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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2016
Income Tax Disclosure [Abstract]  
Effective Income Tax
For continuing operations, including noncontrolling interests, the statutory United States federal income tax rate reconciles to the Companies' effective income tax rate as follows:
 
Dominion
Virginia Power
Dominion Gas
Nine Months Ended September 30,
2016
2015
2016
2015
2016
2015
United States statutory rate
35.0
 %
35.0
 %
35.0
 %
35.0
 %
35.0
%
35.0
%
Increases (reductions) resulting from:
 
 
 
 
 
 
State taxes, net of federal benefit
3.7

4.0

3.9

4.2

0.8

4.1

Investment tax credits
(10.4
)
(3.5
)
—

—

—

—

Production tax credits
(0.8
)
(0.8
)
(0.5
)
(0.5
)
—

—

State legislative change
(0.8
)
(0.2
)
—

—

—

—

Other, net
(2.1
)
(0.7
)
(0.5
)
(0.2
)
0.4

0.4

Effective tax rate
24.6
 %
33.8
 %
37.9
 %
38.5
 %
36.2
%
39.5
%