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Regulatory Matters (Narrative) (Detail) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
May 31, 2022 USD ($) | Apr. 30, 2022 USD ($) | Jan. 31, 2022 USD ($) | Sep. 30, 2021 USD ($) MW | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2008 | Mar. 31, 2022 USD ($)
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory liabilities |  |  |  |  | $ 986 | [1] |  |  |  | $ 830
Ohio Regulation | PIR Program |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of pipeline system replaced |  |  |  |  |  |  |  |  | 25.00% |
Total gross plant investment estimated cost |  |  |  |  | 225 |  |  |  |  |
Proposed revenue requirement |  |  |  |  | 273 |  |  |  |  |
Cumulative gross plant investment estimated cost |  |  |  |  | 2,200 |  |  |  |  |
Ohio Regulation | CEP Program |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Total gross plant investment estimated cost |  |  |  |  | 140 |  | $ 231 | $ 231 |  |
Proposed revenue requirement |  |  |  |  | 137 |  | 118 | 118 |  |
Cumulative gross plant investment estimated cost |  |  |  |  | 1,100 |  | $ 952 | $ 952 |  |
Ohio Regulation | Subsequent Event | PIR Program |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Increases of annual capital expenditures percentage |  | 3.00% |  |  |  |  |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Proposed cost of project |  |  |  | $ 1,400 |  |  |  |  |  |
Regulatory liabilities |  |  |  |  | $ 647 | [2] |  |  |  | $ 460
Virginia Electric and Power Company | Utility Scale Solar Generation |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Targeted capacity provided by legislation | MW |  |  |  | 661 |  |  |  |  |  |
Virginia Electric and Power Company | Energy Storage |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Targeted capacity provided by legislation | MW |  |  |  | 70 |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Annual Fuel Factor | Subsequent Event |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Total revenue requirement | $ 2,300 |  |  |  |  |  |  |  |  |
Rate year beginning | 2022-07 |  |  |  |  |  |  |  |  |
Estimated under-recovered balances | $ 1,000 |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement | 1,800 |  |  |  |  |  |  |  |  |
Fuel cost recognized | 155 |  |  |  |  |  |  |  |  |
Estimated under-unrecovered balances | 215,000 |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Annual Fuel Factor | Maximum | Subsequent Event |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement | 1,300 |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Annual Fuel Factor | Minimum [Member] | Subsequent Event |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement | 1,200 |  |  |  |  |  |  |  |  |
Dominion Energy South Carolina Inc | South Carolina Regulation | Rider DSM |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Annual transportation cost rate adjustment, approval amount requested to recover amount |  |  | $ 60 |  |  |  |  |  |  |
Application date |  |  | 2022-04 |  |  |  |  |  |  |
Dominion Energy South Carolina Inc | South Carolina Regulation | Subsequent Event | Cost Of Fuel |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Rate year beginning |  | 2022-05 |  |  |  |  |  |  |  |
Application date |  | 2022-04 |  |  |  |  |  |  |  |
Regulatory liabilities |  | $ 66 |  |  |  |  |  |  |  |
Increase (decrease) in annual base fuel component recoveries |  | $ 143 |  |  |  |  |  |  |  |
Questar Gas Company | Utah Regulation | Subsequent Event | Base Rate Case |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement | $ 71 |  |  |  |  |  |  |  |  |
Percentage of earned return | 10.30% |  |  |  |  |  |  |  |  |
Authorized return percentage | 9.50% |  |  |  |  |  |  |  |  |
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2021 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Virginia Power’s Consolidated Balance Sheet at December 31, 2021 has been derived from the audited Consolidated Balance Sheet at that date.

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