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Discontinued Operations - Gain on Deconsolidation (Details) - FES and FENOC - Discontinued Operations, Disposed of by Means Other than Sale - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Mar. 31, 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]          
Removal of investment in FES and FENOC       $ 2,193  
Assumption of benefit obligations retained at FE (including Pension, OPEB and EDCP)   $ (820)      
Guarantees and credit support provided by FE       (139)  
Reserve on receivables and allocated Pension/OPEB mark-to-market       (914)  
Gain on deconsolidation of FES and FENOC, before tax       320  
Income tax benefit, including estimated worthless stock deduction       919  
Gain on deconsolidation of FES and FENOC, net of tax $ 0   $ 0 $ 1,239 $ 0