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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 48 $ 52 $ 48
Interest cost 45 57 69
Expected return on plan assets (79) (75) (72)
Amortization of unrecognized prior service cost (63) (73) (78)
Net loss (gain) amortization (42) (18) (10)
Termination benefits 37 2 5
Curtailments (29) (4) (11)
Settlements 0 0 0
Net periodic benefit cost (credit) (83) (59) (49)
United States | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 403 360 293
Interest cost 404 431 458
Expected return on plan assets (755) (774) (817)
Amortization of unrecognized prior service cost (38) (49) (49)
Net loss (gain) amortization 298 303 151
Termination benefits 56 10 31
Curtailments 16 10 14
Settlements 216 13 0
Net periodic benefit cost (credit) 600 304 81
International | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 328 297 235
Interest cost 123 136 176
Expected return on plan assets (416) (414) (425)
Amortization of unrecognized prior service cost (16) (18) (12)
Net loss (gain) amortization 142 127 64
Termination benefits 5 3 8
Curtailments (26) 0 6
Settlements 8 15 1
Net periodic benefit cost (credit) $ 148 $ 146 $ 53