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Acquisitions and Dispositions (Schedule of Unaudited Pro Forma Information) (Detail) - Dominion Energy Questar Corporation - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | [1] | Sep. 30, 2019 | [1] | Sep. 30, 2018
Business Acquisition [Line Items] |  |  |  |
Operating Revenue | $ 4,269 | $ 4,356 | $ 13,104 | $ 12,902
Net income attributable to Dominion Energy | $ 1,029 | $ 923 | $ 1,991 | $ 2,054
Earnings Per Common Share – Basic | $ 1.28 | $ 1.23 | $ 2.47 | $ 2.74
Earnings Per Common Share – Diluted | $ 1.26 | $ 1.23 | $ 2.44 | $ 2.74
[1] | Amounts include adjustments for non-recurring costs directly related to the SCANA Combination.

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