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Discontinued Operations - Summarized Results (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Income tax expense |  |  | $ 1 |  | $ (35)
Income from discontinued operations, net of tax |  |  |  | $ 0 | 52
Income from discontinued operations | [1] | $ 0 | 2 | 0 | 52
FES and FENOC | Discontinued Operations, Disposed of by Means Other than Sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Revenues |  | 0 | 0 | 0 | 7
Fuel |  | 0 | 0 | 0 | (6)
Other operating expenses |  | 0 | 0 | 0 | (6)
Other income |  | 0 | 0 | 0 | 5
Income from discontinued operations, before tax |  | 0 | 0 | 0 | 0
Income tax expense |  | 0 | 0 | 0 | 0
Income from discontinued operations, net of tax |  | 0 | 0 | 0 | 0
Settlement consideration |  | 0 | 3 | 0 | (1)
Accelerated net pension and OPEB prior service credits |  | 0 | 0 | 0 | 18
Gain on disposal of FES and FENOC, before tax |  | 0 | 3 | 0 | 17
Income taxes (benefits), including worthless stock deduction |  | 0 | 1 |  | (35)
Gain on disposal of FES and FENOC, net of tax |  | 0 | 2 | 0 | 52
Income from discontinued operations |  | $ 0 | $ 2 | $ 0 | $ 52
[1] | Net of income tax expense (benefits) of $1 million and $(35) million for the three and six months ended June 30, 2020, respectively.

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