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DISCONTINUED OPERATIONS - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Feb. 27, 2020 | Dec. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Worthless stock deduction | $ 4,900 | $ 5,200 |  |
Unrecognized tax benefits from worthless stock deduction | 316 |  |  |
Worthless stock deduction, net of tax |  | 1,100 |  |
Increase in NOL allocation |  |  | $ 289 |
Increase in NOL allocation tax effected |  |  | $ 61 |
Revision of Prior Period, Adjustment |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Deferred tax assets, valuation allowance |  |  |  | $ 21
State and Local |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Worthless stock deduction, net of tax |  | $ 21 |  |
FES Key Creditor Groups | Affiliated companies | FES |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Settlement of claims upon emergence | 853 |  |  |
IT Access Agreement | Affiliated companies | FES |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Amount paid to settle claims | $ 125 |  |  |

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