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Acquisitions and Dispositions (Merchant Solar Projects) (Narrative) (Detail) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 USD ($) Project | Sep. 30, 2015 Project MW | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) Project MW | Dec. 31, 2015 USD ($) | Jan. 31, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Project Cost |  |  | $ 405 | $ 40 | $ 418 |
Merchant Solar Projects | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
MW Capacity | MW |  | 425 |  |  |  |
Number of solar projects | Project |  | 24 |  |  |  |
Total number of solar projects related to potential sale | Project | 15 |  |  |  |  |
Amount of consideration | $ 184 |  |  |  | $ 184 | $ 117
Merchant Solar Projects | Disposal Group, Disposed of by Sale, Not Discontinued Operations | SunEdison, Inc |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Percentage of equity interest sold to non-controlling interest owners |  | 33.00% |  |  |  |
Terra Nova Renewable Partners | Call Option | Merchant Solar Projects |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Percentage ownership in total units |  |  | 67.00% |  |  |
Number of Solar Development Projects in Operation [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Percentage of equity interests acquired |  |  |  | 100.00% |  |
Number of Projects | Project |  |  |  | 7 |  |
Aggregate purchase price |  |  |  | $ 32 |  |
Project Cost |  |  |  | $ 421 |  |
MW Capacity | MW |  |  |  | 221 |  |

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