Noncontrolling Interest, Ownership Percentage Sold

No definition available.

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- Definition

Number of long term power purchase agreements maintained by parent company with Non utility generation entities.

+ References

No definition available.

+ Details

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

- Definition

Number of variable interest contracts.

+ References

No definition available.

+ Details

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

- Definition

Reserve For Adverse Purchase Power Commitment, Pretax Loss

+ References

No definition available.

+ Details

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

- Definition

Variable Interest Entities, Percentage of Equity Interest by Unaffiliated Third Party Included in Ownership of Entity Three

+ References

No definition available.

+ Details

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

- Definition

Variable Interest Entities, Percentage Of Equity Interest Held By Wholly Owned Subsidiary Of Entity Four

+ References

No definition available.

+ Details

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

- Definition

Variable interest entities percentage of high voltage transmission line project owned By variable interest entity one in joint venture party one.

+ References

No definition available.

+ Details

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

- Definition

Variable Interest Entities Percentage of high voltage transmission line project owned By variable interest entity one in joint venture party two.

+ References

No definition available.

+ Details

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

- Details

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

- Definition

All amounts that, per contract, are due to the servicer in exchange for servicing the financial asset and would no longer be received by a servicer if the beneficial owners of the serviced assets (or their trustees or agents) were to exercise their actual or potential authority under the contract to shift the servicing to another servicer. Depending on the servicing contract, those fees may include some or all of the difference between the interest rate collected on the asset being serviced and the rate to be paid to the beneficial owners of the asset.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122596-111746

+ Details

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

- Definition

Cost of electricity purchased as well as fuel used to generate electricity used in operations and sold during the reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2(b))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

Name:	us-gaap_CostOfPurchasedPower
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Nominal mass used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeNonmonetaryNotionalAmountMass
Namespace Prefix:	us-gaap_
Data Type:	num:massItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	dei_LegalEntityAxis=fe_FevMember
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:	dei_LegalEntityAxis=fe_OhioFundingCompaniesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

Name:	fe_BusinessUnitsAxis=fe_SignalPeakMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	fe_PowerPurchaseAgreementsAxis=fe_PowerPurchaseAgreementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_PutOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=fe_GlobalHoldingMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=fe_PathWvMember
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Variable Interest Entities (Details Textuals) (USD $)	12 Months Ended
Variable Interest Entities (Details Textuals) (USD $)	Dec. 31, 2014 entity	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011 T
Variable Interest Entities (Textuals) [Abstract]
Equity interest by unaffiliated third party in PNBV	3.00%
Number of contracts that may contain variable interest	2fe_NumberOfVariableInterestContracts
Purchased power	$ 4,716,000,000us-gaap_CostOfPurchasedPower	$ 3,963,000,000us-gaap_CostOfPurchasedPower	$ 4,246,000,000us-gaap_CostOfPurchasedPower
Power Purchase Agreements
Variable Interest Entities (Textuals) [Abstract]
Number of long-term power purchase agreements maintained by FirstEnergy with NUG entities	17
Path-WV
Variable Interest Entities (Textuals) [Abstract]
Percentage of high-voltage transmission line project owned by subsidiary of AE on the Allegheny Series	100.00%
Percentage of high-voltage transmission line project owned by subsidiary of AE on the West Virginia Series	50.00%
Signal Peak
Variable Interest Entities (Textuals) [Abstract]
Ownership percentage sold				16.70%
FEV \| Signal Peak
Variable Interest Entities (Textuals) [Abstract]
Ownership percentage by parent				50.00%
OE
Variable Interest Entities (Textuals) [Abstract]
Equity interest by OES Ventures in PNBV	3.00%
Other FE subsidiaries
Variable Interest Entities (Textuals) [Abstract]
Ownership interest	0.00%
Other FE subsidiaries \| Power Purchase Agreements
Variable Interest Entities (Textuals) [Abstract]
Purchased power	185,000,000
Ohio Funding Companies
Variable Interest Entities (Textuals) [Abstract]
Aggregate Annual Servicing Fees Receivable For Phase-in Recovery Bonds	445,000
WP \| Power Purchase Agreements
Variable Interest Entities (Textuals) [Abstract]
Reserve For Adverse Purchase Power Commitment, Pretax Loss		$ 17,000,000
Global Holding \| FEV \| Signal Peak
Variable Interest Entities (Textuals) [Abstract]
Ownership interest	33.33%
Put Option [Member] \| FEV \| Signal Peak
Variable Interest Entities (Textuals) [Abstract]
Investment Owned, Balance, Other Measure				2,000,000