XML 62 R38.htm IDEA: XBRL DOCUMENT v3.3.0.814
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] $ 400,000,000  
Drawn [2] 10,000,000  
Available 390,000,000  
Direct advances on the credit facility outstanding $ 0 $ 0
[1] This credit facility expires in October 2019.
[2] Includes outstanding commercial paper and letters of credit.