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Schedule of Acquisitions of Solar Projects (Detail) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 MW | Dec. 31, 2019 USD ($) MW | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |
Project Cost |  |  | $ 341 | $ 151 | $ 405
Acquisition of Solar Project Greensville in Virginia |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Date Agreement Entered |  |  | 2019-08 |  |
Date Agreement Closed |  |  | 2019-08 |  |
Project Cost | [1] |  | $ 130 |  |
Date of Commercial Operations |  |  | Expected 2020 |  |
MW capacity | MW |  |  | 80 |  |
Acquisition of Solar Project Myrtle in Virginia |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Date Agreement Entered |  |  | 2019-08 |  |
Date Agreement Closed |  |  | 2019-08 |  |
Project Cost | [1] |  | $ 35 |  |
Date of Commercial Operations |  |  | Expected 2020 |  |
MW capacity | MW |  |  | 15 |  |
Acquisition of Solar Project Seabrook in South Carolina |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Date Agreement Entered |  |  | 2019-09 |  |
Date Agreement Closed |  |  | 2019-09 |  |
Project Cost | [1] |  | $ 103 |  |
Date of Commercial Operations |  |  | December 2019 |  |
MW capacity | MW |  |  | 72 |  |
Acquisition of Solar Project Wilkinson in North Carolina |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Date Agreement Entered |  |  | 2019-11 |  |
Date Agreement Closed |  |  | 2019-11 |  |
Project Cost | [1] |  | $ 153 |  |
Date of Commercial Operations |  |  | December 2019 |  |
MW capacity | MW |  |  | 74 |  |
Virginia Electric and Power Company |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Project Cost |  |  | $ 182 | $ 141 | $ 41
MW capacity | MW |  | 1,292 |  |  |
Virginia Electric and Power Company | Acquisition Of Solar Project Pecan In North Carolina |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Date Agreement Entered |  |  | 2017-09 |  |
Date Agreement Closed |  |  | 2018-10 |  |
Project Cost | [1] |  | $ 140 |  |
Date of Commercial Operations |  |  | December 2018 |  |
MW capacity | MW |  |  | 75 |  |
Virginia Electric and Power Company | Acquisition of Solar Project Gutenberg in North Carolina |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Date Agreement Entered |  |  | 2017-09 |  |
Date Agreement Closed |  |  | 2019-06 |  |
Project Cost | [1] |  | $ 142 |  |
Date of Commercial Operations |  |  | September 2019 |  |
MW capacity | MW |  |  | 80 |  |
Virginia Electric and Power Company | Acquisition of Solar Project Gloucester in Virginia |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Date Agreement Entered |  |  | 2018-06 |  |
Date Agreement Closed |  |  | 2019-02 |  |
Project Cost | [1] |  | $ 37 |  |
Date of Commercial Operations |  |  | April 2019 |  |
MW capacity | MW |  |  | 20 |  |
Virginia Electric and Power Company | Acquisition of Solar Project Grasshopper in Virginia |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Date Agreement Entered |  |  | 2018-08 |  |
Date Agreement Closed |  |  | 2019-05 |  |
Project Cost | [1] |  | $ 130 |  |
Date of Commercial Operations |  |  | Expected 2020 |  |
MW capacity | MW |  |  | 80 |  |
Virginia Electric and Power Company | Acquisition of Solar Project Chestnut in North Carolina |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Date Agreement Entered |  |  | 2018-08 |  |
Date Agreement Closed |  |  | 2019-05 |  |
Project Cost | [1] |  | $ 130 |  |
Date of Commercial Operations |  |  | Expected 2020 |  |
MW capacity | MW |  |  | 75 |  |
Virginia Electric and Power Company | Acquisition of Solar Project Ft. Powhatan in Virginia |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Date Agreement Entered |  |  | 2019-06 |  |
Date Agreement Closed |  |  | 2019-06 |  |
Project Cost | [1] |  | $ 270 |  |
Date of Commercial Operations |  |  | Expected 2021 |  |
MW capacity | MW |  |  | 150 |  |
Virginia Electric and Power Company | Acquisition of Solar Project Belcher in Virginia |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Date Agreement Entered |  |  | 2019-06 |  |
Date Agreement Closed |  |  | 2019-08 |  |
Project Cost | [1] |  | $ 160 |  |
Date of Commercial Operations |  |  | Expected 2020 |  |
MW capacity | MW |  |  | 88 |  |
Virginia Electric and Power Company | Acquisition of Solar Project Bedford in Virginia |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Date Agreement Entered |  |  | 2019-08 |  |
Date Agreement Closed |  |  | 2019-11 |  |
Project Cost | [1] |  | $ 110 |  |
Date of Commercial Operations |  |  | Expected 2021 |  |
MW capacity | MW |  |  | 70 |  |
Virginia Electric and Power Company | Acquisition of Solar Project Maplewood in Virginia |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Date Agreement Entered |  |  | 2019-10 |  |
Date Agreement Closed |  |  | 2019-10 |  |
Project Cost | [1] |  | $ 190 |  |
Date of Commercial Operations |  |  | Expected 2022 |  |
MW capacity | MW |  |  | 120 |  |
Virginia Electric and Power Company | Acquisition Of Solar Project Rochambeau In Virginia |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Date Agreement Entered |  |  | 2019-12 |  |
Date Agreement Closed |  |  | 2020-01 |  |
Project Cost | [1] |  | $ 35 |  |
Date of Commercial Operations |  |  | Expected 2021 |  |
MW capacity | MW |  |  | 20 |  |
[1] | Includes acquisition costs.

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