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Pension and Other Postretirement Benefit Plans - Net Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Other Postretirement Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 10 $ 8
Interest cost 16 14
Expected return on plan assets (14) (20)
Amortization of unrecognized prior service credit (10) (11)
Net loss amortization (10) (12)
Net periodic benefit cost (8) (21)
U.S. | Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 89 86
Interest cost 141 134
Expected return on plan assets (210) (207)
Amortization of unrecognized prior service credit 0 0
Net loss amortization 13 10
Termination benefits 0 3
Net periodic benefit cost 33 26
International | Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 54 61
Interest cost 71 74
Expected return on plan assets (143) (139)
Amortization of unrecognized prior service credit (4) (3)
Net loss amortization 3 1
Termination benefits 0 0
Net periodic benefit cost $ (19) $ (6)