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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, 2022 USD ($) MW | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Property Plant And Equipment [Line Items] |  |  |  |
Project Cost |  | $ 167 | $ 101 | $ 311
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 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] | $ 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] | 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 | [4] | 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],[5] | Expected split |  |
MW Capacity | MW |  | 200 |  |
Virginia Electric and Power Company |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Project Cost |  | $ 77 | $ 75 | $ 35
Virginia Electric and Power Company | Acquisition of Solar Project Grasshopper in Virginia |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Date Agreement Entered | [6] | 2018-08 |  |
Date Agreement Closed | [6] | 2019-05 |  |
Project Cost | [6],[7] | $ 128 |  |
Date of Commercial Operations | [6] | October 2020 |  |
MW Capacity | MW | [6] | 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 | [7] | $ 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 | [7] | $ 267 |  |
Date of Commercial Operations |  | January 2022 |  |
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 | [8] | 2019-06 |  |
Date Agreement Closed | [8] | 2019-08 |  |
Project Cost | [7],[8] | $ 164 |  |
Date of Commercial Operations | [8] | June 2021 |  |
MW Capacity | MW | [8] | 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 | [7] | $ 106 |  |
Date of Commercial Operations |  | November 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 | [7] | $ 210 |  |
Date of Commercial Operations |  | December 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 | [7] | $ 35 |  |
Date of Commercial Operations |  | December 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 | [7] | $ 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 | [7] | $ 225 |  |
Date of Commercial Operations | [9] | Expected 2023 |  |
MW Capacity | MW |  | 127 |  |
[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] | In January 2023, Dominion Energy terminated its agreement, without penalty, to acquire Hardin II.
[5] | Expected to be split between 2023 and 2024.
[6] | Referred to as Butcher Creek once placed in service.
[7] | Includes acquisition costs.
[8] | Referred to as Desper once placed in service.
[9] | Virginia Power expects to claim production tax credits on the energy generated and sold by project.

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