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Pension and Other Postretirement Benefit Plans - Net Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Other Postretirement Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 8 $ 12
Interest cost 16 11
Expected return on plan assets (16) (21)
Amortization of unrecognized prior service credit (12) (14)
Net (gain) loss amortization (11) (11)
Net periodic benefit cost (15) (23)
U.S. | Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 76 99
Interest cost 133 103
Expected return on plan assets (187) (196)
Amortization of unrecognized prior service credit 0 (8)
Net (gain) loss amortization 0 56
Curtailments 2 3
Settlements 21 1
Net periodic benefit cost 45 58
International | Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 49 75
Interest cost 74 38
Expected return on plan assets (128) (101)
Amortization of unrecognized prior service credit (3) (4)
Net (gain) loss amortization (1) 25
Curtailments 0 0
Settlements 0 0
Net periodic benefit cost $ (9) $ 33