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Discontinued Operations - Narrative (Details) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Feb. 27, 2020 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2020 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 |  |  |
Discontinued operations, net of tax | [1] |  | $ 0 | $ 50 |
Pleasants Power Station | AE Supply | Purchase Agreement with Subsidiary of LS Power |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Plant capacity (in MW's) | MW |  |  |  |  | 1,300
Discontinued Operations, Disposed of by Means Other than Sale | FES and FENOC |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Discontinued operations, net of tax |  |  | $ 0 | 50 |
Disposed of by Sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Proceeds from asset sales |  |  |  | $ 65 |
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] |  |  |  |  |
Settlement of claims upon emergence |  | 125 |  |  |
State and Local Jurisdiction |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Worthless stock deduction, net of tax |  | $ 80 |  |  |
[1] | Net of income tax benefits of $36 million for the three months ended March 31, 2020.

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