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Discontinued Operations, Acquisitions and Dispositions - Transfer of Assets Under Common Control (Details) $ in Millions | Dec. 31, 2017 USD ($) MW | Nov. 01, 2017 USD ($) MW | Aug. 01, 2017 USD ($) wind_project | Mar. 27, 2017 USD ($) MW | Dec. 31, 2016 USD ($) | Sep. 01, 2016 USD ($) | Nov. 03, 2015 USD ($) facility MW | Jan. 02, 2015 USD ($)
--- | --- | --- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Generation capacity (in MW) | MW | 30,000 |  |  |  |  |  |  |
Long-term debt | $ 16,633.0 |  |  |  | $ 16,704.0 |  |  |
SPP |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Generation capacity (in MW) | MW |  | 38 |  |  |  |  |  |
Cash consideration |  | $ 71.0 |  |  |  |  |  |
Working capital adjustments |  | $ 3.0 |  |  |  |  |  |
NRG Wind TE Holdco |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash consideration |  |  | $ 44.0 |  |  |  |  |
Working capital adjustments |  |  | $ 3.0 |  |  |  |  |
Percentage of ownership sold |  |  | 25.00% |  |  |  |  |
Number of projects sold | wind_project |  |  | 12 |  |  |  |  |
Agua Caliente Solar Project |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash consideration |  |  |  | $ 130.0 |  |  |  |
Working capital adjustments |  |  |  | 1.0 |  |  |  |
Debt assumed |  |  |  | $ 328.0 |  |  |  |
CVSR |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage of ownership sold |  |  |  |  |  | 51.05% |  |
Cash consideration received |  |  |  |  |  | $ 78.5 |  |
ROFO Assets |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Generation capacity (in MW) | MW |  |  |  |  |  |  | 814 |
Percentage of ownership sold |  |  |  |  |  |  | 75.00% |
Cash consideration received |  |  |  |  |  |  | $ 209.0 | $ 489.0
Long-term debt |  |  |  |  |  |  | $ 193.0 | 737.0
Number of facilities | facility |  |  |  |  |  |  | 12 |
Cash consideration net of working capital adjustments |  |  |  |  |  |  | $ 207.0 |
NRG Yield, Inc. | CVSR |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 496.0 |  |
Financial Institutions | ROFO Assets |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Noncontrolling interest |  |  |  |  |  |  | 159.0 |
Working Capital Adjustment | ROFO Assets |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash consideration received |  |  |  |  |  |  | $ 2.0 | $ 9.0
Agua Caliente | Agua Caliente Solar Project |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Generation capacity (in MW) | MW |  |  |  | 46 |  |  |  |
Percentage of ownership sold |  |  |  | 16.00% |  |  |  |
Utah Portfolio | Agua Caliente Solar Project |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Generation capacity (in MW) | MW |  |  |  | 265 |  |  |  |

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