v3.25.2
Borrowings and Other Financing Instruments - Credit Facility (Details)
6 Months Ended
Jun. 30, 2025
USD ($)
Plan
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Line of Credit Facility [Line Items]      
Term of letters of credit (in years) 1 year    
Number of extension you can request | Plan 2    
Credit Facility      
Line of Credit Facility [Line Items]      
Credit Facility [1] $ 1,200,000,000 $ 700,000,000  
Drawn [2] 30,000,000    
Available 1,170,000,000    
Direct advances on the credit facility outstanding $ 0   $ 0
[1] Expires in December 2029.
[2] Includes outstanding commercial paper and letters of credit.