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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Detail) - USD ($) $ in Millions		Dec. 31, 2024	Dec. 31, 2023
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	[1]	$ 1,157	$ 1,207
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		301	250
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received		0	15
Net Amounts		856	942
Virginia Electric and Power Company
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	[1]	357	297
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		45	27
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received		0	0
Net Amounts		312	270
Commodity Contract | Over-the-counter
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	[1]	197	289
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		20	26
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received		0	0
Net Amounts		177	263
Commodity Contract | Over-the-counter | Virginia Electric and Power Company
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	[1]	95	112
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		14	13
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received		0	0
Net Amounts		81	99
Commodity Contract | Exchange
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	[1]	55	118
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		54	33
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received		0	15
Net Amounts		1	70
Commodity Contract | Exchange | Virginia Electric and Power Company
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	[1]	2	4
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		1	3
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received		0	0
Net Amounts		1	1
Interest Rate Contract | Over-the-counter
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	[1]	875	800
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		197	191
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received		0	0
Net Amounts		678	609
Interest Rate Contract | Over-the-counter | Virginia Electric and Power Company
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	[1]	230	181
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		0	11
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received		0	0
Net Amounts		230	$ 170
Foreign Currency Exchange Rate Contract | Over-the-counter
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	[1]	30
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		30
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received		0
Net Amounts		0
Foreign Currency Exchange Rate Contract | Over-the-counter | Virginia Electric and Power Company
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	[1]	30
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		30
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received		0
Net Amounts		$ 0
[1] Excludes derivative assets of $242 million and $143 million at Dominion Energy, and $18 million and $1 million at Virginia Power, at December 31, 2024 and 2023, respectively, which are not subject to master netting or similar arrangements.

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