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Rate Matters and Regulation Rate Matters and Regulation (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2015
Regional Haze [Member] |  |  |
Estimated Environmental Capital Costs |  |  | $ 1,100.0 oge_EstimatedEnvironmentalCapitalCosts / oge_EnvironmentalComplianceAxis = oge_RegionalHazeMember
SmartHours Program [Member] |  |  |
Lost Revenue Associated with Customer Programs | 11.6 oge_LostRevenueAssociatedwithCustomerPrograms / us-gaap_PublicUtilitiesRegulatoryProceedingAxis = oge_SmartHoursProgramMember | 10.1 oge_LostRevenueAssociatedwithCustomerPrograms / us-gaap_PublicUtilitiesRegulatoryProceedingAxis = oge_SmartHoursProgramMember |
Oklahoma Public Utility Division Staff [Member] | SmartHours Program [Member] |  |  |
Lost Revenue Associated with Customer Programs |  | 4.9 oge_LostRevenueAssociatedwithCustomerPrograms / oge_CommissionRecommendationAxis = oge_OklahomaPublicUtilityDivisionStaffMember / us-gaap_PublicUtilitiesRegulatoryProceedingAxis = oge_SmartHoursProgramMember |
Reduction of Revenue |  | $ 5.2 oge_ReductionofRevenue / oge_CommissionRecommendationAxis = oge_OklahomaPublicUtilityDivisionStaffMember / us-gaap_PublicUtilitiesRegulatoryProceedingAxis = oge_SmartHoursProgramMember |

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- Definition Estimated Environmental Capital Costs + References No definition available. + Details
Name: | oge_EstimatedEnvironmentalCapitalCosts
Namespace Prefix: | oge_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Lost Revenue Associated with Customer Programs + References No definition available. + Details
Name: | oge_LostRevenueAssociatedwithCustomerPrograms
Namespace Prefix: | oge_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Reduction of Revenue + References No definition available. + Details
Name: | oge_ReductionofRevenue
Namespace Prefix: | oge_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | oge_CommissionRecommendationAxis=oge_OklahomaPublicUtilityDivisionStaffMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | oge_EnvironmentalComplianceAxis=oge_RegionalHazeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=oge_SmartHoursProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |