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Acquisitions and Dispositions (Schedule of Acquisitions of Solar Projects) (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Nov. 30, 2015 USD ($) project MW | Aug. 31, 2015 USD ($) | Jul. 31, 2015 USD ($) project MW | Jun. 30, 2015 USD ($) project MW | May 31, 2015 USD ($) | Apr. 30, 2015 USD ($) project MW | Jan. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) project MW | Nov. 30, 2014 USD ($) project MW | Mar. 31, 2014 USD ($) project MW | Dec. 31, 2014 USD ($) | Dec. 31, 2016 USD ($) project | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Project Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 40 | $ 418 | $ 206
Recurrent Energy Development Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Projects | project |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |
Initial Acquisition Cost (millions) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50 |  |  |  |
Project Cost | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 428 |  |  |
MW Capacity | MW |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 139 |  |  |  |
CSI Project Holdco, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Projects | project |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Initial Acquisition Cost (millions) | [1] |  |  |  |  |  |  |  |  |  |  |  |  | $ 79 |  |  |  |  |
Project Cost | [2] |  |  |  |  |  |  |  |  |  |  |  |  | $ 79 |  |  |  |  |
MW Capacity | MW |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |
EDF Renewable Development, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Projects | project |  |  |  |  |  |  | 1 |  |  | 3 | [3] |  | 1 |  |  |  |  |  |
Initial Acquisition Cost (millions) | [1] |  |  |  |  |  | $ 68 |  |  | $ 106 | [3] |  | $ 71 |  |  |  |  |  |
Project Cost | [2] |  |  |  |  | $ 68 |  | $ 106 | [3] |  |  | $ 71 |  |  |  |  |  |  |
MW Capacity | MW |  |  |  |  |  |  | 18 |  |  | 24 | [3] |  | 20 |  |  |  |  |  |
Number of projects that commenced operations | project | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
EC&R NA Solar PV, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Projects | project |  |  |  | 1 |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Initial Acquisition Cost (millions) | [1] |  |  | $ 65 |  |  |  |  |  | $ 66 |  |  |  |  |  |  |  |  |
Project Cost | [2] |  | $ 65 |  |  |  |  | $ 66 |  |  |  |  |  |  |  |  |  |  |
MW Capacity | MW |  |  |  | 20 |  |  |  |  |  | 20 |  |  |  |  |  |  |  |  |
SunPeak Solar, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Projects | project |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Initial Acquisition Cost (millions) | [1] |  |  |  |  | $ 42 |  |  |  |  |  |  |  |  |  |  |  |  |
Project Cost | [2] |  |  |  | $ 71 |  |  |  |  |  |  |  |  |  |  |  |  |  |
MW Capacity | MW |  |  |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |
Community Energy, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Projects | project |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial Acquisition Cost (millions) | [1] |  |  | $ 34 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Project Cost | [2] | $ 212 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MW Capacity | MW |  |  |  | 80 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | The purchase price was primarily allocated to Property, Plant and Equipment.
[2] | Includes acquisition cost.
[3] | One of the projects, Marin Carport, began commercial operations in 2016.

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