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	$ 0.01
Common Stock, Shares Authorized	450us-gaap_CommonStockSharesAuthorized	450us-gaap_CommonStockSharesAuthorized
Common Stock, Shares, Outstanding	199.4us-gaap_CommonStockSharesOutstanding	198.5us-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%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum	0.07%
Debentures Subject to Mandatory Redemption [Member] \| Muskogee Industrial Authority, Janaury 1, 2025 [Member]
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum	0.18%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum	0.07%
Debentures Subject to Mandatory Redemption [Member] \| Muskogee Industrial Authority, June 1, 2027 [Member]
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum	0.15%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum	0.04%

Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Maximum contractual interest rate for funds borrowed, under the debt agreement.

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Minimum contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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