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Related-Party Transactions (Detail) - USD ($)
$ in Millions

3 Months Ended

12 Months Ended

Dec. 31, 2024

Sep. 30, 2024

Jun. 30, 2024

Mar. 31, 2024

Dec. 31, 2023

Sep. 30, 2023

Jun. 30, 2023

Mar. 31, 2023

Dec. 31, 2024

Dec. 31, 2023

Dec. 31, 2022

Related Party Transaction [Line Items]

Services provided to affiliates

$ 3,400

$ 3,941

$ 3,486

$ 3,632

$ 3,534

$ 3,810

$ 3,166

$ 3,883

$ 14,459

$ 14,393

$ 13,938

Virginia Electric and Power Company

Related Party Transaction [Line Items]

Commodity purchases from affiliates

585

582

1,423

Services provided to affiliates

^[1]

10,235

9,573

9,654

Virginia Electric and Power Company | Related Party

Related Party Transaction [Line Items]

Services provided by affiliates

^[2]

667

605

519

Services provided to affiliates

$ 22

$ 20

$ 18

[1]	See Note 25 for amounts attributable to affiliates.
[2]	Includes capitalized expenditures of $234 million, $210 million and $177 million for the years ended December 31, 2024, 2023 and 2022, respectively.

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