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Acquisitions and Dispositions (Schedule of Acquisitions of Solar Projects) (Detail) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2017 USD ($) Project MW | Sep. 30, 2017 USD ($) Project MW | Jun. 30, 2017 USD ($) Project MW | May 31, 2017 USD ($) Project MW | Mar. 31, 2017 USD ($) Project MW | Feb. 28, 2017 USD ($) Project MW | Nov. 30, 2015 USD ($) Project MW | Jul. 31, 2015 USD ($) Project MW | Jun. 30, 2015 USD ($) Project MW | Apr. 30, 2015 USD ($) Project MW | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Project Cost |  |  |  |  |  |  |  |  |  |  |  |  | $ 405 | $ 40 | $ 418
EC&R NA Solar PV, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Projects | Project |  |  |  |  |  |  |  | 1 |  |  | 1 |  |  |  |
Total consideration | [1] |  |  |  |  |  |  | $ 65 |  |  | $ 66 |  |  |  |
Project Cost | [2] |  |  |  |  |  |  | $ 65 |  |  | $ 66 |  |  |  |
MW Capacity | MW |  |  |  |  |  |  |  | 20 |  |  | 20 |  |  |  |
EDF Renewable Development, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Projects | Project |  |  |  |  |  |  |  |  |  | 1 | 3 | [3] |  |  |
Total consideration | [1] |  |  |  |  |  |  |  |  | $ 68 | $ 106 | [3] |  |  |
Project Cost | [2] |  |  |  |  |  |  |  |  | $ 68 | $ 106 | [3] |  |  |
MW Capacity | MW |  |  |  |  |  |  |  |  |  | 18 | 24 | [3] |  |  |
Sun Peak Solar LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Projects | Project |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Total consideration | [1] |  |  |  |  |  |  |  | $ 42 |  |  |  |  |  |
Project Cost | [2] |  |  |  |  |  |  |  | $ 71 |  |  |  |  |  |
MW Capacity | MW |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |
Community Energy Solar, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Projects | Project |  |  |  |  |  |  | 1 | 1 |  |  |  |  |  |  |
Total consideration | [1] |  |  |  |  |  | $ 29 | $ 34 |  |  |  |  |  |  |
Project Cost | [2] |  |  |  |  |  | $ 205 | $ 212 |  |  |  |  |  |  |
MW Capacity | MW |  |  |  |  |  |  | 100 | 80 |  |  |  |  |  |  |
Solar Frontier Americas Holding, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Projects | Project | [4] |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Total consideration | [1] |  |  |  |  | $ 77 |  |  |  |  |  |  |  |  |
Project Cost | [2] |  |  |  |  | $ 78 |  |  |  |  |  |  |  |  |
MW Capacity | MW |  |  |  |  |  | 30 |  |  |  |  |  |  |  |  |
Solar Projects from Cypress Creek Renewables, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Projects | Project |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |
Total consideration | [1] |  |  |  | $ 154 |  |  |  |  |  |  |  |  |  |
Project Cost | [2] |  |  |  | $ 160 |  |  |  |  |  |  |  |  |  |
MW Capacity | MW |  |  |  |  | 79 |  |  |  |  |  |  |  |  |  |
Hecate Energy Virginia C&C LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Projects | Project |  |  | 1 | 1 |  |  |  |  |  |  |  |  |  |  |
Total consideration | [1] |  | $ 40 | $ 16 |  |  |  |  |  |  |  |  |  |  |
Project Cost | [2] |  | $ 41 | $ 16 |  |  |  |  |  |  |  |  |  |  |
MW Capacity | MW |  |  | 20 | 10 |  |  |  |  |  |  |  |  |  |  |
Strata Solar Development, LLC/Moorings Farm 2 Holdco, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Projects | Project |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Total consideration | [1] |  |  | $ 20 |  |  |  |  |  |  |  |  |  |  |
Project Cost | [2] |  |  | $ 20 |  |  |  |  |  |  |  |  |  |  |
MW Capacity | MW |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |
Strata Solar Development, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Projects | Project |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration | [1] | $ 20 |  |  |  |  |  |  |  |  |  |  |  |  |
Project Cost | [2] | $ 21 |  |  |  |  |  |  |  |  |  |  |  |  |
MW Capacity | MW |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |
[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.
[4] | In April 2017, Dominion Energy discontinued efforts on the acquisition of the additional 20 MW solar project from Solar Frontier Americas Holding LLC.

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