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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 52 $ 48 $ 57
Interest cost 57 69 69
Expected return on plan assets (75) (72) (83)
Amortization of unrecognized prior service cost (73) (78) (84)
Net loss (gain) amortization (18) (10) 1
Termination benefits 2 5 3
Curtailments (4) (11) (8)
Settlements 0 0 0
Net periodic benefit cost (credit) (59) (49) (45)
United States | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 360 293 326
Interest cost 431 458 432
Expected return on plan assets (774) (817) (851)
Amortization of unrecognized prior service cost (49) (49) (50)
Net loss (gain) amortization 303 151 232
Termination benefits 10 31 19
Curtailments 10 14 10
Settlements 13 0 5
Net periodic benefit cost (credit) 304 81 123
International | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 301 238 238
Interest cost 137 177 178
Expected return on plan assets (415) (426) (431)
Amortization of unrecognized prior service cost (18) (12) (13)
Net loss (gain) amortization 127 64 84
Termination benefits 3 8 2
Curtailments 0 6 1
Settlements 15 1 13
Net periodic benefit cost (credit) $ 150 $ 56 $ 72