CONSOLIDATED STATEMENTS OF CAPITALIZATION (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Capitalization, Long-term Debt [Line Items]
Common stock, par value $0.01 per share; authorized 450.0 shares; and outstanding 198.5 and 197.5 shares, respectively	$ 2.0	$ 1.0
Premium on common stock	1,071.6	1,046.4
Retained earnings	1,991.7	1,772.4
Accumulated other comprehensive loss, net of tax	(28.2)	(49.1)
Treasury stock, at cost, 0.1 and 0.1 shares, respectively	0	3.5
Total OGE Energy stockholders' equity	3,037.1	2,767.2
Noncontrolling interest	0	305.2
Total stockholders' equity	3,037.1	3,072.4
Total long-term debt	2,400.1	2,848.6
Less long-term debt due within one year	(100.0)	0
Total long-term debt (excluding debt due within one year)	2,300.1	2,848.6
Total Capitalization	5,437.2	5,921.0
OGE Energy [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Debt Instrument, Unamortized Discount	(0.1)	(0.1)
Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Debt Instrument, Unamortized Discount	(5.5)	(5.8)
Enogex LLC [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Debt Instrument, Unamortized Discount		(1.6)
Senior Notes [Member] | Series Due November 15, 2014 [Member] | OGE Energy [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	100.0	100.0
Senior Notes [Member] | Series Due January 15, 2016 [Member] | Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	110.0	110.0
Senior Notes [Member] | Series Due July 15, 2017 [Member] | Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	125.0	125.0
Senior Notes [Member] | Series Due September 1, 2018 [Member] | Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	250.0	250.0
Senior Notes [Member] | Series Due January 15, 2019 [Member] | Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	250.0	250.0
Senior Notes [Member] | Series Due July 15, 2027 [Member] | Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	125.0	125.0
Senior Notes [Member] | Series Due April 15, 2028 [Member] | Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	100.0	100.0
Senior Notes [Member] | Series Due August 1, 2034 [Member] | Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	140.0	140.0
Senior Notes [Member] | Series Due January 15, 2036 [Member] | Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	110.0	110.0
Senior Notes [Member] | Series Due February 1, 2038 [Member] | Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	200.0	200.0
Senior Notes [Member] | Series Due June 1, 2040 [Member] | Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	250.0	250.0
Senior Notes [Member] | Senior Notes due May 15, 2041 [Member] | Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	250.0	250.0
Senior Notes [Member] | Series due May 1, 2043 [Member] | Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	250.0	0
Senior Notes [Member] | Series Due July 15, 2014 [Member] | Enogex LLC [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross		200.0
Senior Notes [Member] | Series Due August 2, 2015 [Member] | Enogex LLC [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross		250.0
Senior Notes [Member] | Series Due March 15, 2020 [Member] | Enogex LLC [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross		250.0
Long-term Debt [Member] | Due August 31, 2062 [Member] | Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	10.3	10.7
Debentures Subject to Mandatory Redemption [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Total long-term debt	135.4
Debentures Subject to Mandatory Redemption [Member] | Garfield Industrial Authority Bond [Member] | Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	47.0	47.0
Debentures Subject to Mandatory Redemption [Member] | Muskogee Industrial Authority Bond Due 2025 [Member] | Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	32.4	32.4
Debentures Subject to Mandatory Redemption [Member] | Muskogee Industrial Authority Bond Due 2027 [Member] | Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	$ 56.0	$ 56.0