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Regulatory Assets and Liabilities (Narrative) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Public Utilities, General Disclosures [Line Items]    
Regulatory assets past expenditures not earning return $ 323  
Regulatory assets $ 2,503 $ 2,473 [1]
Period for which expenditures are expected to be recovered 2 years  
PJM transmission rates    
Public Utilities, General Disclosures [Line Items]    
Regulatory assets [2] $ 215 192
Virginia Electric and Power Company    
Public Utilities, General Disclosures [Line Items]    
Regulatory assets past expenditures not earning return 242  
Regulatory assets 838 770 [3]
Virginia Electric and Power Company | PJM transmission rates    
Public Utilities, General Disclosures [Line Items]    
Regulatory assets [2] $ 215 $ 192
[1] Dominion Energy’s Consolidated Balance Sheet at December 31, 2016 has been derived from the audited Consolidated Balance Sheet at that date.
[2] Reflects amounts related to the PJM transmission cost allocation matter. See Note 12 for more information.
[3] Virginia Power’s Consolidated Balance Sheet at December 31, 2016 has been derived from the audited Consolidated Balance Sheet at that date.