v3.25.4
Employee Benefit Plans - Benefit Obligations and Funded Status for Medical Plan (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation at beginning of year $ 1,338 $ 1,466  
Interest cost on projected benefit obligation 68 72 $ 74
Actuarial gain 27 (59)  
Benefits paid (104) (137)  
Projected benefit obligation at end of year 1,329 1,338 1,466
Funded status of the plan 93 54  
Amounts recognized in the balance sheet consist of:      
Current liabilities (5) (5)  
Long-term liabilities (44) (45)  
Net pension asset recognized 93 54  
Postretirement Medical Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation at beginning of year 26 28  
Interest cost on projected benefit obligation 1 1  
Actuarial gain 0 (1)  
Participant contributions 1 1  
Benefits paid (3) (3)  
Projected benefit obligation at end of year 24 26 $ 28
Funded status of the plan (24) (26)  
Amounts recognized in the balance sheet consist of:      
Current liabilities (3) (3)  
Long-term liabilities (22) (23)  
Net pension asset recognized $ (24) $ (26)  
Discount rate assumption as of December 31 5.22% 5.54%