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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
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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

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