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RETIREMENT PLANS (Tables)
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Components of net periodic benefit cost
Components of net periodic benefit (credit) cost were as follows:
 
Second 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

 
$
4

 
$
8

 
$
4

 
$
—

 
$
—

Interest cost
19

 
5

 
17

 
5

 
7

 
5

Expected return on assets
(33
)
 
(8
)
 
(37
)
 
(10
)
 
(1
)
 
—

Amortization of:
 
 
 
 
 
 
 
 
 
 
 
Prior service credit, net
—

 
—

 
—

 
—

 
(10
)
 
(10
)
Net periodic benefit (credit) cost
$
(7
)
 
$
1

 
$
(12
)
 
$
(1
)
 
$
(4
)
 
$
(5
)
 
 
 
 
 
 
 
 
 
 
 
 
 
First Six Months
 
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
$
14

 
$
7

 
$
17

 
$
8

 
$
—

 
$
—

Interest cost
38

 
10

 
34

 
10

 
13

 
11

Expected return on assets
(65
)
 
(16
)
 
(74
)
 
(19
)
 
(2
)
 
(2
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
Prior service credit, net
—

 
—

 
—

 
—

 
(20
)
 
(20
)
Net periodic benefit (credit) cost
$
(13
)
 
$
1

 
$
(23
)
 
$
(1
)
 
$
(9
)
 
$
(11
)