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SHORT-TERM BORROWINGS AND BANK LINES OF CREDIT - Schedule of Interest Rate (Details)	Dec. 31, 2024	Dec. 31, 2023
Regulated Companies’ Money Pool
Short-term Debt [Line Items]
Average Interest Rates	5.74%	6.30%
Unregulated Companies’ Money Pool
Short-term Debt [Line Items]
Average Interest Rates	6.44%	6.01%

X

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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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

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=fe_UnregulatedCompaniesMoneyPoolMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: