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Regulatory Matters (Narrative) (Detail) $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Nov. 01, 2020 USD ($) | Jun. 30, 2020 USD ($) | 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 | Nov. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jul. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Jul. 31, 2018 USD ($) | Jun. 30, 2020 USD ($) GW | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 531 | $ 312 | $ 1,299 | $ 1,147 |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 44 | 197 | 808 | 743 |  |  |  |  |
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 |  |  |  |  |  |  |  |
Dominion Energy South Carolina Inc | Transmission Lines in Aiken County South Carolina |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost of project |  |  |  |  |  | $ 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DETI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 482 |  |  |  |  |  |
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 | General Rate Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual cost-of-service, amount |  |  |  |  |  |  | $ 182 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal Energy Regulatory Commission | Electric Power Cost Adjustment | Atlantic Coast Pipeline |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue requirement |  |  |  |  | $ 28 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal Energy Regulatory Commission | Virginia Electric and Power Company | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue requirement |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal Energy Regulatory Commission | Overthrust |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected cost of project |  |  | $ 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal Energy Regulatory Commission | DETI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 |  |  |  |  |  |  |
Asset impairment after tax charge |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10 |  | $ 10 |  |  |  |  |
North Carolina Regulation | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |
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 | 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 |  |  |
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% |  |  |  |  |  |
Base fuel cost |  |  |  |  |  |  |  |  | $ 4 |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of earned return |  |  |  |  |  |  |  |  | 7.46% |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return percentage |  |  |  |  |  |  |  |  | 9.50% |  |  |  |  |  |  |  |  |  |  |  |  |

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