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Investments (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
May 31, 2016
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Gain (Loss) on Investments [Line Items]        
Investment in equity method affiliates   $ 1,372   $ 1,320 [1]
Dominion Gas Holdings, LLC | Iroquois | Partnership Interest        
Gain (Loss) on Investments [Line Items]        
Equity in earnings on investments   9 $ 12  
Distributions received from investment   11 $ 12  
Investment in equity method affiliates   98   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   $ 104   $ 100
[1] Dominion’s Consolidated Balance Sheet at December 31, 2015 has been derived from the audited Consolidated Financial Statements at that date.