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COMMITMENTS, GUARANTEES AND CONTINGENCIES - Potential Collateral Obligations (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Guarantor Obligations [Line Items]
Potential additional collateral obligations	$ 923
Percent of face amount of debt	100.00%
Curing period	30 days
Credit Risk Contractual Obligation
Guarantor Obligations [Line Items]
Potential additional collateral obligations	$ 224
Credit Risk Contractual Obligation | FE
Guarantor Obligations [Line Items]
Potential additional collateral obligations	50
Credit Risk Contractual Obligation | Electric Companies and Transmission Companies
Guarantor Obligations [Line Items]
Potential additional collateral obligations	174
Upon Further Downgrade
Guarantor Obligations [Line Items]
Potential additional collateral obligations	78
Upon Further Downgrade | FE
Guarantor Obligations [Line Items]
Potential additional collateral obligations	1
Upon Further Downgrade | Electric Companies and Transmission Companies
Guarantor Obligations [Line Items]
Potential additional collateral obligations	77
Surety Bonds (collateralized amount)
Guarantor Obligations [Line Items]
Potential additional collateral obligations	$ 146
Percent of face amount of debt	60.00%
Capped portion of surety bond obligations	$ 38
Surety Bonds (collateralized amount) | FE
Guarantor Obligations [Line Items]
Potential additional collateral obligations	49
Surety Bonds (collateralized amount) | Electric Companies and Transmission Companies
Guarantor Obligations [Line Items]
Potential additional collateral obligations	$ 97

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- Definition

Guarantor Obligations, Capped Portion Of Surety Bond Obligations

+ References

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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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