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v2.4.1.9

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 | $ 0.30875 us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit |  |  |  |
Threshold for Per Unit Incentive Distributions | $ 0.330625 oge_ThresholdforPerUnitIncentiveDistributions |  |  |  |
Incentive Distribution Percentage Level | 50.00%oge_IncentiveDistributionPercentageLevel |  |  |  |
Equity in earnings of unconsolidated affiliates | $ 31.7 us-gaap_IncomeLossFromEquityMethodInvestments | $ 47.9 us-gaap_IncomeLossFromEquityMethodInvestments |  |  |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | 1,000.0 us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity |  |  |  |
Subsequent Event [Member] |  |  |  |  |
Distribution Made to Limited Partner, Distributions Declared, Per Unit |  |  | $ 0.31250 us-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 | 2,200.0 oge_IncreaseinFairValueofNetAssets / dei_LegalEntityAxis = oge_EnogexLlcMember |  |  |  |
Enable Midstream Partners [Member] |  |  |  |  |
Partners' Capital Account, Units, Sold in Public Offering |  |  |  | 25,000,000 us-gaap_PartnersCapitalAccountUnitsSoldInPublicOffering / dei_LegalEntityAxis = oge_EnableMidstreamPartnersMember |
Distributions from unconsolidated affiliates | $ 34.3 us-gaap_EquityMethodInvestmentDividendsOrDistributions / dei_LegalEntityAxis = oge_EnableMidstreamPartnersMember | $ 32.5 us-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. | 42,832,291 oge_CommonUnitsHeldbyLimitedPartnersoftheLLCorLP. / dei_LegalEntityAxis = oge_OgeHoldingsMember |  |  |  |
Subordinated Units Held by Limited Partners of the LLC or LP. | 68,150,514 oge_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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- Definition Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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