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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 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
Nine Months Ended September 30,
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
2.4

4.4

2.8

3.9

Investment and production tax credits
(1.8
)
(0.6
)
(0.2
)
—

Valuation allowances
—

(0.9
)
—

—

AFUDC - equity
(0.7
)
(0.9
)
(1.1
)
(0.8
)
Other, net
(0.9
)
(2.1
)
(0.3
)
0.1

Effective tax rate
34.0
 %
34.9
 %
36.2
 %
38.2
 %
Schedule of Unrecognized Tax Benefits Roll Forward
During the nine months ended September 30, 2013, Dominion's and Virginia Power's unrecognized tax benefits changed as follows:
 
Dominion
Virginia Power
(millions)
 
 
Balance at January 1, 2013
$293
$57
Increases - prior period positions
14

12

Decreases - prior period positions
(91
)
(42
)
Current period positions
21

7

Settlements
(2
)
(2
)
Expiration of statutes of limitations
(4
)
—

Balance at September 30, 2013
$231
$32