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Compensation and Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2012
Pension Plans
  
Pension and Other Postretirement Benefits  
Expense Components for Pension Plan
Expense components are:
 
Three months ended
September 30,
 
Nine months ended
September 30,
(in millions)
2012
 
2011
 
2012
 
2011
Service cost
$
46

 
$
38

 
$
120

 
$
114

Interest cost
45

 
47

 
135

 
141

Expected return on plan assets
(52
)
 
(56
)
 
(162
)
 
(168
)
Amortization of prior service cost
1

 
2

 
3

 
6

Amortization of net loss
15

 
4

 
45

 
12

Expense under accounting standards
$
55

 
$
35

 
$
141

 
$
105

Regulatory adjustment (deferred)
(57
)
 
(6
)
 
(3
)
 
(18
)
Total expense recognized
$
(2
)
 
$
29

 
$
138

 
$
87
Postretirement Benefits Other Than Pensions
  
Pension and Other Postretirement Benefits  
Expense Components for Pension Plan
Expense components are:
 
Three months ended
September 30,
 
Nine months ended
September 30,
(in millions)
2012
 
2011
 
2012
 
2011
Service cost
$
12

 
$
10

 
$
36

 
$
30

Interest cost
28

 
31

 
84

 
93

Expected return on plan assets
(27
)
 
(27
)
 
(81
)
 
(81
)
Special termination benefits1
3

 
—

 
3

 
—

Amortization of prior service credit
(9
)
 
(9
)
 
(27
)
 
(27
)
Amortization of net loss
11

 
9

 
33

 
27

Total expense
$
18

 
$
14

 
$
48

 
$
42

1 
Due to the reduction in the workforce at San Onofre, SCE has incurred costs for enhanced retiree health care coverage. See below for further information.