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Acquisitions, Discontinued Operations and Dispositions - Sale of Assets to NRG Yield, Inc. Prior to Discontinued Operations (Details) $ in Millions | Sep. 30, 2019 MW | Jan. 31, 2019 USD ($) | Jun. 19, 2018 USD ($) | Mar. 30, 2018 USD ($) MW
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Generation capacity (in MW) | MW | 23,000 |  |  |
UPMC Thermal Project |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Cash consideration |  | $ 3 | $ 84 |
Buckthorn Renewables, LLC |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Cash consideration |  |  |  | $ 42
Percentage of ownership sold |  |  |  | 100.00%
Generation capacity (in MW) | MW |  |  |  | 154
Debt assumed |  |  |  | $ 183

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