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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 48 $ 57 $ 57
Interest cost 69 69 81
Expected return on plan assets (72) (83) (78)
Amortization of unrecognized prior service cost (78) (84) (98)
Net loss amortization (10) 1 1
Termination benefits 5 3 8
Curtailments (11) (8) (31)
Settlements 0 0 0
Net periodic benefit cost (credit) (49) (45) (60)
United States | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 293 326 312
Interest cost 458 432 454
Expected return on plan assets (817) (851) (862)
Amortization of unrecognized prior service cost (49) (50) (53)
Net loss amortization 151 232 180
Termination benefits 31 19 44
Curtailments 14 10 3
Settlements 0 5 0
Net periodic benefit cost (credit) 81 123 78
International | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 238 238 252
Interest cost 177 178 172
Expected return on plan assets (426) (431) (393)
Amortization of unrecognized prior service cost (12) (13) (11)
Net loss amortization 64 84 98
Termination benefits 8 2 4
Curtailments 6 1 (4)
Settlements 1 13 5
Net periodic benefit cost (credit) $ 56 $ 72 $ 123