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Investments (Narrative) (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2014
Member
mi
Mar. 31, 2014
USD ($)
Jan. 31, 2014
USD ($)
Mar. 31, 2013
USD ($)
Dec. 31, 2013
USD ($)
Sep. 30, 2013
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Gain (Loss) on Investments [Line Items]                  
Equity earnings on investments             $ 56 $ 46 $ 14
Company received distribution from Fowler Ridge in connection with non-recourse permanent financing             83 60 33
Carrying amount of Company's investments exceeded its shares of underlying equity             234 126  
Equity method investment goodwill             162 39  
Proceeds from Blue Racer             0 85 160
Write off of goodwill               42  
Finite Lived Equity Method Investment Basis Difference                  
Gain (Loss) on Investments [Line Items]                  
Carrying amount of Company's investments exceeded its shares of underlying equity             72 87  
Blue Racer                  
Gain (Loss) on Investments [Line Items]                  
Amount of consideration   $ 84              
Proceeds from Blue Racer   84   $ 47          
Increase in equity method investment           $ 473      
Increase in equity method investment     $ 155            
Realignment of nonregulated retail energy marketing to the Dominion Energy segment     $ 6            
Atlantic Coast Pipeline | Pipelines | Jointly Owned Natural Gas Pipeline | Distribution                  
Gain (Loss) on Investments [Line Items]                  
Ownership interest (percentage) 45.00%                
Length of FERC regulated interstate natural gas pipeline | mi 600                
Number of members | Member 4                
Duration of contract 20 years                
Atlantic Coast Pipeline | Pipelines | Duke Energy | Jointly Owned Natural Gas Pipeline | Distribution                  
Gain (Loss) on Investments [Line Items]                  
Ownership interest (percentage) 40.00%                
Atlantic Coast Pipeline | Pipelines | Piedmont | Jointly Owned Natural Gas Pipeline | Distribution                  
Gain (Loss) on Investments [Line Items]                  
Ownership interest (percentage) 10.00%                
Atlantic Coast Pipeline | Pipelines | AGL | Jointly Owned Natural Gas Pipeline | Distribution                  
Gain (Loss) on Investments [Line Items]                  
Ownership interest (percentage) 5.00%                
Other operations and maintenance expense | Blue Racer                  
Gain (Loss) on Investments [Line Items]                  
Gain from sale       25 $ 4        
After tax gain on sale   34   14 2        
Write off of goodwill       $ 2          
Dominion Gas Holdings, LLC                  
Gain (Loss) on Investments [Line Items]                  
Equity earnings on investments             23 21 22
Company received distribution from Fowler Ridge in connection with non-recourse permanent financing             28 20 19
Carrying amount of Company's investments exceeded its shares of underlying equity             8 8  
Proceeds from Blue Racer             0 1 $ 78
Write off of goodwill               3  
Dominion Gas Holdings, LLC | Blue Racer                  
Gain (Loss) on Investments [Line Items]                  
Proceeds from Blue Racer   17     30 78      
Extinguishment of affiliated current borrowings   67              
Dominion Gas Holdings, LLC | Other operations and maintenance expense | Blue Racer                  
Gain (Loss) on Investments [Line Items]                  
Gain from sale   59     3 74      
After tax gain on sale   35     $ 2 $ 41      
Write off of goodwill   $ 3              
Categories of Investments, Marketable Securities, Trading Securities                  
Gain (Loss) on Investments [Line Items]                  
Investments held in our rabbi trusts             $ 100 $ 110