XML 68 R51.htm IDEA: XBRL DOCUMENT v3.20.4

DISCONTINUED OPERATIONS - Narrative (Details) $ in Millions		1 Months Ended	3 Months Ended
	Feb. 27, 2020 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Feb. 20, 2020 USD ($)	Dec. 31, 2018 MW
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Worthless stock deduction	$ 4,900
Unrecognized tax benefits from worthless stock deduction	316
Worthless stock deduction, net of tax	1,100
Unrecognized tax benefits from worthless stock deduction, net of tax	72
Adjustments related to intercompany tax sharing			$ 12	$ 6
Disposal Group, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from asset sales					$ 65
State and Local
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Worthless stock deduction, net of tax	80
AE Supply | Purchase Agreement with Subsidiary of LS Power | Pleasants Power Station
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Plant generation capacity (in MW's) | MW							1,300
IT Access Agreement | Affiliated companies | FES
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amount paid to settle claims	$ 125					$ 125
FES Key Creditor Groups | Affiliated companies | FES
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amount paid to settle claims						$ 853
Debtor Reorganization Items, Discharge of Claims and Liabilities		$ 853

X

- Definition

Discontinued Operation, Tax Effect of Discontinued Operation, Adjustments Related to Intercompany Tax Sharing

+ References

No definition available.

+ Details

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

X

- Definition

Disposal Group, Including Discontinued Operation, Worthless Stock Deduction

+ References

No definition available.

+ Details

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

X

- Definition

Disposal Group, Including Discontinued Operation, Worthless Stock Deduction, Net of Tax

+ References

No definition available.

+ Details

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

X

- Definition

Plant Capacity

+ References

No definition available.

+ Details

Name:	fe_PlantCapacity
Namespace Prefix:	fe_
Data Type:	num:powerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Unrecognized Tax Benefits, Increase Resulting from Change in Worthless Stock Deduction Reserve, Gross

+ References

No definition available.

+ Details

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

X

- Definition

Unrecognized Tax Benefits, Increase Resulting from Change in Worthless Stock Deduction Reserve, Net of Tax

+ References

No definition available.

+ Details

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

X

- Definition

Amount paid to settle bankruptcy claim.

+ References

No definition available.

+ Details

Name:	us-gaap_BankruptcyClaimsAmountPaidToSettleClaims
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of reorganization items related to discharge of claims and liabilities upon emergence from bankruptcy.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 55
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56145-112766

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 45
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=116635682&loc=d3e55730-112764

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The cash inflow from the sale of formerly productive land held for sale, anything permanently fixed to it, including buildings, structures on it, and so forth.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585

+ Details

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

X

- Details

Name:	us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=us-gaap_StateAndLocalJurisdictionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=fe_PurchaseAgreementwithSubsidiaryofLSPowerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PublicUtilityAxis=fe_PleasantsPowerStationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=fe_ITAccessAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_AffiliatedEntityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=fe_FESKeyCreditorGroupsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: