Short-Term Debt and Credit Facilities (Details) (USD $) In Millions, unless otherwise specified				9 Months Ended
	Sep. 30, 2013		Dec. 31, 2012	Sep. 30, 2013 OGE Energy [Member]		Sep. 30, 2013 OG&E [Member]		May 01, 2013 Midstream Partnership [Member]	Sep. 30, 2013 Enogex LLC [Member]
Line of Credit Facility [Line Items]
Short-term debt	$ 447.0		$ 430.9
Line of Credit Facility [Abstract]
Aggregate Commitment	1,150.0			750.0	[1]	400.0	[2]	1,400.0	400.0	[2]
Amount Outstanding	449.1	[3]		447.0	[1],[3]	2.1	[2],[3]
Total	1,150.0	[4]
Weighted Average Interest Rate	0.30%			0.30%	[1],[5]	0.53%	[2],[5]
Maturity				Dec. 13, 2017	[6]	Dec. 13, 2017	[6]
Short Term Borrowing Capacity That Has Regulatory Approval						$ 800
Period For Which Regulatory Approval Has Been Given to Acquire Short Term Debt						2 years

[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 September 30, 2013.

[4] Effective May 1, 2013, Enable Midstream Partners entered into a $1.4 billion, five-year senior unsecured revolving credit facility in accordance with the terms of the Master Formation Agreement and Enogex LLC's $400 million revolving credit facility was terminated.

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

[6] 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 million for the Company and $400 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.