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RETIREMENT PLANS (Tables)
3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Components of net periodic benefit cost Components of net periodic benefit (credit) cost were as follows:
 
First Quarter
 
Pension Plans
 
Other Postretirement Benefit Plans
 
2019
 
2018
 
2019
 
2018
(Dollars in millions)
U.S.
 
Non-U.S.
 
U.S.
 
Non-U.S.
 
 
 
 
Service cost
$
7

 
$
3

 
$
9

 
$
4

 
$

 
$

Interest cost
19

 
5

 
17

 
5

 
6

 
6

Expected return on assets
(32
)
 
(8
)
 
(37
)
 
(9
)
 
(1
)
 
(2
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
Prior service credit, net

 

 

 

 
(10
)
 
(10
)
Net periodic benefit (credit) cost
$
(6
)
 
$

 
$
(11
)
 
$

 
$
(5
)
 
$
(6
)