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DISCONTINUED OPERATIONS - Narrative (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 27, 2020 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Feb. 20, 2020 USD ($) | Dec. 31, 2018 MW
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Worthless stock deduction | $ 4,900 |  |  |  |  |  |
Unrecognized tax benefits from worthless stock deduction | 316 |  |  |  |  |  |
Worthless stock deduction, net of tax | 1,100 |  |  |  |  |  |
Unrecognized tax benefits from worthless stock deduction, net of tax | 72 |  |  |  |  |  |
Adjustments related to intercompany tax sharing |  |  | $ 12 | $ 6 |  |  |
Disposal Group, Disposed of by Sale |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from asset sales |  |  |  |  | $ 65 |  |
State and Local |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Worthless stock deduction, net of tax | 80 |  |  |  |  |  |
AE Supply | Purchase Agreement with Subsidiary of LS Power | Pleasants Power Station |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Plant generation capacity (in MW's) | MW |  |  |  |  |  |  | 1,300
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 |  |  |  |  | $ 125 |
FES Key Creditor Groups | Affiliated companies | FES |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Amount paid to settle claims |  |  |  |  |  | $ 853 |
Debtor Reorganization Items, Discharge of Claims and Liabilities |  | $ 853 |  |  |  |  |

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