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Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loss Contingencies [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 7,400,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
Operating Leases, Future Minimum Payments, Due in Two Years	31,600,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
Operating Leases, Future Minimum Payments, Due in Three Years	4,200,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
Operating Leases, Future Minimum Payments, Due in Four Years	3,100,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
Operating Leases, Future Minimum Payments, Due in Five Years	2,400,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
Operating Leases, Future Minimum Payments, Due Thereafter	46,400,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
Operating Leases, Future Minimum Payments Due	95,100,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Operating Leases, Rent Expense, Net	6,700,000us-gaap_OperatingLeasesRentExpenseNet	8,800,000us-gaap_OperatingLeasesRentExpenseNet	14,200,000us-gaap_OperatingLeasesRentExpenseNet
Purchase Obligation, Due in Next Twelve Months	676,300,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary
Unrecorded Unconditional Purchase Obligation, Due within Two Years	608,400,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary
Unrecorded Unconditional Purchase Obligation, Due within Three Years	386,100,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary
Unrecorded Unconditional Purchase Obligation, Due within Four Years	296,100,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary
Unrecorded Unconditional Purchase Obligation, Due within Five Years	245,500,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary
Long-term Purchase Commitment, Amount	2,212,400,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
Utilities Operating Expense, Purchased Power under Long-term Contracts	60,800,000us-gaap_UtilitiesOperatingExpensePurchasedPowerUnderLongTermContracts	62,000,000us-gaap_UtilitiesOperatingExpensePurchasedPowerUnderLongTermContracts	49,500,000us-gaap_UtilitiesOperatingExpensePurchasedPowerUnderLongTermContracts
OG&E Railcar Lease Agreement [Member]
Loss Contingencies [Line Items]
Loss Contingency, Range of Possible Loss, Maximum	22,800,000us-gaap_LossContingencyRangeOfPossibleLossMaximum / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_MarketValueGuaranteeMember
OG&E Railcar Lease Agreement [Member]
Loss Contingencies [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	4,500,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent / oge_OperatingLeaseObligationsAxis = oge_OgeRailcarLeaseAgreementMember
Operating Leases, Future Minimum Payments, Due in Two Years	28,700,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears / oge_OperatingLeaseObligationsAxis = oge_OgeRailcarLeaseAgreementMember
Operating Leases, Future Minimum Payments, Due in Three Years	1,000,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears / oge_OperatingLeaseObligationsAxis = oge_OgeRailcarLeaseAgreementMember
Operating Leases, Future Minimum Payments, Due in Four Years	0us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears / oge_OperatingLeaseObligationsAxis = oge_OgeRailcarLeaseAgreementMember
Operating Leases, Future Minimum Payments, Due in Five Years	0us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears / oge_OperatingLeaseObligationsAxis = oge_OgeRailcarLeaseAgreementMember
Operating Leases, Future Minimum Payments, Due Thereafter	0us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter / oge_OperatingLeaseObligationsAxis = oge_OgeRailcarLeaseAgreementMember
Operating Leases, Future Minimum Payments Due	34,200,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue / oge_OperatingLeaseObligationsAxis = oge_OgeRailcarLeaseAgreementMember
OG&E Wind Farm Land Lease Agreements [Member]
Loss Contingencies [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	2,100,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent / oge_OperatingLeaseObligationsAxis = oge_OgeWindFarmLandLeaseAgreementsMember
