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Investments (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Oct. 31, 2016
May 31, 2016
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Gain (Loss) on Investments [Line Items]          
Investment in equity method affiliates     $ 1,498   $ 1,320 [1]
Atlantic Coast Pipeline | Subsequent Event          
Gain (Loss) on Investments [Line Items]          
Membership interest percentage purchased 3.00%        
Membership interest purchased $ 14        
Membership interest percentage 48.00%        
Duke | Atlantic Coast Pipeline | Subsequent Event          
Gain (Loss) on Investments [Line Items]          
Membership interest percentage 47.00%        
Dominion Gas Holdings, LLC | Iroquois | Partnership Interest          
Gain (Loss) on Investments [Line Items]          
Equity in earnings on investments     14 $ 17  
Distributions received from investment     17 $ 26  
Investment in equity method affiliates     97   102
Carrying amount of investment that exceeded share of underlying equity     8   8
Percentage of non-controlling interests sold   0.65%      
Sales price   $ 7      
Gain on sale of interests   5      
After tax gain on sale of interests   $ 3      
Categories of Investments, Marketable Securities, Trading Securities          
Gain (Loss) on Investments [Line Items]          
Assets Held-in-trust     $ 103   $ 100
[1] Dominion’s Consolidated Balance Sheet at December 31, 2015 has been derived from the audited Consolidated Financial Statements at that date.