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Investments Accounted for by the Equity Method and Variable Interest Entities - Variable Interest Entities (Details) $ in Millions | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2009 | Dec. 31, 2017 USD ($) MW facility | Dec. 31, 2016 USD ($) | Nov. 02, 2016 MW | Sep. 17, 2013 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Generation capacity (in MW) | MW |  | 30,000 |  |  |
Equity investments in affiliates |  | $ 1,038 | $ 1,120 |  |
Long-term debt |  | 16,633 | 16,704 |  |
Amount drawn on working capital facility |  | 14 |  |  |
Non Recourse Debt |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Long-term debt |  | 9,451 | $ 8,909 |  |
GenConn |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity investments in affiliates |  | $ 102 |  |  |
Ownership percentage |  | 50.00% |  |  |
Number of peaking generation facilities | facility |  | 2 |  |  |
Generation capacity of peaking facility (in MW) | MW |  | 190 |  |  |
GenConn | GenConn Working Capital Facility |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Term of revolving working capital facility | 5 years |  |  |  |
GenConn | Non Recourse Debt | GenConn Facility |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Long-term debt |  | $ 204 |  |  | $ 237
Interest rate, stated percentage |  |  |  |  | 4.73%
GenConn | Non Recourse Debt | GenConn Working Capital Facility |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Long-term debt |  |  |  |  | $ 35
Interest rate, stated percentage |  |  |  |  | 1.875%
Mechanically-complete Solar Assets | Sun Edison Utility-Scale Solar and Wind |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Generation capacity (in MW) | MW |  |  |  | 530 |
Equity investments in affiliates |  | $ 345 |  |  |

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