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Borrowings and Other Financing Instruments, Credit Facility (Details) - USD ($)
Jun. 30, 2023
Dec. 31, 2022
Payable to Affiliates    
Line of Credit Facility [Line Items]    
Notes Payable, Current $ 0 $ 0
Credit Facility    
Line of Credit Facility [Line Items]    
Credit Facility [1] 150,000,000  
Outstanding [2] 0  
Available 150,000,000  
Direct advances on the credit facility outstanding $ 0 $ 0
[1] Expires in September 2027.
[2] Includes outstanding commercial paper.