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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2014
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
Nine Months Ended September 30,
2014
2013
2014
2013
2014
2013
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
2.7

2.4

3.9

2.8

3.7

4.1

Investment tax credits
(6.0
)
(1.3
)
—

—

—

—

Production tax credits
(1.1
)
(0.5
)
(0.6
)
(0.2
)
—

—

Valuation allowances
0.6

—

—

—

—

—

AFUDC - equity
0.1

(0.7
)
0.1

(1.1
)
—

(0.1
)
Other, net
(0.6
)
(0.9
)
0.7

(0.3
)
0.1

0.2

Effective tax rate
30.7
 %
34.0
 %
39.1
 %
36.2
 %
38.8
%
39.2
 %