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COMMITMENTS, GUARANTEES AND CONTINGENCIES - Schedule of Potential Collateral Obligations (Details) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($)
Guarantor Obligations [Line Items]
Percent of face amount of debt	100.00%
Curing period	30 days
JERSEY CENTRAL POWER & LIGHT COMPANY
Guarantor Obligations [Line Items]
Percent of face amount of debt	100.00%
Curing period	30 days
Total Exposure from Contractual Obligations
Guarantor Obligations [Line Items]
Potential Collateral Obligations	$ 354
Total Exposure from Contractual Obligations | JERSEY CENTRAL POWER & LIGHT COMPANY
Guarantor Obligations [Line Items]
Potential Collateral Obligations	75
Total Exposure from Contractual Obligations | FE
Guarantor Obligations [Line Items]
Potential Collateral Obligations	154
Total Exposure from Contractual Obligations | Electric Companies and Transmission Companies
Guarantor Obligations [Line Items]
Potential Collateral Obligations	200
Upon downgrade
Guarantor Obligations [Line Items]
Potential Collateral Obligations	91
Upon downgrade | JERSEY CENTRAL POWER & LIGHT COMPANY
Guarantor Obligations [Line Items]
Potential Collateral Obligations	58
Upon downgrade | FE
Guarantor Obligations [Line Items]
Potential Collateral Obligations	1
Upon downgrade | Electric Companies and Transmission Companies
Guarantor Obligations [Line Items]
Potential Collateral Obligations	90
Surety bonds (collateralized amount)
Guarantor Obligations [Line Items]
Potential Collateral Obligations	$ 263
Percent of face amount of debt	60.00%
Capped portion of surety bond obligations	$ 22
Surety bonds (collateralized amount) | JERSEY CENTRAL POWER & LIGHT COMPANY
Guarantor Obligations [Line Items]
Potential Collateral Obligations	$ 17
Percent of face amount of debt	60.00%
Capped portion of surety bond obligations	$ 1
Surety bonds (collateralized amount) | FE
Guarantor Obligations [Line Items]
Potential Collateral Obligations	153
Surety bonds (collateralized amount) | Electric Companies and Transmission Companies
Guarantor Obligations [Line Items]
Potential Collateral Obligations	$ 110

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-4

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
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-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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