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Discontinued Operations and Dispositions - Sale of Assets to NRG Yield, Inc. Prior to Discontinued Operations (Details) $ in Millions | Mar. 31, 2019 MW | 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 |
Buckthorn Renewables, LLC |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Percentage of ownership sold |  | 100.00%
Generation capacity (in MW) | MW |  | 154
Cash consideration | $ |  | $ 42
Debt assumed | $ |  | $ 183

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