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Operating Revenue (Schedule of Operating Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Electric sales:    
Regulated $ 1,766 $ 1,842
Nonregulated 427 389
Gas sales:    
Regulated 448 65
Nonregulated 144 118
Gas transportation and storage 492 415
Other 107 92
Total operating revenue 3,384 2,921
Virginia Electric and Power Company    
Electric sales:    
Regulated 1,766 1,842
Gas sales:    
Other 65 48
Total operating revenue [1] 1,831 1,890
Dominion Gas Holdings, LLC    
Gas sales:    
Regulated 32 29
Nonregulated 2 1
Gas transportation and storage 396 351
Other 60 50
Total operating revenue [2] $ 490 $ 431
[1] See Note 17 for amounts attributable to affiliates.
[2] See Note 17 for amounts attributable to related parties.