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Discontinued Operations and Dispositions - Sale of Ownership in NRG Yield, Inc. and the Renewables Platform (Details) MW in Thousands, $ in Millions | Feb. 06, 2018 USD ($) extension | Mar. 31, 2019 USD ($) MW | Dec. 31, 2018 USD ($) | Aug. 31, 2018 USD ($)
--- | --- | --- | --- | ---
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Generation capacity (in MW) | MW |  | 23 |  |
Discontinued Operations | NRG Yield and Renewables |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Cash consideration |  |  |  | $ 1,348
Discontinued Operations | Carlsbad Project |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Cash consideration | $ 385 |  |  |
Ownership percentage | 100.00% |  |  |
Lease and easement agreement, number of extensions | extension | 2 |  |  |
Lease renewal term | 10 years |  |  |
Additional commitments related to project |  | $ 23 | $ 23 |

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