Short-Term Debt and Credit Facilities (Details) (USD $) In Millions, unless otherwise specified				6 Months Ended
	Jun. 30, 2014		Dec. 31, 2013	Jun. 30, 2014 OGE Energy [Member]		Jun. 30, 2014 OG&E [Member]		Jun. 30, 2014 December 13, 2017 [Member] OGE Energy [Member]	Jun. 30, 2014 December 13, 2017 [Member] OG&E [Member]
Line of Credit Facility [Line Items]
Short-term debt	$ 386.6		$ 439.6
Line of Credit Facility [Abstract]
Aggregate Commitment	1,150.0			750.0	[1]	400.0	[2]	65.2	34.8
Amount Outstanding	388.6	[3]		386.6	[1],[3]
Weighted Average Interest Rate	0.29%			0.28%	[1],[4]	0.47%	[2],[4]
Maturity				Dec. 13, 2018	[5]	Dec. 13, 2018	[5]
Letters of Credit Outstanding, Amount						2.0	[2],[3]
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 June 30, 2014.

[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 million ($750 million for the Company and $400 million for OG&E). Each of the facilities contained an option, which could be exercised up to two times, to extend the term of the respective facility for an additional year. Effective July 29, 2013, the Company and OG&E utilized one of those extensions to extend the maturity of their respective credit facility from December 13, 2016 to December 13, 2017. Effective June 24, 2014, the Company and OG&E utilized their second extension to extend the maturity of their respective credit facility from December 13, 2017 to December 13, 2018. Commitments of a single existing lender with respect to approximately $65.2 million and $34.8 million of the Company’s and OG&E’s credit facilities, respectively, however, were not extended and, unless the non-extending lender is replaced in accordance with the terms of the credit facility, such commitments will expire December 13, 2017.