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v2.4.1.9

Investment in Unconsolidated Affiliate and Related Party Transactions (Details) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended | 8 Months Ended | 1 Months Ended | 3 Months Ended | 7 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2014 | Apr. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | May 30, 2014 | Mar. 31, 2014 | Dec. 31, 2014 | May 01, 2013 | May 13, 2014
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest |  | 6.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest |  |  |  |  |  |  |
Partners' Capital Account, Units, Acquisitions | 6,322,457 us-gaap_PartnersCapitalAccountUnitsAcquisitions |  |  |  |  |  |  |  |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity |  |  | $ 1,000.0 us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity |  |  |  | 1,000.0 us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity |  |
Enable Midstream Partners [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Partners' Capital Account, Units, Sold in Public Offering |  | 25,000,000 us-gaap_PartnersCapitalAccountUnitsSoldInPublicOffering / dei_LegalEntityAxis = oge_EnableMidstreamPartnersMember |  |  |  |  |  |  |
Proceeds from Issuance Initial Public Offering |  | 464.0 us-gaap_ProceedsFromIssuanceInitialPublicOffering / dei_LegalEntityAxis = oge_EnableMidstreamPartnersMember |  |  |  |  |  |  |
Distributions received |  |  | 143.7 us-gaap_EquityMethodInvestmentDividendsOrDistributions / dei_LegalEntityAxis = oge_EnableMidstreamPartnersMember |  |  |  |  |  |
Enogex LLC [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
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 |  |  |  |  |
Southeast Supply Header, LLC [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Percentage of Subsidiary Contributed |  |  |  |  |  |  |  |  | 24.95%oge_PercentageOfSubsidiaryContributed / dei_LegalEntityAxis = oge_SoutheastSupplyHeaderLlcMember
ArcLight group [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Contributions to Pay Down Short-Term Debt |  |  |  |  |  |  |  | 107.0 oge_ContributionsToPayDownShortTermDebt / dei_LegalEntityAxis = oge_ArclightGroupMember |
Partners' Capital Account, Units, Sold in Public Offering |  | 3,750,000 us-gaap_PartnersCapitalAccountUnitsSoldInPublicOffering / dei_LegalEntityAxis = oge_ArclightGroupMember |  |  |  |  |  |  |
OGE Holdings [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Contributions to Pay Down Short-Term Debt |  |  |  |  |  |  |  | 9.1 oge_ContributionsToPayDownShortTermDebt / dei_LegalEntityAxis = oge_OgeHoldingsMember |
OGE Energy [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Percentage Share of Management Rights |  |  | 50.00%oge_PercentageShareOfManagementRights / dei_LegalEntityAxis = oge_OgeEnergyMember |  |  |  | 50.00%oge_PercentageShareOfManagementRights / dei_LegalEntityAxis = oge_OgeEnergyMember |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest |  |  |  |  | 26.70%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest / dei_LegalEntityAxis = oge_OgeEnergyMember | 28.50%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest / dei_LegalEntityAxis = oge_OgeEnergyMember | 26.30%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest / dei_LegalEntityAxis = oge_OgeEnergyMember |  |
Percent of Incentive Distribution Rights |  |  | 60.00%oge_PercentOfIncentiveDistributionRights / dei_LegalEntityAxis = oge_OgeEnergyMember |  |  |  | 60.00%oge_PercentOfIncentiveDistributionRights / dei_LegalEntityAxis = oge_OgeEnergyMember |  |
CenterPoint [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Percentage Share of Management Rights |  |  | 50.00%oge_PercentageShareOfManagementRights / dei_LegalEntityAxis = oge_CenterpointMember |  |  |  | 50.00%oge_PercentageShareOfManagementRights / dei_LegalEntityAxis = oge_CenterpointMember |  |
Percent of Incentive Distribution Rights |  |  | 40.00%oge_PercentOfIncentiveDistributionRights / dei_LegalEntityAxis = oge_CenterpointMember |  |  |  | 40.00%oge_PercentOfIncentiveDistributionRights / dei_LegalEntityAxis = oge_CenterpointMember |  |

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