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v2.4.1.9

Rate Matters and Regulation (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Oklahoma Corporation Commission [Member] |
OG&E's Jurisdictional Revenues | 84.00%oge_OgesJurisdictionalRevenues / dei_LegalEntityAxis = oge_OklahomaCorporationCommissionMember
Arkansas Public Service Commission [Member] |
OG&E's Jurisdictional Revenues | 8.00%oge_OgesJurisdictionalRevenues / dei_LegalEntityAxis = oge_ArkansasPublicServiceCommissionMember
Federal Energy Regulatory Commission [Member] |
OG&E's Jurisdictional Revenues | 8.00%oge_OgesJurisdictionalRevenues / dei_LegalEntityAxis = oge_FederalEnergyRegulatoryCommissionMember
Regional Haze [Member] |
Estimated Environmental Capital Costs | 1,100.0 oge_EstimatedEnvironmentalCapitalCosts / oge_EnvironmentalComplianceAxis = oge_RegionalHazeMember
Section 206 Complaint [Member] |
Reduction of Revenue | 0.9 oge_ReductionofRevenue / us-gaap_PublicUtilitiesRegulatoryProceedingAxis = oge_Section206ComplaintMember

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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 OG&E's Jurisdictional Revenues + References No definition available. + Details
Name: | oge_OgesJurisdictionalRevenues
Namespace Prefix: | oge_
Data Type: | num:percentItemType
Balance Type: | na
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: | dei_LegalEntityAxis=oge_ArkansasPublicServiceCommissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=oge_Section206ComplaintMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |