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RETIREMENT BENEFITS PLANS
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
RETIREMENT BENEFITS PLANS RETIREMENT BENEFITS PLANS
The components of retirement benefits expense follow:
 
 
United States
pension benefit expense
 
Non-United States
pension benefit expense
 
Other postretirement
benefits expense
 
 
Three months ended June 30
 
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
Service cost
$
23

 
$
25

 
$
15

 
$
16

 
$
1

 
$
—

 
Interest cost
34

 
31

 
14

 
13

 
4

 
4

 
Expected return on plan assets
(59
)
 
(64
)
 
(27
)
 
(26
)
 
(1
)
 
(1
)
 
Amortization
16

 
23

 
9

 
10

 
(4
)
 
(3
)
 
 
14

 
15

 
11

 
13

 
—

 
—

 
Settlements
13

 
11

 
1

 
—

 
—

 
—

 
Total expense
$
27

 
$
26

 
$
12

 
$
13

 
$
—

 
$
—

 
 
 
 
 
United States
pension benefit expense
 
Non-United States
pension benefit expense
 
Other postretirement
benefits expense
 
 
Six months ended June 30
 
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
Service cost
$
46

 
$
50

 
$
29

 
$
32

 
$
1

 
$
1

 
Interest cost
68

 
61

 
29

 
27

 
7

 
7

 
Expected return on plan assets
(117
)
 
(127
)
 
(54
)
 
(53
)
 
(1
)
 
(2
)
 
Amortization
31

 
47

 
19

 
20

 
(7
)
 
(6
)
 
 
28

 
31

 
23

 
26

 
—

 
—

 
Settlements
23

 
25

 
1

 
—

 
—

 
—

 
Total expense
$
51

 
$
56

 
$
24

 
$
26

 
$
—

 
$
—



The components of retirement benefits expense other than service costs are included in Other (income) expense - net.