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Discontinued Operations - Summarized Results of Discontinued Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Income tax expense (benefit) |  | $ 30 | $ 15 | $ 920 | $ 41
Income (Loss) from discontinued operations, net of tax |  |  |  | 1,239 | 0
Income (loss) from discontinued operations | [1] | 32 | (45) | 1,224 | (97)
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 |  | 11 | 680 | 633 | 1,369
Fuel |  | (5) | (180) | (121) | (344)
Purchased power |  | 0 | (74) | (53) | (123)
Other operating expenses |  | 0 | (282) | (347) | (774)
Provision for depreciation |  | 0 | (27) | (46) | (52)
General taxes |  | 0 | (23) | (18) | (52)
Impairment of assets |  | 0 | (131) | 0 | (131)
Other expense, net |  | (4) | (23) | (64) | (31)
Income (Loss) from discontinued operations, before tax |  | 2 | (60) | (16) | (138)
Income tax expense (benefit) |  | (30) | (15) | (1) | (41)
Income (Loss) from discontinued operations, net of tax |  | 32 | (45) | (15) | (97)
Gain on deconsolidation, net of tax |  | 0 | 0 | 1,239 | 0
Income (loss) from discontinued operations |  | $ 32 | $ (45) | 1,224 | $ (97)
Tax benefit from excess deferred tax liabilities |  |  |  | $ 32 |
[1] | Net of income tax benefits of $30 million and $15 million for the three months ended June 30, 2018 and 2017, respectively, and income tax benefits of $920 million and $41 million for the six months ended June 30, 2018 and 2017, respectively.

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