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Discontinued Operations - Gain on Deconsolidation (Details) - FES and FENOC - Discontinued Operations, Disposed of by Means Other than Sale - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
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] |  |  |  |
Removal of investment in FES and FENOC |  | $ 0 | $ 2,193 |
Assumption of benefit obligations retained at FE | $ 820 | 0 | (820) |
Guarantees and credit support provided by FE |  | 0 | (139) |
Reserve on receivables and allocated pension/OPEB mark-to-market |  | 0 | (914) |
Settlement consideration and services credit |  | 7 | (1,197) |
Loss on disposal of FES and FENOC, before tax |  | 7 | (877) |
Income tax benefit, including estimated worthless stock deduction |  | 52 | 1,312 |
Gain on disposal of FES and FENOC, net of tax |  | $ 59 | $ 435 | $ 0

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- Definition Amount of gain (loss) from deconsolidation of subsidiary and derecognition of group of assets constituting transfer of business or nonprofit activity, excluding conveyance of oil and gas mineral rights and transfer of good or service in contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684 + Details
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- Definition Amount of gain (loss) from remeasurement to fair value of retained investment in former subsidiary and group of assets constituting business or nonprofit activity deconsolidated and derecognized, excluding conveyance of oil and gas mineral rights and transfer of product or service in contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684 + Details
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