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Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2015
Accounting Policy [Line Items]          
Accrued unbilled revenue   $ 631 $ 462    
Percentage of fuel currently subject to deferred fuel accounting   84.00%      
Accounts payable for checks outstanding   $ 24 27    
Margin deposit assets   82 16    
Capitalized interest costs and AFUDC   159 100 $ 80  
Virginia Electric and Power Company          
Accounting Policy [Line Items]          
Accrued unbilled revenue   349 333    
Refund received of income tax payments $ 300        
Accounts payable for checks outstanding   11 11    
Capitalized interest costs   21 30 39  
AFUDC related to projects   31 19 8  
Dominion Gas Holdings, LLC          
Accounting Policy [Line Items]          
Accrued unbilled revenue   134 98    
Refund received of income tax payments $ 92        
Accounts payable for checks outstanding   9 7    
Capitalized interest costs   8 1 $ 1  
Inventory under LIFO method   13 24    
Amount exceeded on LIFO basis   55 109    
Federal | Virginia Electric and Power Company          
Accounting Policy [Line Items]          
Affiliated payables for estimated income taxes owed     9    
Noncurrent income tax payable   2      
Federal | Dominion Gas Holdings, LLC          
Accounting Policy [Line Items]          
Noncurrent income tax payable   1      
State | Virginia Electric and Power Company          
Accounting Policy [Line Items]          
Income tax receivable   6 10    
Affiliated payables for estimated income taxes owed     1    
Noncurrent income tax payable     2    
Noncurrent income taxes receivable   13 14    
State | Dominion Gas Holdings, LLC          
Accounting Policy [Line Items]          
Income tax receivable   1 4    
Affiliated payables for estimated income taxes owed     1    
Noncurrent income tax payable   7 22    
Affiliated Entity | Virginia Electric and Power Company          
Accounting Policy [Line Items]          
Income tax receivable   112      
Affiliated Entity | Dominion Gas Holdings, LLC          
Accounting Policy [Line Items]          
Income tax receivable   11 91    
Affiliated Entity | Federal | Virginia Electric and Power Company          
Accounting Policy [Line Items]          
Income tax receivable   122 $ 296    
Affiliated Entity | Federal | Dominion Gas Holdings, LLC          
Accounting Policy [Line Items]          
Income tax receivable   10      
Affiliated Entity | State | Virginia Electric and Power Company          
Accounting Policy [Line Items]          
Affiliated payables for estimated income taxes owed   10      
Affiliated Entity | State | Dominion Gas Holdings, LLC          
Accounting Policy [Line Items]          
Income tax receivable   $ 1      
Merchant Solar Projects | Disposal Group, Disposed of by Sale, Not Discontinued Operations          
Accounting Policy [Line Items]          
SunEdison's ownership percentage interest in merchant solar projects   33.00%     33.00%