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Discontinued Operations - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 27, 2020 | Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Cash provided by investing activities from discontinued operations |  |  | $ 0 | $ 0
Cash provided by financing activities from discontinued operations |  |  | 0 | 0
Worthless stock deduction | $ 4,900 |  |  |
Unrecognized tax benefits from worthless stock deduction | 316 |  |  |
Worthless stock deduction, net of tax | 1,000 |  |  |
Unrecognized tax benefits from worthless stock deduction, net of tax | 68 |  |  |
Increase in NOL allocation |  | $ 289 |  |
Increase in NOL allocation tax effected |  | $ 61 |  |
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] |  |  |  |
Cash flows from operating activities, discontinued operations |  |  | $ 47 | $ 46
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 | $ 19 |  |  |

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