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Borrowings and Other Financing Instruments - Credit Facility (Details)
9 Months Ended
Sep. 30, 2025
USD ($)
Plan
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Line of Credit Facility [Line Items]      
Number of extension you can request | Plan 2    
Credit Facility      
Line of Credit Facility [Line Items]      
Credit Facility $ 600,000,000 [1] $ 500,000,000  
Outstanding [2] 0    
Available 600,000,000    
Direct advances on the credit facility outstanding $ 0   $ 0
[1] Expires in December 2029
[2] Includes outstanding letters of credit.