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Pension Benefits (Tables)
 6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
The components of net periodic benefit cost associated with our U.S. pension plans are as follows:

 
Quarter ended
 
Year to date
 
2020
 
2019
 
2020
 
2019
Service cost
$
2

 
$
1

 
$
4

 
$
3

Interest cost
8

 
10

 
17

 
20

Expected return on plan assets
(11
)
 
(11
)
 
(22
)
 
(22
)
Amortization of net loss
3

 
1

 
7

 
1

Amortization of prior service cost
2

 
1

 
3

 
2

Net periodic benefit cost
$
4

 
$
2

 
$
9

 
$
4

 
 
 
 
 
 
 
 
Additional loss recognized due to settlements(a)
$
—

 
$
—

 
$
—

 
$
2



(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.