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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.

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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 of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + 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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