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Acquisitions, Discontinued Operations and Dispositions - Transfers of Assets Under Common Control (Details) $ in Millions |  | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 30, 2018 USD ($) MW | Jun. 30, 2018 USD ($) MW | Jun. 19, 2018 USD ($) | Mar. 27, 2017 USD ($) utility_scale_solar_project MW
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Generation capacity (in MW) | MW |  | 30,000 |  |
Contributions from noncontrolling interest |  | $ 295 |  |
UPMC Thermal Project |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Cash consideration |  |  | $ 84 |
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 |  |  |
Assumed non-recourse debt in transaction | $ 183 |  |  |
Contributions from noncontrolling interest | $ 19 |  |  |
Buckthorn Renewables, LLC | Discontinued Operations, Held-for-sale or Disposed of by Sale |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Percentage of ownership sold | 100.00% |  |  |
Agua Caliente solar project |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Cash consideration |  |  |  | $ 130
Number of utility scale solar projects | utility_scale_solar_project |  |  |  | 7
Assumed non-recourse debt in transaction |  |  |  | $ 328
Working capital adjustments |  |  |  | $ 1
Agua Caliente solar project | Agua Caliente |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Percentage of ownership sold |  |  |  | 16.00%
Generation capacity (in MW) | MW |  |  |  | 46
Agua Caliente solar project | Utah Portfolio |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Generation capacity (in MW) | MW |  |  |  | 265

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