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Short-Term Borrowings and Bank Lines of Credit - Narrative (Details) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 19, 2018 USD ($) agreement | Dec. 31, 2019 USD ($) agreement | Sep. 11, 2019 USD ($) agreement | Dec. 31, 2018 USD ($)
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |  |
Short-term borrowings |  | $ 1,000,000,000 |  | $ 1,250,000,000
Average interest rate for borrowings |  | 2.88% |  | 3.07%
Maximum | Affiliates |  |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |  |
Term of revolving credit facility |  | 364 days |  |
Term Loan |  |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |  |
Outstanding borrowings | $ 1,750,000,000 |  |  |
Term Loan | Federal Funds Rate |  |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |  |
Spread on variable rate | 0.50% |  |  |
Term Loan | LIBOR |  |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |  |
Spread on variable rate | 1.00% |  |  |
Term Loan | $1.25B Term Loan |  |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |  |
Number of agreements | agreement | 2 |  | 2 |
Term of revolving credit facility | 364 days |  |  |
Face amount of loan | $ 1,250,000,000 |  |  |
Term Loan | $500M Term Loan |  |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |  |
Term of revolving credit facility | 2 years |  |  |
Face amount of loan | $ 500,000,000 |  |  |
Term Loan | $1B Term Loan |  |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |  |
Face amount of loan |  |  | $ 1,000,000,000 |
Term Loan | $750M Term Loan |  |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |  |
Face amount of loan |  |  | $ 750,000,000 |
FET | Minimum |  |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |  |
Consolidated debt to total capitalization ratio (percent) |  | 65.00% |  |
FET | Maximum |  |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |  |
Consolidated debt to total capitalization ratio (percent) |  | 75.00% |  |
Revolving Credit Facility | Line of Credit |  |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |  |
Number of agreements | agreement |  | 2 |  |
Maximum amount borrowed under revolving credit facility |  | $ 3,500,000,000 |  |
Revolving Credit Facility | Parent, the Utilities, FET and Certain Subsidiaries | Line of Credit |  |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |  |
Term of revolving credit facility |  | 5 years |  |
Revolving Credit Facility | FET | Line of Credit |  |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 1,000,000,000 |  |
Line of Credit | FE and the Utilities |  |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 4,000,000 |  |
Line of Credit | Letter of Credit |  |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |  |
Term of revolving credit facility |  | 1 year |  |
Line of Credit | Letter of Credit | FET |  |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |  |
Maximum amount borrowed under revolving credit facility |  | $ 100,000,000 |  |
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 |  |
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% |  |
Money Pool | Unregulated Companies |  |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |  |
Average interest rate for borrowings |  | 2.74% |  |
FE | Revolving Credit Facility | Line of Credit |  |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |  |
Maximum amount borrowed under revolving credit facility |  | $ 2,500,000,000 |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | 2,496,000,000 |  |
FE | Line of Credit | Letter of Credit |  |  |  |
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract] |  |  |  |
Maximum amount borrowed under revolving credit facility |  | 250,000,000 |  |
FET Sub-limits | Revolving Credit Facility | 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 |  |

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