XML 121 R105.htm IDEA: XBRL DOCUMENT
v3.20.2

Regulatory Matters (Narrative) (Detail) $ in Millions |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 01, 2020 USD ($) | Oct. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) mi | Aug. 31, 2020 USD ($) | Jul. 31, 2020 USD ($) GW | Jun. 30, 2020 USD ($) | May 31, 2020 USD ($) kV | Apr. 30, 2020 USD ($) MW GW | Mar. 31, 2020 USD ($) | Feb. 29, 2020 USD ($) kV mi | Jan. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) a kV ServiceLine mi | Nov. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jul. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Jul. 31, 2018 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2008 | Jan. 31, 2019 USD ($)
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of new demand response programs | a |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |
Pipeline Integrity and Safety Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate year beginning |  |  |  |  |  |  |  |  | 2020-03 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rider DSM |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approval date |  |  |  |  |  |  |  | 2020-04 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Application date |  |  |  |  |  |  |  |  |  |  | 2020-01 |  |  |  |  |  |  |  |  |  |  |  |
Cost of Fuel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate year beginning |  |  |  |  |  |  |  |  |  | 2020-05 |  |  |  |  |  |  |  |  |  |  |  |  |
Approval date |  |  |  |  |  |  |  | 2020-04 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Application date |  |  |  |  |  |  |  |  |  | 2020-02 |  |  |  |  |  |  |  |  |  |  |  |  |
PIR Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of pipeline system replaced |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |
PREP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate year beginning |  |  |  |  |  |  | 2020-11 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Application date |  |  |  |  |  |  | 2020-05 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Target to Reach by End of 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Energy efficiency target percentage. based on energy savings from 2019 baseline |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Rider US-4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue requirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12 |  |  |  |  |
Rate year beginning |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2021-06 |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4 |  |  |  |  |
Application date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2020-07 |  |  |  |  |
Virginia Electric and Power Company | Riders C1A C2A and C3A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  |  |  |  |  |  |  |  |  | $ 11 |  |  |  |  |  |  |  |  |  |  |
Amount of cost recovery |  |  |  |  |  |  |  |  |  |  |  | 186 |  |  |  |  |  |  |  |  |  |  |
Virginia Power | Grassfield Solar, Norge Solar and Sycamore Solar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted capacity provided by legislation | GW |  |  |  |  | 82 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed cost of project |  |  |  |  | $ 170 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Power | Grassfield Solar, Norge Solar and Sycamore Solar | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, projects proposed revenue requirement |  | $ 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy South Carolina Inc | Transmission Lines in Aiken County South Carolina |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost of project |  |  |  |  |  |  |  |  |  | $ 30 |  |  |  |  |  |  |  |  |  |  |  |  |
Ohio Regulation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract with customer credits tax reform |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600 |  |
Tax Reform Act's impact on its equity return |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19 |  |
Ohio Regulation | PIR Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved annual revenue required |  |  |  |  |  |  |  | $ 218 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total estimated cost |  |  |  |  |  |  |  |  |  |  |  | 209 |  |  |  |  |  |  |  |  | 209 |  |
Total cumulative estimated cost |  |  |  |  |  |  |  | $ 1,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Regulation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of electric energy excluding existing nuclear generation and certain new carbon resources |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cap on revenue reductions in the first triennial |  |  |  |  |  |  |  | $ 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Regulation | Virginia Electric and Power Company | Annual Fuel Factor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue requirement |  |  |  |  |  |  |  |  |  | $ 1,200 |  |  |  |  |  |  |  |  |  |  |  |  |
Rate year beginning |  |  |  |  |  |  |  |  | 2020-05 | 2020-07 |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement recovered balance |  |  |  |  |  | $ 103 |  |  |  | $ 81 |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  |  |  |  |  |  | $ (393) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approval date |  |  |  |  |  | 2020-06 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Regulation | Virginia Electric and Power Company | Rider T1 | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved annual revenue required |  |  |  |  |  |  | $ 73 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue requirement |  |  |  |  |  |  | $ 529 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approval date |  |  |  |  |  |  | 2020-07 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Application date |  |  |  |  |  |  | 2020-05 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning date of total revenue requirement |  |  |  |  |  |  | Sep. 01, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Regulation | Virginia Electric and Power Company | Riders C1A C2A and C3A | Operating Segments | Energy Efficiency Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved annual revenue required |  |  |  |  |  |  |  |  |  |  |  | $ 60 |  |  |  |  |  |  |  |  |  |  |
