v3.26.1
Borrowings and Other Financing Instruments - Credit Facility (Details)
6 Months Ended
Jun. 30, 2026
USD ($)
Plan
Dec. 31, 2025
USD ($)
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] $ 600,000,000  
Outstanding [2] 45,000,000  
Available 555,000,000  
Direct advances on the credit facility outstanding $ 0 $ 0
[1] Expires in December 2029
[2] Includes outstanding commercial paper and letters of credit.