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Compensation and Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2018
Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
Expense Components for Plans
Net periodic pension expense components for continuing operations are:
 
Edison International
 
SCE
 
Three months ended March 31,
(in millions)
2018
 
2017 2
 
2018
 
2017 2
Service cost
$
32

 
$
36

 
$
31

 
$
35

Interest cost
35

 
41

 
32

 
37

Expected return on plan assets
(57
)
 
(53
)
 
(53
)
 
(50
)
Amortization of prior service cost
1

 
1

 
1

 
1

Amortization of net loss1
2

 
5

 
1

 
4

Regulatory adjustment (deferred)
2

 
(3
)
 
2

 
(3
)
Total non-service cost
$
(17
)
 
$
(9
)
 
$
(17
)
 
$
(11
)
Total expense recognized
$
15

 
$
27

 
$
14

 
$
24


1 
Includes the amount of net loss reclassified from other comprehensive loss. The amount reclassified for Edison International and SCE was $2 million and $1 million, respectively, for the three months ended March 31, 2018, and $3 million and $2 million, respectively, for the three months ended March 31, 2017.
2 
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:
 
Edison International
 
SCE
 
Three months ended March 31,
(in millions)
2018
 
2017 1
 
2018
 
2017 1
Service cost
$
9

 
$
9

 
$
9

 
$
9

Interest cost
21

 
24

 
21

 
24

Expected return on plan assets
(30
)
 
(27
)
 
(30
)
 
(27
)
Amortization of prior service cost
—

 
(1
)
 
—

 
(1
)
Total non-service cost
$
(9
)
 
$
(4
)
 
$
(9
)
 
$
(4
)
Total expense
$
—

 
$
5

 
$
—

 
$
5


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.