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Variable Interest Entities (Narrative) (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2017
USD ($)
MW
generator
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Variable Interest Entities [Line Items]      
Securities due within one year $ 2,391   $ 1,709 [1]
Long term debt 31,096   30,231 [1]
Virginia Electric and Power Company      
Variable Interest Entities [Line Items]      
Securities due within one year 928   678 [2]
Long term debt 10,348   9,852 [2]
Dominion Gas Holdings, LLC      
Variable Interest Entities [Line Items]      
Long term debt 3,533   $ 3,528 [3]
Variable Interest Entity, Primary Beneficiary | SBL Holdco      
Variable Interest Entities [Line Items]      
Securities due within one year 30    
Long term debt $ 365    
Variable Interest Entity (VIE) or Potential VIE, Information Unavailability | Virginia Electric and Power Company      
Variable Interest Entities [Line Items]      
Long term capacity contract non utility generators (generators) | generator 3    
Aggregate generation capacity from long-term power and capacity contracts (MW) | MW 418    
Remaining purchase commitments $ 258    
Payment for electric capacity 28 $ 37  
Payment for electric energy 8 7  
Variable Interest Entity, Not Primary Beneficiary | Virginia Electric and Power Company | DRS      
Variable Interest Entities [Line Items]      
Shared services purchased 85 114  
Variable Interest Entity, Not Primary Beneficiary | Dominion Gas Holdings, LLC | DRS      
Variable Interest Entities [Line Items]      
Shared services purchased $ 31 $ 35  
[1] Dominion’s Consolidated Balance Sheet at December 31, 2016 has been derived from the audited Consolidated Balance Sheet at that date.
[2] Virginia Power’s Consolidated Balance Sheet at December 31, 2016 has been derived from the audited Consolidated Balance Sheet at that date.
[3] Dominion Gas’ Consolidated Balance Sheet at December 31, 2016 has been derived from the audited Consolidated Balance Sheet at that date.