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Regulatory Matters (Narrative) (Detail) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2020 USD ($) MW GW | Mar. 31, 2020 USD ($) | Feb. 29, 2020 USD ($) | Jan. 31, 2020 USD ($) | Sep. 30, 2019 USD ($) | Jul. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Jul. 31, 2018 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2008 | Jan. 31, 2019 USD ($)
Virginia Electric and Power Company | Rider US-3 |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved cost of project |  |  |  |  |  |  |  |  | $ 18 |  |  |
Total annual revenue requirement |  |  |  |  |  |  |  |  | $ 28 |  |  |
East Ohio | Pipeline Infrastructure Replacement Program |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of pipeline system replaced |  |  |  |  |  |  |  |  |  |  | 25.00% |
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 | Subsequent Event | East Ohio | Pipeline Infrastructure Replacement Program |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total annual revenue requirement | $ 218 |  |  |  |  |  |  |  |  |  |  |
Total estimated cost | 209 |  |  |  |  |  |  |  |  |  |  |
Total cumulative estimated cost | $ 1,800 |  |  |  |  |  |  |  |  |  |  |
Virginia Regulation | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement |  |  | $ 1,200 |  |  |  |  |  |  |  |  |
Proposed revenue requirement recovered balance |  |  | 81 |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  | $ (393) |  |  |  |  |  |  |  |  |  |
Virginia Regulation | Virginia Electric and Power Company | GTSA |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost of project |  |  |  |  |  |  |  | $ 816 |  |  |  | $ 68
Operations and maintenance expenses |  |  |  |  | $ 78 |  |  | $ 102 |  |  |  |
Proposed cost of project |  |  |  |  | 503 |  |  |  |  |  |  |
Approved cost of project |  | 212 |  |  |  |  |  |  |  |  |  |
Virginia Regulation | Virginia Electric and Power Company | Solar Development Project | Rider US-3 | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
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 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
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 | Subsequent Event | Virginia Electric and Power Company | 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 Regulation | Subsequent Event | 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 | Subsequent Event | 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 | Subsequent Event | 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 | Subsequent Event | 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 | Subsequent Event | 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 | Subsequent Event | 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 | Subsequent Event | 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 | Subsequent Event | 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 |  |  |  |  |  |  |  |  |  |  |
North Carolina Regulation | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of earned return |  |  |  |  |  |  | 7.52% |  |  |  |  |
Authorized return percentage |  |  |  |  |  |  | 9.90% |  |  |  |  |
Return of equity percentage |  |  |  |  |  |  | 10.75% |  |  |  |  |
Approved return on equity percentage |  |  |  | 9.75% |  |  |  |  |  |  |  |
North Carolina Regulation | Virginia Electric and Power Company | Annual Base Fuel Revenues |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  |  | $ 24 |  | $ 27 |  |  |  |  |
North Carolina Regulation | PSNC | Pipeline Integrity Tracker |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  | 7 |  |  |  |  |  |  |  |  |
Total annual revenue requirement |  |  | 28 |  |  |  |  |  |  |  |  |
South Carolina Regulation | Dominion Energy South Carolina Inc |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Annual transportation cost rate adjustment, approval amount requested to recover amount |  |  |  | $ 40 |  |  |  |  |  |  |  |
Increase decrease in annual base fuel component recoveries |  |  | $ 44 |  |  |  |  |  |  |  |  |
Federal Energy Regulatory Commission | Cove Point | Atlantic Coast Pipeline |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Annual cost-of-service, amount |  |  |  | $ 182 |  |  |  |  |  |  |  |
Federal Energy Regulatory Commission | Cove Point | Supply Header Project | Atlantic Coast Pipeline |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Annual transportation cost rate adjustment, approval amount requested to recover amount |  | $ 28 |  |  |  |  |  |  |  |  |  |

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