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Derivatives and Hedge Accounting Activities (Volume of Derivative Activity) (Detail) - 6 months ended Jun. 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 derivative activity | Bcf | [1] | 43 |  |
Fixed Price - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | Bcf | [1] | 40 |  |
Basis - Natural Gas - Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | Bcf | [2] | 157 |  |
Basis - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | Bcf | [2] | 138 |  |
Fixed Price - Electricity - Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh |  | 17 |  |
Fixed Price - Electricity - Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh |  | 8 |  |
Oil - Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | $ |  | $ 6 |  |
Oil - Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | $ |  | 6 |  |
Interest Rate - Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | $ | [3] | 524 |  |
Interest Rate - Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | $ | [3] | $ 125 |  |
Foreign Currency Exchange Rate - Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | [3] |  | kr 1,004 | € 453
Foreign Currency Exchange Rate - Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | [3] |  | 1,004 | 453
Fixed Price - Natural Gas - Non-current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | Bcf | [1] | 14 |  |
Fixed Price - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | Bcf | [1] | 14 |  |
Basis - Natural Gas - Non-current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | Bcf | [2] | 375 |  |
Basis - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | Bcf | [2] | 372 |  |
Fixed Price - Electricity - Non-current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh |  | 44 |  |
Fixed Price - Electricity - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh |  | 13 |  |
Oil - Non-current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | $ |  | $ 0 |  |
Oil - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | $ |  | 0 |  |
Interest Rate - Non-current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | $ | [3] | 11,758 |  |
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] |  | 3,468 | 2,131
Foreign Currency Exchange Rate - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | [3] |  | kr 3,468 | € 2,131
[1] | Includes options at Dominion Energy.
[2] | Includes options.
[3] | Maturity is determined based on final settlement period.

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