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Compensation and Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
Expense Components for Plans
Net periodic pension expense components for continuing operations are:
 
Three months ended June 30,
 
Six months ended June 30,
(in millions)
2018
 
2017 3
 
2018
 
2017 3
Edison International:
 
 
 
 
 
 
 
Service cost
$
32

 
$
36

 
$
64

 
$
72

Non-service cost
 
 
 
 
 
 
 
Interest cost
35

 
41

 
70

 
82

Expected return on plan assets
(56
)
 
(53
)
 
(113
)
 
(106
)
Settlement costs1
—

 
8

 
—

 
8

Amortization of prior service cost
—

 
1

 
1

 
2

Amortization of net loss2
2

 
5

 
4

 
10

Regulatory adjustment (deferred)
3

 
(3
)
 
5

 
(6
)
Total non-service cost
(16
)
 
(1
)
 
(33
)
 
(10
)
Total expense recognized
$
16

 
$
35

 
$
31

 
$
62

SCE:
 
 
 
 
 
 
 
Service cost
$
31

 
$
35

 
$
62

 
$
70

Non-service cost
 
 
 
 
 
 
 
Interest cost
32

 
37

 
64

 
74

Expected return on plan assets
(54
)
 
(50
)
 
(107
)
 
(100
)
Amortization of prior service cost
—

 
1

 
1

 
2

Amortization of net loss2
2

 
4

 
3

 
8

Regulatory adjustment (deferred)
3

 
(3
)
 
5

 
(6
)
Total non-service cost
(17
)
 
(11
)
 
(34
)
 
(22
)
Total expense recognized
$
14


$
24


$
28


$
48


1 
Under GAAP, a settlement is recorded when lump-sum payments exceed estimated annual service and interest costs. Lump-sum payments made in April 2017 to Edison International executives retiring in 2016 from the Executive Retirement Plan exceeded the estimated service and interest costs, resulting in a partial settlement of that plan. A settlement loss of approximately $8 million ($5 million after-tax) was recorded at Edison International in the second quarter of 2017.
2 
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 June 30, 2018, and $4 million and $3 million, respectively, for the six months ended June 30, 2018. The amount reclassified for Edison International and SCE was $2 million and $1 million, respectively, for the three months ended June 30, 2017, and $5 million and $3 million, respectively, for the six months ended June 30, 2017.
3 
During the first quarter of 2018, Edison International and SCE adopted an accounting standard retrospectively related to the presentation of the components of net periodic benefit costs for the defined benefit pension and other postretirement plans. Prior years' consolidated income statements have been updated to reflect the retrospective application of this accounting standard. Service and non-service costs are included in "Operation and maintenance" and "Other income and expenses," respectively, on the consolidated income statement. See Note 1 for further information.
PBOP Plan  
Defined Benefit Plan Disclosure [Line Items]  
Expense Components for Plans
Net periodic PBOP expense components for continuing operations are:
 
Three months ended June 30,
 
Six months ended June 30,
(in millions)
2018
 
2017 1
 
2018
 
2017 1
Edison International:
 
 
 
 
 
 
 
Service cost
$
10

 
$
9

 
$
19

 
$
18

Non-service cost
 
 
 
 
 
 
 
Interest cost
21

 
24

 
42

 
48

Expected return on plan assets
(30
)
 
(27
)
 
(60
)
 
(54
)
Amortization of prior service cost
(1
)
 
(1
)
 
(1
)
 
(2
)
Total non-service cost
(10
)
 
(4
)
 
(19
)
 
(8
)
Total expense
$
—

 
$
5

 
$
—

 
$
10

SCE:
 
 
 
 
 
 
 
Service cost
$
10

 
$
9

 
$
19

 
$
18

Non-service cost
 
 
 
 
 
 
 
Interest cost
21

 
24

 
42

 
48

Expected return on plan assets
(30
)
 
(27
)
 
(60
)
 
(54
)
Amortization of prior service cost
(1
)
 
(1
)
 
(1
)
 
(2
)
Total non-service cost
(10
)
 
(4
)
 
(19
)
 
(8
)
Total expense
$
—

 
$
5

 
$
—

 
$
10


1 
During the first quarter of 2018, Edison International and SCE adopted an accounting standard retrospectively related to the presentation of the components of net periodic benefit costs for the defined benefit pension and other postretirement plans. Prior years' consolidated income statements have been updated to reflect the retrospective application of this accounting standard. Service and non-service costs are included in "Operation and maintenance" and "Other income and expenses," respectively, on the consolidated income statement. See Note 1 for further information.