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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2015
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,
2015
2014
2015
2014
2015
2014
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
2.9

2.7

3.8

3.8

4.0

3.4

Investment tax credits
(0.8
)
(3.6
)
—

—

—

—

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

—

Other, net
(0.6
)
(0.8
)
(0.7
)
(0.2
)
(0.1
)
0.3

Effective tax rate
35.7
 %
32.7
 %
37.7
 %
37.8
 %
38.9
 %
38.7
%