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SHORT-TERM BORROWINGS AND BANK LINES OF CREDIT - Narrative (Details) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 20, 2023 USD ($) | Oct. 18, 2021 USD ($) agreement | Dec. 31, 2023 USD ($) | Dec. 31, 2021 | Dec. 31, 2022 USD ($)
Short-term Debt [Line Items] |  |  |  |  |
Short-term debt, weighted average interest rate, at point in time |  |  | 6.96% |  | 3.93%
Short-term borrowings |  |  | $ 775,000,000 |  | $ 100,000,000
Minimum | Available for Issuance of Letters of Credit |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Cross-default provision for other indebtedness |  |  | $ 100,000,000 |  |
Maximum | Money Pool |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Debt term |  |  | 364 days |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Maximum amount borrowed under revolving credit facility | $ 1,000,000,000.0 | $ 4,500,000,000 |  |  |
Line of credit facility, remaining borrowing capacity |  |  | $ 5,000,000,000 |  |
Number of agreements | agreement |  | 6 |  |  |
Revolving Credit Facility | Line of Credit | Parent, FET, the Utilities and the Transmission Companies |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Debt term |  | 5 years |  |  |
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 | 500,000,000 |  |  |  |
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 |  |  |  |
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 |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Maximum amount borrowed under revolving credit facility | $ 1,000,000,000.0 |  |  |  |
Revolving Credit Facility | Line of Credit | Minimum | FET, the Utilities and the Transmission Companies |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Consolidated debt to total capitalization ratio (percent) |  |  |  | 65.00% |
Revolving Credit Facility | Line of Credit | Maximum | Parent, FET, the Utilities and the Transmission Companies |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Debt term |  |  |  | 364 days |
Revolving Credit Facility | Line of Credit | Maximum | FET, the Utilities and the Transmission Companies |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Consolidated debt to total capitalization ratio (percent) |  |  |  | 75.00% |
Letter of Credit | Line of Credit |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Debt term |  |  | 1 year |  |
Letter of Credit | Line of Credit | FE |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Outstanding borrowings |  |  | $ 4,000,000 |  |

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