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Acquisitions, Discontinued Operations and Dispositions - Summarized Results of Discontinued Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
(Loss)/Gain from discontinued operations, including disposal, net of tax $ 0 $ (2) $ 0 $ 399
Discontinued Operations, Disposed of by Sale | South Central Portfolio        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Operating revenues   0   31
Operating costs and expenses   0   (23)
Gain from operations of discontinued components/discontinued operations, net of tax   0   8
(Loss)/Gain on disposal of discontinued operation, net of tax   (1)   27
(Loss)/Gain from discontinued operations, including disposal, net of tax   (1)   35
Discontinued Operations, Disposed of by Sale | Carlsbad Energy Holdings LLC        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Operating revenues   0   19
Operating costs and expenses   0   (9)
Other expense   0   (5)
Gain from operations of discontinued components/discontinued operations, net of tax   0   5
(Loss)/gain on disposal of discontinued operations, net of tax   (1)   330
Other Commitments, Indemnification and Fees   0   27
(Loss)/Gain on disposal of discontinued operation, net of tax   (1)   357
(Loss)/Gain from discontinued operations, including disposal, net of tax   $ (1)   362
Discontinued Operations | GenOn        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
(Loss)/Gain on disposal of discontinued operation, net of tax       $ 2