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Acquisitions and Dispositions (Schedule of Unaudited Pro Forma Information) (Detail) - SCANA - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |
Operating Revenue | [1] | $ 15,408 | $ 15,344
Net income attributable to Dominion Energy | [1] | $ 3,266 | $ 2,081
Earnings Per Common Share – Basic | [1] | $ 4.04 | $ 2.78
Earnings Per Common Share – Diluted | [1] | $ 4.00 | $ 2.77
[1] | Amounts include adjustments for non-recurring costs directly related to the SCANA Combination.

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