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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, 2019	Mar. 31, 2018	Dec. 31, 2018
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	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	(33)	0
Gain (Loss) on disposal of FES and FENOC, before tax	(33)	320
Income tax benefit, including estimated worthless stock deduction	9	919
Gain (Loss) on disposal of FES and FENOC, net of tax	$ (24)	$ 1,239	$ 435

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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
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-SubTopic 10
-Section 50
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-SubTopic 10
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