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Regulatory Matters (Narrative) (Detail 3) - South Carolina Regulation $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 27, 2025 USD ($) | Jan. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) mi kV | Sep. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) mi kV | Jan. 31, 2024 USD ($) | Jul. 31, 2023 USD ($) | Mar. 31, 2023 | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
One-time bill credit |  |  | $ 7 |  |  |  |  |  |  | $ 7
Impairment of assets and other charges (benefits) |  |  |  |  |  |  |  |  | $ 58 |
Impairment of assets and other charges (benefits) after tax |  |  |  |  |  |  |  |  | 44 |
Materials and supplies inventory write down |  |  |  |  |  |  |  |  | 50 |
Materials and fuel purchase |  |  |  |  |  |  |  |  | $ 50 |
Electric Base Rate Case |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  |  |  |  | $ 219 |  |  |
Percentage of earned return |  |  |  |  | 4.32% |  |  |  |  |
Requested return on equity percentage |  |  |  |  |  |  | 9.94% |  |  |
Percentage of proposed earned return |  |  |  |  |  |  |  | 10.60% |  |
Authorized return percentage |  |  |  |  | 9.50% |  |  |  |  |
Dominion Energy South Carolina Inc | Subsequent Event |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Increase (decrease) in annual base fuel component recoveries | $ 154 |  |  |  |  |  |  |  |  |
Dominion Energy South Carolina Inc | Electric DSM Programs |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Public energy efficiency programs cost rate adjustment approval request to recover amount |  |  |  |  |  | $ 47 |  |  |  |
Dominion Energy South Carolina Inc | Electric DSM Programs | Subsequent Event |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Public energy efficiency programs cost rate adjustment approval request to recover amount |  | $ 46 |  |  |  |  |  |  |  |
Dominion Energy South Carolina Inc | Electric Base Rate Case |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  | $ 291 | $ 295 |  |  |  |  |
Increase (decrease) in net of storm damage |  |  |  |  |  | $ 4 |  |  |  |
Increase in proposed base rate percentage |  |  |  | 12.59% |  |  |  |  |  |
Dominion Energy South Carolina Inc | Cost of Fuel |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Proposed increase (decrease) in annual base fuel component recoveries |  |  |  |  |  |  |  |  |  | 315
Increase (decrease) in annual base fuel component recoveries |  |  |  |  | 316 |  |  |  |  |
Dominion Energy South Carolina Inc | Electric Transmission Project |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Cost Estimate |  |  | $ 55 |  | $ 40 |  |  |  |  | $ 55
Miles of Lines | mi |  |  | 17 |  | 7 |  |  |  |  |
Type of Line | kV |  |  | 230 |  | 230 |  |  |  |  |

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