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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) | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Operating Loss Carryforwards [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 | (4.20%) | (10.90%)
Production tax credits | (0.80%) | (0.80%)
Other, net | (3.80%) | (2.40%)
Effective tax rate | 29.00% | 25.20%
Virginia Electric and Power Company |  |
Operating Loss Carryforwards [Line Items] |  |
U.S. statutory rate | 35.00% | 35.00%
Increases (reductions) resulting from: |  |
State taxes, net of federal benefit | 3.80% | 4.20%
Investment tax credits | (0.80%) | (1.30%)
Production tax credits | (0.60%) | (0.60%)
Other, net | (0.60%) | (0.60%)
Effective tax rate | 36.80% | 36.70%
Dominion Gas Holdings, LLC |  |
Operating Loss Carryforwards [Line Items] |  |
U.S. statutory rate | 35.00% | 35.00%
Increases (reductions) resulting from: |  |
State taxes, net of federal benefit | 0.30% | 3.90%
Investment tax credits | (0.00%) | (0.00%)
Production tax credits | (0.00%) | (0.00%)
Other, net | (0.60%) | (0.10%)
Effective tax rate | 34.70% | 38.80%

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: 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=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: 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=6907707&loc=d3e32698-109319 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: 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=6907707&loc=d3e32698-109319 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=6907707&loc=d3e32687-109319 + Details
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