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Borrowings and Other Financing Instruments, Credit Facility (Details) (USD $)
Dec. 31, 2013
Sep. 30, 2014
Credit Facility
Line of Credit Facility [Line Items]    
Credit Facility   $ 700,000,000 [1]
Drawn   259,500,000 [2]
Available   440,500,000
Direct advances on the credit facility outstanding $ 0 $ 0
[1] Credit facility has been amended to expire in October 2019.
[2] Includes outstanding commercial paper and letters of credit.