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Discontinued Operations - Summarized Results of Discontinued Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Income tax expense (benefit) |  | $ (354) |  | $ 37 | $ (1,300) | $ (1)
Income (Loss) from discontinued operations, net of tax |  |  |  |  | 405 | 0
Income (Loss) from discontinued operations | [1] | (845) |  | 95 | 370 | 3
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 |  | 83 |  | 788 | 934 | 2,299
Fuel |  | (52) |  | (237) | (269) | (671)
Purchased power |  | 0 |  | (66) | (85) | (189)
Other operating expenses |  | (24) |  | (290) | (414) | (1,097)
Provision for depreciation |  | (18) |  | (28) | (96) | (80)
General taxes |  | (4) |  | (15) | (32) | (74)
Impairment of assets |  | 0 |  | (18) | 0 | (149)
Other expense, net |  | (1) |  | (2) | (82) | (37)
Income (Loss) from discontinued operations, before tax |  | (16) |  | 132 | (44) | 2
Income tax expense (benefit) |  | (5) |  | 37 | (9) | (1)
Income (Loss) from discontinued operations, net of tax |  | (11) |  | 95 | (35) | 3
Gain (Loss) on disposal of FES and FENOC, net of tax |  | (834) | $ 1,200 | 0 | 405 | 0
Income (Loss) from discontinued operations |  | $ (845) |  | $ 95 | 370 | $ 3
Tax benefit from excess deferred tax liabilities |  |  |  |  | $ 32 |
[1] | Net of income tax expense (benefit) of $(354) million and $37 million for the three months ended September 30, 2018 and 2017, respectively, and income tax benefits of $(1.3) billion and $(1) million for the nine months ended September 30, 2018 and 2017, respectively.

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- Definition Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3B -URI http://asc.fasb.org/extlink&oid=109222160&loc=SL51721525-107759 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32672-109319 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109222160&loc=d3e1012-107759 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=109222160&loc=SL51721523-107759 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5C -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721675-107760 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 + Details
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