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Borrowings and Other Financing Instruments, Credit Facility (Details) - Credit Facility - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Line of Credit Facility [Line Items]    
Credit Facility [1] $ 150,000,000  
Drawn [2] 0  
Available 150,000,000  
Direct advances on the credit facility outstanding $ 0 $ 0
[1] This credit facility expires in October 2019.
[2] Includes outstanding commercial paper.