v3.26.3
Pension Plans and Other Postretirement Benefit Plans - Additional Information (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Defined Benefit Plan Disclosure [Line Items]    
Payment for pension benefits $ 10 $ 10
Percentage of service related net periodic benefit costs capitalized to utility property 50.00%  
Percentage of service related net periodic benefit costs recorded to operating expenses 50.00%  
Percentage of non-service related net periodic benefit costs capitalized to regulatory assets 50.00%  
Percentage of non-service related net periodic benefit costs recorded to other expense 50.00%