Number of new energy efficiency programs | a |  |  |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |
Period for cost cap |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Virginia Regulation | Virginia Electric and Power Company | Rider U |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  |  |  | $ 28 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Projected capital investment |  |  |  |  |  | 80 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Regulation | Virginia Electric and Power Company | GTSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed cost of project |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 503 |  |  |  |  |  |  |  |  |
Estimated cost of project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 816 |  |  |  |  |  | $ 68
Operations and maintenance expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 78 |  |  | $ 102 |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  |  |  |  |  |  | 212 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Regulation | Virginia Electric and Power Company | Transmission Component of Virginia Power's | Rider T1 | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue requirement |  |  |  |  |  |  | $ 474 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Regulation | Virginia Electric and Power Company | Fifth Phase | Rider U |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Projected capital investment |  |  |  |  |  | 36 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Regulation | Virginia Electric and Power Company | Previous Phase | Rider U |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Projected capital investment |  |  |  |  |  | 44 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Regulation | Virginia Electric and Power Company | Solar and Onshore Wind | Target to Reach by End of 2035 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted capacity provided by legislation | GW |  |  |  |  |  |  |  | 16.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Regulation | Virginia Electric and Power Company | Utility-scale Solar | Target to Reach by End of 2035 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted capacity provided by legislation | GW |  |  |  |  |  |  |  | 15.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Regulation | Virginia Electric and Power Company | Utility-scale Solar | Target to Reach by End of 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted capacity provided by legislation | GW |  |  |  |  |  |  |  | 3.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Regulation | Virginia Electric and Power Company | Small-scale Solar | Target to Reach by End of 2035 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted capacity provided by legislation | GW |  |  |  |  |  |  |  | 1.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Regulation | Virginia Electric and Power Company | Energy Storage | Target to Reach by End of 2035 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted capacity provided by legislation | MW |  |  |  |  |  |  |  | 2,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Regulation | Virginia Electric and Power Company | Offshore Wind Facility | Target to Reach by End of 2035 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted capacity provided by legislation | MW |  |  |  |  |  |  |  | 5,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Constructed by utility capacity | MW |  |  |  |  |  |  |  | 3,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Regulation | Virginia Electric and Power Company | Offshore Wind Facility | Target to Reach by End of 2035 | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Constructed by utility capacity | MW |  |  |  |  |  |  |  | 2,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Regulation | Virginia Electric and Power Company | Pumped Storage | Target to Reach by End of 2035 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted capacity provided by legislation | MW |  |  |  |  |  |  |  | 800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Regulation | Virginia Electric and Power Company | Solar Development Project | Rider US-4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost of project |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 146 |  |  |  |  |  |  |  |
Proposed revenue requirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9 |  |  |  |  |  |  |  |
Solar capacity factor when normalized for force majeure events |  |  |  |  |  |  |  |  |  |  | 22.00% |  |  |  |  |  |  |  |  |  |  |  |
Approved annual revenue required |  |  |  |  |  |  |  |  | $ 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Regulation | Virginia Electric and Power Company | Electric Transmission Projects | Brambleton-Yardley Ridge line and Brambleton-Poland Road line in Loudoun County, Virginia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost of project |  |  |  |  |  |  |  |  |  |  |  | $ 30 |  |  |  |  |  |  |  |  | 30 |  |
Capacity of transmission line (kV) | kV |  |  |  |  |  |  |  |  |  |  |  | 230 |  |  |  |  |  |  |  |  |  |  |
Virginia Regulation | Virginia Electric and Power Company | Electric Transmission Projects | Brambleton-Yardley Ridge line |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost of project |  |  |  |  |  |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of transmission line (kV) | kV |  |  |  |  |  |  | 230 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal Energy Regulatory Commission | Virginia Electric and Power Company | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue requirement |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
North Carolina Regulation | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  | $ 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage |  |  |  |  |  |  |  |  |  |  | 9.75% |  |  |  |  |  |  |  |  |  |  |  |
North Carolina Regulation | Virginia Electric and Power Company | Base Rate Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 24 |  | $ 27 |  |  |  |  |  |  |
Percentage of earned return |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.52% |  |  |  |  |  |  |
Authorized return percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.90% |  |  |  |  |  |  |
