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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
9 Months Ended
Sep. 30, 2018
USD ($)
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (245)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax (71)
Virginia Electric and Power Company  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax (5)
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 (16)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax (14)
Commodity contracts | Gas  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax 2
Commodities, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ 2
Maximum Term 37 months
Commodity contracts | Electricity  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (34)
Commodities, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (34)
Maximum Term 15 months
Commodity contracts | Other Energy Contract  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (7)
Commodities, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (7)
Maximum Term 6 months
Interest rate  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (219)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (29)
Maximum Term 375 months
Interest rate | Virginia Electric and Power Company  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (5)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (1)
Maximum Term 375 months
Interest rate | Dominion Energy Gas Holdings, LLC  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (22)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (4)
Maximum Term 315 months
Foreign currency  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ 13
Foreign currency, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (3)
Maximum Term 93 months
Foreign currency | Dominion Energy Gas Holdings, LLC  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ 13
Foreign currency, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (3)
Maximum Term 93 months
NGLs | Dominion Energy Gas Holdings, LLC  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (7)
Commodities, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (7)
Maximum Term 6 months