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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2013
Compensation and Retirement Disclosure [Abstract]  
Net Periodic Benefit Cost
The components of Dominion's provision for net periodic benefit cost (credit) were as follows:
 
Pension Benefits
Other Postretirement Benefits
 
2013
2012
2013
2012
(millions)
 
 
 
 
Three Months Ended June 30,
 
 
 
 
Service cost
$
34

$
29

$
12

$
11

Interest cost
67

67

18

20

Expected return on plan assets
(115
)
(107
)
(22
)
(20
)
Amortization of prior service cost (credit)
1

1

(3
)
(3
)
Amortization of net loss
44

33

2

1

Settlements and curtailments(1)
(2
)
—

(15
)
—

Net periodic benefit cost (credit)
$
29

$
23

$
(8
)
$
9

Six Months Ended June 30,
 
 
 
 
Service cost
$
69

$
58

$
24

$
22

Interest cost
133

134

37

40

Expected return on plan assets
(229
)
(215
)
(44
)
(41
)
Amortization of prior service cost (credit)
2

2

(6
)
(6
)
Amortization of net loss
90

66

4

3

Settlements and curtailments(1)
(2
)
—

(15
)
—

Net periodic benefit cost
$
63

$
45

$
—

$
18


(1) Relate primarily to the decommissioning of Kewaunee.