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Related Party Transactions (Tables) (Virginia Electric and Power Company)
 6 Months Ended
Jun. 30, 2012
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,
 
2012
 
2011
2012
 
2011
(millions)
 
 
 
 
 
 
Commodity purchases from affiliates
$
78

 
$
90

$
156

 
$
152

Services provided by affiliates
95

 
100

191

 
193