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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2012
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
 
2012
 
2011
 
2012
 
2011
(millions)
 
 
 
 
 
 
 
Three Months Ended March 31,
 
 
 
 
 
 
 
Service cost
$
29

 
$
27

 
$
11

 
$
12

Interest cost
67

 
64

 
20

 
23

Expected return on plan assets
(108
)
 
(110
)
 
(21
)
 
(20
)
Amortization of prior service cost (credit)
1

 
1

 
(3
)
 
(3
)
Amortization of net loss
33

 
24

 
2

 
3

Net periodic benefit cost
$
22

 
$
6

 
$
9

 
$
15