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Related-Party Transactions (Narrative) (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Related Party Transaction [Line Items]          
Derivative Asset $ 250,000,000   $ 250,000,000   $ 307,000,000
Derivative Liabilities 118,000,000   118,000,000   284,000,000
Virginia Electric and Power Company          
Related Party Transaction [Line Items]          
Derivative Asset 147,000,000 [1]   147,000,000 [1]   166,000,000
Derivative Liabilities 14,000,000   14,000,000   66,000,000
Short term demand note 25,000,000   25,000,000   33,000,000 [2]
Outstanding borrowings, net of repayments, under money pool for non-regulated subsidiaries $ 0   $ 0   0
Issuance of common stock (in shares) 0 0 0 0  
Virginia Electric and Power Company | Maximum          
Related Party Transaction [Line Items]          
Interest charges on borrowings $ 1,000,000 $ 1,000,000 $ 1,000,000 $ 1,000,000  
Virginia Electric and Power Company | Pension Benefits | Amounts Associated with the Dominion Pension Plan          
Related Party Transaction [Line Items]          
Amounts due to Dominion, noncurrent 569,000,000   569,000,000   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 236,000,000   236,000,000   199,000,000
Virginia Electric and Power Company | Affiliated Entity          
Related Party Transaction [Line Items]          
Derivative Asset 9,000,000   9,000,000   11,000,000
Derivative Liabilities 5,000,000   5,000,000   5,000,000
Virginia Electric and Power Company | Principal Owner          
Related Party Transaction [Line Items]          
Short term demand note 25,000,000   25,000,000   33,000,000
Dominion Energy Gas Holdings, LLC          
Related Party Transaction [Line Items]          
Derivative Asset 34,000,000   34,000,000   32,000,000
Derivative Liabilities 16,000,000   16,000,000   8,000,000
Short term demand note 56,000,000   56,000,000   18,000,000 [3]
Dominion Energy Gas Holdings, LLC | Revolving Credit Facility | IRCA          
Related Party Transaction [Line Items]          
Short term demand note 56,000,000   56,000,000   18,000,000
Dominion Energy Gas Holdings, LLC | Dominion Energy          
Related Party Transaction [Line Items]          
Derivative Asset 0   0    
Derivative Liabilities 7,000,000   7,000,000    
Dominion Energy Gas Holdings, LLC | Pension Benefits | Amounts Associated with the Dominion Pension Plan          
Related Party Transaction [Line Items]          
Amounts due from Dominion, noncurrent 753,000,000   753,000,000   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 $ 10,000,000   $ 10,000,000   $ 7,000,000
[1] Noncurrent derivative assets are presented in other deferred charges and other assets in Virginia Power’s Consolidated Balance Sheets.
[2] Virginia Power’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[3] Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.