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Discontinued Operations - Major Classes of Assets and Liabilities as Discontinued Operations (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Total current assets | $ 0 | $ 606
Property, plant and equipment | 0 | 1,057
Total current liabilities | 0 | 973
Total noncurrent liabilities | 0 | 3,399
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 | 0 | 1
Restricted cash | 0 | 3
Receivables | 0 | 202
Materials and supplies | 0 | 201
Collateral | 0 | 130
Other current assets | 0 | 69
Total current assets | 0 | 606
Property, plant and equipment | 0 | 1,057
Investments | 0 | 1,875
Other non-current assets | 0 | 356
Total non-current assets | 0 | 3,288
Total assets included in discontinued operations | 0 | 3,894
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 | 132
Total current liabilities | 0 | 973
Long-term debt and other long-term obligations | 0 | 2,299
Accumulated deferred income taxes | 0 | (1,812)
Asset retirement obligations | 0 | 1,945
Deferred gain on sale and leaseback transaction | 0 | 723
Other non-current liabilities | 0 | 244
Total noncurrent liabilities | 0 | 3,399
Total liabilities included in discontinued operations | $ 0 | $ 4,372

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