Operating Leases, Future Minimum Payments, Due in Two Years	2,100,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears / oge_OperatingLeaseObligationsAxis = oge_OgeWindFarmLandLeaseAgreementsMember
Operating Leases, Future Minimum Payments, Due in Three Years	2,400,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears / oge_OperatingLeaseObligationsAxis = oge_OgeWindFarmLandLeaseAgreementsMember
Operating Leases, Future Minimum Payments, Due in Four Years	2,400,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears / oge_OperatingLeaseObligationsAxis = oge_OgeWindFarmLandLeaseAgreementsMember
Operating Leases, Future Minimum Payments, Due in Five Years	2,400,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears / oge_OperatingLeaseObligationsAxis = oge_OgeWindFarmLandLeaseAgreementsMember
Operating Leases, Future Minimum Payments, Due Thereafter	46,400,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter / oge_OperatingLeaseObligationsAxis = oge_OgeWindFarmLandLeaseAgreementsMember
Operating Leases, Future Minimum Payments Due	57,800,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue / oge_OperatingLeaseObligationsAxis = oge_OgeWindFarmLandLeaseAgreementsMember
OGE Energy Building Lease [Member]
Loss Contingencies [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	800,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent / oge_OperatingLeaseObligationsAxis = oge_OgeEnergyBuildingLeaseMember
Operating Leases, Future Minimum Payments, Due in Two Years	800,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears / oge_OperatingLeaseObligationsAxis = oge_OgeEnergyBuildingLeaseMember
Operating Leases, Future Minimum Payments, Due in Three Years	800,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears / oge_OperatingLeaseObligationsAxis = oge_OgeEnergyBuildingLeaseMember
Operating Leases, Future Minimum Payments, Due in Four Years	700,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears / oge_OperatingLeaseObligationsAxis = oge_OgeEnergyBuildingLeaseMember
Operating Leases, Future Minimum Payments, Due in Five Years	0us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears / oge_OperatingLeaseObligationsAxis = oge_OgeEnergyBuildingLeaseMember
Operating Leases, Future Minimum Payments, Due Thereafter	0us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter / oge_OperatingLeaseObligationsAxis = oge_OgeEnergyBuildingLeaseMember
Operating Leases, Future Minimum Payments Due	3,100,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue / oge_OperatingLeaseObligationsAxis = oge_OgeEnergyBuildingLeaseMember
OG&E cogeneration capacity and fixed operation and maintenance payments [Member]
Loss Contingencies [Line Items]
Purchase Obligation, Due in Next Twelve Months	85,200,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / dei_LegalEntityAxis = oge_OgeCogenerationCapacityAndFixedOperationAndMaintenancePaymentsMember
Unrecorded Unconditional Purchase Obligation, Due within Two Years	83,300,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary / dei_LegalEntityAxis = oge_OgeCogenerationCapacityAndFixedOperationAndMaintenancePaymentsMember
Unrecorded Unconditional Purchase Obligation, Due within Three Years	80,700,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary / dei_LegalEntityAxis = oge_OgeCogenerationCapacityAndFixedOperationAndMaintenancePaymentsMember
Unrecorded Unconditional Purchase Obligation, Due within Four Years	77,800,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary / dei_LegalEntityAxis = oge_OgeCogenerationCapacityAndFixedOperationAndMaintenancePaymentsMember
Unrecorded Unconditional Purchase Obligation, Due within Five Years	70,600,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary / dei_LegalEntityAxis = oge_OgeCogenerationCapacityAndFixedOperationAndMaintenancePaymentsMember
Long-term Purchase Commitment, Amount	397,600,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount / dei_LegalEntityAxis = oge_OgeCogenerationCapacityAndFixedOperationAndMaintenancePaymentsMember
