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Employee Benefits - Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension Benefits        
Net Periodic Benefit Cost        
Net Periodic Other Benefit Costs $ 148 $ 137 $ 420 $ 412
Special termination benefits 26   26  
Pension Benefits | United States        
Net Periodic Benefit Cost        
Service cost 92 90 271 268
Interest cost 132 116 379 348
Expected return on plan assets (197) (149) (544) (447)
Amortization of prior service costs (credits) 1 1 3 3
Amortization of actuarial losses (gains) 38 60 98 182
Curtailment losses (gains) 56 0 127 0
Net Periodic Other Benefit Costs 122 118 334 354
Pension Benefits | International        
Net Periodic Benefit Cost        
Service cost 13 14 42 41
Interest cost 55 48 151 143
Expected return on plan assets (53) (51) (148) (148)
Amortization of prior service costs (credits) 2 3 8 8
Amortization of actuarial losses (gains) 9 5 33 14
Net Periodic Other Benefit Costs 26 19 86 58
Other Benefits        
Net Periodic Benefit Cost        
Service cost 7 8 22 25
Interest cost 25 24 75 74
Amortization of prior service costs (credits) (6) (7) (17) (19)
Amortization of actuarial losses (gains) (4) (4) (13) (11)
Curtailment losses (gains) (1) 0 (1) 0
Net Periodic Other Benefit Costs $ 21 $ 21 $ 66 $ 69