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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2012
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
Nine Months Ended September 30,
2012
 
2011
 
2012
 
2011
U.S. statutory rate
35.0
 %
 
35.0
 %
 
35.0
 %
 
35.0
 %
Increases (reductions) resulting from:
 
 
 
 
 
 
 
State taxes, net of federal benefit
5.0

 
3.6

 
3.9

 
3.9

AFUDC - equity
(1.1
)
 
(0.5
)
 
(0.8
)
 
(0.6
)
Employee stock ownership plan deduction
(0.8
)
 
(0.6
)
 
—

 
—

Production tax credits
(0.7
)
 
(0.5
)
 
—

 
—

Valuation allowances
(0.6
)
 
0.1

 
—

 
—

Other, net
(1.3
)
 
(0.2
)
 
0.1

 
0.1

Effective tax rate
35.5
 %
 
36.9
 %
 
38.2
 %
 
38.4
 %