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Operating Revenue (Schedule of Operating Revenue) (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers	$ 4,510	$ 3,785	$ 12,313	$ 10,764
Renewable Energy Investment Tax Credits
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers	8	10	23	22
Transition services agreements
Public Utilities General Disclosures [Line Items]
Other revenues	23	17	74	34
Alternative Revenue Programs
Public Utilities General Disclosures [Line Items]
Other revenues	35	24	117	85
Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers	3,279	2,705	8,690	7,590
Virginia Electric and Power Company | Renewable Energy Investment Tax Credits
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers	4	4	10	9
Virginia Electric and Power Company | Alternative Revenue Programs
Public Utilities General Disclosures [Line Items]
Other revenues	$ 35	$ 24	$ 117	$ 85

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