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Borrowings and Other Financing Instruments, Credit Facility (Details) - Credit Facility
3 Months Ended
Mar. 31, 2016
USD ($)
Line of Credit Facility [Line Items]  
Debt Instrument, Maturity Date Oct. 31, 2019
Credit Facility $ 700,000,000 [1]
Drawn 4,000,000 [2]
Available 696,000,000
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.