v3.25.4
Pension and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 37 $ 30 $ 32
Interest cost 61 56 63
Expected return on plan assets (50) (80) (64)
Amortization of unrecognized prior service (credit) cost (40) (43) (49)
Net loss (gain) amortization (45) (51) (42)
Termination benefits 0 4 0
Curtailments (3) 0 (1)
Settlements 0 0 0
Net periodic benefit cost (credit) (40) (84) (61)
United States | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 378 373 326
Interest cost 569 537 526
Expected return on plan assets (840) (826) (735)
Amortization of unrecognized prior service (credit) cost 0 0 (1)
Net loss (gain) amortization 58 43 0
Termination benefits 2 5 3
Curtailments 9 0 8
Settlements 0 0 28
Net periodic benefit cost (credit) 176 132 155
International | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 228 243 196
Interest cost 303 294 299
Expected return on plan assets (613) (554) (517)
Amortization of unrecognized prior service (credit) cost (28) (13) 2
Net loss (gain) amortization 11 5 (3)
Termination benefits 0 1 0
Curtailments (15) 0 (1)
Settlements 0 (1) (5)
Net periodic benefit cost (credit) $ (114) $ (25) $ (29)