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Summary of Significant Accounting Policies Depreciation and Amortization (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Provision for Depreciation Rate	2.80%oge_ProvisionForDepreciationRate	2.80%oge_ProvisionForDepreciationRate
Projected provision for depreciation in next fiscal year	2.80%oge_Projectedprovisionfordepreciationinnextfiscalyear
Percent Of Intangible Plant Balance Amortizable	96.00%oge_PercentOfIntangiblePlantBalanceAmortizable
Percent of Intangible Plant Balance Amortizable Thereafter	4.00%oge_PercentOfIntangiblePlantBalanceAmortizableThereafter
Transmission Equipment [Member] | OG&E [Member]
Amount of Acquisition Adjustments	3.3us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustments1 / dei_LegalEntityAxis = oge_OgAndEMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = oge_TransmissionEquipmentMember
Redbud Plant [Member]
Amount of Acquisition Adjustments	148.3us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustments1 / us-gaap_JointlyOwnedUtilityPlantAxis = oge_RedbudPlantMember	148.3us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustments1 / us-gaap_JointlyOwnedUtilityPlantAxis = oge_RedbudPlantMember

X

- Definition

Percent Of Intangible Plant Balance Amortizable

+ References

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X

- Definition

Percent of Intangible Plant Balance Amortizable Thereafter

+ References

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X

- Definition

Projected provision for depreciation in next fiscal year

+ References

No definition available.

+ Details

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- Definition

Provision for Depreciation Rate

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No definition available.

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X

- Definition

Amount of acquisition adjustments included in property, plant and equipment (PPE) for utilities.

+ References

No definition available.

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- Details

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X

- Details

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