Short-Term Debt and Credit Facilities (Details) (USD $) In Millions, unless otherwise specified						12 Months Ended			12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2012 OGE Energy [Member]		Dec. 31, 2011 OGE Energy [Member]	Dec. 31, 2012 OG&E [Member]		Dec. 31, 2012 Enogex LLC [Member]		Dec. 31, 2011 Enogex LLC [Member]
Line of Credit Facility [Line Items]
Short-term debt	$ 430.9		$ 277.1
Line of Credit Facility [Abstract]
Aggregate Commitment	1,550.0					750.0	[1]		400.0	[2]	400.0	[3]
Letters of Credit Outstanding, Amount									2.2	[2],[4]
Amount Outstanding	433.1	[4]				430.9	[1],[4]				0	[3],[4]	150.0
Cash	1.8		4.6	2.3	58.1
Total	1,551.8
Weighted Average Interest Rate	0.43%					0.43%	[1],[5]	0.48%	0.53%	[2],[5]	0.00%	[3],[5]
Maturity						Dec. 13, 2016	[1]		Dec. 13, 2016	[2]	Dec. 13, 2016	[3]
Period For Which Regulatory Approval Has Been Given to Acquire Short Term Debt									2 years
Short Term Borrowing Capacity That Has Regulatory Approval									$ 800

[1] 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, 2012, there was $430.9 million in outstanding commercial paper borrowings.

[2] 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.

[3] 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.

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

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