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Acquisitions, Discontinued Operations and Dispositions - Discontinued Operations (Details) $ in Billions | Sep. 30, 2019 MW | Feb. 04, 2019 USD ($) | Dec. 31, 2018 MW
--- | --- | --- | ---
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Generation capacity (in MW) | 23,000 |  |
South Central Portfolio | Discontinued Operations |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Cash consideration | $ |  | $ 1 |
Generation capacity (in MW) |  |  | 1,153

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