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SHORT-TERM BORROWINGS AND BANK LINES OF CREDIT - Narrative (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 24, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2021 | Oct. 23, 2024
Short-term Debt [Line Items] |  |  |  |  |
Short-term borrowings |  | $ 550,000,000 | $ 775,000,000 |  |
Short-term debt, weighted average interest rate, at point in time (percent) |  | 7.10% | 6.96% |  |
Maximum | Money Pool |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Debt term |  | 364 days |  |  |
Minimum | Available for Issuance of Letters of Credit |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Cross-default provision for other indebtedness |  | $ 100,000,000 |  |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Maximum amount borrowed under revolving credit facility | $ 1,000,000,000.0 |  |  |  |
Available liquidity |  | 5,300,000,000 |  |  |
Revolving Credit Facility | Line of Credit | FE |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Debt term | 1 year |  |  |  |
Maximum amount borrowed under revolving credit facility | $ 750,000,000 |  |  |  | $ 500,000,000
Revolving Credit Facility | Line of Credit | FET |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Maximum amount borrowed under revolving credit facility | 1,000,000,000.0 |  |  |  |
Revolving Credit Facility | Line of Credit | Ohio Companies |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Maximum amount borrowed under revolving credit facility | 800,000,000 |  |  |  |
Revolving Credit Facility | Line of Credit | Pennsylvania Companies |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Maximum amount borrowed under revolving credit facility | 950,000,000 |  |  |  |
Revolving Credit Facility | Line of Credit | JCP&L |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Maximum amount borrowed under revolving credit facility | 750,000,000 |  |  |  |
Revolving Credit Facility | Line of Credit | MP and PE |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Maximum amount borrowed under revolving credit facility | 400,000,000 |  |  |  |
Revolving Credit Facility | Line of Credit | Transmission companies |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Maximum amount borrowed under revolving credit facility | 850,000,000 |  |  |  |
Revolving Credit Facility | Line of Credit | KATCo |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Maximum amount borrowed under revolving credit facility | $ 150,000,000 |  |  |  |
Revolving Credit Facility | Line of Credit | Parent, FET, the Utilities and the Transmission Companies | Maximum |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Debt term |  |  |  | 364 days |
Revolving Credit Facility | Line of Credit | FET, the Utilities and the Transmission Companies |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Coverage ratio |  |  |  | 250.00% |
Revolving Credit Facility | Line of Credit | FET, the Utilities and the Transmission Companies | Maximum |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Consolidated debt to total capitalization ratio (percent) |  |  |  | 75.00% |
Revolving Credit Facility | Line of Credit | FET, the Utilities and the Transmission Companies | Minimum |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Consolidated debt to total capitalization ratio (percent) |  |  |  | 65.00% |
Letter of Credit | Line of Credit |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Debt term |  |  | 1 year |  |
Outstanding borrowings |  | 170,000,000 |  |  |
Letter of Credit | FE | Line of Credit |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Letters of credit outstanding, amount |  | $ 139,000,000 |  |  |

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