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Derivative Instruments and Hedging Activities, Income Statement Presentation Related to Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 Enogex [Member] Cash Flow Hedging [Member] | Sep. 30, 2012 Enogex [Member] Cash Flow Hedging [Member] | Sep. 30, 2012 Enogex [Member] Not Designated as Hedging Instrument [Member] | Sep. 30, 2012 Enogex [Member] Not Designated as Hedging Instrument [Member] | Sep. 30, 2012 Enogex [Member] Natural gas [Member] Fixed Swaps/Futures [Member] Cash Flow Hedging [Member] | Sep. 30, 2012 Enogex [Member] Natural gas [Member] Fixed Swaps/Futures [Member] Cash Flow Hedging [Member] | Sep. 30, 2012 Enogex [Member] Natural gas [Member] Fixed Swaps/Futures [Member] Not Designated as Hedging Instrument [Member] | Sep. 30, 2012 Enogex [Member] Natural gas [Member] Fixed Swaps/Futures [Member] Not Designated as Hedging Instrument [Member] | Sep. 30, 2012 Enogex [Member] Sales [Member] Natural gas [Member] Physical [Member] Not Designated as Hedging Instrument [Member] | Sep. 30, 2012 Enogex [Member] Sales [Member] Natural gas [Member] Physical [Member] Not Designated as Hedging Instrument [Member] | Sep. 30, 2012 OGE Energy Corp. [Member] Interest Rate Swap [Member] Cash Flow Hedging [Member] | Sep. 30, 2012 OGE Energy Corp. [Member] Interest Rate Swap [Member] Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount Recognized in Other Comprehensive Income |  | $ (0.8) | $ (1.0) |  |  | $ (0.8) | $ (1.0) |  |  |  |  | $ 0 | $ 0
Amount Reclassifed from Accumulated Other Comprehensive Income (Loss) into Income |  | (0.1) | 4.9 |  |  | 0 | 5.2 |  |  |  |  | (0.1) | (0.3)
Amount Recognized in Income |  | 0 | 0 | (2.9) | (8.0) | 0 | 0 | (0.2) | 0.8 | (2.7) | (8.8) | 0 | 0
Derivative Instruments With Credit Risk Related Contingent Features | $ 0 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Derivative Instruments With Credit Risk Related Contingent Features + References No definition available. + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624177-113959 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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