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Discontinued Operations, Acquisitions and Dispositions - Summary of Results (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent $ 13 $ (27) $ (741) $ (34) $ (164) $ 265 $ (113) $ 104 $ (789) $ 92 $ (105)
GenOn | Discontinued Operations                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Operating revenues                 646 1,862  
Operating costs and expenses                 (702) (1,896)  
Gain on sale of assets                 0 294  
Other expenses                 (98) (168)  
(Loss)/Income from operations of discontinued components, before tax                 (154) 92  
Income tax expense                 9 11  
(Loss)/Income from operations of discontinued components                 (163) 81  
Interest income - affiliate                 8 11  
(Loss)/Income from operations of discontinued components, net of tax                 (155) 92  
Pre-tax loss on deconsolidation                 (208) 0  
Settlement consideration and services credit                 (289) 0  
Pension and post-retirement liability assumption                 (131) 0  
Other                 (6) 0  
Loss on disposal of discontinued components, net of tax     $ (208)           (634) 0  
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent                 $ (789) $ 92