Short-Term Debt and Credit Facilities (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2011		Dec. 31, 2010	Sep. 30, 2010	Dec. 31, 2009
Line of Credit Facility [Line Items]
Short-term debt	$ 289.0		$ 145.0
Line of Credit Facility [Abstract]
Aggregate Commitment	1,235.0
Cash	5.6		2.3	8.5	58.1
Total	1,240.6
Amount Outstanding	291.2	[1]
Weighted-Average Interest Rate	0.35%
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	596.0	[2]
Amount Outstanding	289.0	[1],[2]
Weighted-Average Interest Rate	0.36%	[2],[3]
Maturity	December 6, 2012	[2]
OG&E [Member]
Line of Credit Facility [Abstract]
Aggregate Commitment	389.0	[4]
Amount Outstanding	2.2	[1],[4]
Weighted-Average Interest Rate	0.14%	[3],[4]
Maturity	December 6, 2012	[4]
Short Term Borrowing Capacity That Has Regulatory Approval	800
Enogex Llc [Member]
Line of Credit Facility [Abstract]
Aggregate Commitment	250.0	[5]
Amount Outstanding	$ 0	[1],[5]
Weighted-Average Interest Rate	0.00%	[3],[5]
Maturity	March 31, 2013	[5]

[1] Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at September 30, 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 September 30, 2011, there was $289.0 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] 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 September 30, 2011, there was $2.2 million supporting letters of credit.

[5] This bank facility is available to provide revolving credit borrowings for Enogex LLC. As Enogex LLC's credit agreement matures on March 31, 2013, along with its intent in utilizing its credit agreement, borrowings thereunder are classified as long-term debt in the Company's Condensed Consolidated Balance Sheets.