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Acquisitions and Dispositions (Schedule of Unaudited Pro Forma Information) (Details) - Dominion Questar Corporation
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
$ / shares
[1]
Business Acquisition [Line Items]  
Operating Revenue | $ $ 3,377
Net income attributable to Dominion | $ $ 613
Earnings Per Common Share – Basic (in dollars per share) | $ / shares $ 1.03
Earnings Per Common Share – Diluted (in dollars per share) | $ / shares $ 1.03
[1] Amounts include adjustments for non-recurring costs directly related to the Dominion Questar Combination.