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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities $ 116 $ 153
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet 116 153
Total derivatives, not subject to a master netting or similar arrangement 2 2
Gross Amounts of Recognized Liabilities, Total 118 155
Derivative Liabilities 118 [1] 155 [2]
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 39 67
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral 0 27
Net Amounts 77 59
Virginia Electric and Power Company    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities 56 23
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet 56 23
Total derivatives, not subject to a master netting or similar arrangement 5 8
Gross Amounts of Recognized Liabilities, Total 61 31
Derivative Liabilities [2] 61 31
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 1 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral 0 0
Net Amounts 55 21
Dominion Energy Gas Holdings, LLC    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities 10 11
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet 10 11
Derivative Liabilities 10 11
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 4 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral 0 0
Net Amounts 6 11
Commodity | Over-the-counter    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities 19 23
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet 19 23
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 8 14
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral 0 0
Net Amounts 11 9
Commodity | Over-the-counter | Virginia Electric and Power Company    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities 1 2
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet 1 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 1 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral 0 0
Net Amounts 0 0
Commodity | Over-the-counter | Dominion Energy Gas Holdings, LLC    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities 6 5
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet 6 5
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 6 5
Commodity | Exchange    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities 21 71
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet 21 71
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 21 44
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral 0 27
Net Amounts 0 0
Interest rate | Over-the-counter    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities 72 53
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet 72 53
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 6 9
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral 0 0
Net Amounts 66 44
Interest rate | Over-the-counter | Virginia Electric and Power Company    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities 55 21
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet 55 21
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 55 21
Foreign currency | Over-the-counter    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities 4 6
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet 4 6
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 4 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral 0 0
Net Amounts 0 6
Foreign currency | Over-the-counter | Dominion Energy Gas Holdings, LLC    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities 4 6
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet 4 6
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 4 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral 0 0
Net Amounts $ 0 $ 6
[1] Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy’s Consolidated Balance Sheets.
[2] Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Virginia Power’s Consolidated Balance Sheets.