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Commitments and Contingencies (Details) (New Source Review [Member], USD $)
Mar. 31, 2015
New Source Review [Member]
  
Long-term Purchase Commitment [Line Items]  
Estimated Environmental Capital Costs $ 1,100,000,000oge_EstimatedEnvironmentalCapitalCosts
/ oge_EnvironmentalComplianceAxis
= oge_NewSourceReviewMember
Potential Penalty Under the Federal Clean Air Act $ 37,500oge_PotentialPenaltyUnderFederalCleanAirAct
/ oge_EnvironmentalComplianceAxis
= oge_NewSourceReviewMember