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Acquisitions and Dispositions (Schedule of Unaudited Pro Forma Information) (Details) - Dominion Questar Corporation - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
[1]
Dec. 31, 2015
Business Acquisition [Line Items]    
Operating Revenue $ 12,497 $ 12,818
Net Income $ 2,300 $ 2,108
Earnings Per Common Share – Basic $ 3.73 $ 3.56
Earnings Per Common Share – Diluted $ 3.73 $ 3.55
[1] Amounts include adjustments for non-recurring costs directly related to the Dominion Questar Combination.