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Schedule of Acquisitions of Solar Projects (Detail) $ in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2019 MW | Sep. 30, 2019 USD ($) MW | Sep. 30, 2018 USD ($)
Property Plant And Equipment [Line Items] |  |  |  |
Project Cost |  |  | $ 183 | $ 108
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] |  | $ 105 |
Date of Commercial Operations |  |  | Expected 2019 |
MW Capacity | MW |  |  | 72 |
Virginia Electric and Power Company |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Project Cost |  |  | $ 169 | $ 98
MW Capacity | MW |  | 1,292 |  |
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 |  |  | 2019-03 |
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 2019 |
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 |  |  | Pending |
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 |
[1] | Includes acquisition cost.

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