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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, 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 (8)
Virginia Electric and Power Company  
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax (10)
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 (18)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax (4)
Commodity | Gas  
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax (3)
Commodities, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (2)
Maximum Term 31 months
Commodity | Electricity  
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 20 months
Interest rate  
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax $ (262)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (10)
Maximum Term 381 months
Interest rate | Virginia Electric and Power Company  
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax $ (10)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (1)
Maximum Term 381 months
Interest rate | Dominion Energy Gas Holdings, LLC  
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax $ (29)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (3)
Maximum Term 321 months
Foreign currency  
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax $ 11
Foreign currency, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (1)
Maximum Term 99 months
Foreign currency | Dominion Energy Gas Holdings, LLC  
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax $ 11
Foreign currency, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (1)
Maximum Term 99 months