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Investments (Investments Under Equity Method of Accounting) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]    
Investment Balance $ 1,561 $ 1,320
Blue Racer    
Schedule of Equity Method Investments [Line Items]    
Ownership% 50.00%  
Investment Balance $ 677 661
Description Midstream gas and related services  
Atlantic Coast Pipeline    
Schedule of Equity Method Investments [Line Items]    
Ownership% 48.00%  
Investment Balance $ 256 59
Description Gas transmission system  
Iroquois    
Schedule of Equity Method Investments [Line Items]    
Ownership% [1] 50.00%  
Investment Balance $ 316 324
Description Gas transmission system  
Fowler Ridge    
Schedule of Equity Method Investments [Line Items]    
Ownership% 50.00%  
Investment Balance $ 116 125
Description Wind-powered merchant generation facility  
NedPower    
Schedule of Equity Method Investments [Line Items]    
Ownership% 50.00%  
Investment Balance $ 112 119
Description Wind-powered merchant generation facility  
Other    
Schedule of Equity Method Investments [Line Items]    
Investment Balance $ 84 32
Dominion Gas Holdings, LLC    
Schedule of Equity Method Investments [Line Items]    
Investment Balance $ 98 102
Dominion Gas Holdings, LLC | Iroquois    
Schedule of Equity Method Investments [Line Items]    
Ownership% [1] 24.07%  
Investment Balance $ 98 $ 102
Description Gas transmission system  
Dominion Midstream Partners, LP | Iroquois    
Schedule of Equity Method Investments [Line Items]    
Ownership% [1] 25.93%  
[1] Comprised of Dominion Midstream's interest of 25.93% and Dominion Gas' interest of 24.07%. See Note 15 for more information.