Return of equity percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.75% |  |  |  |  |  |  |
North Carolina Regulation | PSNC | Pipeline Integrity and Safety Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue requirement |  |  |  |  |  |  |  |  |  | 28 |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  |  |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |
South Carolina Regulation | Gas Rate Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue requirement |  |  |  |  |  | $ 409 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9 |  |  |  |  |
Return of equity percentage |  |  |  |  |  | 10.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return percentage |  |  |  |  |  | 9.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
South Carolina Regulation | Subsequent Event | Gas Rate Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue requirement |  | 406 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  | $ 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
South Carolina Regulation | South Carolina Electric Base Rate Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  | $ 178 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return of equity percentage |  |  |  | 5.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage |  |  |  | 10.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement, percentage |  |  |  | 7.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
South Carolina Regulation | Dominion Energy South Carolina Inc | Rider DSM |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual transportation cost rate adjustment, approval amount requested to recover amount |  |  |  |  |  |  |  |  |  |  | $ 40 |  |  |  |  |  |  |  |  |  |  |  |
South Carolina Regulation | Dominion Energy South Carolina Inc | Cost of Fuel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase decrease in annual base fuel component recoveries |  |  |  |  |  |  |  |  |  | $ 44 |  |  |  |  |  |  |  |  |  |  |  |  |
South Carolina Regulation | Dominion Energy South Carolina Inc | Transmission Lines in Aiken County South Carolina |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of transmission line (kV) | kV |  |  |  |  |  |  |  |  |  | 230 |  |  |  |  |  |  |  |  |  |  |  |  |
Length of kV line (miles | mi |  |  |  |  |  |  |  |  |  | 28 |  |  |  |  |  |  |  |  |  |  |  |  |
South Carolina Regulation | Dominion Energy South Carolina Inc | Scenario Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost of project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 75 |  |  |
West Virginia Regulation | South Carolina Electric Base Rate Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  | $ 28 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return of equity percentage |  |  | 10.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage |  |  | 9.45% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities distribution infrastructure gathering assets | mi |  |  | 2,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
West Virginia Regulation | Hope Gas, Inc. | PREP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of cost recovery |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 27 |  |
West Virginia Regulation | Hope Gas, Inc. | Scenario Forecast | PREP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of cost recovery | $ 13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Projected capital investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 54 | $ 39 |  |  |
Utah Regulation | Rural Expansion Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, high-pressure pipeline | mi |  |  |  |  |  |  |  |  |  |  |  | 11 |  |  |  |  |  |  |  |  |  |  |
Public utilities, number of service pipeline | ServiceLine |  |  |  |  |  |  |  |  |  |  |  | 360 |  |  |  |  |  |  |  |  |  |  |
Wyoming Base Rate Case | Questar Gas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2 |  |  |  |  |
Return of equity percentage |  |  |  |  |  |  |  |  |  |  |  |  | 10.50% |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.35% |  |  |  |  |
Authorized return percentage |  |  |  |  |  |  |  |  |  |  |  |  | 9.50% |  |  |  |  |  |  |  |  |  |
Base fuel cost |  |  |  |  |  |  |  |  |  |  |  |  | $ 4 |  |  |  |  |  |  |  |  |  |
Percentage of earned return |  |  |  |  |  |  |  |  |  |  |  |  | 7.46% |  |  |  |  |  |  |  |  |  |

X
- Definition Application date of public utilities transmission. + References No definition available. + Details
Name: | d_ApplicationDateOfPublicUtilitiesTransmission
Namespace Prefix: | d_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Approval date of public utilities regulatory filing. + References No definition available. + Details
Name: | d_ApprovalDateOfPublicUtilitiesRegulatoryFiling
Namespace Prefix: | d_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cap amount on revenue reductions in first triennial. + References No definition available. + Details
Name: | d_CapAmountOnRevenueReductionsInFirstTriennial
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Contract With Customer Credits tax reform. + References No definition available. + Details
Name: | d_ContractWithCustomerCreditsTaxReform
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Electric transmission projects costs. + References No definition available. + Details
Name: | d_ElectricTransmissionProjectsCosts
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Impact on equity return component of rates charged. + References No definition available. + Details
Name: | d_ImpactOnEquityReturnComponentOfRatesCharged
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increase decrease in annual base fuel component recoveries. + References No definition available. + Details
Name: | d_IncreaseDecreaseInAnnualBaseFuelComponentRecoveries
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Kilo Volt Line + References No definition available. + Details
Name: | d_KiloVoltLine
Namespace Prefix: | d_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of electric energy excluding existing nuclear generation and certain new carbon resources. + References No definition available. + Details
Name: | d_PercentageOfElectricEnergyExcludingExistingNuclearGenerationAndCertainNewCarbonResources
