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Acquisitions, Discontinued Operations and Dispositions - Summary of Results (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Loss on deconsolidation, net of tax                 $ (13) $ 0 $ 0
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent $ 80 $ (336) $ 69 $ (5) $ (265) $ 0 $ (702) $ (25) (192) (992) 65
Carlsbad Energy Holdings LLC | Discontinued Operations                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Operating revenues                 909 1,164 1,165
Operating costs and expenses                 (661) (1,114) (1,023)
Other expenses                 (174) (288) (261)
(Loss)/gain from operations of discontinued components, before tax                 74 (238) (119)
Income tax expense                 4 52 (20)
(Loss)/Income from operations of discontinued components, net of tax                 70 (290) (99)
Loss on deconsolidation, net of tax                 (134) 0 0
California property tax indemnification                 (153) 0 0
Other                 (75) 0 0
Loss on disposal of discontinued components, net of tax                 (362) 0 0
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent                 (292) (290) (99)
South Central Portfolio | Discontinued Operations                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Operating revenues                 410 422 467
Operating costs and expenses                 (346) (335) (395)
Other income                 2 0 0
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent                 66 87 72
GenOn | Discontinued Operations                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Operating revenues                 0 646 1,862
Operating costs and expenses                 0 (702) (1,896)
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal                 0 0 294
Other expenses                 0 (98) (168)
(Loss)/gain from operations of discontinued components, before tax                 0 (154) 92
Income tax expense                 0 9 11
(Loss)/gain from discontinued operations                 0 (163) 81
Interest income - affiliate                 3 8 11
(Loss)/Income from operations of discontinued components, net of tax                 3 (155) 92
Pre-tax loss on deconsolidation                 0 (208) 0
Settlement consideration and services credit                 63 (289) 0
Pension and post-retirement liability assumption                 21 (131) 0
Other                 (53) (6) 0
Loss on disposal of discontinued components, net of tax                 31 (634) 0
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent                 $ 34 $ (789) $ 92