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Regulatory Matters - Reliability Matters and FERC (Details) $ in Millions	Sep. 30, 2019 USD ($)
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: