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INCOME TAXES - Narrative (Details) - USD ($)	Jun. 30, 2024	Mar. 31, 2024	Mar. 25, 2024	Dec. 31, 2023	Aug. 16, 2022	May 31, 2022
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Operating loss carryforwards, not subject to expiration, net of tax					$ 1,000,000,000
Operating loss carryforwards, subject to expiration				$ 8,100,000,000
Deferred tax liabilities, net	$ 46,000,000
Reduction to OPIC		$ 797,000,000
North American Transmission Company II LLC | FET
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Operating loss carryforwards, subject to expiration			$ 7,300,000,000
Sale of ownership interest by parent			49.90%			19.90%

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- Definition

Consolidation, Less Than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Sale Of Interest by Parent, Percent

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Deferred Tax assets, Federal And State Income Tax Associated With The Tax Gain

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Deferred Tax Assets Operating Loss Carryforwards Not Subject To Expiration, Net Of Tax

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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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 808
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479402/808-10-50-1

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are subject to expiration dates.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-6

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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