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Related Party Transactions (Tables) (Virginia Electric and Power Company)
 6 Months Ended
Jun. 30, 2013
Virginia Electric and Power Company
  
Related Party Transaction [Line Items]  
Transactions With Affiliates
Presented below are significant transactions with DRS and other affiliates:

 
Three Months Ended June 30,
Six Months Ended June 30,
 
2013
2012
2013
2012
(millions)
 
 
 
 
Commodity purchases from affiliates
$
105

$
78

$
190

$
156

Services provided by affiliates
106

95

202

191