XML 98 R81.htm IDEA: XBRL DOCUMENT v3.20.4

FAIR VALUE MEASUREMENTS - Recurring Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Liabilities
Investment excludes receivables, payables and accrued income	$ 1	$ (16)
Recurring
Assets
Fair value, assets	2,056	1,828
Liabilities
Fair value, liabilities	0	(17)
Net assets (liabilities)	2,056	1,811
Recurring | FTRs | Derivative Liabilities
Liabilities
Fair value, liabilities	0	(1)
Recurring | NUG contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	0	(16)
Recurring | Corporate debt securities
Assets
Fair value, assets	0	135
Recurring | FTRs | Derivative Assets
Assets
Fair value, assets	3	4
Recurring | Equity securities
Assets
Fair value, assets	2	2
Recurring | U.S. state debt securities
Assets
Fair value, assets	276	271
Recurring | Other
Assets
Fair value, assets	1,775	1,416
Recurring | Level 1
Assets
Fair value, assets	1,736	629
Liabilities
Fair value, liabilities	0	0
Net assets (liabilities)	1,736	629
Recurring | Level 1 | FTRs | Derivative Liabilities
Liabilities
Fair value, liabilities	0	0
Recurring | Level 1 | NUG contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	0	0
Recurring | Level 1 | Corporate debt securities
Assets
Fair value, assets	0	0
Recurring | Level 1 | FTRs | Derivative Assets
Assets
Fair value, assets	0	0
Recurring | Level 1 | Equity securities
Assets
Fair value, assets	2	2
Recurring | Level 1 | U.S. state debt securities
Assets
Fair value, assets	0	0
Recurring | Level 1 | Other
Assets
Fair value, assets	1,734	627
Recurring | Level 2
Assets
Fair value, assets	317	1,195
Liabilities
Fair value, liabilities	0	0
Net assets (liabilities)	317	1,195
Recurring | Level 2 | FTRs | Derivative Liabilities
Liabilities
Fair value, liabilities	0	0
Recurring | Level 2 | NUG contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	0	0
Recurring | Level 2 | Corporate debt securities
Assets
Fair value, assets	0	135
Recurring | Level 2 | FTRs | Derivative Assets
Assets
Fair value, assets	0	0
Recurring | Level 2 | Equity securities
Assets
Fair value, assets	0	0
Recurring | Level 2 | U.S. state debt securities
Assets
Fair value, assets	276	271
Recurring | Level 2 | Other
Assets
Fair value, assets	41	789
Recurring | Level 3
Assets
Fair value, assets	3	4
Liabilities
Fair value, liabilities	0	(17)
Net assets (liabilities)	3	(13)
Recurring | Level 3 | FTRs | Derivative Liabilities
Liabilities
Fair value, liabilities	0	(1)
Recurring | Level 3 | NUG contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	0	(16)
Recurring | Level 3 | Corporate debt securities
Assets
Fair value, assets	0	0
Recurring | Level 3 | FTRs | Derivative Assets
Assets
Fair value, assets	3	4
Recurring | Level 3 | Equity securities
Assets
Fair value, assets	0	0
Recurring | Level 3 | U.S. state debt securities
Assets
Fair value, assets	0	0
Recurring | Level 3 | Other
Assets
Fair value, assets	$ 0	$ 0

X

- Definition

Fair value of assets and liabilities net.

+ References

No definition available.

+ Details

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

X

- Definition

Investments excludes receivables payables deferred taxes and accrued income.

+ References

No definition available.

+ Details

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

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=fe_FtrsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=fe_DerivativeLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=fe_NonUtilityGenerationContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=fe_FtrsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=fe_DerivativeAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=fe_OtherSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: