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Discontinued Operations and Dispositions - Summary of Results (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Loss from discontinued operations, net of tax $ 0 $ (34)
Discontinued Operations | GenOn    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Operating revenues   381
Operating costs and expenses   (373)
Other expenses   (44)
Loss from operations of discontinued components, before tax   (36)
Income tax expense   1
Loss from operations of discontinued components   (37)
Interest income - affiliate   3
Loss from discontinued operations, net of tax   $ (34)