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Regulatory Matters (Narrative) (Detail 4) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2023 USD ($) | Oct. 31, 2023 USD ($) MW | Jul. 31, 2023 USD ($) | May 31, 2023 USD ($) | Apr. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Feb. 28, 2023 USD ($) | Oct. 31, 2022 MW | May 31, 2022 USD ($) | Oct. 31, 2021 USD ($) | Apr. 30, 2020 MW | Dec. 31, 2011 | Mar. 31, 2023 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2008
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return percentage |  |  | 9.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |
North Carolina Regulation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approval date |  |  |  |  |  | 2023-03 |  |  |  |  |  |  |  |  |  |  |
Ohio Regulation | Base Rate Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of proposed earned return |  | 10.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in non-fuel base rate |  | $ 212 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return percentage |  | 10.38% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ohio Regulation | PIR Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue requirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 305 |
Approval date of application |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2023-04 |  |
Percentage of pipeline system replaced |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00%
Total gross plant investment estimated cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 225 |
Cumulative gross plant investment estimated cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,400 |
Increases of annual capital expenditures percentage |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |
Ohio Regulation | CEP Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue requirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 151 |  |
Total gross plant investment estimated cost | $ 195 |  |  |  |  |  |  |  |  |  |  |  |  |  | 195 |  |
Cumulative gross plant investment estimated cost | 1,300 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,300 |  |
Percentage of debt rate on capital investments |  |  |  |  |  |  |  |  |  |  |  | 6.50% |  |  |  |  |
Application date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2023-09 |  |
Ohio Regulation | UEX Rider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual revenue requirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23 |  |
Public utilities, under-recovered accumulated bad debt expense |  |  |  |  |  |  |  |  |  |  |  |  | $ 9 |  |  |  |
Ohio Regulation | Forecast | UEX Rider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery of bad debt expense |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14 |  |  |
Virginia Electric and Power Company | Annual Fuel Factor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  | $ 13 |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Utility-scale Solar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted capacity provided by legislation | MW |  | 329 |  |  |  |  |  | 474 |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  |  |  |  |  |  |  | $ 330 |  |  |  |  |  |  |
Authorized return percentage |  |  | 9.70% |  | 9.70% |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Annual Fuel Factor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  |  |  |  |  |  | $ 1,800 |  |  |  |  |  |  |  |
Total revenue requirement |  |  |  | 2,300 |  |  |  |  | 2,300 |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Base Rate Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  |  |  |  |  |  |  | $ 50 |  |  |  |  |  |  |
Authorized return percentage |  |  |  |  |  |  |  |  |  | 9.35% |  |  |  |  |  |  |
Total revenue requirement |  |  | $ 350 | $ 351 | $ 350 |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Maximum | Annual Fuel Factor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  |  |  |  |  |  | 1,300 |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Minimum | Annual Fuel Factor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  |  |  |  |  |  | $ 1,200 |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Offshore Wind Facility | End of Year 2035 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Constructed by utility capacity | MW |  |  |  |  |  |  |  |  |  |  | 3,000 |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Offshore Wind Facility | End of Year 2035 | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Constructed by utility capacity | MW |  |  |  |  |  |  |  |  |  |  | 2,500 |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Offshore Wind Facility | Before 2035 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted capacity provided by legislation | MW |  |  |  |  |  |  |  |  |  |  | 5,200 |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Utility-scale Solar | End of Year 2035 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted capacity provided by legislation | MW |  |  |  |  |  |  |  |  |  |  | 15,000 |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Pumped Storage | End of Year 2035 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted capacity provided by legislation | MW |  |  |  |  |  |  |  |  |  |  | 800 |  |  |  |  |  |
Questar Gas Company | Utah Regulation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approval date |  |  |  |  |  |  | 2023-02 |  |  |  |  |  |  |  |  |  |
Increase (decrease) in gas cost |  |  |  |  |  | $ 92 | $ 164 |  |  |  |  |  |  |  |  |  |
Percentage of adjustments of distribution non-gas revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |
Decrease in non-gas cost | $ 27 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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