XML 148 R130.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Commitments, Guarantees and Contingencies - Nuclear Insurance, Commitments and Collateral (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 06, 2016 | Dec. 31, 2016 USD ($) Nuclear_Power_Plant
Loss Contingencies [Line Items] |  |
Liability assessed with respect to single nuclear incident |  | $ 13,300
Plants licensed to operate | Nuclear_Power_Plant |  | 102
Portion of insurance coverage of private insurer included in single nuclear incident |  | $ 375
Portion of insurance coverage by industry retrospective rating plan |  | 13,000
Losses in excess of private insurance contributed for each nuclear unit license |  | 127
Losses in excess of private insurance contributed for each nuclear unit license per unit |  | 19
Nuclear incidence liability per incident of parent and subsidiary companys based on their present nuclear ownership and leasehold interests |  | 509
Nuclear incident liability not more than in any one year per incident of parent and subsidiary companies based on their present nuclear ownership and leasehold interests |  | 76
Aggregate indemnity |  | $ 1,400
Waiting period |  | 140 days
Coverage of decontamination costs |  | $ 2,750
Insurance coverage for replacement power costs |  | $ 1,060
Environmental plan, submission period |  | 30 days
Outstanding guarantees and other assurances aggregated |  | $ 3,300
FE |  |
Loss Contingencies [Line Items] |  |
Outstanding guarantees and other assurances aggregated |  | 581
Subsidiaries' Guarantees |  |
Loss Contingencies [Line Items] |  |
Outstanding guarantees and other assurances aggregated |  | 1,933
Other Guarantees |  |
Loss Contingencies [Line Items] |  |
Outstanding guarantees and other assurances aggregated |  | 300
Other Assurances |  |
Loss Contingencies [Line Items] |  |
Outstanding guarantees and other assurances aggregated |  | 465
Regulated Distribution |  |
Loss Contingencies [Line Items] |  |
Company posted collateral related to net liability positions |  | 3
NG |  |
Loss Contingencies [Line Items] |  |
Nuclear incidence liability per incident of parent and subsidiary companys based on their present nuclear ownership and leasehold interests |  | 506
Nuclear incident liability not more than in any one year per incident of parent and subsidiary companies based on their present nuclear ownership and leasehold interests |  | 75
Aggregate indemnity |  | $ 1,390
FEV | Signal Peak | Senior Secured Term Loan | Senior Loans | Global Holding |  |
Loss Contingencies [Line Items] |  |
Investment ownership percentage |  | 33.33%
FES |  |
Loss Contingencies [Line Items] |  |
Company posted collateral related to net liability positions |  | $ 190
WMB Marketing Ventures, LLC | Signal Peak | Senior Secured Term Loan | Senior Loans | Global Holding |  |
Loss Contingencies [Line Items] |  |
Investment ownership percentage |  | 33.33%
Global Holding | Senior Secured Term Loan | Senior Loans |  |
Loss Contingencies [Line Items] |  |
Long-term debt and other long-term obligations |  | $ 300
AE Supply |  |
Loss Contingencies [Line Items] |  |
Company posted collateral related to net liability positions |  | $ 4
Revolving Credit Facility | Parent and Certain Subsidiaries |  |
Loss Contingencies [Line Items] |  |
Term of revolving credit facility | 5 years |

X
- Definition Company Posted Collateral Related To Net Liability Positions. + References No definition available. + Details
Name: | fe_CompanyPostedCollateralRelatedToNetLiabilityPositions
Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Coverage of Decontamination Costs As Per Property Damage Insurance + References No definition available. + Details
Name: | fe_CoverageOfDecontaminationCostsAsPerPropertyDamageInsurance
Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Expected Number of Nuclear Power Plant Licensed to Operate + References No definition available. + Details
Name: | fe_ExpectedNumberOfNuclearPowerPlantLicensedToOperate
Namespace Prefix: | fe_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Insurance Coverage For Replacement Power Costs + References No definition available. + Details
Name: | fe_InsuranceCoverageForReplacementPowerCosts
Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Investment, Ownership Percentage Pledged as Collateral + References No definition available. + Details
Name: | fe_InvestmentOwnershipPercentagePledgedAsCollateral
Namespace Prefix: | fe_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Losses in Excess of Private Insurance Contributed for Each Nuclear Unit License + References No definition available. + Details
Name: | fe_LossesInExcessOfPrivateInsuranceContributedForEachNuclearUnitLicense
Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Losses in Excess of Private Insurance Contributed for Each Nuclear Unit License Per Unit + References No definition available. + Details
Name: | fe_LossesInExcessOfPrivateInsuranceContributedForEachNuclearUnitLicensePerUnit
Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Nuclear Incidence Liability Per Incident of Parent and Subsidiary Companys Based On Their Present Nuclear Ownership and Leasehold Interests + References No definition available. + Details
Name: | fe_NuclearIncidenceLiabilityPerIncidentOfParentAndSubsidiaryCompanysBasedOnTheirPresentNuclearOwnershipAndLeaseholdInterests
Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Nuclear Incident Liability Not More Than In Any One Year Per Incident of Parent and Subsidiary Companies Based On Their Present Nuclear Ownership and Leasehold Interests + References No definition available. + Details
Name: | fe_NuclearIncidentLiabilityNotMoreThanInAnyOneYearPerIncidentOfParentAndSubsidiaryCompaniesBasedOnTheirPresentNuclearOwnershipAndLeaseholdInterests
Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Nuclear Insurance Policy, Aggregate Indemnity + References No definition available. + Details
Name: | fe_NuclearInsurancePolicyAggregateIndemnity
Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Nuclear Insurance Policy, Environmental Plan, Submission Period + References No definition available. + Details
Name: | fe_NuclearInsurancePolicyEnvironmentalPlanSubmissionPeriod
Namespace Prefix: | fe_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nuclear Insurance Policy, Indemnification, Waiting Period + References No definition available. + Details
Name: | fe_NuclearInsurancePolicyIndemnificationWaitingPeriod
Namespace Prefix: | fe_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Portion of Insurance Coverage by Industry Retrospective Rating Plan + References No definition available. + Details
Name: | fe_PortionOfInsuranceCoverageByIndustryRetrospectiveRatingPlan
Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Portion of Insurance Coverage of Private Insurer included in Single Nuclear Incident Liability + References No definition available. + Details
Name: | fe_PortionOfInsuranceCoverageOfPrivateInsurerIncludedInSingleNuclearIncidentLiability
Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utilities, Liability Assessed with Respect to Single Nuclear Incident Based On Act + References No definition available. + Details
Name: | fe_PublicUtilitiesLiabilityAssessedwithRespecttoSingleNuclearIncidentBasedOnAct
Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
Name: | us-gaap_GuaranteeObligationsCurrentCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | fe_OutstandingGuaranteesAxis=us-gaap_ParentCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | fe_OutstandingGuaranteesAxis=us-gaap_SubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | fe_OutstandingGuaranteesAxis=us-gaap_GuaranteeTypeOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | fe_OutstandingGuaranteesAxis=fe_OtherAssurancesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=fe_RegulatedDistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fe_FirstEnergyNuclearGenerationLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fe_FevMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | fe_BusinessUnitsAxis=fe_SignalPeakMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=fe_SeniorSecuredTermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=fe_GlobalHoldingMember
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: | dei_LegalEntityAxis=fe_WmbMarketingVenturesLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fe_GlobalHoldingMember
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_ShortTermDebtTypeAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fe_ParentAndCertainSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |