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Discontinued Operations - Summarized Results (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Income tax expense (benefit) |  | $ 2 | $ (342) | $ 46 | $ (1,200) |
Loss from discontinued operations, net of tax |  |  |  | (16) | 405 |
Income (loss) from discontinued operations | [1] | 2 | (857) | (62) | 322 |
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 |  | 62 | 83 | 147 | 934 |
Fuel |  | (50) | (52) | (105) | (269) |
Purchased power |  | 0 | 0 | 0 | (85) |
Other operating expenses |  | (16) | (24) | (42) | (414) |
Provision for depreciation |  | 0 | (18) | 0 | (96) |
General taxes |  | (2) | (4) | (11) | (32) |
Other income (expense) |  | 2 | (1) | 10 | (82) |
Loss from discontinued operations, before tax |  | (4) | (16) | (1) | (44) |
Income tax expense (benefit) |  | 17 | 7 | 45 | 39 |
Loss from discontinued operations, net of tax |  | (21) | (23) | (46) | (83) |
Gain (loss) on disposal of FES and FENOC, net of tax |  | 23 | (834) | (16) | 405 | $ 435
Income (loss) from discontinued operations |  | $ 2 | $ (857) | $ (62) | $ 322 |
[1] | Net of income tax expense (benefits) of $2 million and $(342) million for the three months ended September 30, 2019 and 2018, respectively, and $46 million and $(1.2) billion for the nine months ended September 30, 2019 and 2018, respectively.

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