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Discontinued Operations - Summarized Results (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income tax expense   $ 1   $ (35)
Income from discontinued operations, net of tax     $ 0 52
Income from discontinued operations [1] $ 0 2 0 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 0 0 0 7
Fuel 0 0 0 (6)
Other operating expenses 0 0 0 (6)
Other income 0 0 0 5
Income from discontinued operations, before tax 0 0 0 0
Income tax expense 0 0 0 0
Income from discontinued operations, net of tax 0 0 0 0
Settlement consideration 0 3 0 (1)
Accelerated net pension and OPEB prior service credits 0 0 0 18
Gain on disposal of FES and FENOC, before tax 0 3 0 17
Income taxes (benefits), including worthless stock deduction 0 1 (35)
Gain on disposal of FES and FENOC, net of tax 0 2 0 52
Income from discontinued operations $ 0 $ 2 $ 0 $ 52
[1] Net of income tax expense (benefits) of $1 million and $(35) million for the three and six months ended June 30, 2020, respectively.