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Property, Plant and Equipment (Schedule of Nonregulated Solar Projects) (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) MW | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Property Plant And Equipment [Line Items] |  |  |  |
Project Cost |  | $ 24 | $ 167 | $ 101
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] | $ 22 |  |
Date of Commercial Operations |  | March 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] | $ 165 |  |
Date of Commercial Operations | [3],[4] | Expected 2024 |  |
MW Capacity | MW |  | 62 |  |
Acquisition of Solar Project Hardin II in Ohio |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Date Agreement Entered |  | 2020-08 |  |
Date Agreement Closed | [5] | Terminated |  |
Acquisition Of Solar Project Atlanta Farms In Ohio |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Date Agreement Entered |  | 2022-03 |  |
Date Agreement Closed |  | 2022-05 |  |
Project Cost | [1] | $ 390 |  |
Date of Commercial Operations | [3] | Expected 2024 |  |
MW Capacity | MW |  | 200 |  |
Acquisition of Solar Project Foxhound in Virginia |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Date Agreement Entered |  | 2023-03 |  |
Date Agreement Closed |  | 2024-02 |  |
Project Cost | [1] | $ 205 |  |
Date of Commercial Operations | [3] | Expected 2024(3 |  |
MW Capacity | MW |  | 83 |  |
Virginia Electric and Power Company |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Project Cost |  | $ 24 | $ 77 | $ 75
Virginia Electric and Power Company | Acquisition of Solar Project Ft. Powhatan in Virginia |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Date Agreement Entered | [6] | 2019-06 |  |
Date Agreement Closed | [6] | 2019-06 |  |
Project Cost | [6],[7] | $ 267 |  |
Date of Commercial Operations | [6] | January 2022 |  |
MW Capacity | MW | [6] | 150 |  |
Virginia Electric and Power Company | Acquisition of Solar Project Belcher in Virginia |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Date Agreement Entered | [6],[8] | 2019-06 |  |
Date Agreement Closed | [6],[8] | 2019-08 |  |
Project Cost | [6],[7],[8] | $ 164 |  |
Date of Commercial Operations | [6],[8] | June 2021 |  |
MW Capacity | MW | [6],[8] | 88 |  |
Virginia Electric and Power Company | Acquisition of Solar Project Bedford in Virginia |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Date Agreement Entered | [6] | 2019-08 |  |
Date Agreement Closed | [6] | 2019-11 |  |
Project Cost | [6],[7] | $ 106 |  |
Date of Commercial Operations | [6] | November 2021 |  |
MW Capacity | MW | [6] | 70 |  |
Virginia Electric and Power Company | Acquisition of Solar Project Maplewood in Virginia |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Date Agreement Entered | [6] | 2019-10 |  |
Date Agreement Closed | [6] | 2019-10 |  |
Project Cost | [6],[7] | $ 210 |  |
Date of Commercial Operations | [6] | December 2022 |  |
MW Capacity | MW | [6] | 120 |  |
Virginia Electric and Power Company | Acquisition of Solar Project Rochambeau in Virginia |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Date Agreement Entered | [6] | 2019-12 |  |
Date Agreement Closed | [6] | 2020-01 |  |
Project Cost | [6],[7] | $ 35 |  |
Date of Commercial Operations | [6] | December 2021 |  |
MW Capacity | MW | [6] | 20 |  |
Virginia Electric and Power Company | Acquisition of Solar Project Pumpkinseed in Virginia |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Date Agreement Entered | [6] | 2020-05 |  |
Date Agreement Closed | [6] | 2020-05 |  |
Project Cost | [6],[7] | $ 138 |  |
Date of Commercial Operations | [6] | September 2022 |  |
MW Capacity | MW | [6] | 60 |  |
[1] | Includes acquisition costs.
[2] | In December 2020 and January 2021, 97 MW and 53 MW of the project commenced commercial operations, respectively.
[3] | Dominion Energy expects to claim production tax credits on the energy generated and sold by project.
[4] | Madison is reflected in the Corporate and Other segment effective December 2023.
[5] | In January 2023, Dominion Energy terminated its agreement, without penalty, to acquire Hardin II.
[6] | During 2023, Virginia Power determined the Bookers Mill solar project under development will be utilized to support its utility customers and included the project in its most recent Rider CE application. See Note 13 for additional information.
[7] | Includes acquisition costs.
[8] | Referred to as Desper once placed in service.

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