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SHORT-TERM BORROWINGS AND BANK LINES OF CREDIT - Narrative (Details) |  | 12 Months Ended
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Oct. 18, 2021 USD ($) agreement | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |
Short-term borrowings |  | $ 100,000,000 | $ 0
Average interest rate for borrowings |  | 3.93% | 2.42%
Revolving Credit Facility | Line of Credit |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |
Number of agreements | agreement | 6 |  |
Maximum amount borrowed under revolving credit facility | $ 4,500,000,000 |  |
Revolving Credit Facility | Parent, FET, the Utilities and the Transmission Companies | Line of Credit |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |
Term of revolving credit facility | 5 years |  |
Revolving Credit Facility | Parent, FET, the Utilities and the Transmission Companies | Line of Credit | Maximum |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |
Term of revolving credit facility |  |  | 364 days
Revolving Credit Facility | Parent and FET | Line of Credit |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |
Maximum amount borrowed under revolving credit facility | $ 1,000,000,000.0 |  |
Revolving Credit Facility | Ohio Companies | Line of Credit |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |
Maximum amount borrowed under revolving credit facility | 800,000,000 |  |
Revolving Credit Facility | Pennsylvania Companies | Line of Credit |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |
Maximum amount borrowed under revolving credit facility | 950,000,000 |  |
Revolving Credit Facility | JCP&L | Line of Credit |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |
Maximum amount borrowed under revolving credit facility | 500,000,000 |  |
Revolving Credit Facility | MP and PE | Line of Credit |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |
Maximum amount borrowed under revolving credit facility | 400,000,000 |  |
Revolving Credit Facility | Transmission companies | Line of Credit |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |
Maximum amount borrowed under revolving credit facility | $ 850,000,000 |  |
Revolving Credit Facility | FET, the Utilities and the Transmission Companies | Line of Credit |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |
Coverage ratio |  |  | 250.00%
Revolving Credit Facility | FET, the Utilities and the Transmission Companies | Line of Credit | Minimum |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |
Consolidated debt to total capitalization ratio (percent) |  |  | 65.00%
Revolving Credit Facility | FET, the Utilities and the Transmission Companies | Line of Credit | Maximum |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |
Consolidated debt to total capitalization ratio (percent) |  |  | 75.00%
Line of Credit | Letter of Credit |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |
Term of revolving credit facility |  | 1 year |
Money Pool | Maximum |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |
Term of revolving credit facility |  | 364 days |
Money Pool | Regulated Companies |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |
Average interest rate for borrowings |  | 2.27% | 1.01%
Money Pool | Unregulated Companies |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |
Average interest rate for borrowings |  | 2.14% | 0.60%
Available for Issuance of Letters of Credit | Minimum |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |
Cross-default provision for other indebtedness |  | $ 100,000,000 |
FE | Line of Credit | Letter of Credit |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |
Outstanding borrowings |  | $ 4,000,000 |

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