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Derivatives and Hedge Accounting Activities (Volume of Derivative Activity) (Detail) - 9 months ended Sep. 30, 2023 € in Millions, kr in Millions, $ in Millions | USD ($) MWh Bcf | DKK (kr) | EUR (€)
--- | --- | --- | ---
Fixed Price - Natural Gas - Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh | [1] | 45 |  |
Fixed Price - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh | [1] | 35 |  |
Basis - Natural Gas - Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | Bcf | [2] | 179 |  |
Basis - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | Bcf | [2] | 149 |  |
Fixed Price - Electricity - Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | Bcf |  | 17 |  |
Fixed Price - Electricity - Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | Bcf |  | 8 |  |
Financial Transmission Rights - Electricity- Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh |  | 62 |  |
Financial Transmission Rights - Electricity- Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh |  | 62 |  |
Interest Rate - Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | $ | [3] | $ 300 |  |
Interest Rate - Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | $ | [3] | $ 0 |  |
Foreign Currency Exchange Rate - Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | [3] |  | kr 895 | € 806
Foreign Currency Exchange Rate - Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | [3] |  | 895 | 806
Fixed Price - Natural Gas - Non-current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh | [1] | 20 |  |
Fixed Price - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh | [1] | 20 |  |
Basis - Natural Gas - Non-current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | Bcf | [2] | 369 |  |
Basis - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | Bcf | [2] | 369 |  |
Fixed Price - Electricity - Non-current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | Bcf |  | 41 |  |
Fixed Price - Electricity - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | Bcf |  | 11 |  |
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] | $ 10,121 |  |
Interest Rate - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | $ | [3] | $ 2,750 |  |
Foreign Currency Exchange Rate - Non-current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | [3] |  | 3,278 | 1,557
Foreign Currency Exchange Rate - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | [3] |  | kr 3,278 | € 1,557
[1] | Includes options at Dominion Energy.
[2] | Includes options.
[3] | Maturity is determined based on final settlement period.

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