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RETIREMENT PLANS (Tables)
 3 Months Ended
Mar. 31, 2016
Compensation and Retirement Disclosure [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
 
2016
 
2015
 
2016
 
2015
(Dollars in millions)
U.S.
 
Non-U.S.
 
U.S.
 
Non-U.S.
 
 
 
 
Components of net periodic benefit (credit) cost:
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
10

 
$
3

 
$
9

 
$
4

 
$
2

 
$
2

Interest cost
18

 
6

 
22

 
6

 
7

 
10

Expected return on assets
(34
)
 
(8
)
 
(36
)
 
(9
)
 
(2
)
 
(2
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
Prior service credit, net
(1
)
 
—

 
(1
)
 
—

 
(10
)
 
(6
)
Net periodic benefit (credit) cost
$
(7
)
 
$
1

 
$
(6
)
 
$
1

 
$
(3
)
 
$
4