OG&E expected cogeneration energy payments [Member]
Loss Contingencies [Line Items]
Purchase Obligation, Due in Next Twelve Months	74,400,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / dei_LegalEntityAxis = oge_OgeExpectedCogenerationEnergyPaymentsMember
Unrecorded Unconditional Purchase Obligation, Due within Two Years	78,500,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary / dei_LegalEntityAxis = oge_OgeExpectedCogenerationEnergyPaymentsMember
Unrecorded Unconditional Purchase Obligation, Due within Three Years	81,200,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary / dei_LegalEntityAxis = oge_OgeExpectedCogenerationEnergyPaymentsMember
Unrecorded Unconditional Purchase Obligation, Due within Four Years	89,700,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary / dei_LegalEntityAxis = oge_OgeExpectedCogenerationEnergyPaymentsMember
Unrecorded Unconditional Purchase Obligation, Due within Five Years	85,100,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary / dei_LegalEntityAxis = oge_OgeExpectedCogenerationEnergyPaymentsMember
Long-term Purchase Commitment, Amount	408,900,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount / dei_LegalEntityAxis = oge_OgeExpectedCogenerationEnergyPaymentsMember
OG&E minimum fuel purchase commitments [Member]
Loss Contingencies [Line Items]
Purchase Obligation, Due in Next Twelve Months	389,300,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / dei_LegalEntityAxis = oge_OgeMinimumFuelPurchaseCommitmentsMember
Unrecorded Unconditional Purchase Obligation, Due within Two Years	246,600,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary / dei_LegalEntityAxis = oge_OgeMinimumFuelPurchaseCommitmentsMember
Unrecorded Unconditional Purchase Obligation, Due within Three Years	43,600,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary / dei_LegalEntityAxis = oge_OgeMinimumFuelPurchaseCommitmentsMember
Unrecorded Unconditional Purchase Obligation, Due within Four Years	0us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary / dei_LegalEntityAxis = oge_OgeMinimumFuelPurchaseCommitmentsMember
Unrecorded Unconditional Purchase Obligation, Due within Five Years	0us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary / dei_LegalEntityAxis = oge_OgeMinimumFuelPurchaseCommitmentsMember
Long-term Purchase Commitment, Amount	679,500,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount / dei_LegalEntityAxis = oge_OgeMinimumFuelPurchaseCommitmentsMember
Long-term Purchase Commitment, Amount	625,800,000us-gaap_LongTermPurchaseCommitmentAmount / dei_LegalEntityAxis = oge_OgeMinimumFuelPurchaseCommitmentsMember	657,300,000us-gaap_LongTermPurchaseCommitmentAmount / dei_LegalEntityAxis = oge_OgeMinimumFuelPurchaseCommitmentsMember	585,600,000us-gaap_LongTermPurchaseCommitmentAmount / dei_LegalEntityAxis = oge_OgeMinimumFuelPurchaseCommitmentsMember
OG&E expected wind purchase commitments [Member]
Loss Contingencies [Line Items]
Purchase Obligation, Due in Next Twelve Months	58,400,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / dei_LegalEntityAxis = oge_OgeExpectedWindPurchaseCommitmentsMember
Unrecorded Unconditional Purchase Obligation, Due within Two Years	59,300,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary / dei_LegalEntityAxis = oge_OgeExpectedWindPurchaseCommitmentsMember
Unrecorded Unconditional Purchase Obligation, Due within Three Years	60,300,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary / dei_LegalEntityAxis = oge_OgeExpectedWindPurchaseCommitmentsMember
Unrecorded Unconditional Purchase Obligation, Due within Four Years	59,100,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary / dei_LegalEntityAxis = oge_OgeExpectedWindPurchaseCommitmentsMember
Unrecorded Unconditional Purchase Obligation, Due within Five Years	58,400,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary / dei_LegalEntityAxis = oge_OgeExpectedWindPurchaseCommitmentsMember
