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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets $ 242 $ 303
Net Amounts of Assets Presented in the Consolidated Balance Sheet 242 303
Total derivatives, not subject to a master netting or similar arrangement 8 4
Gross Amounts of Recognized Assets, Total 250 307
Derivative Asset 250 307
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 42 99
Net Amounts 200 204
Virginia Electric and Power Company    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 138 155
Net Amounts of Assets Presented in the Consolidated Balance Sheet 138 155
Total derivatives, not subject to a master netting or similar arrangement 9 11
Gross Amounts of Recognized Assets, Total 147 166
Derivative Asset 147 [1] 166
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 6 4
Net Amounts 132 151
Dominion Energy Gas Holdings, LLC    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 34 32
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Assets Presented in the Consolidated Balance Sheet 34 32
Derivative Asset 34 32
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 6 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 28 30
Commodity contracts | Over-the-counter    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 130 174
Net Amounts of Assets Presented in the Consolidated Balance Sheet 130 174
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 7 9
Net Amounts 123 165
Commodity contracts | Exchange    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 21 80
Net Amounts of Assets Presented in the Consolidated Balance Sheet 21 80
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 21 80
Commodity contracts | Virginia Electric and Power Company | Over-the-counter    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 117 155
Net Amounts of Assets Presented in the Consolidated Balance Sheet 117 155
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 3 4
Net Amounts 114 151
Interest rate | Over-the-counter    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 58 17
Net Amounts of Assets Presented in the Consolidated Balance Sheet 58 17
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 9 8
Net Amounts 49 9
Interest rate | Virginia Electric and Power Company | Over-the-counter    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 21  
Net Amounts of Assets Presented in the Consolidated Balance Sheet 21  
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 3  
Net Amounts 18  
Interest rate | Dominion Energy Gas Holdings, LLC | Over-the-counter    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 1 0
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Assets Presented in the Consolidated Balance Sheet 1 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 1 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 0 0
Foreign currency | Over-the-counter    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 33 32
Net Amounts of Assets Presented in the Consolidated Balance Sheet 33 32
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 5 2
Net Amounts 28 30
Foreign currency | Dominion Energy Gas Holdings, LLC | Over-the-counter    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 33 32
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Assets Presented in the Consolidated Balance Sheet 33 32
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 5 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts $ 28 $ 30
[1] Noncurrent derivative assets are presented in other deferred charges and other assets in Virginia Power’s Consolidated Balance Sheets.