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Borrowings and Other Financing Instruments, Credit Facility (Details) (Credit Facility, USD $)
Mar. 31, 2015
Credit Facility
 
Line of Credit Facility [Line Items]  
Credit Facility $ 700,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
[1]
Drawn 149,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
[2]
Available 551,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Direct advances on the credit facility outstanding $ 0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
[1] This credit facility expires in October 2019.
[2] Includes outstanding commercial paper and letters of credit.