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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, 2019
USD ($)
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (502)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax (47)
Virginia Electric and Power Company  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax (46)
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 (101)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax (8)
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 6 months
Commodity | Natural Gas  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (6)
Commodities, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (5)
Maximum Term 27 months
Commodity | 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 $ 8
Maximum Term 15 months
Interest rate  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (512)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (49)
Maximum Term 387 months
Interest rate | Virginia Electric and Power Company  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (46)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (1)
Maximum Term 387 months
Interest rate | Dominion Energy Gas Holdings, LLC  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (108)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (7)
Maximum Term 303 months
Foreign currency  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ 5
Foreign currency, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (3)
Maximum Term 81 months
Foreign currency | Dominion Energy Gas Holdings, LLC  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ 5
Foreign currency, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (3)
Maximum Term 81 months
NGLs | Dominion Energy Gas Holdings, LLC  
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 6 months