0 3 0
Net periodic benefit cost $ 11 $ 31 $ 45 $ 89