Namespace Prefix: | d_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of energy efficiency target based on energy savings from previous year baseline. + References No definition available. + Details
Name: | d_PercentageOfEnergyEfficiencyTargetBasedOnEnergySavingsFromPreviousYearBaseline
Namespace Prefix: | d_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of pipeline system replaced. + References No definition available. + Details
Name: | d_PercentageOfPipelineSystemReplaced
Namespace Prefix: | d_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Phase-in plan, amount of capitalized costs recoverable. + References No definition available. + Details
Name: | d_PhaseInPlanAmountOfCapitalizedCostsRecoverable
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Power generation constructed by utility capacity. + References No definition available. + Details
Name: | d_PowerGenerationConstructedByUtilityCapacity
Namespace Prefix: | d_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Power generation, targeted capacity provided by legislation. + References No definition available. + Details
Name: | d_PowerGenerationTargetedCapacityProvidedByLegislation
Namespace Prefix: | d_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public utilities actual earned return on equity percentage. + References No definition available. + Details
Name: | d_PublicUtilitiesActualEarnedReturnOnEquityPercentage
Namespace Prefix: | d_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public utilities actual rate increase (decrease) percentage. + References No definition available. + Details
Name: | d_PublicUtilitiesActualRateIncreaseDecreasePercentage
Namespace Prefix: | d_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public utilities annual transportation cost rate adjustment approval request to recover amount. + References No definition available. + Details
Name: | d_PublicUtilitiesAnnualTransportationCostRateAdjustmentApprovalRequestToRecoverAmount
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Public utilities, approved rate, amount. + References No definition available. + Details
Name: | d_PublicUtilitiesApprovedRateAmount
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Public utilities authorized rate percentage. + References No definition available. + Details
Name: | d_PublicUtilitiesAuthorizedRatePercentage
Namespace Prefix: | d_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public utilities authorized return on equity percentage. + References No definition available. + Details
Name: | d_PublicUtilitiesAuthorizedReturnOnEquityPercentage
Namespace Prefix: | d_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public utilities cumulative property plant and equipment amount of construction work in process included in rate base. + References No definition available. + Details
Name: | d_PublicUtilitiesCumulativePropertyPlantAndEquipmentAmountOfConstructionWorkInProcessIncludedInRateBase
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Public Utilities distribution infrastructure gathering assets. + References No definition available. + Details
Name: | d_PublicUtilitiesDistributionInfrastructureGatheringAssets
Namespace Prefix: | d_
Data Type: | num:lengthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, high-pressure pipeline. + References No definition available. + Details
Name: | d_PublicUtilitiesHighPressurePipeline
Namespace Prefix: | d_
Data Type: | num:lengthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public utilities, length of transmission line. + References No definition available. + Details
Name: | d_PublicUtilitiesLengthOfTransmissionLine
Namespace Prefix: | d_
Data Type: | num:lengthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public utilities number of new demand response programs. + References No definition available. + Details
Name: | d_PublicUtilitiesNumberOfNewDemandResponsePrograms
Namespace Prefix: | d_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public utilities, number of new energy efficiency programs. + References No definition available. + Details
Name: | d_PublicUtilitiesNumberOfNewEnergyEfficiencyPrograms
Namespace Prefix: | d_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, number of service pipeline. + References No definition available. + Details
Name: | d_PublicUtilitiesNumberOfServicePipeline
Namespace Prefix: | d_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public utilities operating expense estimated fuel expenses recovered balance. + References No definition available. + Details
Name: | d_PublicUtilitiesOperatingExpenseEstimatedFuelExpensesRecoveredBalance
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Public utilities operating expense estimated fuel expenses recovery. + References No definition available. + Details
Name: | d_PublicUtilitiesOperatingExpenseEstimatedFuelExpensesRecovery
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Public utilities, period for cost capitalization. + References No definition available. + Details
Name: | d_PublicUtilitiesPeriodForCostCapitalization
Namespace Prefix: | d_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public utilities, projects proposed revenue requirement. + References No definition available. + Details
Name: | d_PublicUtilitiesProjectsProposedRevenueRequirement
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Public utilities, property, plant and equipment, expected cost of construction. + References No definition available. + Details
Name: | d_PublicUtilitiesPropertyPlantAndEquipmentExpectedCostOfConstruction
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Public utilities property plant and equipment requested cost of construction. + References No definition available. + Details
Name: | d_PublicUtilitiesPropertyPlantAndEquipmentRequestedCostOfConstruction
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Public Utilities, Requested Rate, Amount + References No definition available. + Details
Name: | d_PublicUtilitiesRequestedRateAmount
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Public utilities start date of proposed application. + References No definition available. + Details
Name: | d_PublicUtilitiesStartDateOfProposedApplication
