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Pension and Other Postretirement Benefit Plans - Schedule of Net Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Other Postretirement Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 9 $ 7 $ 29 $ 23
Interest cost 15 14 46 42
Expected return on plan assets (13) (20) (39) (60)
Amortization of unrecognized prior service credit (10) (11) (30) (32)
Net (gain) loss amortization (12) (14) (33) (38)
Net periodic benefit cost (11) (24) (27) (65)
U.S. | Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 100 100 279 273
Interest cost 143 134 425 403
Expected return on plan assets (210) (206) (630) (621)
Amortization of unrecognized prior service credit 0 0 0 0
Net (gain) loss amortization 16 12 42 30
Termination benefits 0 1 1 5
Curtailments 9 0 8 0
Net periodic benefit cost 58 41 125 90
International | Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 57 60 171 182
Interest cost 78 74 225 220
Expected return on plan assets (159) (139) (454) (416)
Amortization of unrecognized prior service credit (4) (3) (12) (10)
Net (gain) loss amortization 3 1 8 4
Termination benefits 0 0 0 0
Curtailments (16) 0 (16) 0
Net periodic benefit cost $ (41) $ (7) $ (78) $ (20)