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