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Acquisitions and Dispositions (Schedule of Unaudited Pro Forma Information) (Details) - Dominion Energy Questar Corporation - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Business Acquisition [Line Items]    
Operating Revenue [1] $ 2,772 $ 6,149
Net income attributable to Dominion Energy [1] $ 490 $ 1,103
Earnings Per Common Share – Basic [1] $ 0.80 $ 1.82
Earnings Per Common Share – Diluted [1] $ 0.80 $ 1.82
[1] Amounts include adjustments for non-recurring costs directly related to the Dominion Energy Questar Combination.