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COMMITMENTS, GUARANTEES AND CONTINGENCIES - Potential Collateral Obligations (Details) $ in Millions	Dec. 31, 2023 USD ($)
Guarantor Obligations [Line Items]
Potential additional collateral obligations	$ 227
Upon Further Downgrade
Guarantor Obligations [Line Items]
Potential additional collateral obligations	62
Surety Bonds (collateralized amount)
Guarantor Obligations [Line Items]
Potential additional collateral obligations	165
FE
Guarantor Obligations [Line Items]
Potential additional collateral obligations	79
FE | Upon Further Downgrade
Guarantor Obligations [Line Items]
Potential additional collateral obligations	0
FE | Surety Bonds (collateralized amount)
Guarantor Obligations [Line Items]
Potential additional collateral obligations	79
Utilities and Transmission Companies
Guarantor Obligations [Line Items]
Potential additional collateral obligations	148
Utilities and Transmission Companies | Upon Further Downgrade
Guarantor Obligations [Line Items]
Potential additional collateral obligations	62
Utilities and Transmission Companies | Surety Bonds (collateralized amount)
Guarantor Obligations [Line Items]
Potential additional collateral obligations	$ 86

X

- 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 (b)(1)
-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 (c)
-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 (f)
-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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