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Acquisitions and Dispositions (Schedule of Acquisitions of Solar Projects) (Detail) $ in Millions | 1 Months Ended | 12 Months Ended
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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],[2] |  |  |  |  |  | $ 29 |  |  |
Project Cost | [3] |  |  |  |  |  | $ 205 |  |  |
MW capacity | MW |  |  |  |  |  |  | 100 |  |  |
Solar Frontier Americas Holding, LLC |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Projects | Project | [4] |  |  |  |  | 1 |  |  |  |
Total consideration | [1],[2] |  |  |  |  | $ 77 |  |  |  |
Project Cost | [3] |  |  |  |  | $ 78 |  |  |  |
MW capacity | MW |  |  |  |  |  | 30 |  |  |  |
Solar Projects from Cypress Creek Renewables, LLC |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Projects | Project |  |  |  |  | 1 |  |  |  |  |
Total consideration | [1],[2] |  |  |  | $ 154 |  |  |  |  |
Project Cost | [3] |  |  |  | $ 160 |  |  |  |  |
MW capacity | MW |  |  |  |  | 79 |  |  |  |  |
Hecate Energy Virginia C&C LLC |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Projects | Project |  |  | 1 | 1 |  |  |  |  |  |
Total consideration | [1],[2] |  | $ 40 | $ 16 |  |  |  |  |  |
Project Cost | [3] |  | $ 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],[2] |  |  | $ 20 |  |  |  |  |  |
Project Cost | [3] |  |  | $ 20 |  |  |  |  |  |
MW capacity | MW |  |  |  | 10 |  |  |  |  |  |
Strata Solar Development, LLC |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Projects | Project |  | 2 |  |  |  |  |  |  |  |
Total consideration | [1],[2] | $ 20 |  |  |  |  |  |  |  |
Project Cost | [3] | $ 21 |  |  |  |  |  |  |  |
MW capacity | MW |  | 10 |  |  |  |  |  |  |  |
[1] | Includes $40 million for an equity method investment in White River Hub. The fair value adjustment on the equity method investment in White River Hub is considered to be equity method goodwill and is not amortized.
[2] | The purchase price was primarily allocated to Property, Plant and Equipment.
[3] | Includes acquisition cost.
[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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