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Common Equity Dividends Restriction (Details) shares in Millions, $ in Millions | Dec. 31, 2017 USD ($) shares
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Preferred Stock, Shares Outstanding | shares | 0.0
Ratio of Consolidated Debt to Consolidated Capitalization | 65.00%
OGE Energy [Member] |
Ratio of Consolidated Debt to Consolidated Capitalization | 65.00%
Retained Earnings, Restricted | $ 605.3
Retained Earnings, Unrestricted | $ 2,200.0
Og and E [Member] |
Ratio of Consolidated Debt to Consolidated Capitalization | 65.00%
Retained Earnings, Restricted | $ 600.1
Retained Earnings, Unrestricted | $ 1,800.0

X
- Definition The percentage of consolidated debt to total consolidated capitalization, which the entity may not exceed pursuant to a debt covenant. + References No definition available. + Details
Name: | oge_RatioofConsolidatedDebttoConsolidatedCapitalization
Namespace Prefix: | oge_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The amount of retained earnings which are restricted from being paid out in dividends. Paying out this amount would cause the Company to exceed it's debt to total capitalization ratio established by the Company's debt covenants. + References No definition available. + Details
Name: | oge_RetainedEarningsRestricted
Namespace Prefix: | oge_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of retained earnings which are available to be paid out in dividends. + References No definition available. + Details
Name: | oge_RetainedEarningsUnrestricted
Namespace Prefix: | oge_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_PreferredStockSharesOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | dei_LegalEntityAxis=oge_OgeEnergyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=oge_OgAndEMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |