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Compensation and Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2019
Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
Expense Components for Plans
Net periodic pension expense components are:
 
Three months ended September 30,
 
Nine months ended September 30,
(in millions)
2019
 
2018
 
2019
 
2018
Edison International:
 
 
 
 
 
 
 
Service cost
$
31

 
$
32

 
$
95

 
$
96

Non-service cost (benefit)
 
 
 
 
 
 
 
Interest cost
38

 
35

 
116

 
105

Expected return on plan assets
(52
)
 
(56
)
 
(156
)
 
(169
)
Amortization of prior service cost
—

 
1

 
1

 
2

Amortization of net loss1
2

 
2

 
6

 
6

Regulatory adjustment
(4
)
 
2

 
(12
)
 
7

Total non-service benefit2
$
(16
)
 
$
(16
)
 
$
(45
)
 
$
(49
)
Total expense recognized
$
15

 
$
16

 
$
50

 
$
47

SCE:
 
 
 
 
 
 
 
Service cost
$
31

 
$
31

 
$
93

 
$
93

Non-service cost (benefit)
 
 
 
 
 
 
 
Interest cost
35

 
32

 
106

 
96

Expected return on plan assets
(48
)
 
(52
)
 
(146
)
 
(159
)
Amortization of prior service cost
—

 
1

 
1

 
2

Amortization of net loss1
1

 
1

 
4

 
4

Regulatory adjustment
(4
)
 
2

 
(12
)
 
7

Total non-service benefit2
$
(16
)
 
$
(16
)
 
$
(47
)
 
$
(50
)
Total expense recognized
$
15

 
$
15

 
$
46

 
$
43


1 
Includes the amount of net loss reclassified from other comprehensive loss. The amount reclassified for Edison International and SCE was $2 million and $2 million, respectively, for the three months ended September 30, 2019, and $6 million and $5 million, respectively, for the nine months ended September 30, 2019. The amount reclassified for Edison International and SCE was $2 million and $1 million, respectively, for the three months ended September 30, 2018, and $6 million and $4 million, respectively, for the nine months ended September 30, 2018.
2 Included in "Other income and (expense)" on Edison International's and SCE's consolidated statement of income.
PBOP Plan 
Defined Benefit Plan Disclosure [Line Items]  
Expense Components for Plans
Net periodic PBOP expense components for Edison International and SCE are:
 
Three months ended September 30,
 
Nine months ended September 30,
(in millions)
2019
 
2018
 
2019
 
2018
Service cost
$
8

 
$
10

 
$
24

 
$
29

Non-service cost (benefit)
 
 
 
 
 
 
 
Interest cost
21

 
21

 
63

 
63

Expected return on plan assets
(28
)
 
(31
)
 
(84
)
 
(91
)
Amortization of prior service cost
(1
)
 
—

 
(1
)
 
(1
)
   Amortization of net gain
—

 
—

 
(2
)
 
—

 Regulatory adjustment
5

 
—

 
17

 
—

Total non-service benefit1
$
(3
)
 
$
(10
)
 
$
(7
)
 
$
(29
)
Total expense
$
5

 
$
—

 
$
17

 
$
—


1 Included in "Other income and (expense)" on Edison International's and SCE's consolidated statement of income.