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RETIREMENT PLANS (Tables)
 6 Months Ended
Jun. 30, 2018
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
 
2018
 
2017
 
2018
 
2017
(Dollars in millions)
U.S.
 
Non-U.S.
 
U.S.
 
Non-U.S.
 
 
 
 
Service cost
$
8

 
$
4

 
$
9

 
$
4

 
$
—

 
$
1

Interest cost
17

 
5

 
16

 
4

 
5

 
6

Expected return on assets
(37
)
 
(10
)
 
(35
)
 
(9
)
 
—

 
(1
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
Prior service credit, net
—

 
—

 
(1
)
 
—

 
(10
)
 
(10
)
Net periodic benefit (credit) cost
$
(12
)
 
$
(1
)
 
$
(11
)
 
$
(1
)
 
$
(5
)
 
$
(4
)
 
 
 
 
 
 
 
 
 
 
 
 
 
First Six 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
$
17

 
$
8

 
$
18

 
$
7

 
$
—

 
$
2

Interest cost
34

 
10

 
33

 
9

 
11

 
12

Expected return on assets
(74
)
 
(19
)
 
(70
)
 
(17
)
 
(2
)
 
(3
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
Prior service credit, net
—

 
—

 
(2
)
 
—

 
(20
)
 
(20
)
Net periodic benefit (credit) cost
$
(23
)
 
$
(1
)
 
$
(21
)
 
$
(1
)
 
$
(11
)
 
$
(9
)