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Income Taxes (Reconciliation of Income Taxes at the U.S. Statutory Federal Rate as Compared to the Income Tax Expense Recorded in Our Consolidated Statements of Income) (Details) | 6 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
Income Taxes [Line Items] |  |
U.S. statutory rate | 35.00% | 35.00%
Increases (reductions) resulting from: |  |
State taxes, net of federal benefit | 2.80% | 4.30%
Investment tax credits | (5.50%) | (9.90%)
Production tax credits | (0.80%) | (0.80%)
State legislative change | 0.00% | (1.30%)
AFUDC - equity | (1.40%) | (0.70%)
Other, net | (2.60%) | (1.60%)
Effective tax rate | 27.50% | 25.00%
Virginia Electric and Power Company |  |
Income Taxes [Line Items] |  |
U.S. statutory rate | 35.00% | 35.00%
Increases (reductions) resulting from: |  |
State taxes, net of federal benefit | 3.70% | 4.00%
Investment tax credits | (0.80%) | (0.00%)
Production tax credits | (0.50%) | (0.60%)
State legislative change | 0.00% | 0.00%
AFUDC - equity | (0.60%) | (0.70%)
Other, net | (0.10%) | 0.20%
Effective tax rate | 36.70% | 37.90%
Dominion Energy Gas Holdings, LLC |  |
Income Taxes [Line Items] |  |
U.S. statutory rate | 35.00% | 35.00%
Increases (reductions) resulting from: |  |
State taxes, net of federal benefit | 1.50% | 3.80%
Investment tax credits | (0.00%) | (0.00%)
Production tax credits | (0.00%) | (0.00%)
State legislative change | 0.00% | 0.00%
AFUDC - equity | (1.00%) | (0.20%)
Other, net | 0.00% | 0.10%
Effective tax rate | 35.50% | 38.70%

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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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