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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 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 September 30,
 
 
 
 
Service cost
$
31

$
29

$
10

$
11

Interest cost
69

67

19

20

Expected return on plan assets
(116
)
(108
)
(24
)
(19
)
Amortization of prior service credit
—

—

(3
)
(4
)
Amortization of net loss
37

33

2

2

Settlements and curtailments(1)
—

—

—

(4
)
Net periodic benefit cost
$
21

$
21

$
4

$
6

Nine Months Ended September 30,
 
 
 
 
Service cost
$
100

$
87

$
34

$
33

Interest cost
202

201

56

60

Expected return on plan assets
(345
)
(323
)
(68
)
(60
)
Amortization of prior service cost (credit)
2

2

(9
)
(10
)
Amortization of net loss
127

99

6

5

Settlements and curtailments(1)(2)
(2
)
—

(15
)
(4
)
Net periodic benefit cost
$
84

$
66

$
4

$
24


(1) 2012 amount relates primarily to the