XML 93 R78.htm IDEA: XBRL DOCUMENT
v3.22.4

FAIR VALUE MEASUREMENTS - Proceeds from the Sale of Investments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Fair Value Disclosures [Abstract] |  |  |
Sale Proceeds | $ 48 | $ 48 | $ 186
Realized Gains | 8 | 0 | 12
Realized Losses | (13) | (3) | (8)
Interest and Dividend Income | $ 11 | $ 11 | $ 22

X
- Definition Debt and Equity Securities, Realized Gain (Loss), Sales Proceeds + References No definition available. + Details
Name: | fe_DebtandEquitySecuritiesRealizedGainLossSalesProceeds
Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Debt and Equity Securities, Realized Gains + References No definition available. + Details
Name: | fe_DebtandEquitySecuritiesRealizedGains
Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Debt and Equity Securities, Realized Losses + References No definition available. + Details
Name: | fe_DebtandEquitySecuritiesRealizedLosses
Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Investment Income From Trusts + References No definition available. + Details
Name: | fe_InvestmentIncomeFromTrusts
Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration