XML 76 R64.htm IDEA: XBRL DOCUMENT v3.5.0.2

Regulatory Matters - Pennsylvania and West Virginia (Details) $ in Thousands						6 Months Ended
	Jul. 07, 2016	Apr. 28, 2016 USD ($)	Oct. 19, 2015 USD ($)	Jun. 19, 2015	Oct. 10, 2013 proposal	Jun. 30, 2016 USD ($) program
Pennsylvania
Regulatory Matters [Line Items]
Number of requests for proposal | proposal					1
Request for proposal project term					2 years
Pennsylvania | Unfavorable Regulatory Action
Regulatory Matters [Line Items]
Maximum range of possible loss						$ 175,000
Pennsylvania | Three month period
Regulatory Matters [Line Items]
Term of energy contract					3 months
Pennsylvania | Twelve month period
Regulatory Matters [Line Items]
Term of energy contract					12 months
Pennsylvania | Twenty-four month period
Regulatory Matters [Line Items]
Term of energy contract					24 months
Pennsylvania | PPUC
Regulatory Matters [Line Items]
LTIIP recovery period			5 years
Pennsylvania | Pennsylvania Companies | Subsequent Event
Regulatory Matters [Line Items]
Requested reinvestment of CTA (percent)	50.00%
Pennsylvania | ME
Regulatory Matters [Line Items]
Amount of requested rate increase (decrease)		$ 140,200
Pennsylvania | ME | PPUC
Regulatory Matters [Line Items]
Demand reduction targets proposed return on equity (percent)				1.80%
Energy consumption reduction targets proposed return on equity (percent)				4.00%
Amount of requested rate increase (decrease)			$ 43,440
Pennsylvania | Penn
Regulatory Matters [Line Items]
Amount of requested rate increase (decrease)		42,000
Pennsylvania | Penn | PPUC
Regulatory Matters [Line Items]
Demand reduction targets proposed return on equity (percent)				1.70%
Energy consumption reduction targets proposed return on equity (percent)				3.30%
Amount of requested rate increase (decrease)			56,350
Pennsylvania | WP
Regulatory Matters [Line Items]
Amount of requested rate increase (decrease)		98,200
Pennsylvania | WP | PPUC
Regulatory Matters [Line Items]
Demand reduction targets proposed return on equity (percent)				1.80%
Energy consumption reduction targets proposed return on equity (percent)				2.60%
Amount of requested rate increase (decrease)			88,340
Pennsylvania | PN
Regulatory Matters [Line Items]
Amount of requested rate increase (decrease)		$ 158,800
Pennsylvania | PN | PPUC
Regulatory Matters [Line Items]
Demand reduction targets proposed return on equity (percent)				0.00%
Energy consumption reduction targets proposed return on equity (percent)				3.90%
Amount of requested rate increase (decrease)			$ 56,740
West Virginia | MP and PE | WVPSC
Regulatory Matters [Line Items]
Number of proposed efficient programs | program						3
Energy efficient reduction requirement (percent)						0.50%
Expenditures for cost recovery program						$ 9,900

X

- Definition

Demand Reduction Targets, Cost Recovery, Proposed Return on Equity

+ References

No definition available.

+ Details

Name:	fe_DemandReductionTargetsCostRecoveryProposedReturnonEquity
Namespace Prefix:	fe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Energy Consumption Reduction Targets, Cost Recovery, Proposed Return on Equity

+ References

No definition available.

+ Details

Name:	fe_EnergyConsumptionReductionTargetsCostRecoveryProposedReturnonEquity
Namespace Prefix:	fe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Energy Contract, Term

+ References

No definition available.

+ Details

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

X

- Definition

Expenditures for cost recovery program.

+ References

No definition available.

+ Details

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

X

- Definition

Number of Requests For Proposal

+ References

No definition available.

+ Details

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

X

- Definition

Public Utilities, Energy Efficient Reduction Requirement, Percent

+ References

No definition available.

+ Details

Name:	fe_PublicUtilitiesEnergyEfficientReductionRequirementPercent
Namespace Prefix:	fe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Public Utilities, Long-term Improvement Plan, Recovery Period

+ References

No definition available.

+ Details

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

X

- Definition

Public Utilities, Number of Proposed Efficient Programs

+ References

No definition available.

+ Details

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

X

- Definition

Public Utilities, Requested Reinvestment of Consolidated Tax Adjustment, Percentage

+ References

No definition available.

+ Details

Name:	fe_PublicUtilitiesRequestedReinvestmentofConsolidatedTaxAdjustmentPercentage
Namespace Prefix:	fe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Regulatory matters.

+ References

No definition available.

+ Details

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

X

- Definition

Request for Proposal, Project Term

+ References

No definition available.

+ Details

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

X

- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

+ Details

Name:	us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of public utility's requested rate increase (decrease) with regulatory agency.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_PA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_UnfavorableRegulatoryActionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	fe_TargetPeriodAxis=fe_ThreeMonthPeriodMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	fe_TargetPeriodAxis=fe_TwelveMonthPeriodMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	fe_TargetPeriodAxis=fe_TwentyFourMonthPeriodMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_WV
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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