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Short-Term Debt and Credit Facilities (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Line of Credit Facility [Line Items]    
Short-term debt $ 109.9us-gaap_ShortTermBorrowings $ 98.0us-gaap_ShortTermBorrowings
Line of Credit Facility [Abstract]    
Aggregate Commitment 1,150.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity  
Amount Outstanding 111.8us-gaap_LineOfCredit [1]  
Weighted Average Interest Rate 0.55%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 109.9us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 [1],[2]  
Weighted Average Interest Rate 0.54%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 [2],[3]  
Maturity Dec. 13, 2018  
OG&E [Member]    
Line of Credit Facility [Abstract]    
Aggregate Commitment 400.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= oge_OgAndEMember		 [4]  
Letters of Credit Outstanding, Amount 1.9us-gaap_LettersOfCreditOutstandingAmount
/ dei_LegalEntityAxis
= oge_OgAndEMember		 [1],[4]  
Weighted Average Interest Rate 0.95%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= oge_OgAndEMember		 [3],[4]  
Maturity Dec. 13, 2018  
Short Term Borrowing Capacity That Has Regulatory Approval $ 800.0oge_ShortTermBorrowingCapacityThatHasRegulatoryApproval
/ dei_LegalEntityAxis
= oge_OgAndEMember		  
Period For Which Regulatory Approval Has Been Given to Acquire Short Term Debt 2 years  
[1] Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at March 31, 2015.
[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] 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.