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COMMITMENTS, GUARANTEES AND CONTINGENCIES - Potential Amount of Future Payments (Details) $ in Millions	Dec. 31, 2024 USD ($)
Guarantor Obligations [Line Items]
Total Guarantees and Other Assurances	$ 923
FE's Guarantees on Behalf of its Consolidated Subsidiaries
Guarantor Obligations [Line Items]
Total Guarantees and Other Assurances	495
FE's Guarantees on Other Assurances
Guarantor Obligations [Line Items]
Total Guarantees and Other Assurances	428
Deferred compensation arrangements | FE's Guarantees on Behalf of its Consolidated Subsidiaries
Guarantor Obligations [Line Items]
Total Guarantees and Other Assurances	406
Deferred compensation arrangements | FE's Guarantees on Other Assurances
Guarantor Obligations [Line Items]
Total Guarantees and Other Assurances	97
Vehicle leases | FE's Guarantees on Behalf of its Consolidated Subsidiaries
Guarantor Obligations [Line Items]
Total Guarantees and Other Assurances	75
Other | FE's Guarantees on Behalf of its Consolidated Subsidiaries
Guarantor Obligations [Line Items]
Total Guarantees and Other Assurances	14
Surety Bonds
Guarantor Obligations [Line Items]
Total Guarantees and Other Assurances	146
Surety Bonds | FE's Guarantees on Other Assurances
Guarantor Obligations [Line Items]
Total Guarantees and Other Assurances	161
LOCs | FE's Guarantees on Other Assurances
Guarantor Obligations [Line Items]
Total Guarantees and Other Assurances	$ 170

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

+ Details

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

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