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Related-Party Transactions (Narrative) (Detail) - USD ($) shares in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Related Party Transaction [Line Items]
Derivative Asset	$ 294,000,000	$ 307,000,000
Derivative Liabilities	279,000,000	284,000,000
Dominion Energy Gas Holdings, LLC
Related Party Transaction [Line Items]
Derivative Asset	29,000,000	32,000,000	[1]
Derivative Liabilities	19,000,000	8,000,000
Short term demand note	218,000,000	18,000,000
Dominion Energy Gas Holdings, LLC | Revolving Credit Facility | IRCA
Related Party Transaction [Line Items]
Short term demand note	$ 218,000,000	$ 18,000,000
Weighted- average interest rate percentage	2.78%	1.60%
Dominion Energy Gas Holdings, LLC | Pension Benefits | Amounts Associated with the Dominion Pension Plan
Related Party Transaction [Line Items]
Amounts due from Dominion, noncurrent	$ 772,000,000	$ 734,000,000
Dominion Energy Gas Holdings, LLC | 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	14,000,000	7,000,000
Virginia Electric and Power Company
Related Party Transaction [Line Items]
Derivative Asset	93,000,000	166,000,000
Derivative Liabilities	103,000,000	66,000,000
Short term demand note	224,000,000	33,000,000
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 | Affiliated Entity
Related Party Transaction [Line Items]
Derivative Asset	$ 26,000,000	$ 11,000,000
Derivative Liabilities	10,000,000	5,000,000
Virginia Electric and Power Company | Principal Owner
Related Party Transaction [Line Items]
Short term demand note	$ 224,000,000	$ 33,000,000
Weighted- average interest rate percentage	2.94%	1.65%
Virginia Electric and Power Company | Pension Benefits | Amounts Associated with the Dominion Pension Plan
Related Party Transaction [Line Items]
Amounts due to Dominion, noncurrent	$ 632,000,000	$ 505,000,000
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	$ 254,000,000	$ 199,000,000
[1] Current derivative liabilities are presented in other current liabilities in Virginia Power's Consolidated Balance Sheets.

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