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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, 2020 USD ($) MW | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Property Plant And Equipment [Line Items] |  |  |  |  |
Project Cost |  |  | $ 311 | $ 341 | $ 151
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] |  | $ 127 |  |
Date of Commercial Operations |  |  | December 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] |  | $ 32 |  |
Date of Commercial Operations |  |  | June 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 |  |
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] |  | $ 12 |  |
Date of Commercial Operations |  |  | December 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] |  | $ 14 |  |
Date of Commercial Operations |  |  | December 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] |  | $ 17 |  |
Date of Commercial Operations |  |  | January 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] |  | $ 240 |  |
Date of Commercial Operations | [2] |  | Split |  |
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 |  |  | 62 |  |
Acquisition of Solar Project Hardin II in Ohio |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |
Date Agreement Entered |  |  | 2020-08 |  |
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 |  |  | $ 35 | $ 182 | $ 141
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] |  | $ 128 |  |
Date of Commercial Operations |  |  | October 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] |  | $ 127 |  |
Date of Commercial Operations |  |  | January 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] |  | $ 165 |  |
Date of Commercial Operations |  |  | Expected 2021 |  |
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] |  | $ 185 |  |
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 |  |
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 costs.
[2] | In December 2020 and January 2021, 97 MW and 53 MW of the project commenced commercial operations, respectively.

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