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Related-Party Transactions (Details) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Related Party Transaction [Line Items]      
Derivative Asset $ 274,000,000   $ 279,000,000
Derivative Liabilities 150,000,000   155,000,000
Capital expenditures 1,435,000,000 $ 1,497,000,000  
Virginia Electric and Power Company      
Related Party Transaction [Line Items]      
Derivative Asset 178,000,000   194,000,000
Derivative Liabilities 33,000,000   31,000,000
Commodity purchases from affiliates 212,000,000 145,000,000  
Services provided by affiliates [1] 112,000,000 140,000,000  
Services provided to affiliates 5,000,000 5,000,000  
Capital expenditures 647,000,000 604,000,000  
Outstanding borrowings, net of repayments, under money pool for non-regulated subsidiaries 0   0
Virginia Electric and Power Company | Affiliate      
Related Party Transaction [Line Items]      
Derivative Asset 27,000,000   41,000,000
Derivative Liabilities 3,000,000   8,000,000
Virginia Electric and Power Company | Affiliate | Services provided by affiliates      
Related Party Transaction [Line Items]      
Capital expenditures 34,000,000 39,000,000  
Virginia Electric and Power Company | Principal Owner      
Related Party Transaction [Line Items]      
Short term demand note 0   262,000,000
Virginia Electric and Power Company | Pension Benefits | Amounts Associated with the Dominion Pension Plan      
Related Party Transaction [Line Items]      
Amounts due to Dominion 423,000,000   396,000,000
Virginia Electric and Power Company | Dominion Retiree Health and Welfare plan | Amounts Associated with the Dominion Retiree Health and Welfare Plan      
Related Party Transaction [Line Items]      
Amounts due to Dominion 149,000,000   130,000,000
Dominion Gas Holdings, LLC      
Related Party Transaction [Line Items]      
Derivative Liabilities 7,000,000   11,000,000
Commodity purchases from affiliates 0 3,000,000  
Services provided by affiliates [2] 39,000,000 27,000,000  
Services provided to affiliates 18,000,000 17,000,000  
Capital expenditures 134,000,000 161,000,000  
Other receivables [3] 11,000,000   10,000,000
Affiliated notes receivable [4] 19,000,000   18,000,000
Dominion Gas Holdings, LLC | Revolving Credit Facility | IRCA      
Related Party Transaction [Line Items]      
Borrowings under IRCA 174,000,000   118,000,000
Dominion Gas Holdings, LLC | Services provided by affiliates      
Related Party Transaction [Line Items]      
Commodity purchases from affiliates [5] 35,000,000 39,000,000  
Dominion Gas Holdings, LLC | Affiliate      
Related Party Transaction [Line Items]      
Imbalances receivable from affiliates [6] 2,000,000   2,000,000
Imbalances payable to affiliates [7] 0   4,000,000
Dominion Gas Holdings, LLC | Affiliate | Services provided by affiliates      
Related Party Transaction [Line Items]      
Capital expenditures 8,000,000 $ 12,000,000  
Dominion Gas Holdings, LLC | Pension Benefits | Amounts Associated with the Dominion Pension Plan      
Related Party Transaction [Line Items]      
Amounts due from Dominion, noncurrent 706,000,000   697,000,000
Dominion Gas Holdings, LLC | Dominion Retiree Health and Welfare plan | Amounts Associated with the Dominion Retiree Health and Welfare Plan      
Related Party Transaction [Line Items]      
Amounts due from Dominion, noncurrent $ 3,000,000   $ 2,000,000
[1] Includes capitalized expenditures of $34 million and $39 million for the three months ended March 31, 2017 and 2016, respectively.
[2] Amounts primarily attributable to Atlantic Coast Pipeline.
[3] Represents amounts due from Atlantic Coast Pipeline, a related-party VIE.
[4] Amounts are presented in other deferred charges and other assets in Dominion Gas' Consolidated Balance Sheets.
[5] Includes capitalized expenditures of $8 million and $12 million for the three months ended March 31, 2017 and 2016, respectively.
[6] Amounts are presented in other current assets in Dominion Gas' Consolidated Balance Sheets.
[7] Amounts are presented in other current liabilities in Dominion Gas' Consolidated Balance Sheets.