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Pension Benefits (Tables)
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
The components of net periodic benefit cost associated with our significant U.S. pension plans are as follows:

 
Quarter ended
 
Year to date
 
2019
 
2018
 
2019
 
2018
Service cost
$
1

 
$
1

 
$
4

 
$
5

Interest cost
10

 
9

 
30

 
27

Expected return on plan assets
(11
)
 
(10
)
 
(33
)
 
(31
)
Amortization of net loss
—

 
4

 
1

 
11

Amortization of prior service cost
2

 
1

 
4

 
4

Net periodic benefit cost
$
2

 
$
5

 
$
6

 
$
16

 
 
 
 
 
 
 
 
Additional loss recognized due to settlements(a)
$
1

 
$
—

 
$
3

 
$
—

Special termination benefits
$
—

 
$
1

 
$
—

 
$
1



(a)
Loss is a result of settlement transactions which exceeded the sum of annual service and interest costs for the applicable plan. These losses were recorded in Other pension (income) expense.