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COMMITMENTS, GUARANTEES AND CONTINGENCIES - Schedule of Potential Amount of Future Payments (Details) - USD ($) $ in Millions	Jul. 15, 2025	Jun. 30, 2025
Guarantor Obligations [Line Items]
Guarantor obligations		$ 1,062
JERSEY CENTRAL POWER & LIGHT COMPANY
Guarantor Obligations [Line Items]
Guarantor obligations		48
FE's Guarantees on Behalf of its Consolidated Subsidiaries
Guarantor Obligations [Line Items]
Guarantor obligations		616
FE’s Guarantees on Other Assurances
Guarantor Obligations [Line Items]
Guarantor obligations		446
Deferred compensation arrangements | FE's Guarantees on Behalf of its Consolidated Subsidiaries
Guarantor Obligations [Line Items]
Guarantor obligations		398
Deferred compensation arrangements | FE’s Guarantees on Other Assurances
Guarantor Obligations [Line Items]
Guarantor obligations		94
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
Guarantor Obligations [Line Items]
Capped portion of surety bond obligations		38
Surety Bonds | Subsequent Event | Signal Peak
Guarantor Obligations [Line Items]
Guarantor obligations	$ 16
Surety Bonds | JERSEY CENTRAL POWER & LIGHT COMPANY
Guarantor Obligations [Line Items]
Capped portion of surety bond obligations		1
Surety Bonds | FE’s Guarantees on Other Assurances
Guarantor Obligations [Line Items]
Guarantor obligations		167
Surety Bonds | FE’s Guarantees on Other Assurances | JERSEY CENTRAL POWER & LIGHT COMPANY
Guarantor Obligations [Line Items]
Guarantor obligations		20
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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+ References

No definition available.

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+ 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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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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