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Investment in Unconsolidated Affiliates Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Related Party Transaction [Line Items]
Accounts receivable - unconsolidated affiliates	$ 6.6us-gaap_AccountsReceivableRelatedPartiesCurrent		$ 5.6us-gaap_AccountsReceivableRelatedPartiesCurrent
Enable Midstream Partners [Member] | OG&E [Member]
Related Party Transaction [Line Items]
Electricity to power electric compression assets	3.1us-gaap_RevenueFromRelatedParties / dei_LegalEntityAxis = oge_OgAndEMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = oge_EnableMidstreamPartnersMember	2.9us-gaap_RevenueFromRelatedParties / dei_LegalEntityAxis = oge_OgAndEMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = oge_EnableMidstreamPartnersMember
Operating Costs Charged [Member] | Enable Midstream Partners [Member] | OG&E [Member]
Related Party Transaction [Line Items]
Operating expenses	2.8us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = oge_OperatingCostsChargedMember / dei_LegalEntityAxis = oge_OgAndEMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = oge_EnableMidstreamPartnersMember	6.0us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = oge_OperatingCostsChargedMember / dei_LegalEntityAxis = oge_OgAndEMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = oge_EnableMidstreamPartnersMember
Employment Costs [Member] | Enable Midstream Partners [Member] | OG&E [Member]
Related Party Transaction [Line Items]
Operating expenses	10.0us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = oge_EmploymentCostsMember / dei_LegalEntityAxis = oge_OgAndEMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = oge_EnableMidstreamPartnersMember	28.4us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = oge_EmploymentCostsMember / dei_LegalEntityAxis = oge_OgAndEMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = oge_EnableMidstreamPartnersMember
Natural Gas Transportation [Member] | Enable Midstream Partners [Member] | OG&E [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Purchases from Related Party	8.8us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = oge_NaturalGasTransportationMember / dei_LegalEntityAxis = oge_OgAndEMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = oge_EnableMidstreamPartnersMember	8.7us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = oge_NaturalGasTransportationMember / dei_LegalEntityAxis = oge_OgAndEMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = oge_EnableMidstreamPartnersMember
Natural Gas Storage [Member] | Enable Midstream Partners [Member] | OG&E [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Purchases from Related Party	0us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = oge_NaturalGasStorageMember / dei_LegalEntityAxis = oge_OgAndEMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = oge_EnableMidstreamPartnersMember	3.3us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = oge_NaturalGasStorageMember / dei_LegalEntityAxis = oge_OgAndEMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = oge_EnableMidstreamPartnersMember
Natural Gas Purchases [Member] | Enable Midstream Partners [Member] | OG&E [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Purchases from Related Party	$ 2.5us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = oge_NaturalGasPurchasesMember / dei_LegalEntityAxis = oge_OgAndEMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = oge_EnableMidstreamPartnersMember	$ 5.0us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = oge_NaturalGasPurchasesMember / dei_LegalEntityAxis = oge_OgAndEMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = oge_EnableMidstreamPartnersMember

X

- Definition

Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(k)(1))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Subparagraph a

-Article 5



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph k

-Subparagraph 1

-Article 4



Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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X

- Definition

Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

No definition available.

+ Details

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X

- Definition

Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party.

+ References

No definition available.

+ Details

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X

- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(e))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Related Parties

-URI http://asc.fasb.org/extlink&oid=16382449



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.6-07.1(c))

-URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 07

-Paragraph b

-Subparagraph 1

-Article 6

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- Details

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- Details

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- Details

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