Namespace Prefix: | d_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public utilities, start date of proposed rate in month and year. + References No definition available. + Details
Name: | d_PublicUtilitiesStartDateOfProposedRate
Namespace Prefix: | d_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Solar Capacity Factor + References No definition available. + Details
Name: | d_SolarCapacityFactor
Namespace Prefix: | d_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fuel costs incurred that are directly related to goods produced and sold and services rendered during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
Name: | us-gaap_FuelCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The increase (decrease) during the period in the costs deferred for rate-making purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44264-110382 + Details
Name: | us-gaap_PhaseInPlanNetChangeInAmountOfCostsDeferredForRateMakingPurposes
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of public utility's approved rate increase (decrease) by regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesApprovedRateIncreaseDecreaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of public utility's approved return on equity. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesApprovedReturnOnEquityPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Discloses the amount of construction work in process that is included in the rate making process at period end. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfConstructionWorkInProcessIncludedInRateBase
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of public utility's requested rate increase (decrease) with regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of public utility's requested rate increase (decrease) with regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedRateIncreaseDecreasePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of public utility's requested return on equity. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedReturnOnEquityPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of operating expense for routine plant maintenance and repairs of regulated operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(b)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
Name: | us-gaap_UtilitiesOperatingExpenseMaintenance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=d_PipelineIntegrityAndSafetyProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=d_RiderDSMMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=d_CostOfFuelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=d_PIRProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=d_PipelineReplacementAndExpansionProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=d_TargetedToReachByEndOfYearFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=d_VirginiaElectricAndPowerCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=d_RideUS4Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=d_RidersC1aC2aAndC3aMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=d_VirginiaPowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=d_GrassfieldSolarNorgeSolarAndSycamoreSolarMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=d_DominionEnergySouthCarolinaIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=d_TransmissionLinesInAikenCountySouthCarolinaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=d_OhioRegulationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=d_VirginiaRegulationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=d_AnnualFuelFactorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=d_RiderT1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=d_EnergyEfficiencyProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=d_RiderUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=d_GridTransformationAndSecurityActMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=d_TransmissionComponentOfVirginiaPowersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=d_FifthPhaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=d_PreviousPhaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=d_SolarAndOnshoreWindMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=d_TargetedToReachByEndOfYearOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=d_UtilityScaleSolarMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=d_TargetedToReachByEndOfYearTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=d_SmallScaleSolarMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=d_EnergyStorageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=d_OffshoreWindFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=d_PumpedStorageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=d_SolarDevelopmentProjectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=d_ElectricTransmissionProjectsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=d_BrambletonYardleyRidgeLineAndBrambletonPolandRoadLineInLoudounCountyVirginiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=d_BrambletonYardleyRidgeLineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=d_FederalEnergyRegulatoryCommissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=d_NorthCarolinaRegulationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=d_BaseRateCaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=d_PublicServiceCompanyOfNorthCarolinaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=d_SouthCarolinaRegulationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=d_GasRateCaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=d_SouthCarolinaElectricBaseRateCaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=d_WestVirginiaRegulationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=d_WestVirginiaBaseRateCaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=d_HopeGasIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=d_UtahRegulationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=d_RuralExpansionProjectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=d_WyomingBaseRateCaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=d_QuestarGasCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |