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Acquisitions, Discontinued Operations and Dispositions - Sale of Ownership in NRG Yield, Inc. and the Renewables Platform (Details) - Discontinued Operations $ in Millions | Feb. 06, 2018 USD ($) extension | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Aug. 31, 2018 USD ($)
--- | --- | --- | --- | ---
NRG Yield and Renewables |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Cash consideration |  |  |  | $ 1,348
NRG Yield and Renewables | Cost To Complete Construction |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Additional commitments related to project |  | $ 16 |  |
NRG Yield and Renewables | Property Taxes For Solar Properties |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Additional commitments related to project |  | 22 |  |
Carlsbad Project |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Cash consideration | $ 385 |  |  |
Additional commitments related to project |  | $ 23 | $ 23 |
Percentage of ownership sold | 100.00% |  |  |
Lease and easement agreement, number of extensions | extension | 2 |  |  |
Lease renewal term | 10 years |  |  |

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