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Pension and Other Postretirement Benefit Plans - Net Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Other Postretirement Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 12 $ 13
Interest cost 11 11
Expected return on plan assets (21) (20)
Amortization of unrecognized prior service credit (25) (25)
Net periodic benefit cost (23) (21)
U.S. | Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 99 100
Interest cost 103 96
Expected return on plan assets (196) (188)
Amortization of unrecognized prior service credit (8) (10)
Net loss amortization 56 85
Termination benefits 0 1
Curtailments 3 7
Settlements 1 0
Net periodic benefit cost 58 91
International | Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 75 92
Interest cost 38 29
Expected return on plan assets (101) (104)
Amortization of unrecognized prior service credit (4) (4)
Net loss amortization 25 41
Termination benefits 0 0
Curtailments 0 0
Settlements 0 0
Net periodic benefit cost $ 33 $ 54