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Pension and Other Postretirement Benefit Plans - Net Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Other Postretirement Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 7 $ 8 $ 23 $ 24
Interest cost 14 16 42 47
Expected return on plan assets (20) (16) (60) (48)
Amortization of unrecognized prior service (credit) cost (11) (12) (32) (37)
Net loss (gain) amortization (14) (11) (38) (31)
Curtailments 0 0 0 (1)
Net periodic benefit cost (24) (15) (65) (46)
U.S. | Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 100 88 273 239
Interest cost 134 130 403 396
Expected return on plan assets (206) (182) (621) (553)
Amortization of unrecognized prior service (credit) cost 0 0 0 (1)
Net loss (gain) amortization 12 0 30 0
Termination benefits 1 1 5 2
Curtailments 0 0 0 5
Settlements 0 0 0 26
Net periodic benefit cost 41 37 90 114
International | Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 60 48 182 148
Interest cost 74 76 220 225
Expected return on plan assets (139) (131) (416) (390)
Amortization of unrecognized prior service (credit) cost (3) (6) (10) 5
Net loss (gain) amortization 1 (1) 4 (2)
Termination benefits 0 0 0 0
Curtailments 0 0 0 0
Settlements 0 0 0 0
Net periodic benefit cost $ (7) $ (14) $ (20) $ (14)