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Derivatives and Hedge Accounting Activities (Selected Information Related to Gains (Losses) on Cash Flow Hedges Included in AOCI) (Details)
$ in Millions
9 Months Ended
Sep. 30, 2017
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax $ (254)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax (11)
Interest rate  
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax (260)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (11)
Maximum Term 387 months
Foreign currency  
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax $ 4
Maximum Term 105 months
Foreign currency, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (2)
Virginia Electric and Power Company  
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax (12)
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 (12)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (1)
Maximum Term 387 months
Dominion Energy Gas Holdings, LLC  
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax $ (26)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax (9)
Dominion Energy Gas Holdings, LLC | Interest rate  
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax (26)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (3)
Maximum Term 327 months
Dominion Energy Gas Holdings, LLC | NGLs  
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax $ (4)
Maximum Term 6 months
Commodities, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (4)
Dominion Energy Gas Holdings, LLC | Foreign currency  
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax $ 4
Maximum Term 105 months
Foreign currency, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (2)