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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2017
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,
2017
2016
2017
2016
2017
2016
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
2.8

4.3

3.8

4.2

0.3

3.9

Investment tax credits
(4.2
)
(10.9
)
(0.8
)
(1.3
)
—

—

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

—

Other, net
(3.8
)
(2.4
)
(0.6
)
(0.6
)
(0.6
)
(0.1
)
Effective tax rate
29.0
 %
25.2
 %
36.8
 %
36.7
 %
34.7
 %
38.8
 %