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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 | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Project Cost |  |  |  |  |  |  |  | $ 151 | $ 405 | $ 40
Community Energy Solar, Inc |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Projects | Project |  |  |  |  |  |  | 1 |  |  |
Total consideration | [1] |  |  |  |  |  | $ 29 |  |  |
Project Cost | [2] |  |  |  |  |  | $ 205 |  |  |
MW capacity | MW |  |  |  |  |  |  | 100 |  |  |
Solar Frontier Americas Holding, LLC |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Projects | Project | [3] |  |  |  |  | 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] | 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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