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Rate Matters and Regulation Rate Matters and Regulation (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Mar. 31, 2015
Regional Haze [Member]      
Estimated Environmental Capital Costs     $ 1,100.0oge_EstimatedEnvironmentalCapitalCosts
/ oge_EnvironmentalComplianceAxis
= oge_RegionalHazeMember
SmartHours Program [Member]      
Lost Revenue Associated with Customer Programs 11.6oge_LostRevenueAssociatedwithCustomerPrograms
/ us-gaap_PublicUtilitiesRegulatoryProceedingAxis
= oge_SmartHoursProgramMember		 10.1oge_LostRevenueAssociatedwithCustomerPrograms
/ us-gaap_PublicUtilitiesRegulatoryProceedingAxis
= oge_SmartHoursProgramMember		  
Oklahoma Public Utility Division Staff [Member] | SmartHours Program [Member]      
Lost Revenue Associated with Customer Programs   4.9oge_LostRevenueAssociatedwithCustomerPrograms
/ oge_CommissionRecommendationAxis
= oge_OklahomaPublicUtilityDivisionStaffMember
/ us-gaap_PublicUtilitiesRegulatoryProceedingAxis
= oge_SmartHoursProgramMember		  
Reduction of Revenue   $ 5.2oge_ReductionofRevenue
/ oge_CommissionRecommendationAxis
= oge_OklahomaPublicUtilityDivisionStaffMember
/ us-gaap_PublicUtilitiesRegulatoryProceedingAxis
= oge_SmartHoursProgramMember