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Acquisitions, Discontinued Operations and Dispositions - Summary of Results (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Gain/(loss) on disposal of discontinued operations, net of tax $ 0 $ 0 $ (13)
Income/(loss) from discontinued operations, net of income tax $ 0 321 (192)
Discontinued Operations | South Central Portfolio      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Operating revenue   31 410
Operating costs and expenses   (23) (346)
Other income   0 2
(Loss)/gain from operations of discontinued components, before tax   8 66
(Loss)/income on disposal of discontinued operations, net of tax   20 0
Income/(loss) from discontinued operations, net of income tax   28 66
Discontinued Operations | Carlsbad Energy Holdings LLC      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Operating revenue   19 909
Operating costs and expenses   (9) (661)
Other expenses   (5) (174)
(Loss)/gain from operations of discontinued components, before tax   5 74
Income tax expense   0 4
Income/(loss) from discontinued operations, net of tax   5 70
Gain/(loss) on disposal of discontinued operations, net of tax   265 (134)
Income/(expense) from California property tax indemnification   22 (153)
Income/(expense) from other commitments, indemnification and fees   4 (75)
(Loss)/income on disposal of discontinued operations, net of tax   291 (362)
Income/(loss) from discontinued operations, net of income tax   296 (292)
Discontinued Operations | GenOn      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Interest income-affiliate   0 3
Income/(loss) from discontinued operations, net of tax   0 3
Settlement consideration, insurance and services credit   0 63
Pension and post-retirement liability assumptions   0 21
Income/(expense) from other commitments, indemnification and fees   (3) (53)
(Loss)/income on disposal of discontinued operations, net of tax   (3) 31
Income/(loss) from discontinued operations, net of income tax   $ (3) $ 34