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RETIREMENT PLANS (Tables)
 6 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [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
 
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

 
$
10

 
$
4

 
$
1

 
$
2

Interest cost
19

 
6

 
22

 
7

 
7

 
10

Expected return on assets
(34
)
 
(8
)
 
(37
)
 
(10
)
 
(1
)
 
(1
)
Curtailment gain(1)
—

 
—

 
—

 
(7
)
 
—

 
—

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

 
(1
)
 
—

 
(10
)
 
(6
)
Mark-to-market pension and other postretirement benefits loss(2)
—

 
—

 
—

 
2

 
—

 
—

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

 
$
(6
)
 
$
(4
)
 
$
(3
)
 
$
5

 
 
 
 
 
 
 
 
 
 
 
 
 
First Six Months
 
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
$
20

 
$
6

 
$
19

 
$
8

 
$
3

 
$
4

Interest cost
37

 
12

 
44

 
13

 
14

 
20

Expected return on assets
(68
)
 
(16
)
 
(73
)
 
(19
)
 
(3
)
 
(3
)
Curtailment gain(1)
—

 
—

 
—

 
(7
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
 
 
 
 
Prior service credit, net
(2
)
 
—

 
(2
)
 
—

 
(20
)
 
(12
)
Mark-to-market pension and other postretirement benefits loss(2)
—

 
—

 
—

 
2

 
—

 
—

Net periodic benefit (credit) cost
$
(13
)
 
$
2

 
$
(12
)
 
$
(3
)
 
$
(6
)
 
$
9