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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.

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- Definition Line of Credit Facility Maximum Borrowing Capacity and Cash and Cash Equivalents at Carrying Value + References No definition available. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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