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Acquisitions and Dispositions (Results of Operations and Pro Forma Information) (Narrative) (Detail) - SCANA [Member] - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |
Increase in operating revenue |  | $ 3,100 |
Decrease in net income |  | (1,100) |
Merger and integration-related costs | $ 1,300 | 484 |
Dominion Energy [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Merger and integration-related costs |  | 646 | $ 27
Dominion Energy [Member] | Voluntary Retirement Program [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Merger and integration-related costs |  | 427 |
Dominion Energy [Member] | Other operations and maintenance |  |  |
Business Acquisition [Line Items] |  |  |
Merger and integration-related costs |  | 210 |
Dominion Energy [Member] | Interest And Related Charges |  |  |
Business Acquisition [Line Items] |  |  |
Merger and integration-related costs |  | $ 9 |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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