Long-term Purchase Commitment, Amount	295,500,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount / dei_LegalEntityAxis = oge_OgeExpectedWindPurchaseCommitmentsMember
OG&E long-term service agreement commitments [Member]
Loss Contingencies [Line Items]
Purchase Obligation, Due in Next Twelve Months	2,500,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / dei_LegalEntityAxis = oge_OgeLongTermServiceAgreementCommitmentsMember
Unrecorded Unconditional Purchase Obligation, Due within Two Years	2,600,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary / dei_LegalEntityAxis = oge_OgeLongTermServiceAgreementCommitmentsMember
Unrecorded Unconditional Purchase Obligation, Due within Three Years	2,700,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary / dei_LegalEntityAxis = oge_OgeLongTermServiceAgreementCommitmentsMember
Unrecorded Unconditional Purchase Obligation, Due within Four Years	19,400,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary / dei_LegalEntityAxis = oge_OgeLongTermServiceAgreementCommitmentsMember
Unrecorded Unconditional Purchase Obligation, Due within Five Years	27,500,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary / dei_LegalEntityAxis = oge_OgeLongTermServiceAgreementCommitmentsMember
Long-term Purchase Commitment, Amount	54,700,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount / dei_LegalEntityAxis = oge_OgeLongTermServiceAgreementCommitmentsMember
Environmental Compliance Plan [Member]
Loss Contingencies [Line Items]
Purchase Obligation, Due in Next Twelve Months	66,500,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / dei_LegalEntityAxis = oge_EnvironmentalCompliancePlanMember
Unrecorded Unconditional Purchase Obligation, Due within Two Years	138,100,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary / dei_LegalEntityAxis = oge_EnvironmentalCompliancePlanMember
Unrecorded Unconditional Purchase Obligation, Due within Three Years	117,600,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary / dei_LegalEntityAxis = oge_EnvironmentalCompliancePlanMember
Unrecorded Unconditional Purchase Obligation, Due within Four Years	50,100,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary / dei_LegalEntityAxis = oge_EnvironmentalCompliancePlanMember
Unrecorded Unconditional Purchase Obligation, Due within Five Years	3,900,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary / dei_LegalEntityAxis = oge_EnvironmentalCompliancePlanMember
Long-term Purchase Commitment, Amount	376,200,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount / dei_LegalEntityAxis = oge_EnvironmentalCompliancePlanMember
Public Utility Regulatory Policy Act of 1978 [Member]
Loss Contingencies [Line Items]
Percentage of output purchased	100.00%oge_PercentageOfOutputPurchased / dei_LegalEntityAxis = oge_PublicUtilityRegulatoryPolicyActOf1978Member
OG&E total cogeneration payments [Member]
Loss Contingencies [Line Items]
Long-term Purchase Commitment, Amount	129,400,000us-gaap_LongTermPurchaseCommitmentAmount / dei_LegalEntityAxis = oge_OgeTotalCogenerationPaymentsMember	134,800,000us-gaap_LongTermPurchaseCommitmentAmount / dei_LegalEntityAxis = oge_OgeTotalCogenerationPaymentsMember	135,100,000us-gaap_LongTermPurchaseCommitmentAmount / dei_LegalEntityAxis = oge_OgeTotalCogenerationPaymentsMember
OG&E capacity payments [Member]
Loss Contingencies [Line Items]
Long-term Purchase Commitment, Amount	72,300,000us-gaap_LongTermPurchaseCommitmentAmount / dei_LegalEntityAxis = oge_OgeCapacityPaymentsMember	74,400,000us-gaap_LongTermPurchaseCommitmentAmount / dei_LegalEntityAxis = oge_OgeCapacityPaymentsMember	77,100,000us-gaap_LongTermPurchaseCommitmentAmount / dei_LegalEntityAxis = oge_OgeCapacityPaymentsMember
CPV Keenan [Member]
Loss Contingencies [Line Items]
Utilities Operating Expense, Purchased Power under Long-term Contracts	28,100,000us-gaap_UtilitiesOperatingExpensePurchasedPowerUnderLongTermContracts / dei_LegalEntityAxis = oge_CpvKeenanMember	30,900,000us-gaap_UtilitiesOperatingExpensePurchasedPowerUnderLongTermContracts / dei_LegalEntityAxis = oge_CpvKeenanMember	25,100,000us-gaap_UtilitiesOperatingExpensePurchasedPowerUnderLongTermContracts / dei_LegalEntityAxis = oge_CpvKeenanMember
