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Related-Party Transactions (Narrative) (Detail) - USD ($)
shares in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Related Party Transaction [Line Items]          
Derivative Asset $ 209,000,000   $ 209,000,000   $ 294,000,000
Derivative Liabilities 626,000,000   626,000,000   279,000,000
Virginia Electric and Power Company          
Related Party Transaction [Line Items]          
Derivative Asset 83,000,000   83,000,000   93,000,000
Derivative Liabilities 358,000,000   358,000,000   103,000,000
Short term demand note 71,000,000   71,000,000   224,000,000 [1]
Outstanding borrowings, net of repayments, under money pool for non-regulated subsidiaries $ 0   $ 0   0
Issuance of common stock to Dominion 0 0 0 0  
Virginia Electric and Power Company | Pension Benefits | Amounts Associated with the Dominion Pension Plan          
Related Party Transaction [Line Items]          
Amounts due to Dominion, noncurrent $ 717,000,000   $ 717,000,000   632,000,000
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 259,000,000   259,000,000   254,000,000
Virginia Electric and Power Company | Affiliated Entity          
Related Party Transaction [Line Items]          
Derivative Asset 2,000,000   2,000,000   26,000,000
Derivative Liabilities 23,000,000   23,000,000   10,000,000
Virginia Electric and Power Company | Principal Owner          
Related Party Transaction [Line Items]          
Short term demand note 71,000,000   71,000,000   224,000,000
Dominion Energy Gas Holdings, LLC          
Related Party Transaction [Line Items]          
Derivative Asset 16,000,000   16,000,000   29,000,000
Derivative Liabilities 77,000,000   77,000,000   19,000,000
Short term demand note 150,000,000   150,000,000   218,000,000 [2]
Dominion Energy Gas Holdings, LLC | Revolving Credit Facility | IRCA          
Related Party Transaction [Line Items]          
Short term demand note 150,000,000   150,000,000   218,000,000
Dominion Energy Gas Holdings, LLC | Pension Benefits | Amounts Associated with the Dominion Pension Plan          
Related Party Transaction [Line Items]          
Amounts due from Dominion, noncurrent 783,000,000   783,000,000   772,000,000
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   $ 14,000,000   $ 14,000,000
[1] Virginia Power’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[2] Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.