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Derivatives and Hedge Accounting Activities (Selected Information Related to Gains (Losses) on Cash Flow Hedges Included in AOCI) (Detail)
$ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (248)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax (26)
Virginia Electric and Power Company  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax (8)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax (1)
Dominion Energy Gas Holdings, LLC  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax (24)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax (13)
Commodity contracts | Gas  
Derivative Instruments Gain Loss [Line Items]  
Commodities, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ 1
Maximum Term 37 months
Commodity contracts | Electricity  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (9)
Commodities, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (9)
Maximum Term 18 months
Commodity contracts | Other Energy Contract  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (5)
Commodities, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (5)
Maximum Term 9 months
Interest rate  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (246)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (9)
Maximum Term 378 months
Interest rate | Virginia Electric and Power Company  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (8)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (1)
Maximum Term 378 months
Interest rate | Dominion Energy Gas Holdings, LLC  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (31)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (4)
Maximum Term 318 months
Foreign currency  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ 12
Foreign currency, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (4)
Maximum Term 96 months
Foreign currency | Dominion Energy Gas Holdings, LLC  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ 12
Foreign currency, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (4)
Maximum Term 96 months
NGLs | Dominion Energy Gas Holdings, LLC  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (5)
Commodities, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (5)
Maximum Term 9 months