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Discontinued Operations - Narrative (Details) $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Feb. 27, 2020 USD ($) | Feb. 18, 2020 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 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 | 1,000 |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits from worthless stock deduction, net of tax | 72 |  |  |  |  |  |  |  |  |  |
Discontinued operations, net of tax |  |  |  | $ 2 | [1] |  | $ (29) | [1] | $ 52 | $ (64) |
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 |  |  |  | $ 2 |  |  | $ (29) |  | $ 52 | $ (64) |
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 certain claims |  |  | $ 853 |  |  |  |  |  |  |  |
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 certain claims |  | $ 125 |  |  |  |  |  |  |  |  |
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 | $ 83 |  |  |  |  |  |  |  |  |  |
[1] | Net of income tax expense of $1 million and $39 million for the three months ended June 30, 2020 and 2019, respectively, and $(35) million and $44 million for the six months ended June 30, 2020 and 2019, respectively.

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