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Short-Term Debt and Credit Facilities (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Line of Credit Facility [Line Items]    
Short-term debt $ 98.0us-gaap_ShortTermBorrowings 439.6us-gaap_ShortTermBorrowings
Line of Credit Facility [Abstract]    
Aggregate Commitment 1,150.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity  
Amount Outstanding 100.0us-gaap_LineOfCredit [1]  
Weighted Average Interest Rate 0.42%us-gaap_ShortTermDebtWeightedAverageInterestRate  
OGE Energy [Member]    
Line of Credit Facility [Abstract]    
Aggregate Commitment 750.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 [2]  
Amount Outstanding 98.0us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 [1],[2]  
Weighted Average Interest Rate 0.41%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 [2],[3] 0.43%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Maturity Dec. 13, 2018 [2],[4]  
OG&E [Member]    
Line of Credit Facility [Abstract]    
Aggregate Commitment 400.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= oge_OgAndEMember		 [5]  
Letters of Credit Outstanding, Amount 2.0us-gaap_LettersOfCreditOutstandingAmount
/ dei_LegalEntityAxis
= oge_OgAndEMember		 [1],[5]  
Weighted Average Interest Rate 0.95%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= oge_OgAndEMember		 [3],[5]  
Maturity Dec. 13, 2018 [4],[5]  
Period For Which Regulatory Approval Has Been Given to Acquire Short Term Debt 2 years  
Short Term Borrowing Capacity That Has Regulatory Approval 800.0oge_ShortTermBorrowingCapacityThatHasRegulatoryApproval
/ dei_LegalEntityAxis
= oge_OgAndEMember		  
December 13, 2017 [Member] | OGE Energy [Member]    
Line of Credit Facility [Abstract]    
Aggregate Commitment 16.3us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= oge_December132017Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
December 13, 2017 [Member] | OG&E [Member]    
Line of Credit Facility [Abstract]    
Aggregate Commitment $ 8.7us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= oge_December132017Member
/ dei_LegalEntityAxis
= oge_OgAndEMember		  
[1] Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at December 31, 2014.
[2] This bank facility is available to back up OGE Energy's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility.
[3] Represents the weighted-average interest rate for the outstanding borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit.
[4] In December 2011, the Company and OG&E entered into unsecured five-year revolving credit agreements to total in the aggregate $1,150.0 million ($750.0 million for the Company and $400.0 million for OG&E). Each of the credit facilities contained an option, which could be exercised up to two times, to extend the term for an additional year. In the third quarter of 2013, the Company and OG&E utilized one of these one-year extensions, and received consent from all of the lenders, to extend the maturity of their credit agreements from December 13, 2016 to December 13, 2017.
[5] This bank facility is available to back up OG&E's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility.