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Pension and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 57 $ 57 $ 54
Interest cost 69 81 82
Expected return on plan assets (83) (78) (107)
Amortization of unrecognized prior service cost (84) (98) (106)
Net loss amortization 1 1 3
Termination benefits 3 8 4
Curtailments (8) (31) (18)
Settlements 0 0 0
Net periodic benefit cost (credit) (45) (60) (88)
United States | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 326 312 282
Interest cost 432 454 456
Expected return on plan assets (851) (862) (831)
Amortization of unrecognized prior service cost (50) (53) (55)
Net loss amortization 232 180 119
Termination benefits 19 44 23
Curtailments 10 3 5
Settlements 5 0 0
Net periodic benefit cost (credit) 123 78 (1)
International | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 238 252 238
Interest cost 178 172 204
Expected return on plan assets (431) (393) (382)
Amortization of unrecognized prior service cost (13) (11) (11)
Net loss amortization 84 98 87
Termination benefits 2 4 4
Curtailments 1 (4) (1)
Settlements 13 5 6
Net periodic benefit cost (credit) $ 72 $ 123 $ 145