Annual Revenue Cap For Rider

No definition available.

Name:	fe_AnnualRevenueCapForRider
Namespace Prefix:	fe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Loss Contingency, Payment Audit, Number Of Payments Examined

+ References

No definition available.

+ Details

Name:	fe_LossContingencyPaymentAuditNumberOfPaymentsExamined
Namespace Prefix:	fe_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Loss Contingency, Payment Audit, Payments In Support Of Passage Of House Bill Allocated To Defendants

+ References

No definition available.

+ Details

Name:	fe_LossContingencyPaymentAuditPaymentsInSupportOfPassageOfHouseBillAllocatedToDefendants
Namespace Prefix:	fe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Loss Contingency, Payment Audit, Total Payments In Support Of Passage Of House Bill

+ References

No definition available.

+ Details

Name:	fe_LossContingencyPaymentAuditTotalPaymentsInSupportOfPassageOfHouseBill
Namespace Prefix:	fe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Loss Contingency, Refund to Customer, Pole Attachment Rates

+ References

No definition available.

+ Details

Name:	fe_LossContingencyRefundToCustomerPoleAttachmentRates
Namespace Prefix:	fe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Proposed Action, Reduction In Power Plants Carbon Pollution, Percentage

+ References

No definition available.

+ Details

Name:	fe_ProposedActionReductionInPowerPlantsCarbonPollutionPercentage
Namespace Prefix:	fe_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Public Utilities, Adjusted Rate Increase Base Distribution

+ References

No definition available.

+ Details

Name:	fe_PublicUtilitiesAdjustedRateIncreaseBaseDistribution
Namespace Prefix:	fe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Public Utilities, Annual Contribution Amount

+ References

No definition available.

+ Details

Name:	fe_PublicUtilitiesAnnualContributionAmount
Namespace Prefix:	fe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Annual Revenue Cap For DCR Rider

+ References

No definition available.

+ Details

Name:	fe_PublicUtilitiesAnnualRevenueCapForRider
Namespace Prefix:	fe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Public Utilities, Approved Bill Assistance Contribution, Amount

+ References

No definition available.

+ Details

Name:	fe_PublicUtilitiesApprovedBillAssistanceContributionAmount
Namespace Prefix:	fe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Public Utilities, Approved Rate Plan, Period

+ References

No definition available.

+ Details

Name:	fe_PublicUtilitiesApprovedRatePlanPeriod
Namespace Prefix:	fe_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Public Utilities, Expected Cost of Program, Unrecovered Amount

+ References

No definition available.

+ Details

Name:	fe_PublicUtilitiesExpectedCostOfProgramUnrecoveredAmount
Namespace Prefix:	fe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Public Utilities, Grid Modernization Plan, Additional Automation Equipment On Circuits

+ References

No definition available.

+ Details

Name:	fe_PublicUtilitiesGridModernizationPlanAdditionalAutomationEquipmentOnCircuits
Namespace Prefix:	fe_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Public Utilities, Grid Modernization Plan, Additional Numbers Of Meters To Be Installed

+ References

No definition available.

+ Details

Name:	fe_PublicUtilitiesGridModernizationPlanAdditionalNumbersOfMetersToBeInstalled
Namespace Prefix:	fe_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Public Utilities, Grid Modernization Plan, Additional Voltage Regulating Equipment On Circuits

+ References

No definition available.

+ Details

Name:	fe_PublicUtilitiesGridModernizationPlanAdditionalVoltageRegulatingEquipmentOnCircuits
Namespace Prefix:	fe_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Public Utilities, Grid Modernization Plan, Period

+ References

No definition available.

+ Details

Name:	fe_PublicUtilitiesGridModernizationPlanPeriod
Namespace Prefix:	fe_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Public Utilities Rate Increase Base Distribution

+ References

No definition available.

+ Details

Name:	fe_PublicUtilitiesRateIncreaseBaseDistribution
Namespace Prefix:	fe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Public Utilities, Requested Increase In Revenue Cap

+ References

No definition available.

+ Details

Name:	fe_PublicUtilitiesRequestedAnnualIncreaseInRevenueCapDenied
Namespace Prefix:	fe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Public Utilities, Requested Annual Reliability Performance Based Increase In Revenue Cap, Amount

+ References

No definition available.

+ Details

Name:	fe_PublicUtilitiesRequestedAnnualReliabilityPerformanceBasedIncreaseInRevenueCapAmount
Namespace Prefix:	fe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Public Utilities, Requested Rate Increase, Amount Of Capital Investments

+ References

No definition available.

+ Details

Name:	fe_PublicUtilitiesRequestedRateIncreaseAmountOfCapitalInvestments
Namespace Prefix:	fe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Public Utilities, Requested Rate Increase, Amount Of Operations And Maintenance Expenses

+ References

No definition available.

+ Details

Name:	fe_PublicUtilitiesRequestedRateIncreaseAmountOfOperationsAndMaintenanceExpenses
Namespace Prefix:	fe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Public Utilities, Separation Requirements, Number Of Minor Non-Compliance With Requirements

+ References

No definition available.

+ Details

Name:	fe_PublicUtilitiesSeparationRequirementsNumberOfMinorNonComplianceWithRequirements
Namespace Prefix:	fe_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Public Utilities, Separation Requirements, Number Of Requirements Were In Compliance

+ References

No definition available.

+ Details

Name:	fe_PublicUtilitiesSeparationRequirementsNumberOfRequirementsWereInCompliance
Namespace Prefix:	fe_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Regulatory matters.

+ References

No definition available.

