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Accounting Pronouncements (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2017 USD ($)
Accounting Pronouncements [Abstract] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 22.3

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- Definition Accounting Pronouncements [Abstract] + References No definition available. + Details
Name: | oge_AccountingPronouncementsAbstract
Namespace Prefix: | oge_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the quantification of the effect of adopting the new accounting standard or change in accounting principle expected by the entity to have a significant effect on the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration