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Schedule of Acquisitions of Solar Projects (Detail) $ in Millions | 9 Months Ended
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Sep. 30, 2022 USD ($) MW | Sep. 30, 2021 USD ($)
Property Plant And Equipment [Line Items] |  |  |
Project Cost |  | $ 139 | $ 87
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] | $ 130 |
Date of Commercial Operations |  | Expected 2023 |
MW Capacity | MW |  | 62 |
Acquisition of Solar Project Atlanta Farms in Ohio |  |  |
Property Plant And Equipment [Line Items] |  |  |
Date Agreement Entered |  | 2022-03 |
Date Agreement Closed |  | May 2022 |
Project Cost | [1] | $ 390 |
Date of Commercial Operations | [2] | Expected split |
MW Capacity | MW |  | 200 |
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] | $ 290 |
Date of Commercial Operations |  | Expected 2023 |
MW Capacity | MW |  | 150 |
Virginia Electric and Power Company |  |  |
Property Plant And Equipment [Line Items] |  |  |
Project Cost |  | $ 51 | $ 61
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 | [3] | $ 138 |
Date of Commercial Operations |  | September 2022 |
MW Capacity | MW |  | 60 |
Virginia Electric and Power Company | Acquisition of Solar Project Bookers Mill in Virginia |  |  |
Property Plant And Equipment [Line Items] |  |  |
Date Agreement Entered |  | 2021-02 |
Date Agreement Closed |  | 2021-06 |
Project Cost | [3] | $ 225 |
Date of Commercial Operations |  | Expected 2023 |
MW Capacity | MW |  | 127 |
[1] | Includes acquisition cost.
[2] | Expected to be split between 2023 and 2024
[3] | Includes acquisition cost

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