v3.25.4
Postretirement Benefits Other Than Pensions - Actuarial Assumptions of OPEB Expense (Details)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]      
Effective Rate for Interest on Service Cost 5.50% 4.85% 5.04%
Other Postretirement Benefit Plan, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Weighted-average Discount Rate 5.54% 4.92% 5.11%
Service Cost Discount Rate 5.61% 4.94% 5.12%
Interest Cost Discount Rate 5.21% 4.85% 5.03%
Rate of Increase in Future Compensation Levels 2.20% 2.20% 2.20%