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Related-Party Transactions (Detail) - Virginia Electric and Power Company - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Related Party Transaction [Line Items]
Commodity purchases from affiliates		$ 291	$ 126	$ 584	$ 307
Services provided by affiliates	[1]	123	122	253	247
Affiliated Entity
Related Party Transaction [Line Items]
Services provided to affiliates		$ 5	$ 4	$ 9	$ 9
[1] Includes capitalized expenditures of $39 million and $44 million for the three months ended June 30, 2022 and 2021, respectively, and $78 million and $82 million for the six months ended June 30, 2022 and 2021, respectively.

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