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Income Taxes (Reconciliation of Income Taxes at the U.S. Statutory Federal Income Tax Rate) (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Contingency [Line Items] |  |  |
U.S. statutory rate | 35.00% | 35.00% | 35.00%
Increases (reductions) resulting from: |  |  |
State taxes, net of federal benefit | 2.00% | 2.40% | 3.70%
Investment tax credits | (6.30%) | (11.70%) | (4.70%)
Production tax credits | (0.70%) | (0.80%) | (0.80%)
Valuation allowances | 0.20% | 1.20% | (0.30%)
Federal legislative change | (27.50%) |  |
State legislative change |  | (0.60%) | (0.10%)
AFUDC-equity | (1.40%) | (0.60%) | (0.30%)
Employee stock ownership plan deduction | (0.60%) | (0.60%) | (0.60%)
Other, net | (1.70%) | (1.40%) | 0.10%
Effective tax rate | (1.00%) | 22.90% | 32.00%
Virginia Electric and Power Company |  |  |
Income Tax Contingency [Line Items] |  |  |
U.S. statutory rate | 35.00% | 35.00% | 35.00%
Increases (reductions) resulting from: |  |  |
State taxes, net of federal benefit | 3.70% | 3.80% | 3.90%
Investment tax credits | (0.80%) |  | (0.60%)
Production tax credits | (0.40%) | (0.50%) | (0.60%)
Valuation allowances |  | 0.10% |
Federal legislative change | (4.00%) |  |
AFUDC-equity | (0.60%) | (0.60%) | (0.60%)
Other, net | 0.60% | (0.40%) | 0.60%
Effective tax rate | 33.50% | 37.40% | 37.70%
Dominion Energy Gas Holdings, LLC |  |  |
Income Tax Contingency [Line Items] |  |  |
U.S. statutory rate | 35.00% | 35.00% | 35.00%
Increases (reductions) resulting from: |  |  |
State taxes, net of federal benefit | 2.40% | 0.50% | 2.70%
Valuation allowances | 0.30% |  |
Federal legislative change | (29.50%) |  |
AFUDC-equity | (0.90%) | (0.20%) | 0.20%
Other, net | 0.40% | 0.10% | 0.30%
Effective tax rate | 7.70% | 35.40% | 38.20%

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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