+ Details

Name:	fe_RegulatoryMattersLineItems
Namespace Prefix:	fe_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of public utility's approved debt to capital, including debt and equity.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesApprovedDebtCapitalStructurePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of public utility's approved equity to capital, including debt and equity.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesApprovedEquityCapitalStructurePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of public utility's approved return on equity.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesApprovedReturnOnEquityPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=fe_CEIMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=fe_OEMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RegulatoryAgencyAxis=fe_PublicUtilitiesCommissionOfOhioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=fe_CEIOEandTEMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=fe_ESPVMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=stpr_OH
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=fe_DeliveryCapitalRecoveryRiderMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=fe_RegulatedDistributionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=fe_TEMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=fe_EnergyEfficiencyAndPeakDemandReductionStipulationSettlementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=fe_PhaseTwoOfGridModernizationPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=fe_RiderDeliveryCapitalRecoveryAuditReportMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=fe_EnergyConservationEconomicDevelopmentandJobRetentionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

REGULATORY MATTERS - Ohio (Details) meter in Thousands, $ in Thousands									1 Months Ended	12 Months Ended
	Feb. 21, 2025 USD ($)	Dec. 18, 2024 USD ($)	Sep. 30, 2024 USD ($) payment	Jul. 31, 2024 USD ($)	May 31, 2024 USD ($)	Apr. 12, 2024 USD ($) meter	Apr. 05, 2023	Jul. 15, 2022 USD ($) circuit meter	Jan. 31, 2025 USD ($)	Dec. 31, 2024	May 15, 2024 USD ($)	Sep. 13, 2021 requirement	Aug. 06, 2021 USD ($)
CEI
Regulatory Matters [Line Items]
Allowed ROE										10.50%
Allowed debt										51.00%
Approved capital structure										49.00%
MAIT
Regulatory Matters [Line Items]
Allowed ROE										10.50%
Allowed debt										51.00%
Approved capital structure										49.00%
PUCO \| Subsequent Event
Regulatory Matters [Line Items]
Commitment to spend									$ 6,500
PUCO \| Minimum \| Subsequent Event
Regulatory Matters [Line Items]
Amount of revenue increase									37,000
PUCO \| Minimum \| Ohio Companies
Regulatory Matters [Line Items]
Approved rate plan period							8 years
PUCO \| Maximum \| Subsequent Event
Regulatory Matters [Line Items]
Amount of revenue increase									$ 43,000
ESP V \| PUCO \| Ohio Companies
Regulatory Matters [Line Items]
Public utilities, approved bill assistance contribution, amount											$ 32,500
Ohio \| PUCO
Regulatory Matters [Line Items]
Proposed goal to reduce CO2 pollution (percent)		90.00%
Ohio \| DCR Rider \| PUCO
Regulatory Matters [Line Items]
Annual revenue cap for rider		$ 390,000
Annual revenue cap for DCR rider		390,000
Requested increase in revenue cap		15,000
Ohio \| DCR Rider \| PUCO \| CEI \| Distribution
Regulatory Matters [Line Items]
Allowed ROE					10.80%
Allowed debt					44.00%
Approved capital structure					56.00%
Ohio \| DCR Rider \| PUCO \| CEI \| Distribution \| Subsequent Event
Regulatory Matters [Line Items]
Allowed ROE	9.63%
Allowed debt	48.80%
Approved capital structure	51.20%
Ohio \| DCR Rider \| PUCO \| MAIT \| Distribution
Regulatory Matters [Line Items]
Allowed debt					46.00%
Approved capital structure					54.00%
Ohio \| DCR Rider \| PUCO \| TE \| Distribution
Regulatory Matters [Line Items]
Allowed debt					45.00%
Approved capital structure					55.00%
Ohio \| Energy Efficiency and Peak Demand Reduction Stipulation Settlement \| PUCO \| CEI \| Distribution
Regulatory Matters [Line Items]
Increase base distribution rate					$ 94,000
Public utilities, adjusted rate increase base distribution				$ 190,000
Ohio \| Energy Efficiency and Peak Demand Reduction Stipulation Settlement \| PUCO \| CEI \| Distribution \| Subsequent Event
Regulatory Matters [Line Items]
Increase base distribution rate	$ 8,000
Ohio \| Phase Two of Grid Modernization Plan \| PUCO \| Ohio Companies
Regulatory Matters [Line Items]
Numbers of additional meters to be installed \| meter						1,400		700
Number of circuits additional automation equipment to be installed on \| circuit								240
Number of circuits additional voltage regulating equipment to be installed on \| circuit								220
Period of grid modernization plan						4 years		4 years
Requested amount of capital investments						$ 421,000		$ 626,000
Requested amount of operations and maintenance expenses								$ 144,000
Ohio \| Rider Delivery Capital Recovery Audit Report \| PUCO \| Ohio Companies
Regulatory Matters [Line Items]
Refund to customer of pole attachment rates			$ 15										$ 15
Number of minor non-compliance with requirements \| requirement												8
Number of requirements were in compliance \| requirement												23
Loss contingency, payment audit, number of payments examined \| payment			53
Loss contingency, payment audit, total payments in support of Passage of house bill			$ 75,000
Ohio \| Rider Delivery Capital Recovery Audit Report \| PUCO \| Maximum \| Ohio Companies
Regulatory Matters [Line Items]
Loss contingency, payment audit, payments in support of passage of house bill allocated to defendants			$ 5,000
Ohio \| Energy Conservation, Economic Development and Job Retention \| PUCO
Regulatory Matters [Line Items]
Contribution amount		$ 6,390