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Schedule of Acquisitions of Solar Projects (Detail) $ in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2019 MW | Sep. 30, 2020 USD ($) MW | Sep. 30, 2019 USD ($)
Property Plant And Equipment [Line Items] |  |  |  |
Project Cost |  |  | $ 245 | $ 183
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] |  | $ 32 |
Date of Commercial Operations |  |  | June 2020 |
MW Capacity | MW |  |  | 15 |
Acquisition of Solar Project Blackville in South Carolina |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Date Agreement Entered |  |  | 2020-05 |
Date Agreement Closed |  |  | 2020-05 |
Project Cost | [1] |  | $ 15 |
Date of Commercial Operations |  |  | Expected 2020 |
MW Capacity | MW |  |  | 7 |
Acquisition of Solar Project Denmark in South Carolina |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Date Agreement Entered |  |  | 2020-05 |
Date Agreement Closed |  |  | 2020-05 |
Project Cost | [1] |  | $ 15 |
Date of Commercial Operations |  |  | Expected 2020 |
MW Capacity | MW |  |  | 6 |
Acquisition of Solar Project Yemassee in South Carolina |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Date Agreement Entered |  |  | 2020-05 |
Date Agreement Closed |  |  | 2020-08 |
Project Cost | [1] |  | $ 20 |
Date of Commercial Operations |  |  | Expected 2021 |
MW Capacity | MW |  |  | 10 |
Acquisition of Solar Project Trask in South Carolina |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Date Agreement Entered |  |  | 2020-05 |
Date Agreement Closed |  |  | 2020-10 |
Project Cost | [1] |  | $ 25 |
Date of Commercial Operations |  |  | Expected 2021 |
MW Capacity | MW |  |  | 12 |
Acquisition of Solar Project Hardin I in Ohio |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Date Agreement Entered |  |  | 2020-06 |
Date Agreement Closed |  |  | 2020-06 |
Project Cost | [1] |  | $ 255 |
Date of Commercial Operations |  |  | Expected 2020 |
MW Capacity | MW |  |  | 150 |
Acquisition of Solar Project Madison in Virginia |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Date Agreement Entered |  |  | 2020-07 |
Date Agreement Closed |  |  | 2020-07 |
Project Cost | [1] |  | $ 125 |
Date of Commercial Operations |  |  | Expected 2022 |
MW Capacity | MW |  |  | 63 |
Acquisition of Solar Project Hardin II in Ohio |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Date Agreement Entered |  |  | 2020-08 |
Date Agreement Closed |  |  | Expected 2022 |
Project Cost | [1] |  | $ 295 |
Date of Commercial Operations |  |  | Expected 2023 |
MW Capacity | MW |  |  | 150 |
Virginia Electric and Power Company |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Project Cost |  |  | $ 26 | $ 169
MW Capacity | MW |  | 1,292 |  |
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] |  | $ 128 |
Date of Commercial Operations |  |  | October 2020 |
MW Capacity | MW |  |  | 80 |
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 2021 |
MW Capacity | MW |  |  | 88 |
Virginia Electric and Power Company | Acquisition of Solar Project Pumpkinseed in Virginia |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Date Agreement Entered |  |  | 2020-05 |
Date Agreement Closed |  |  | 2020-05 |
Project Cost | [1] |  | $ 130 |
Date of Commercial Operations |  |  | Expected 2022 |
MW Capacity | MW |  |  | 60 |
[1] | Includes acquisition cost

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