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Borrowings and Other Financing Instruments, Credit Facility (Details) - Credit Facility
Sep. 30, 2015
USD ($)
Line of Credit Facility [Line Items]  
Credit Facility $ 700,000,000 [1]
Drawn 5,000,000 [2]
Available 695,000,000
Direct advances on the credit facility outstanding $ 0
[1] This credit facility expires in October 2019.
[2] Includes outstanding commercial paper and letters of credit.