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Employee Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2011
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
 
2011
 
2010
 
2011
 
2010
(millions)
 
 
 
 
 
 
 
Three Months Ended September 30,
 
 
 
 
 
 
 
Service cost
$
27

 
$
25

 
$
12

 
$
13

Interest cost
65

 
66

 
24

 
26

Expected return on plan assets
(110
)
 
(103
)
 
(21
)
 
(17
)
Amortization of prior service cost (credit)
—

 
1

 
(3
)
 
(2
)
Amortization of net loss
24

 
15

 
3

 
3

Net periodic benefit cost
$
6

 
$
4

 
$
15

 
$
23

Nine Months Ended September 30,
 
 
 
 
 
 
 
Service cost
$
81

 
$
77

 
$
36

 
$
41

Interest cost
194

 
200

 
71

 
76

Expected return on plan assets
(331
)
 
(308
)
 
(60
)
 
(52
)
Amortization of prior service cost (credit)
2

 
3

 
(10
)
 
(5
)
Amortization of net loss
72

 
45

 
9

 
9

Settlements and curtailments(1)
—

 
84

 
(1
)
 
37

Special termination benefits(2)
—

 
10

 
—

 
1

Net periodic benefit cost
$
18

 
$
111

 
$
45

 
$
107

(1)
2010 amounts relate to the sale of Peoples and a workforce reduction program.
(2)
Represents a one-time special termination benefit for certain employees in connection with a workforce reduction program.