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Discontinued Operations - Summarized Results (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income tax expense $ (47) $ 6 $ (47) $ (29)
Income from discontinued operations, net of tax     47 46
Income from discontinued operations [1] 47 (6) 47 46
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 0 0 (1)
Accelerated net pension and OPEB prior service credits 0 0 0 18
Gain on disposal of FES and FENOC, before tax 0 0 0 17
Income taxes (benefits), including worthless stock deduction (47) 6 (47) (29)
Gain on disposal of FES and FENOC, net of tax 47 (6) 47 46
Income from discontinued operations $ 47 $ (6) $ 47 $ 46
[1] Net of income tax expense (benefits) of $(47) million for the three and nine months ended September 30, 2021, and $6 million and $(29) million for the three and nine months ended September 30, 2020, respectively.