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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
12 Months Ended
Dec. 31, 2018
USD ($)
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (235)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax (2)
Commodity | Electricity  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax 27
Commodities, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ 26
Maximum Term 24 months
Commodity | Other Energy Contract  
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 3 months
Commodity | Natural Gas  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ 0
Commodities, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ 1
Maximum Term 36 months
Interest rate  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (276)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (29)
Maximum Term 396 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 $ (2)
Maximum Term 90 months
Dominion Energy Gas Holdings, LLC  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (25)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax (4)
Dominion Energy Gas Holdings, LLC | Interest rate  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax (39)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (4)
Maximum Term 312 months
Dominion Energy Gas Holdings, LLC | 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 $ (2)
Maximum Term 90 months
Dominion Energy Gas Holdings, LLC | NGLs  
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 3 months
Virginia Electric and Power Company  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (13)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax (1)
Virginia Electric and Power Company | Interest rate  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax (13)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (1)
Maximum Term 384 months