v3.26.1
Securitization - Narrative (Details) - USD ($)
$ in Thousands
 1 Months Ended
Mar. 31, 2023
Mar. 31, 2026
Sep. 30, 2025
Jun. 30, 2023
Variable Interest Entity [Line Items]        
Long-term debt, fair value   $ 8,642,130 $ 8,272,978  
Variable Interest Entity, Primary Beneficiary | Texas | Extraordinary Gas Cost | Winter Storm Uri        
Variable Interest Entity [Line Items]        
Regulatory asset, authorized $ 3,500,000      
Variable Interest Entity, Primary Beneficiary | Texas | Extraordinary Gas Cost | Winter Storm Uri | Minimum        
Variable Interest Entity [Line Items]        
Regulatory asset, maturity period (in years) 12 years      
Variable Interest Entity, Primary Beneficiary | Texas | Extraordinary Gas Cost | Winter Storm Uri | Maximum        
Variable Interest Entity [Line Items]        
Regulatory asset, maturity period (in years) 18 years      
Securitized Utility Tariff Bonds | Senior Notes | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Debt face amount       $ 95,000
Long-term debt   72,600 77,000  
Long-term debt, fair value   $ 73,300 $ 78,800