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Discontinued Operations, Acquisitions and Dispositions - Major Classes of Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
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