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COMMITMENTS, GUARANTEES AND CONTINGENCIES - Schedule of Potential Amount of Future Payments (Details) $ in Millions	Sep. 30, 2025 USD ($)
Guarantor Obligations [Line Items]
Guarantor obligations	$ 1,051
JERSEY CENTRAL POWER & LIGHT COMPANY
Guarantor Obligations [Line Items]
Guarantor obligations	46
FE’s Guarantees on Behalf of its Consolidated Subsidiaries
Guarantor Obligations [Line Items]
Guarantor obligations	615
FE’s Guarantees on Other Assurances
Guarantor Obligations [Line Items]
Guarantor obligations	436
Deferred compensation arrangements | FE’s Guarantees on Behalf of its Consolidated Subsidiaries
Guarantor Obligations [Line Items]
Guarantor obligations	397
Deferred compensation arrangements | FE’s Guarantees on Other Assurances
Guarantor Obligations [Line Items]
Guarantor obligations	93
Vehicle leases | FE’s Guarantees on Behalf of its Consolidated Subsidiaries
Guarantor Obligations [Line Items]
Guarantor obligations	75
McElroy Run transfer | FE’s Guarantees on Behalf of its Consolidated Subsidiaries
Guarantor Obligations [Line Items]
Guarantor obligations	129
Other | FE’s Guarantees on Behalf of its Consolidated Subsidiaries
Guarantor Obligations [Line Items]
Guarantor obligations	14
Surety Bonds | FE’s Guarantees on Other Assurances
Guarantor Obligations [Line Items]
Guarantor obligations	158
Surety Bonds | FE’s Guarantees on Other Assurances | JERSEY CENTRAL POWER & LIGHT COMPANY
Guarantor Obligations [Line Items]
Guarantor obligations	18
LOCs | FE’s Guarantees on Other Assurances
Guarantor Obligations [Line Items]
Guarantor obligations	185
LOCs | FE’s Guarantees on Other Assurances | JERSEY CENTRAL POWER & LIGHT COMPANY
Guarantor Obligations [Line Items]
Guarantor obligations	$ 28

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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

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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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