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Borrowings and Other Financing Instruments - Credit Facility (Details)
9 Months Ended
Sep. 30, 2020
USD ($)
Plan
Dec. 31, 2019
USD ($)
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] $ 700,000,000  
Drawn [2] 8,000,000  
Available 692,000,000  
Direct advances on the credit facility outstanding $ 0 $ 0
[1] Expires in June 2024.
[2] Includes outstanding commercial paper and letters of credit.