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Derivatives and Hedge Accounting Activities (Volume of Derivative Activity) (Detail) - 9 months ended Sep. 30, 2025 | USD ($) MWh Bcf | DKK (kr) | EUR (€)
--- | --- | --- | ---
Fixed Price - Natural Gas - Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity |  | 43 |  |
Fixed Price - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity |  | 40 |  |
Basis - Natural Gas - Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | [1] | 191 |  |
Basis - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | [1] | 163 |  |
Fixed Price - Electricity - Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh |  | 11 |  |
Fixed Price - Electricity - Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh |  | 2 |  |
Financial Transmission Rights - Electricity- Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh |  | 65 |  |
Financial Transmission Rights - Electricity- Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh |  | 65 |  |
Interest Rate - Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | $ | [2] | $ 350,000,000 |  |
Interest Rate - Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | $ | [2] | $ 350,000,000 |  |
Foreign Currency Exchange Rate - Current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | [2] |  | kr 1,373,000,000 | € 683,000,000
Foreign Currency Exchange Rate - Current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | [2] |  | 1,373,000,000 | 683,000,000
Fixed Price - Natural Gas - Non-current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity |  | 11 |  |
Fixed Price - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity |  | 11 |  |
Basis - Natural Gas - Non-current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | [1] | 310 |  |
Basis - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivative activity | [1] | 291 |  |
Fixed Price - Electricity - Non-current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of electricity | MWh |  | 33 |  |
Interest Rate - Non-current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | $ | [2] | $ 13,596,000,000 |  |
Interest Rate - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | $ | [2] | $ 8,950,000,000 |  |
Foreign Currency Exchange Rate - Non-current Derivative Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | [2] |  | 140,000,000 | 211,000,000
Foreign Currency Exchange Rate - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative payment | [2] |  | kr 140,000,000 | € 211,000,000
[1] | Includes options.
[2] | Maturity is determined based on final settlement period.

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