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Regulatory Matters - Reliability Matters and FERC (Details) $ in Millions | Sep. 30, 2019 USD ($)
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FERC |
Regulatory Matters [Line Items] |
Denied recovery charges of exit fees | $ 78.8

X
- Definition Denied Recovery Charges of Exit Fees + References No definition available. + Details
Name: | fe_DeniedRecoveryChargesOfExitFees
Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Regulatory matters. + References No definition available. + Details
Name: | fe_RegulatoryMattersLineItems
Namespace Prefix: | fe_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=fe_FercMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |