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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Detail) - USD ($) $ in Millions	Dec. 31, 2019		Dec. 31, 2018
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	$ 735	[1]	$ 278
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	53		83
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral	35		47
Net Amounts	647		148
Virginia Electric and Power Company
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	422		94
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	18		6
Net Amounts	404		88
Dominion Energy Gas Holdings, LLC
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	86		19
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	8		2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral	0		0
Net Amounts	78		17
Commodity | Over-the-counter
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	105	[1]	19
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	21		12
Net Amounts	84		7
Commodity | Exchange
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	21	[1]	115
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	21		68
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral			47
Net Amounts			0
Commodity | Virginia Electric and Power Company | Over-the-counter
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	59		6
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	18		6
Net Amounts	41
Interest rate | Over-the-counter
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	606	[1]	142
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	8		1
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral	35
Net Amounts	563		141
Interest rate | Virginia Electric and Power Company | Over-the-counter
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	363		88
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	0		0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral	0		0
Net Amounts	363		88
Interest rate | Dominion Energy Gas Holdings, LLC | Over-the-counter
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	83		17
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	5		0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral	0		0
Net Amounts	78		17
Foreign currency | Over-the-counter
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	3	[1]	2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	3		2
Foreign currency | Dominion Energy Gas Holdings, LLC | Over-the-counter
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	3		2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	3		2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral	0		0
Net Amounts	$ 0		$ 0
[1] Excludes $5 million and $1 million of derivative liabilities at December 31, 2019 and 2018, respectively, which are not subject to master netting or similar arrangements.

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