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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2013
Compensation and Retirement Disclosure [Abstract]  
Net Periodic Benefit Cost
The components of Dominion's provision for net periodic benefit cost were as follows:
 
Pension Benefits
 
Other Postretirement Benefits
 
2013
 
2012
 
2013
 
2012
(millions)
 
 
 
 
 
 
 
Three Months Ended March 31,
 
 
 
 
 
 
 
Service cost
$
35

 
$
29

 
$
12

 
$
11

Interest cost
66

 
67

 
19

 
20

Expected return on plan assets
(114
)
 
(108
)
 
(22
)
 
(21
)
Amortization of prior service cost (credit)
1

 
1

 
(3
)
 
(3
)
Amortization of net loss
46

 
33

 
2

 
2

Net periodic benefit cost
$
34

 
$
22

 
$
8

 
$
9