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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Detail) - USD ($) $ in Millions		Sep. 30, 2024	Dec. 31, 2023
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	[1]	$ 999	$ 1,207
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		99	250
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received		0	15
Net Amounts		900	942
Virginia Electric and Power Company
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	[1]	188	297
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		25	27
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received		0	0
Net Amounts		163	270
Commodity Contract | Over-the-counter
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	[1]	185	289
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		28	26
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received		0	0
Net Amounts		157	263
Commodity Contract | Over-the-counter | Virginia Electric and Power Company
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	[1]	132	112
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		15	13
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received		0	0
Net Amounts		117	99
Commodity Contract | Exchange
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	[1]	104	118
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		46	33
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received		0	15
Net Amounts		58	70
Commodity Contract | Exchange | Virginia Electric and Power Company
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	[1]	3	4
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		2	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]	702	800
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		17	191
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received		0	0
Net Amounts		685	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]	45	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		45	$ 170
Foreign currency exchange rate | Over-the-counter
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	[1]	8
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		8
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received		0
Net Amounts		0
Foreign currency exchange rate | Over-the-counter | Virginia Electric and Power Company
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	[1]	8
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		8
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received		0
Net Amounts		$ 0
[1] Excludes derivative assets of $161 million and $143 million at Dominion Energy and $11 million and $1 million at Virginia Power at September 30, 2024 and December 31, 2023, respectively, which are not subject to master netting or other similar arrangements.

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