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COMMITMENTS, GUARANTEES AND CONTINGENCIES - Schedule of Potential Collateral Obligations (Details) $ in Millions	6 Months Ended
	Jun. 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
Credit Rating Contractual Obligations
Guarantor Obligations [Line Items]
Potential Collateral Obligations	$ 370
Credit Rating Contractual Obligations | JERSEY CENTRAL POWER & LIGHT COMPANY
Guarantor Obligations [Line Items]
Potential Collateral Obligations	91
Credit Rating Contractual Obligations | FE
Guarantor Obligations [Line Items]
Potential Collateral Obligations	163
Credit Rating Contractual Obligations | Electric Companies and Transmission Companies
Guarantor Obligations [Line Items]
Potential Collateral Obligations	207
Upon downgrade
Guarantor Obligations [Line Items]
Potential Collateral Obligations	104
Upon downgrade | JERSEY CENTRAL POWER & LIGHT COMPANY
Guarantor Obligations [Line Items]
Potential Collateral Obligations	71
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	103
Surety Bond (Collateralized Amount)
Guarantor Obligations [Line Items]
Potential Collateral Obligations	$ 266
Percent of face amount of debt	60.00%
Capped portion of surety bond obligations	$ 38
Surety Bond (Collateralized Amount) | JERSEY CENTRAL POWER & LIGHT COMPANY
Guarantor Obligations [Line Items]
Potential Collateral Obligations	$ 20
Percent of face amount of debt	60.00%
Capped portion of surety bond obligations	$ 1
Surety Bond (Collateralized Amount) | FE
Guarantor Obligations [Line Items]
Potential Collateral Obligations	162
Surety Bond (Collateralized Amount) | Electric Companies and Transmission Companies
Guarantor Obligations [Line Items]
Potential Collateral Obligations	$ 104

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
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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
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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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-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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