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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2013
Income Tax Disclosure [Abstract]  
Effective Income Tax
For continuing operations, including noncontrolling interests, the statutory U.S. federal income tax rate reconciles to Dominion's and Virginia Power’s effective income tax rate as follows:
 
Dominion
 
Virginia Power
Three Months Ended March 31,
2013
 
2012
 
2013
 
2012
U.S. statutory rate
35.0
 %
 
35.0
 %
 
35.0
 %
 
35.0
 %
Increases (reductions) resulting from:
 
 
 
 
 
 
 
State taxes, net of federal benefit
4.0

 
4.0

 
3.9

 
3.9

Investment and production tax credits
(1.5
)
 
(0.5
)
 
—

 
—

Valuation allowances
0.1

 
(2.6
)
 
—

 
—

AFUDC - equity
(0.7
)
 
(0.7
)
 
(1.3
)
 
(0.9
)
Other, net
(0.4
)
 
(0.7
)
 
0.2

 
(0.2
)
Effective tax rate
36.5
 %
 
34.5
 %
 
37.8
 %
 
37.8
 %