CONSOLIDATED STATEMENTS OF CAPITALIZATION (USD $) In Millions, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Stockholders' Equity [Abstract]
Common stock, par value $0.01 per share; authorized 225.0 shares; and outstanding 98.1 and 97.6 shares, respectively	$ 1.0		$ 1.0
Premium on common stock	1,034.3		968.2
Retained earnings	1,574.8		1,380.6
Accumulated other comprehensive loss, net of tax	(40.6)		(60.2)
Treasury stock, at cost, 0.1 and 0 shares, respectively	6.2		0
Total OGE Energy stockholders' equity	2,563.3		2,289.6
Noncontrolling Interest	256.0		110.4
Total stockholders' equity	2,819.3		2,400.0
Interest Rate	5.25%
Weighted Average Interest Rate	0.89%		0.34%	[1],[2]
Amount Outstanding	429.3	[3]
Total long-term debt	2,737.1		2,362.9
Total Capitalization	5,556.4		4,762.9
OGE Energy [Member]
Stockholders' Equity [Abstract]
Unamortized Discount	(0.2)		(0.3)
OG&E [Member]
Stockholders' Equity [Abstract]
Unamortized Discount	(6.2)		(5.0)
Enogex Llc [Member]
Stockholders' Equity [Abstract]
Unamortized Discount	(1.9)		(2.2)
Enogex Llc [Member]
Stockholders' Equity [Abstract]
Weighted Average Interest Rate	1.65%	[1],[4]
Amount Outstanding	150.0	[3],[4]	25.0	[3],[4]
Enogex Llc [Member] | Senior Notes [Member] | Series Due July 15, 2014 [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	200.0		200.0
Interest Rate	6.88%
Enogex Llc [Member] | Senior Notes [Member] | Series Due March 15, 2020 [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	250.0		250.0
Interest Rate	6.25%
OGE Energy [Member] | Senior Notes [Member] | Series Due November 15, 2014 [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	100.0		100.0
Interest Rate	5.00%
OG&E [Member]
Stockholders' Equity [Abstract]
Weighted Average Interest Rate	0.53%	[1],[5]
Amount Outstanding	2.2	[3],[5]
OG&E [Member] | Senior Notes [Member] | Series Due January 15, 2016 [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	110.0		110.0
Interest Rate	5.15%
OG&E [Member] | Senior Notes [Member] | Series Due July 15, 2017 [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	125.0		125.0
Interest Rate	6.50%
OG&E [Member] | Senior Notes [Member] | Series Due September 1, 2018 [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	250.0		250.0
Interest Rate	6.35%
OG&E [Member] | Senior Notes [Member] | Series Due January 15, 2019 [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	250.0		250.0
Interest Rate	8.25%
OG&E [Member] | Senior Notes [Member] | Series Due July 15, 2027 [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	125.0		125.0
Interest Rate	6.65%
OG&E [Member] | Senior Notes [Member] | Series Due April 15, 2028 [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	100.0		100.0
Interest Rate	6.50%
OG&E [Member] | Senior Notes [Member] | Series Due August 1, 2034 [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	140.0		140.0
Interest Rate	6.50%
OG&E [Member] | Senior Notes [Member] | Series Due January 15, 2036 [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	110.0		110.0
Interest Rate	5.75%
OG&E [Member] | Senior Notes [Member] | Series Due February 1, 2038 [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	200.0		200.0
Interest Rate	6.45%
OG&E [Member] | Senior Notes [Member] | Series Due June 1, 2040 [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	250.0		250.0
Interest Rate	5.85%
OG&E [Member] | Senior Notes [Member] | Series Due May 15, 2041 [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	250.0		0
Interest Rate	5.25%
Debentures Subject to Mandatory Redemption [Member]
Stockholders' Equity [Abstract]
Total long-term debt	135.4
Garfield Industrial Authority, January 1, 2025 [Member] | Debentures Subject to Mandatory Redemption [Member] | OG&E [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	47.0		47.0
Muskogee Industrial Authority, Janaury 1, 2025 [Member] | Debentures Subject to Mandatory Redemption [Member] | OG&E [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	32.4		32.4
Muskogee Industrial Authority, June 1, 2027 [Member] | Debentures Subject to Mandatory Redemption [Member] | OG&E [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	$ 56.0		$ 56.0

[1] Represents the weighted-average interest rate for the outstanding borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit.

[2] This bank facility is available to back up OGE Energy's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility. At December 31, 2011, there was $277.1 million in outstanding commercial paper borrowings.

[3] Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at December 31, 2011.

[4] This bank facility is available to provide revolving credit borrowings for Enogex LLC. As Enogex LLC's credit agreement matures on December 13, 2016, along with its intent in utilizing its credit agreement, borrowings thereunder are classified as long-term debt in the Company's Consolidated Balance Sheets.

[5] This bank facility is available to back up OG&E's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility. At December 31, 2011, there was $2.2 million supporting letters of credit.