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v3.8.0.1

Discontinued Operations, Acquisitions and Dispositions - Major Classes of Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Other current assets | $ 0 | $ 1,919
Current assets - discontinued operations | 115 | 9
Other non-current assets | 43 | 10
Non-current assets - discontinued operations | 0 | 2,961
Current liabilities - discontinued operations | 0 | 1,210
Other non-current liabilities | 0 | 3,184
Non-current liabilities - discontinued operations | $ 8 | 11
GenOn | Discontinued Operations |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Cash and cash equivalents |  | 1,034
Other current assets |  | 885
Current assets - discontinued operations |  | 1,919
Property, plant and equipment, net |  | 2,543
Other non-current assets |  | 418
Non-current assets - discontinued operations |  | 2,961
Current portion of long term debt and capital leases |  | 704
Other current liabilities |  | 506
Current liabilities - discontinued operations |  | 1,210
Long-term debt and capital leases |  | 2,050
Out-of-market contracts |  | 811
Other non-current liabilities |  | 323
Non-current liabilities - discontinued operations |  | $ 3,184

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