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Acquisitions, Discontinued Operations and Dispositions - Summary of Results (Details) - USD ($)
$ in Millions
 2 Months Ended 3 Months Ended 5 Months Ended 6 Months Ended
Jun. 14, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 14, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Loss from discontinued operations, net of tax   $ (25) $ (741)   $ (25) $ (775)
Discontinued Operations | GenOn            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Operating revenues $ 265 0   $ 646 0  
Operating costs and expenses (327) 0   (700) 0  
Other expenses (54) 0   (98) 0  
Loss from operations of discontinued components, before tax (116) 0   (152) 0  
Income tax expense 8 0   9 0  
Loss from operations of discontinued components (124) 0   (161) 0  
Interest income - affiliate 3 2   6 3  
Loss from operations of discontinued components, net of tax (121) 2   (155) 3  
Pre-tax loss on deconsolidation (208) 0   (208) 0  
Settlement consideration and services credit (289) 0   (289) 0  
Pension and post-retirement liability assumption (119) 1   (119) 1  
Advisory and consulting fees (4) (1)   (4) (2)  
Other 0 (27)   0 (27)  
Loss on disposal of discontinued components, net of tax (620) (27)   (620) (28)  
Loss from discontinued operations, net of tax $ (741) $ (25)   $ (775) $ (25)