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Operating Revenue (Schedule of Operating Revenue) (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers	$ 3,685	$ 3,794	$ 8,441	$ 8,341
NGL Midstream | Transferred at a Point in Time
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers	8	14	16	25
Renewable Energy Investment Tax Credits
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers	24	7	29	11
Alternative Revenue Programs
Public Utilities General Disclosures [Line Items]
Other revenues	57	40	114	70
Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers	2,189	2,239	4,535	4,435
Virginia Electric and Power Company | Alternative Revenue Programs
Public Utilities General Disclosures [Line Items]
Other revenues	50	19	77	27
Virginia Electric and Power Company | Maximum | Renewable Energy Investment Tax Credits
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers	$ 19	$ 1	$ 22	$ 1

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