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Discontinued Operations - Summarized Results of Discontinued Operations (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Income tax expense (benefit) $ (890) $ (26)
Loss from discontinued operations, net of tax 1,239 0
Income (loss) from discontinued operations 1,192 (52)
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 622 689
Fuel (116) (164)
Purchased power (53) (49)
Other operating expenses (347) (492)
Provision for depreciation (46) (25)
General taxes (18) (29)
Other Income (Expense) (60) (8)
Loss from discontinued operations, before tax (18) (78)
Income tax expense (benefit) 29 (26)
Loss from discontinued operations, net of tax (47) (52)
Gain on deconsolidation, net of tax 1,239 0
Income (loss) from discontinued operations $ 1,192 $ (52)