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Investment in Unconsolidated Affiliates (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended			1 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Jun. 30, 2015	Apr. 30, 2014	May 01, 2013
Distribution Made to Limited Partner, Distributions Declared, Per Unit	$ 0.30875us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit
Threshold for Per Unit Incentive Distributions	$ 0.330625oge_ThresholdforPerUnitIncentiveDistributions
Incentive Distribution Percentage Level	50.00%oge_IncentiveDistributionPercentageLevel
Equity in earnings of unconsolidated affiliates	$ 31.7us-gaap_IncomeLossFromEquityMethodInvestments	$ 47.9us-gaap_IncomeLossFromEquityMethodInvestments
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	1,000.0us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity
Subsequent Event [Member]
Distribution Made to Limited Partner, Distributions Declared, Per Unit			$ 0.31250us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Enogex LLC [Member]
Percentage of Enogex LLC Contributed					100.00%oge_PercentageOfEnogexLlcContributed / dei_LegalEntityAxis = oge_EnogexLlcMember
Increase in fair value of net assets	2,200.0oge_IncreaseinFairValueofNetAssets / dei_LegalEntityAxis = oge_EnogexLlcMember
Enable Midstream Partners [Member]
Partners' Capital Account, Units, Sold in Public Offering				25,000,000us-gaap_PartnersCapitalAccountUnitsSoldInPublicOffering / dei_LegalEntityAxis = oge_EnableMidstreamPartnersMember
Distributions from unconsolidated affiliates	$ 34.3us-gaap_EquityMethodInvestmentDividendsOrDistributions / dei_LegalEntityAxis = oge_EnableMidstreamPartnersMember	$ 32.5us-gaap_EquityMethodInvestmentDividendsOrDistributions / dei_LegalEntityAxis = oge_EnableMidstreamPartnersMember
CenterPoint [Member]
Percent of Subordinated Limited Partner Units	61.40%oge_PercentofSubordinatedLimitedPartnerUnits / dei_LegalEntityAxis = oge_CenterpointMember
OGE Holdings [Member]
Common Units Held by Limited Partners of the LLC or LP.	42,832,291oge_CommonUnitsHeldbyLimitedPartnersoftheLLCorLP. / dei_LegalEntityAxis = oge_OgeHoldingsMember
Subordinated Units Held by Limited Partners of the LLC or LP.	68,150,514oge_SubordinatedUnitsHeldbyLimitedPartnersoftheLLCorLP. / dei_LegalEntityAxis = oge_OgeHoldingsMember
OGE Energy [Member]
Percent of Incentive Distribution Rights	60.00%oge_PercentOfIncentiveDistributionRights / dei_LegalEntityAxis = oge_OgeEnergyMember
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest	26.30%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest / dei_LegalEntityAxis = oge_OgeEnergyMember

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Per unit level at which incentive distributions will be declared and paid to the general partner.

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