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Discontinued Operations and Dispositions - Discontinued Operations Narrative (Details) $ in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 06, 2018 USD ($) extension | Mar. 31, 2020 USD ($) MW | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Feb. 04, 2019 USD ($) MW
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Generation capacity (in MW) | MW |  | 23,000 |  |  |
South Central Portfolio | Discontinued Operations, Disposed of by Sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Cash consideration |  |  |  |  | $ 1,000
Generation capacity (in MW) | MW |  |  |  |  | 1,153
Carlsbad Energy Holdings LLC | Discontinued Operations, Disposed of by Sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Cash consideration | $ 385 |  |  |  |
Percentage of ownership sold | 100.00% |  |  |  |
Lease and easement agreement, number of extensions | extension | 2 |  |  |  |
Lease renewal term | 10 years |  |  |  |
Additional commitments related to project |  | $ 23 |  | $ 23 |
Other | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Proceeds from other asset sales |  | $ 7 | $ 10 |  |

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