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Significant Accounting Policies (Other Adjustments from Operating Activities) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other Adjustments from Operating Activities [Line Items] |  |  |
Other adjustments from operating activities | $ (84) | $ (84) | $ (26)
Dominion Energy Gas Holdings, LLC |  |  |
Other Adjustments from Operating Activities [Line Items] |  |  |
Other adjustments from operating activities | (7) | (6) | 23
Scenario, Previously Reported |  |  |
Other Adjustments from Operating Activities [Line Items] |  |  |
Other adjustments from operating activities | (37) | (108) | (42)
Scenario, Previously Reported | Dominion Energy Gas Holdings, LLC |  |  |
Other Adjustments from Operating Activities [Line Items] |  |  |
Other adjustments from operating activities | $ (9) | $ (6) | $ 16

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- Definition Amount of income (expense) included in net income that results in no cash inflow (outflow), classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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