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RETIREMENT BENEFIT PLANS (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Retirement Benefits Plans Expense
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 March 31
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Service cost
$
25

 
$
24

 
$
16

 
$
17

 
$
1

 
$
1

Interest cost
30

 
31

 
14

 
13

 
3

 
3

Expected return on plan assets
(63
)
 
(61
)
 
(27
)
 
(23
)
 
(1
)
 
(1
)
Amortization
24

 
20

 
10

 
13

 
(3
)
 
(3
)
 
16

 
14

 
13

 
20

 
—

 
—

Settlements
14

 
17

 
—

 
—

 
—

 
—

Total expense
$
30

 
$
31

 
$
13

 
$
20

 
$
—

 
$
—