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Significant Accounting Policies (Other Cash Provided By (Used In) Investing Activities) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other Cash Provided By (Used In) Investing Activities [Line Items] |  |  |
Other cash provided by (used in) investing activities | $ 33 | $ 83 | $ (65)
Virginia Electric and Power Company |  |  |
Other Cash Provided By (Used In) Investing Activities [Line Items] |  |  |
Other cash provided by (used in) investing activities | (41) | (33) | (87)
Dominion Energy Gas Holdings, LLC |  |  |
Other Cash Provided By (Used In) Investing Activities [Line Items] |  |  |
Other cash provided by (used in) investing activities | (19) | (12) | (17)
Scenario, Previously Reported |  |  |
Other Cash Provided By (Used In) Investing Activities [Line Items] |  |  |
Other cash provided by (used in) investing activities | 29 | 47 | (71)
Scenario, Previously Reported | Virginia Electric and Power Company |  |  |
Other Cash Provided By (Used In) Investing Activities [Line Items] |  |  |
Other cash provided by (used in) investing activities | (51) | (33) | (87)
Scenario, Previously Reported | Dominion Energy Gas Holdings, LLC |  |  |
Other Cash Provided By (Used In) Investing Activities [Line Items] |  |  |
Other cash provided by (used in) investing activities | $ (23) | $ (18) | $ (11)

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- Definition Amount of cash (inflow) outflow from investing activities 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 9 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3098-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3095-108585 + Details
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