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Operating Revenue (Schedule of Operating Revenue For Revised Guidance of Revenue Recognition From Contracts with Customers ) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Gas sales:    
Total operating revenue [1] $ 3,466 $ 3,384
Virginia Electric and Power Company    
Gas sales:    
Total operating revenue [2] 1,748 1,831
Dominion Energy Gas Holdings, LLC    
Gas sales:    
Total operating revenue [3] $ 526 490
Prior to adoption of revised guidance    
Electric sales:    
Regulated   1,766
Nonregulated   427
Gas sales:    
Regulated   448
Nonregulated   144
Gas transportation and storage   492
Other revenues   107
Total operating revenue   3,384
Prior to adoption of revised guidance | Virginia Electric and Power Company    
Electric sales:    
Regulated   1,766
Gas sales:    
Other revenues   65
Total operating revenue   1,831
Prior to adoption of revised guidance | Dominion Energy Gas Holdings, LLC    
Gas sales:    
Regulated   32
Nonregulated   2
Gas transportation and storage   396
Other revenues   60
Total operating revenue   $ 490
[1] See Note 10 for amounts attributable to related parties.
[2] See Note 18 for amounts attributable to affiliates.
[3] See Note 18 for amounts attributable to related parties.