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Discontinued Operations - Major Classes of Assets and Liabilities as Discontinued Operations (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Total current assets $ 17 $ 632
Property, plant and equipment 0 1,132
Total current liabilities 0 978
Total noncurrent liabilities 0 3,528
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]    
Cash and cash equivalents 0 1
Restricted cash 0 3
Receivables 0 202
Materials and supplies 17 227
Prepaid taxes and other 0 199
Total current assets 17 632
Property, plant and equipment 0 1,132
Investments 0 1,875
Other noncurrent assets 0 356
Total noncurrent assets 0 3,363
Total assets included in discontinued operations 17 3,995
Currently payable long-term debt 0 524
Accounts payable 0 200
Accrued taxes 0 38
Accrued compensation and benefits 0 79
Other current liabilities 0 137
Total current liabilities 0 978
Long-term debt and other long-term obligations 0 2,428
Accumulated deferred income taxes 0 (1,812)
Asset retirement obligations 0 1,945
Deferred gain on sale and leaseback transaction 0 723
Other noncurrent liabilities 0 244
Total noncurrent liabilities 0 3,528
Total liabilities included in discontinued operations $ 0 $ 4,506