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Discontinued Operations - Summarized Results of Discontinued Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income tax expense (benefit) $ 30 $ 15 $ 920 $ 41
Income (Loss) from discontinued operations, net of tax     1,239 0
Income (loss) from discontinued operations [1] 32 (45) 1,224 (97)
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 11 680 633 1,369
Fuel (5) (180) (121) (344)
Purchased power 0 (74) (53) (123)
Other operating expenses 0 (282) (347) (774)
Provision for depreciation 0 (27) (46) (52)
General taxes 0 (23) (18) (52)
Impairment of assets 0 (131) 0 (131)
Other expense, net (4) (23) (64) (31)
Income (Loss) from discontinued operations, before tax 2 (60) (16) (138)
Income tax expense (benefit) (30) (15) (1) (41)
Income (Loss) from discontinued operations, net of tax 32 (45) (15) (97)
Gain on deconsolidation, net of tax 0 0 1,239 0
Income (loss) from discontinued operations $ 32 $ (45) 1,224 $ (97)
Tax benefit from excess deferred tax liabilities     $ 32  
[1] Net of income tax benefits of $30 million and $15 million for the three months ended June 30, 2018 and 2017, respectively, and income tax benefits of $920 million and $41 million for the six months ended June 30, 2018 and 2017, respectively.