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Discontinued Operations - Summarized Results (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Income tax expense |  |  | $ 36
Income from discontinued operations, net of tax |  | $ 0 | 50
Income from discontinued operations | [1] | 0 | 50
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 | 7
Fuel |  | 0 | (6)
Other operating expenses |  | 0 | (6)
Other income |  | 0 | 5
Income from discontinued operations, before tax |  | 0 | 0
Income tax expense |  | 0 | 0
Income from discontinued operations, net of tax |  | 0 | 0
Settlement consideration |  | 0 | (4)
Accelerated net pension and OPEB prior service credits |  | 0 | 18
Gain on Disposal of FES and FENOC, before tax |  | 0 | 14
Income tax benefits including worthless stock deduction |  | 0 | (36)
Gain on disposal of FES and FENOC, net of tax |  | 0 | 50
Income from discontinued operations |  | $ 0 | $ 50
[1] | Net of income tax benefits of $36 million for the three months ended March 31, 2020.

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