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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.

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
-Paragraph 6A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480682/815-20-25-6A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480237/815-40-50-5

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- Definition

Nominal energy measure used to calculate payments on a derivative instrument.

+ References

No definition available.

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- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 181
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480401/815-10-55-181

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 181
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480401/815-10-55-181

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A

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