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Investment in Unconsolidated Affiliate and Related Party Transactions Summarized Income Statement of Equity Method Investment (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Equity Method Investments and Joint Ventures [Abstract]
Operating revenues	$ 3,367.0us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue	$ 2,123.0us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
Cost of sales	1,914.0us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCostOfSales	1,241.0us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCostOfSales
Operating income	586.0oge_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncome	322.0oge_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncome
Net income attributable to Enable	$ 530.0us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	$ 289.0us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss

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- Definition

Equity Method Investment, Summarized Financial Information, Operating Income

+ References

No definition available.

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- Definition

The amount of the cost of sales reported by an equity method investment of the entity.

+ References

No definition available.

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X

- Definition

The amount of net income (loss) reported by an equity method investment of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

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-Publisher FASB

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-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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- Definition

The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity.

+ References

No definition available.

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