Edison Mission Energy [Member]
Loss Contingencies [Line Items]
Utilities Operating Expense, Purchased Power under Long-term Contracts	21,300,000us-gaap_UtilitiesOperatingExpensePurchasedPowerUnderLongTermContracts / dei_LegalEntityAxis = oge_EdisonMissionEnergyMember	20,600,000us-gaap_UtilitiesOperatingExpensePurchasedPowerUnderLongTermContracts / dei_LegalEntityAxis = oge_EdisonMissionEnergyMember	20,200,000us-gaap_UtilitiesOperatingExpensePurchasedPowerUnderLongTermContracts / dei_LegalEntityAxis = oge_EdisonMissionEnergyMember
FPL Energy [Member]
Loss Contingencies [Line Items]
Utilities Operating Expense, Purchased Power under Long-term Contracts	3,600,000us-gaap_UtilitiesOperatingExpensePurchasedPowerUnderLongTermContracts / dei_LegalEntityAxis = oge_FplEnergyMember	3,300,000us-gaap_UtilitiesOperatingExpensePurchasedPowerUnderLongTermContracts / dei_LegalEntityAxis = oge_FplEnergyMember	3,400,000us-gaap_UtilitiesOperatingExpensePurchasedPowerUnderLongTermContracts / dei_LegalEntityAxis = oge_FplEnergyMember
NextEra Energy [Member]
Loss Contingencies [Line Items]
Utilities Operating Expense, Purchased Power under Long-term Contracts	7,800,000us-gaap_UtilitiesOperatingExpensePurchasedPowerUnderLongTermContracts / dei_LegalEntityAxis = oge_NexteraEnergyMember	7,200,000us-gaap_UtilitiesOperatingExpensePurchasedPowerUnderLongTermContracts / dei_LegalEntityAxis = oge_NexteraEnergyMember	800,000us-gaap_UtilitiesOperatingExpensePurchasedPowerUnderLongTermContracts / dei_LegalEntityAxis = oge_NexteraEnergyMember
OG&E long-term service agreement commitments [Member] | McClain Plant [Member]
Loss Contingencies [Line Items]
Factored-Fired Hours	128,000oge_FactoredFiredHours / dei_LegalEntityAxis = oge_McclainPlantMember / oge_NewLongTermServiceAgreementAxis = oge_OgeLongTermServiceAgreementCommitmentsMember
Factored-Fired Starts	3,600oge_FactoredFiredStarts / dei_LegalEntityAxis = oge_McclainPlantMember / oge_NewLongTermServiceAgreementAxis = oge_OgeLongTermServiceAgreementCommitmentsMember
OG&E long-term service agreement commitments [Member] | Redbud Plant [Member]
Loss Contingencies [Line Items]
Factored-Fired Hours	144,000oge_FactoredFiredHours / dei_LegalEntityAxis = oge_RedbudPlantMember / oge_NewLongTermServiceAgreementAxis = oge_OgeLongTermServiceAgreementCommitmentsMember
Factored-Fired Starts	4,500oge_FactoredFiredStarts / dei_LegalEntityAxis = oge_RedbudPlantMember / oge_NewLongTermServiceAgreementAxis = oge_OgeLongTermServiceAgreementCommitmentsMember
Additional Factored-Fired Hours	24,000oge_AdditionalFactoredFiredHours / dei_LegalEntityAxis = oge_RedbudPlantMember / oge_NewLongTermServiceAgreementAxis = oge_OgeLongTermServiceAgreementCommitmentsMember
New Source Review [Member]
Loss Contingencies [Line Items]
Estimated Environmental Capital Costs	1,100,000,000oge_EstimatedEnvironmentalCapitalCosts / oge_EnvironmentalComplianceAxis = oge_NewSourceReviewMember
Potential Penalty Under the Federal Clean Air Act	$ 37,500oge_PotentialPenaltyUnderFederalCleanAirAct / oge_EnvironmentalComplianceAxis = oge_NewSourceReviewMember

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Estimated Environmental Capital Costs

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Percentage of output purchased

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Potential Penalty Under the Federal Clean Air Act

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The minimum amount the entity agreed to spend under the long-term purchase commitment.

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The estimated maximum amount of possible loss from the contingency.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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-Section 50

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-Section 50

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

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