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Discontinued Operations - Summarized Results of Discontinued Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | $ (5) | $ (1,251) | $ (820)
Discontinued operations (Note 3) |  | $ 70 | $ 2 | $ (29) | $ (35) | $ 4 | $ (857) | $ (9) | $ 1,188 |  |  |
Income (loss) from discontinued operations | [1] |  |  |  |  |  |  |  |  | 8 | 326 | (1,435)
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 |  |  |  |  |  |  |  |  |  | 188 | 989 | 3,055
Fuel |  |  |  |  |  |  |  |  |  | (140) | (304) | (879)
Purchased power |  |  |  |  |  |  |  |  |  | 0 | (84) | (268)
Other operating expenses |  |  |  |  |  |  |  |  |  | (63) | (435) | (1,499)
Provision for depreciation |  |  |  |  |  |  |  |  |  | 0 | (96) | (109)
General taxes |  |  |  |  |  |  |  |  |  | (14) | (35) | (103)
Impairment of assets |  |  |  |  |  |  |  |  |  | 0 | 0 | (2,358)
Pleasants economic interest |  |  |  |  |  |  |  |  |  | 27 | 0 | 0
Other expense, net |  |  |  |  |  |  |  |  |  | (2) | (83) | (94)
Income (Loss) from discontinued operations, before tax |  |  |  |  |  |  |  |  |  | (4) | (48) | (2,255)
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 47 | 61 | (820)
Discontinued operations (Note 3) |  |  |  |  |  |  |  |  |  | (51) | (109) | (1,435)
Gain on deconsolidation, net of tax |  |  |  |  |  |  |  |  |  | 59 | 435 | 0
Income (loss) from discontinued operations |  |  |  |  |  |  |  |  |  | $ 8 | $ 326 | (1,435)
FES and FENOC | Discontinued Operations, Disposed of by Means Other than Sale | Pleasants Power Station |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets |  |  |  |  |  |  |  |  |  |  |  | (120)
Competitive Asset Generation Sale | Discontinued Operations, Disposed of by Means Other than Sale |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets |  |  |  |  |  |  |  |  |  |  |  | $ (193)
[1] | Net of income tax benefit of $5 million, $1,251 million, and $820 million in 2019, 2018 and 2017, respectively.

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