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Acquisitions, Discontinued Operations and Dispositions - Summarized Results of Discontinued Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain from discontinued operations, net of tax $ 0 $ 13 $ 0 $ 401
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   0   8
Gain on/from disposal of discontinued operation, net of tax   1   28
Gain from discontinued operations, net of tax   1   36
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   0   5
(Loss)/gain on disposal of discontinued operations, net of tax   (17)   331
Other Commitments, Indemnification and Fees   27   27
Gain on/from disposal of discontinued operation, net of tax   10   358
Gain from discontinued operations, net of tax   10   363
Discontinued Operations | GenOn        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain on/from disposal of discontinued operation, net of tax   $ 2   $ 2