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Discontinued Operations - Summarized Results (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Income tax expense   $ 36
Income from discontinued operations, net of tax $ 0 50
Income from discontinued operations [1] 0 50
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 7
Fuel 0 (6)
Other operating expenses 0 (6)
Other income 0 5
Income from discontinued operations, before tax 0 0
Income tax expense 0 0
Income from discontinued operations, net of tax 0 0
Settlement consideration 0 (4)
Accelerated net pension and OPEB prior service credits 0 18
Gain on Disposal of FES and FENOC, before tax 0 14
Income tax benefits including worthless stock deduction 0 (36)
Gain on disposal of FES and FENOC, net of tax 0 50
Income from discontinued operations $ 0 $ 50
[1] Net of income tax benefits of $36 million for the three months ended March 31, 2020.