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Investment in Unconsolidated Affiliates Reconciliation of Equity in Earnings of Unconsolidated Affiliates (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items] |  |
OGE's share of Enable Net Income | $ 23.8 oge_ProportionateShareofUnconsolidatedAffiliateNetIncome | $ 42.5 oge_ProportionateShareofUnconsolidatedAffiliateNetIncome
Amortization of basis difference | 3.5 oge_EquityinEarningsAmortizationofBasisDifference | 3.6 oge_EquityinEarningsAmortizationofBasisDifference
Elimination of Enogex Holdings fair value and other adjustments | 4.4 oge_EquityinEarningsEliminationofFairValueAdjustments | 1.8 oge_EquityinEarningsEliminationofFairValueAdjustments
OGE's Equity in earnings of unconsolidated affiliates | $ 31.7 us-gaap_IncomeLossFromEquityMethodInvestments | $ 47.9 us-gaap_IncomeLossFromEquityMethodInvestments

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- Definition Equity in Earnings Amortization of Basis Difference + References No definition available. + Details
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Balance Type: | credit
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- Definition Equity in Earnings Elimination of Fair Value Adjustments + References No definition available. + Details
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- Definition Proportionate Share of Unconsolidated Affiliate Net Income + References No definition available. + Details
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Namespace Prefix: | oge_
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Balance Type: | credit
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
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