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CONSOLIDATED STATEMENTS OF CAPITALIZATION (Parenthetical) - $ / shares shares in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Common Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01
Common Stock, Shares Authorized | 450.0 | 450.0
Common Stock, Shares, Outstanding | 199.7 | 199.7
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 24, 2017 [Member] | OGE Energy [Member] |  |
Debt Instrument, Maturity Date |  | Nov. 24, 2017
Debt Instrument, Interest Rate, Stated Percentage | 1.87% |
Senior Notes [Member] | Series Due January 15, 2016 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date |  |
Senior Notes [Member] | Series Due July 15, 2017 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | Jul. 15, 2017 |
Debt Instrument, Interest Rate, Stated Percentage | 6.50% |
Senior Notes [Member] | Series Due September 1, 2018 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | Sep. 01, 2018 |
Debt Instrument, Interest Rate, Stated Percentage | 6.35% |
Senior Notes [Member] | Series Due January 15, 2019 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | Jan. 15, 2019 |
Debt Instrument, Interest Rate, Stated Percentage | 8.25% |
Senior Notes [Member] | Series Due July 15, 2027 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | Jul. 15, 2027 |
Debt Instrument, Interest Rate, Stated Percentage | 6.65% |
Senior Notes [Member] | Series Due April 15, 2028 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | Apr. 15, 2028 |
Debt Instrument, Interest Rate, Stated Percentage | 6.50% |
Senior Notes [Member] | Series Due January 15, 2036 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | Jan. 15, 2036 |
Debt Instrument, Interest Rate, Stated Percentage | 5.75% |
Senior Notes [Member] | Series Due February 1, 2038 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | Feb. 01, 2038 |
Debt Instrument, Interest Rate, Stated Percentage | 6.45% |
Senior Notes [Member] | Series Due June 1, 2040 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | Jun. 01, 2040 |
Debt Instrument, Interest Rate, Stated Percentage | 5.85% |
Senior Notes [Member] | Series Due May 15, 2041 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | May 15, 2041 |
Debt Instrument, Interest Rate, Stated Percentage | 5.25% |
Senior Notes [Member] | Series Due May 1, 2043 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | May 01, 2043 |
Debt Instrument, Interest Rate, Stated Percentage | 3.90% |
Senior Notes [Member] | Series Due March 15, 2044 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | Mar. 15, 2044 |
Debt Instrument, Interest Rate, Stated Percentage | 4.55% |
Senior Notes [Member] | Series Due December 15, 2044 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | Dec. 15, 2044 |
Debt Instrument, Interest Rate, Stated Percentage | 4.00% |
Senior Notes [Member] | Series due April 1, 2047 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | Apr. 01, 2047 |
Debt Instrument, Interest Rate, Stated Percentage | 4.15% |
Senior Notes [Member] | Series due August 15, 2047 [Member] [Domain] | OG&E [Member] |  |
Debt Instrument, Maturity Date | Aug. 15, 2047 |
Debt Instrument, Interest Rate, Stated Percentage | 3.85% |
Long-term Debt [Member] | Due August 31, 2062 [Member] | OG&E [Member] |  |
Debt Instrument, Maturity Date | Aug. 31, 2062 |
Debt Instrument, Interest Rate, Stated Percentage | 3.70% |
Minimum [Member] | Debentures Subject to Mandatory Redemption [Member] | Garfield Industrial Authority, January 1, 2025 [Member] |  |
Debt Instrument, Interest Rate, Stated Percentage | 0.65% |
Minimum [Member] | Debentures Subject to Mandatory Redemption [Member] | Muskogee Industrial Authority, Janaury 1, 2025 [Member] |  |
Debt Instrument, Interest Rate, Stated Percentage | 0.65% |
Minimum [Member] | Debentures Subject to Mandatory Redemption [Member] | Muskogee Industrial Authority, June 1, 2027 [Member] |  |
Debt Instrument, Interest Rate, Stated Percentage | 0.66% |
Maximum [Member] | Debentures Subject to Mandatory Redemption [Member] | Garfield Industrial Authority, January 1, 2025 [Member] |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.86% |
Maximum [Member] | Debentures Subject to Mandatory Redemption [Member] | Muskogee Industrial Authority, Janaury 1, 2025 [Member] |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.80% |
Maximum [Member] | Debentures Subject to Mandatory Redemption [Member] | Muskogee Industrial Authority, June 1, 2027 [Member] |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.80% |

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