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Related-Party Transactions (Detail) - Virginia Electric and Power Company - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Related Party Transaction [Line Items]
Commodity purchases from affiliates		$ 103	$ 291	$ 317	$ 584
Services provided by affiliates	[1]	145	123	292	253
Affiliated Entity
Related Party Transaction [Line Items]
Services provided to affiliates		$ 4	$ 5	$ 8	$ 9
[1] Includes capitalized expenditures of $46 million and $39 million for the three months ended June 30, 2023 and 2022, respectively, and $100 million and $78 million for the six months ended June 30, 2023 and 2022, respectively.

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