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Borrowings and Other Financing Instruments - Credit Facility (Details)
3 Months Ended
Mar. 31, 2024
USD ($)
Plan
Dec. 31, 2023
USD ($)
Line of Credit Facility [Line Items]    
Number of extension you can request | Plan 2  
Credit Facility    
Line of Credit Facility [Line Items]    
Credit Facility [1] $ 500,000,000  
Outstanding [2] 145,000,000  
Available 355,000,000  
Direct advances on the credit facility outstanding $ 0 $ 0
[1] Expires in September 2027
[2] Includes outstanding letters of credit.