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Commitments and Contingencies (Details) (New Source Review [Member], USD $) | Mar. 31, 2015
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New Source Review [Member] |
Long-term Purchase Commitment [Line Items] |
Estimated Environmental Capital Costs | $ 1,100,000,000 oge_EstimatedEnvironmentalCapitalCosts / oge_EnvironmentalComplianceAxis = oge_NewSourceReviewMember
Potential Penalty Under the Federal Clean Air Act | $ 37,500 oge_PotentialPenaltyUnderFederalCleanAirAct / oge_EnvironmentalComplianceAxis = oge_NewSourceReviewMember

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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 Potential Penalty Under the Federal Clean Air Act + References No definition available. + Details
Name: | oge_PotentialPenaltyUnderFederalCleanAirAct
Namespace Prefix: | oge_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_LongTermPurchaseCommitmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration