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SHORT-TERM BORROWINGS AND BANK LINES OF CREDIT - Narrative (Details)		12 Months Ended
	Nov. 23, 2020 USD ($)	Dec. 31, 2020 USD ($) agreement	Nov. 17, 2020 USD ($)	Dec. 31, 2019 USD ($)
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract]
Short-term borrowings		$ 2,200,000,000		$ 1,000,000,000
Average interest rate for borrowings		1.86%		2.88%
Maximum | Affiliates
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract]
Term of revolving credit facility		364 days
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	$ 0
Revolving Credit Facility | FE and the regulated distribution subsidiaries | Line of Credit
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract]
Proceeds from lines of credit	950,000,000
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
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		0.89%
Money Pool | Unregulated Companies
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract]
Average interest rate for borrowings		1.19%
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 | 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	$ 1,500,000,000
Outstanding borrowings	1,200,000,000
Line of credit facility, remaining borrowing capacity	1,300,000,000
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
Proceeds from lines of credit	1,000,000,000
Outstanding borrowings	$ 1,000,000,000

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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