XML 65 R45.htm IDEA: XBRL DOCUMENT
v3.24.3

FAIR VALUE MEASUREMENTS - Schedule of Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Liabilities |  |
Restricted cash | $ 26 | $ 42
Recurring |  |
Assets |  |
Total assets | 800 | 500
Liabilities |  |
Total liabilities | 1 | 1
Net assets | 799 | 499
Recurring | Derivative Liabilities | Derivative assets FTRs |  |
Liabilities |  |
Total liabilities | 1 | 1
Level 1 | Recurring |  |
Assets |  |
Total assets | 467 | 181
Liabilities |  |
Total liabilities | 0 | 0
Net assets | 467 | 181
Level 1 | Recurring | Derivative Liabilities | Derivative assets FTRs |  |
Liabilities |  |
Total liabilities | 0 | 0
Level 2 | Recurring |  |
Assets |  |
Total assets | 324 | 315
Liabilities |  |
Total liabilities | 0 | 0
Net assets | 324 | 315
Level 2 | Recurring | Derivative Liabilities | Derivative assets FTRs |  |
Liabilities |  |
Total liabilities | 0 | 0
Level 3 | Recurring |  |
Assets |  |
Total assets | 9 | 4
Liabilities |  |
Total liabilities | 1 | 1
Net assets | 8 | 3
Level 3 | Recurring | Derivative Liabilities | Derivative assets FTRs |  |
Liabilities |  |
Total liabilities | 1 | 1
Derivative assets FTRs | Recurring | Derivative Assets |  |
Assets |  |
Total assets | 9 | 4
Derivative assets FTRs | Level 1 | Recurring | Derivative Assets |  |
Assets |  |
Total assets | 0 | 0
Derivative assets FTRs | Level 2 | Recurring | Derivative Assets |  |
Assets |  |
Total assets | 0 | 0
Derivative assets FTRs | Level 3 | Recurring | Derivative Assets |  |
Assets |  |
Total assets | 9 | 4
Equity securities | Recurring |  |
Assets |  |
Total assets | 2 | 2
Equity securities | Level 1 | Recurring |  |
Assets |  |
Total assets | 2 | 2
Equity securities | Level 2 | Recurring |  |
Assets |  |
Total assets | 0 | 0
Equity securities | Level 3 | Recurring |  |
Assets |  |
Total assets | 0 | 0
U.S. state and municipal debt securities | Recurring |  |
Assets |  |
Total assets | 277 | 275
U.S. state and municipal debt securities | Level 1 | Recurring |  |
Assets |  |
Total assets | 0 | 0
U.S. state and municipal debt securities | Level 2 | Recurring |  |
Assets |  |
Total assets | 277 | 275
U.S. state and municipal debt securities | Level 3 | Recurring |  |
Assets |  |
Total assets | 0 | 0
Cash, cash equivalents and restricted cash | Recurring |  |
Assets |  |
Total assets | 465 | 179
Cash, cash equivalents and restricted cash | Level 1 | Recurring |  |
Assets |  |
Total assets | 465 | 179
Cash, cash equivalents and restricted cash | Level 2 | Recurring |  |
Assets |  |
Total assets | 0 | 0
Cash, cash equivalents and restricted cash | Level 3 | Recurring |  |
Assets |  |
Total assets | 0 | 0
Other | Recurring |  |
Assets |  |
Total assets | 47 | 40
Other | Level 1 | Recurring |  |
Assets |  |
Total assets | 0 | 0
Other | Level 2 | Recurring |  |
Assets |  |
Total assets | 47 | 40
Other | Level 3 | Recurring |  |
Assets |  |
Total 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 Fair value portion of asset recognized for present right to economic benefit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + 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://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + 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
- Definition Amount of cash restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-8 + Details
Name: | us-gaap_RestrictedCashCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
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_FtrsMember
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: |

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_CashCashEquivalentsAndRestrictedCashMember
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: |