Short-Term Debt and Credit Facilities (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009	Dec. 31, 2008
Line of Credit Facility [Line Items]
Short-term debt	$ 277.1		$ 145.0
Line of Credit Facility [Abstract]
Aggregate Commitment	1,550.0
Cash	4.6		2.3		58.1	174.4
Total	1,554.6
Amount Outstanding	429.3	[1]
Weighted Average Interest Rate	0.89%		0.34%	[2],[3]
Period For Which Regulatory Approval Has Been Given to Acquire Short Term Debt	2 years
OGE Energy [Member]
Line of Credit Facility [Abstract]
Aggregate Commitment	750.0	[2]
Amount Outstanding	277.1	[1],[2]
Weighted Average Interest Rate	0.48%	[2],[3]
Maturity	December 13, 2016	[2],[4]
OG&E [Member]
Line of Credit Facility [Abstract]
Aggregate Commitment	400.0	[5]
Amount Outstanding	2.2	[1],[5]
Weighted Average Interest Rate	0.53%	[3],[5]
Maturity	December 13, 2016	[4],[5]
Short Term Borrowing Capacity That Has Regulatory Approval	800
Enogex Llc [Member]
Line of Credit Facility [Abstract]
Aggregate Commitment	400.0	[6]
Amount Outstanding	$ 150.0	[1],[6]	$ 25.0	[1],[6]
Weighted Average Interest Rate	1.65%	[3],[6]
Maturity	December 13, 2016	[4],[6]

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

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

[4] In December 2011, the Company, OG&E and Enogex LLC each entered into new unsecured five-year revolving credit facilities totaling in the aggregate $1,550 million ($750 million for the Company, $400 million for OG&E and $400 million for Enogex LLC). Each of the credit facilities contain an option, which may be exercised up to two times, to extend the term for an additional year.

[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.

[6] 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.