Short-Term Debt and Credit Facilities (Details) (USD $) In Millions, unless otherwise specified						12 Months Ended				12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013 OGE Energy [Member]		Dec. 31, 2012 OGE Energy [Member]	May 01, 2013 Midstream Partnership [Member]	Dec. 31, 2013 OG&E [Member]		Dec. 31, 2013 Enogex LLC [Member]
Line of Credit Facility [Line Items]
Short-term debt	$ 439.6		$ 430.9
Line of Credit Facility [Abstract]
Aggregate Commitment	1,150.0					750.0	[1]		1,400.0	400.0	[2]	400.0
Letters of Credit Outstanding, Amount										2.1	[2],[3]
Amount Outstanding	441.7	[3]				439.6	[1],[3]
Cash	6.8		1.8	4.6	2.3
Total	1,156.8
Weighted Average Interest Rate	0.30%					0.30%	[1],[4]	0.43%		0.53%	[2],[4]
Maturity						Dec. 13, 2017	[1],[5]			Dec. 13, 2017	[2],[5]
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.

[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.

[3] Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at December 31, 2013.

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

[5] In December 2011, the Company and OG&E entered into unsecured five-year revolving credit agreements to total in the aggregate $1,150.0 million ($750.0 million for the Company and $400.0 million for OG&E). Each of the credit facilities contain an option, which may be exercised up to two times, to extend the term for an additional year, subject to consent of a specified percentage of the lenders. Effective July 29, 2013, the Company and OG&E utilized one of these one-year extensions, and received consent from all of the lenders, to extend the maturity of their credit agreements to December 13, 2017.