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Acquisitions, Discontinued Operations and Dispositions - Discontinued Operations (Details) $ in Millions | Feb. 06, 2018 USD ($) extension | Dec. 31, 2019 USD ($) MW | Feb. 04, 2019 USD ($) MW | Dec. 31, 2018 USD ($) | Aug. 31, 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 |  |  |  |
Buckthorn Renewables, LLC |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Cash consideration |  |  |  |  |  | $ 42
Generation capacity (in MW) | MW |  |  |  |  |  | 154
Discontinued Operations | South Central Portfolio |  |  |  |  |  |
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 |  |  |
Discontinued Operations | NRG Yield Inc. And Zephyr Renewables |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Cash consideration |  |  |  |  | $ 1,348 |
Discontinued Operations | NRG Yield Inc. And Zephyr Renewables | Cost To Complete Construction |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Other commitment |  | $ 15 |  |  |  |
Discontinued Operations | NRG Yield Inc. And Zephyr Renewables | Property Taxes For Solar Properties |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Other commitment |  | 22 |  |  |  |
Discontinued Operations | Carlsbad Energy Holdings LLC |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Cash consideration | $ 385 |  |  |  |  |
Other commitment |  | $ 23 |  | $ 23 |  |
Membership percentage | 100.00% |  |  |  |  |
Lease and easement agreement, number of extensions | extension | 2 |  |  |  |  |
Renewal term | 10 years |  |  |  |  |

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