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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2016
Income Tax Disclosure [Abstract]  
Effective Income Tax
For continuing operations, including noncontrolling interests, the statutory U.S. federal income tax rate reconciles to the Companies' effective income tax rate as follows:
 
Dominion
Virginia Power
Dominion Gas
Three Months Ended March 31,
2016
2015
2016
2015
2016
2015
U.S. statutory rate
35.0
 %
35.0
 %
35.0
 %
35.0
 %
35.0
 %
35.0
 %
Increases (reductions) resulting from:
 
 
 
 
 
 
State taxes, net of federal benefit
4.3

2.9

4.2

3.8

3.9

4.0

Investment tax credits
(10.9
)
(0.8
)
(1.3
)
—

—

—

Production tax credits
(0.8
)
(0.8
)
(0.6
)
(0.4
)
—

—

Other, net
(2.4
)
(0.6
)
(0.6
)
(0.7
)
(0.1
)
(0.1
)
Effective tax rate
25.2
 %
35.7
 %
36.7
 %
37.7
 %
38.8
 %
38.9
 %