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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
6 Months Ended
Jun. 30, 2017
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax $ (250)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax 3
Interest rate  
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax (269)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (11)
Maximum Term 390 months
Foreign currency  
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax $ 2
Maximum Term 108 months
Foreign currency, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (3)
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)
Virginia Electric and Power Company | Interest rate  
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 390 months
Dominion Energy Gas Holdings, LLC  
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax $ (23)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax (5)
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 330 months
Dominion Energy Gas Holdings, LLC | NGLs  
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax $ 1
Maximum Term 9 months
Commodities, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ 1
Dominion Energy Gas Holdings, LLC | Foreign currency  
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax $ 2
Maximum Term 108 months
Foreign currency, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (3)