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CONSOLIDATED 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 | 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare
Common Stock, Shares Authorized | 450 us-gaap_CommonStockSharesAuthorized | 450 us-gaap_CommonStockSharesAuthorized
Common Stock, Shares, Outstanding | 199.4 us-gaap_CommonStockSharesOutstanding | 198.5 us-gaap_CommonStockSharesOutstanding
Garfield Industrial Authority, January 1, 2025 [Member] |  |
Debt Instrument, Maturity Date | Jan. 01, 2025 |
Muskogee Industrial Authority, Janaury 1, 2025 [Member] |  |
Debt Instrument, Maturity Date | Jan. 01, 2025 |
Muskogee Industrial Authority, June 1, 2027 [Member] |  |
Debt Instrument, Maturity Date | Jun. 01, 2027 |
Senior Notes [Member] | Series Due November 15, 2014 [Member] | OGE Energy [Member] |  |
Debt Instrument, Maturity Date | Nov. 15, 2014 |
Senior Notes [Member] | Series Due November 24, 2017 [Member] | OGE Energy [Member] |  |
Debt Instrument, Maturity Date | Nov. 24, 2017 |
Senior Notes [Member] | Series Due January 15, 2016 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | Jan. 15, 2016 |
Senior Notes [Member] | Series Due July 15, 2017 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | Jul. 15, 2017 |
Senior Notes [Member] | Series Due September 1, 2018 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | Sep. 01, 2018 |
Senior Notes [Member] | Series Due January 15, 2019 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | Jan. 15, 2019 |
Senior Notes [Member] | Series Due July 15, 2027 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | Jul. 15, 2027 |
Senior Notes [Member] | Series Due April 15, 2028 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | Apr. 15, 2028 |
Senior Notes [Member] | Series Due August 1, 2034 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | Aug. 01, 2034 |
Senior Notes [Member] | Series Due January 15, 2036 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | Jan. 15, 2036 |
Senior Notes [Member] | Series Due February 1, 2038 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | Feb. 01, 2038 |
Senior Notes [Member] | Series Due June 1, 2040 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | Jun. 01, 2040 |
Senior Notes [Member] | Senior Notes due May 15, 2041 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | May 15, 2041 |
Senior Notes [Member] | Due August 31, 2062 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | May 01, 2043 |
Senior Notes [Member] | Series due December 15, 2044 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | Dec. 15, 2044 |
Long-term Debt [Member] | OG and E Tinker Debt [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | Aug. 31, 2062 |
Debentures Subject to Mandatory Redemption [Member] | Garfield Industrial Authority, January 1, 2025 [Member] |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum | 0.20%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_DebtInstrumentAxis = oge_GarfieldIndustrialAuthorityBondMember / us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis = us-gaap_DebenturesSubjectToMandatoryRedemptionMember |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum | 0.07%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_DebtInstrumentAxis = oge_GarfieldIndustrialAuthorityBondMember / us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis = us-gaap_DebenturesSubjectToMandatoryRedemptionMember |
Debentures Subject to Mandatory Redemption [Member] | Muskogee Industrial Authority, Janaury 1, 2025 [Member] |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum | 0.18%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_DebtInstrumentAxis = oge_MuskogeeIndustrialAuthorityBondDue2025Member / us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis = us-gaap_DebenturesSubjectToMandatoryRedemptionMember |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum | 0.07%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_DebtInstrumentAxis = oge_MuskogeeIndustrialAuthorityBondDue2025Member / us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis = us-gaap_DebenturesSubjectToMandatoryRedemptionMember |
Debentures Subject to Mandatory Redemption [Member] | Muskogee Industrial Authority, June 1, 2027 [Member] |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum | 0.15%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_DebtInstrumentAxis = oge_MuskogeeIndustrialAuthorityBondDue2027Member / us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis = us-gaap_DebenturesSubjectToMandatoryRedemptionMember |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum | 0.04%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_DebtInstrumentAxis = oge_MuskogeeIndustrialAuthorityBondDue2027Member / us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis = us-gaap_DebenturesSubjectToMandatoryRedemptionMember |

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