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RETIREMENT PLANS (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Components of net periodic benefit cost
Components of net periodic benefit (credit) cost were as follows:
 
Third Quarter
 
Pension Plans
 
Other Postretirement Benefit Plans
 
2018
 
2017
 
2018
 
2017
(Dollars in millions)
U.S.
 
Non-U.S.
 
U.S.
 
Non-U.S.
 
 
 
 
Service cost
$
9

 
$
3

 
$
10

 
$
3

 
$
—

 
$
—

Interest cost
16

 
5

 
16

 
5

 
6

 
6

Expected return on assets
(36
)
 
(9
)
 
(35
)
 
(8
)
 
(2
)
 
(1
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
Prior service credit, net
—

 
—

 
(1
)
 
—

 
(10
)
 
(10
)
Net periodic benefit (credit) cost
$
(11
)
 
$
(1
)
 
$
(10
)
 
$
—

 
$
(6
)
 
$
(5
)
 
 
 
 
 
 
 
 
 
 
 
 
 
First Nine Months
 
Pension Plans
 
Other Postretirement Benefit Plans
 
2018
 
2017
 
2018
 
2017
(Dollars in millions)
U.S.
 
Non-U.S.
 
U.S.
 
Non-U.S.
 
 
 
 
Service cost
$
26

 
$
11

 
$
28

 
$
10

 
$
—

 
$
2

Interest cost
50

 
15

 
49

 
14

 
17

 
18

Expected return on assets
(110
)
 
(28
)
 
(105
)
 
(25
)
 
(4
)
 
(4
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
Prior service credit, net
—

 
—

 
(3
)
 
—

 
(30
)
 
(30
)
Net periodic benefit (credit) cost
$
(34
)
 
$
(2
)
 
$
(31
)
 
$
(1
)
 
$
(17
)
 
$
(14
)