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

3 Months Ended

9 Months Ended

Sep. 30, 2025

Sep. 30, 2024

Sep. 30, 2025

Sep. 30, 2024

Related Party Transaction [Line Items]

Services provided to affiliates

$ 4,527

$ 3,941

$ 12,413

$ 11,059

Virginia Electric and Power Company

Related Party Transaction [Line Items]

Commodity purchases from affiliates

221

147

734

453

Services provided to affiliates

^[1]

3,311

2,762

8,788

7,788

Virginia Electric and Power Company | Related Party

Related Party Transaction [Line Items]

Services provided by affiliates

^[2],[3]

203

169

608

495

Services provided to affiliates

$ 4

$ 4

$ 11

$ 12

[1]	See Note 19 for amounts attributable to affiliates.
[2]	Excludes amounts related to Virginia Power's operating lease with an affiliated entity as discussed in Note 14.
[3]	Includes capitalized expenditures of $76 million and $59 million for the three months ended September 30, 2025 and 2024, respectively, and $222 million and $170 million for the nine months ended September 30, 2025 and 2024, respectively.

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