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STATEMENTS OF CAPITALIZATION (Parenthetical) (USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Common Stock, Par or Stated Value Per Share 2.50us-gaap_CommonStockParOrStatedValuePerShare $ 2.50us-gaap_CommonStockParOrStatedValuePerShare
Common Stock, Shares Authorized 100.0us-gaap_CommonStockSharesAuthorized 100.0us-gaap_CommonStockSharesAuthorized
Common Stock, Shares, Outstanding 40.4us-gaap_CommonStockSharesOutstanding 40.4us-gaap_CommonStockSharesOutstanding
Garfield Industrial Authority Bond, Due January 1, 2025 [Member]    
Debt Instrument, Maturity Date Jan. 01, 2025  
Garfield Industrial Authority Bond, Due January 1, 2025 [Member] | Debentures Subject to Mandatory Redemption [Member]    
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum 0.07%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= ogec_GarfieldIndustrialAuthorityBondMember
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= us-gaap_DebenturesSubjectToMandatoryRedemptionMember		  
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum 0.20%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= ogec_GarfieldIndustrialAuthorityBondMember
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= us-gaap_DebenturesSubjectToMandatoryRedemptionMember		  
Muskogee Industrial Authority Bond, Due January 1, 2025 [Member]    
Debt Instrument, Maturity Date Jan. 01, 2025  
Muskogee Industrial Authority Bond, Due January 1, 2025 [Member] | Debentures Subject to Mandatory Redemption [Member]    
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum 0.07%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= ogec_MuskogeeIndustrialAuthorityBondDue2025Member
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= us-gaap_DebenturesSubjectToMandatoryRedemptionMember		  
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum 0.18%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= ogec_MuskogeeIndustrialAuthorityBondDue2025Member
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= us-gaap_DebenturesSubjectToMandatoryRedemptionMember		  
Muskogee Industrial Authority Bond, Due June 1, 2027 [Member]    
Debt Instrument, Maturity Date Jun. 01, 2027  
Muskogee Industrial Authority Bond, Due June 1, 2027 [Member] | Debentures Subject to Mandatory Redemption [Member]    
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum 0.04%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= ogec_MuskogeeIndustrialAuthorityBondDue2027Member
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= us-gaap_DebenturesSubjectToMandatoryRedemptionMember		  
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum 0.15%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= ogec_MuskogeeIndustrialAuthorityBondDue2027Member
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= us-gaap_DebenturesSubjectToMandatoryRedemptionMember		  
Senior Notes [Member] | OG&E [Member] | Series Due January 15, 2016 [Member]    
Debt Instrument, Maturity Date Jan. 15, 2016  
Senior Notes [Member] | OG&E [Member] | Series Due July 15, 2017 [Member]    
Debt Instrument, Maturity Date Jul. 15, 2017  
Senior Notes [Member] | OG&E [Member] | Series Due September 1, 2018 [Member]    
Debt Instrument, Maturity Date Sep. 01, 2018  
Senior Notes [Member] | OG&E [Member] | Series Due January 15, 2019 [Member]    
Debt Instrument, Maturity Date Jan. 15, 2019  
Senior Notes [Member] | OG&E [Member] | Series Due July 15, 2027 [Member]    
Debt Instrument, Maturity Date Jul. 15, 2027  
Senior Notes [Member] | OG&E [Member] | Series Due April 15, 2028 [Member]    
Debt Instrument, Maturity Date Apr. 15, 2028  
Senior Notes [Member] | OG&E [Member] | Series Due August 1, 2034 [Member]    
Debt Instrument, Maturity Date Aug. 01, 2034  
Senior Notes [Member] | OG&E [Member] | Series Due January 15, 2036 [Member]    
Debt Instrument, Maturity Date Jan. 15, 2036  
Senior Notes [Member] | OG&E [Member] | Series Due February 1, 2038 [Member]    
Debt Instrument, Maturity Date Feb. 01, 2038  
Senior Notes [Member] | OG&E [Member] | Series Due June 1, 2040 [Member]    
Debt Instrument, Maturity Date Jun. 01, 2040  
Senior Notes [Member] | OG&E [Member] | Senior Notes due May 15, 2041 [Member]    
Debt Instrument, Maturity Date May 15, 2041  
Senior Notes [Member] | OG&E [Member] | Series due May 1, 2043 [Member]    
Debt Instrument, Maturity Date May 01, 2043  
Senior Notes [Member] | OG&E [Member] | Series due March 15, 2044 [Member]    
Debt Instrument, Maturity Date Mar. 15, 2044  
Senior Notes [Member] | OG&E [Member] | Series due December 15, 2044 [Member]    
Debt Instrument, Maturity Date Dec. 15, 2044  
Long-term Debt [Member] | OG&E [Member] | Due August 31, 2062 [Member]    
Debt Instrument, Maturity Date Aug. 31, 2062