CONSOLIDATED STATEMENTS OF CAPITALIZATION (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Stockholders' Equity [Abstract]
Common stock, par value $0.01 per share; authorized 225.0 shares; and outstanding 98.8 and 98.1 shares, respectively	$ 1.0		$ 1.0
Premium on common stock	1,046.4		1,034.3
Retained earnings	1,772.4		1,574.8
Accumulated other comprehensive loss, net of tax	(49.1)		(40.6)
Treasury stock, at cost, 0.1 and 0.1 shares, respectively	(3.5)		(6.2)
Total OGE Energy stockholders' equity	2,767.2		2,563.3
Noncontrolling Interest	305.2		256.0
Total stockholders' equity	3,072.4		2,819.3
Weighted Average Interest Rate	0.43%
Amount Outstanding	433.1	[1]
Total long-term debt	2,848.6		2,737.1
Total Capitalization	5,921.0		5,556.4
OGE Energy [Member]
Stockholders' Equity [Abstract]
Unamortized Discount	(0.1)		(0.2)
OG&E [Member]
Stockholders' Equity [Abstract]
Weighted Average Interest Rate	0.53%	[2],[3]
Unamortized Discount	(5.8)		(6.2)
Enogex LLC [Member]
Stockholders' Equity [Abstract]
Weighted Average Interest Rate	0.00%	[2],[4]
Amount Outstanding	0	[1],[4]	150.0
Unamortized Discount	(1.6)		(1.9)
Debentures Subject to Mandatory Redemption [Member]
Stockholders' Equity [Abstract]
Total long-term debt	135.4
Series Due November 15, 2014 [Member] | OGE Energy [Member] | Senior Notes [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	100.0		100.0
Debt, Weighted Average Interest Rate	5.00%
Series Due January 15, 2016 [Member] | OG&E [Member] | Senior Notes [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	110.0		110.0
Debt, Weighted Average Interest Rate	5.15%
Series Due July 15, 2017 [Member] | OG&E [Member] | Senior Notes [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	125.0		125.0
Debt, Weighted Average Interest Rate	6.50%
Series Due September 1, 2018 [Member] | OG&E [Member] | Senior Notes [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	250.0		250.0
Debt, Weighted Average Interest Rate	6.35%
Series Due January 15, 2019 [Member] | OG&E [Member] | Senior Notes [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	250.0		250.0
Debt, Weighted Average Interest Rate	8.25%
Series Due July 15, 2027 [Member] | OG&E [Member] | Senior Notes [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	125.0		125.0
Debt, Weighted Average Interest Rate	6.65%
Series Due April 15, 2028 [Member] | OG&E [Member] | Senior Notes [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	100.0		100.0
Debt, Weighted Average Interest Rate	6.50%
Series Due August 1, 2034 [Member] | OG&E [Member] | Senior Notes [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	140.0		140.0
Debt, Weighted Average Interest Rate	6.50%
Series Due January 15, 2036 [Member] | OG&E [Member] | Senior Notes [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	110.0		110.0
Debt, Weighted Average Interest Rate	5.75%
Series Due February 1, 2038 [Member] | OG&E [Member] | Senior Notes [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	200.0		200.0
Debt, Weighted Average Interest Rate	6.45%
Series Due June 1, 2040 [Member] | OG&E [Member] | Senior Notes [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	250.0		250.0
Debt, Weighted Average Interest Rate	5.85%
Senior Notes due May 15, 2041 [Member] | OG&E [Member] | Senior Notes [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	250.0		250.0
Debt, Weighted Average Interest Rate	5.25%
Due August 31, 2062 [Member] | OG&E [Member] | Long-term Debt [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	10.7		0
Debt, Weighted Average Interest Rate	3.70%
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
Series Due July 15, 2014 [Member] | Enogex LLC [Member] | Senior Notes [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	200.0		200.0
Debt, Weighted Average Interest Rate	6.875%
Series Due August 2, 2015 [Member] | Enogex LLC [Member] | Senior Notes [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	250.0		0
Debt, Weighted Average Interest Rate	1.72%
Series Due March 15, 2020 [Member] | Enogex LLC [Member] | Senior Notes [Member]
Stockholders' Equity [Abstract]
Long term debt, gross	$ 250.0		$ 250.0
Debt, Weighted Average Interest Rate	6.25%

[1] Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at December 31, 2012.

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

[3] 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, 2012, there was $2.2 million supporting letters of credit.

[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.