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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Business Acquisition [Line Items] |  |  |  |  |
Operating Revenue | [1] | $ 3,970 | $ 3,910 | $ 8,835 | $ 8,546
Net income attributable to Dominion Energy | [1] | $ 392 | $ 456 | $ 962 | $ 1,131
Earnings Per Common Share – Basic | [1] | $ 0.49 | $ 0.61 | $ 1.21 | $ 1.51
Earnings Per Common Share – Diluted | [1] | $ 0.47 | $ 0.61 | $ 1.19 | $ 1.51
[1] | Amounts include adjustments for non-recurring costs directly related to the SCANA Combination.

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