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Derivatives and Hedge Accounting Activities (Volume of Derivative Activity) (Detail) - 6 months ended Jun. 30, 2025 | USD ($) MWh Bcf | DKK (kr) | EUR (€)
--- | --- | --- | ---
Fixed Price - Natural Gas - Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity |  | 35 |  |
Fixed Price - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity |  | 32 |  |
Basis - Natural Gas - Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | [1] | 181 |  |
Basis - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | [1] | 145 |  |
Fixed Price - Electricity - Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh |  | 14 |  |
Fixed Price - Electricity - Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh |  | 4 |  |
Financial Transmission Rights - Electricity- Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh |  | 90 |  |
Financial Transmission Rights - Electricity- Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh |  | 90 |  |
Interest Rate - Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | $ | [2] | $ 473,000,000 |  |
Interest Rate - Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | $ | [2] | $ 190,000,000 |  |
Foreign Currency Exchange Rate - Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | [2] |  | kr 1,690,000,000 | € 683,000,000
Foreign Currency Exchange Rate - Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | [2] |  | 1,690,000,000 | 683,000,000
Fixed Price - Natural Gas - Non-current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity |  | 17 |  |
Fixed Price - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity |  | 17 |  |
Basis - Natural Gas - Non-current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | [1] | 322 |  |
Basis - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | [1] | 296 |  |
Fixed Price - Electricity - Non-current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh |  | 32 |  |
Interest Rate - Non-current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | $ | [2] | $ 9,649,000,000 |  |
Interest Rate - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | $ | [2] | $ 5,285,000,000 |  |
Foreign Currency Exchange Rate - Non-current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | [2] |  | 292,000,000 | 128,000,000
Foreign Currency Exchange Rate - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | [2] |  | kr 292,000,000 | € 128,000,000
[1] | Includes options.
[2] | Maturity is determined based on final settlement period.

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