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Discontinued Operations - Summarized Results of Discontinued Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Income tax expense (benefit) |  | $ 5 | $ (871) |
Loss from discontinued operations, net of tax |  | (24) | 1,239 |
Income (Loss) from discontinued operations | [1] | (35) | 1,188 |
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 |  | 54 | 736 |
Fuel |  | (35) | (164) |
Purchased power |  | 0 | (58) |
Other operating expenses |  | (10) | (369) |
Provision for depreciation |  | 0 | (63) |
General taxes |  | (4) | (23) |
Other expense, net (1) |  | (2) | (62) |
Income (Loss) from discontinued operations, before tax |  | 3 | (3) |
Income tax expense (benefit) |  | 14 | 48 |
Loss from discontinued operations, net of tax |  | (11) | (51) |
Gain (Loss) on disposal of FES and FENOC, net of tax |  | (24) | 1,239 | $ 435
Income (Loss) from discontinued operations |  | $ (35) | $ 1,188 |
[1] | Net of income tax expense (benefits) of $5 million and $(871) million for the three months ended March 31, 2019 and 2018, respectively.

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