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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [1] $ 287 $ 303
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 83 99
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 204 204
Virginia Electric and Power Company    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [2] 67 155
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 6 4
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 61 151
Commodity | Over-the-counter    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [1] 175 174
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 12 9
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 163 165
Commodity | Exchange    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [1] 68 80
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 68 80
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Commodity | Virginia Electric and Power Company | Over-the-counter    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [2] 64 155
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 6 4
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 58 151
Commodity | Dominion Energy Gas Holdings, LLC | Over-the-counter    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet 3  
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 3  
Interest rate | Over-the-counter    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [1] 18 17
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 1 8
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 17 9
Interest rate | Virginia Electric and Power Company | Over-the-counter    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [2] 3  
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 3  
Interest rate | Dominion Energy Gas Holdings, LLC | Over-the-counter    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet 2 1
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 0 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 2 1
Foreign currency | Over-the-counter    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [1] 26 32
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 2 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 24 30
Foreign currency | Dominion Energy Gas Holdings, LLC | Over-the-counter    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet 26 32
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 2 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts $ 24 $ 30
[1] Excludes $7 million and $4 million of derivative assets at December 31, 2018 and 2017, respectively, which are not subject to master netting or similar arrangements.
[2] Excludes $26 million and $11 million of derivative assets at December 31, 2018 and 2017, respectively, which are not subject to master netting or similar arrangements.