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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
3 Months Ended
Mar. 31, 2019
USD ($)
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (290)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax (7)
Virginia Electric and Power Company  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax (20)
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 (48)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax (6)
Commodity | Natural 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 $ 1
Maximum Term 43 months
Commodity | Electricity  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ 33
Commodities, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ 24
Maximum Term 21 months
Interest rate  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (333)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (31)
Maximum Term 393 months
Interest rate | Virginia Electric and Power Company  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (20)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (1)
Maximum Term 393 months
Interest rate | Dominion Energy Gas Holdings, LLC  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (56)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (5)
Maximum Term 309 months
Foreign currency  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ 8
Foreign currency, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (1)
Maximum Term 87 months
Foreign currency | Dominion Energy Gas Holdings, LLC  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ 8
Foreign currency, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (1)
Maximum Term 87 months