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Dispositions (Tables)
9 Months Ended
Sep. 30, 2012
Discontinued Operations and Disposal Groups [Abstract]  
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures
The following table presents selected information regarding the results of operations of Salem Harbor and State Line, which are classified in discontinued operations in Dominion's Consolidated Statements of Income for all periods presented:

 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2012
 
2011
 
2012
 
2011
(millions)
 
 
 
 
 
 
 
Operating revenue
$
5

 
$
58

 
$
57

 
$
185

Income (loss) before income taxes
(19
)
 
5

 
(49
)
 
(34
)