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INCOME TAXES - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2023 | 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 |
Estimated AMT paid | $ 49 |  |  |  |  |
Operating loss carryforwards, subject to expiration |  |  |  | $ 8,100 |  |
Deferred tax liabilities, net |  | $ 46 |  |  |  |
Reduction to OPIC |  | $ 797 |  |  |  |
Interest sale |  | 30.00% |  |  |  |
North American Transmission Company II LLC | FET |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Additional sale of ownership interest by parent |  |  | 30.00% | 30.00% |  |
Operating loss carryforwards, subject to expiration |  |  | $ 7,300 |  |  |
Sale of ownership interest by parent |  |  | 49.90% |  |  | 19.90%

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