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Related-Party Transactions (Narrative) (Detail) - USD ($)	1 Months Ended				12 Months Ended
	Aug. 31, 2021	Jul. 31, 2021	Sep. 30, 2020	Aug. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Derivative asset					$ 613,000,000	$ 397,000,000
Derivative liabilities					868,000,000	486,000,000
Issuance of common stock (in shares)	600,000	1,400,000	4,100,000	18,500,000			6,100,000
Virginia Electric and Power Company
Related Party Transaction [Line Items]
Derivative asset					300,000,000	181,000,000
Derivative liabilities					470,000,000	405,000,000
Payable to affiliates					699,000,000	380,000,000
Outstanding borrowings, net of repayments, under money pool for non-regulated subsidiaries					$ 0	$ 0
Issuance of common stock (in shares)					0	0	0
Virginia Electric and Power Company | Pension Benefits | Amounts Associated With Dominion Pension Plan
Related Party Transaction [Line Items]
Amounts due to Dominion, noncurrent					$ 522,000,000	$ 436,000,000
Virginia Electric and Power Company | Medical Coverage for Local retirees | Amounts Associated with the Dominion Retiree Health and Welfare Plan
Related Party Transaction [Line Items]
Amounts due from Dominion, noncurrent					431,000,000	354,000,000
Virginia Electric and Power Company | Affiliated Entity
Related Party Transaction [Line Items]
Derivative asset					29,000,000	3,000,000
Derivative liabilities					6,000,000	22,000,000
Virginia Electric and Power Company | Principal Owner | Short-Term Borrowing Arrangements
Related Party Transaction [Line Items]
Payable to affiliates					$ 699,000,000	$ 380,000,000
Weighted- average interest rate percentage					0.26%	0.30%

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