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Derivatives and Hedge Accounting Activities (Volume of Derivative Activity) (Detail) - 12 months ended Dec. 31, 2024 | USD ($) MWh Bcf | DKK (kr) | EUR (€)
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Fixed Price - Natural Gas - Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | Bcf | [1] | 31 |  |
Fixed Price - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | Bcf | [1] | 31 |  |
Basis - Natural Gas - Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | Bcf | [2] | 178 |  |
Basis - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | Bcf | [2] | 146 |  |
Fixed Price - Electricity - Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh |  | 18 |  |
Fixed Price - Electricity - Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh |  | 9 |  |
Financial Transmission Rights - Electricity- Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh |  | 45 |  |
Financial Transmission Rights - Electricity- Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh |  | 45 |  |
Interest Rate - Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | $ | [3] | $ 2,078,000,000 |  |
Interest Rate - Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | $ | [3] | $ 1,077,000,000 |  |
Foreign Currency Exchange Rate - Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | [3] |  | kr 1,741,000,000 | € 293,000,000
Foreign Currency Exchange Rate - Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | [3] |  | 1,741,000,000 | 293,000,000
Fixed Price - Natural Gas - Non-current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | Bcf | [1] | 21 |  |
Fixed Price - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | Bcf | [1] | 21 |  |
Basis - Natural Gas - Non-current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | Bcf | [2] | 333 |  |
Basis - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | Bcf | [2] | 303 |  |
Fixed Price - Electricity - Non-current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh |  | 30 |  |
Fixed Price - Electricity - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh |  | 0 |  |
Financial Transmission Rights - Electricity- Non-current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh |  | 0 |  |
Financial Transmission Rights - Electricity- Non-current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh |  | 0 |  |
Interest Rate - Non-current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | $ | [3] | $ 8,735,000,000 |  |
Interest Rate - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | $ | [3] | $ 2,673,000,000 |  |
Foreign Currency Exchange Rate - Non-current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | [3] |  | 826,000,000 | 832,000,000
Foreign Currency Exchange Rate - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | [3] |  | kr 826,000,000 | € 832,000,000
[1] | Includes options at Dominion Energy.
[2] | Includes options.
[3] | Maturity is determined based on final settlement period.

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