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RETIREMENT PLANS (Tables)
 9 Months Ended
Sep. 30, 2016
Compensation and Retirement Disclosure [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
 
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
$
9

 
$
3

 
$
10

 
$
3

 
$
2

 
$
2

Interest cost
18

 
5

 
21

 
7

 
7

 
9

Expected return on assets
(34
)
 
(7
)
 
(38
)
 
(9
)
 
(1
)
 
(1
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
Prior service credit, net
(1
)
 
—

 
(1
)
 
—

 
(11
)
 
(6
)
Mark-to-market pension and other postretirement benefits loss(1)
—

 
30

 
—

 
—

 
—

 
—

Net periodic benefit (credit) cost
$
(8
)
 
$
31

 
$
(8
)
 
$
1

 
$
(3
)
 
$
4

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
First Nine 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
$
29

 
$
9

 
$
29

 
$
11

 
$
5

 
$
6

Interest cost
55

 
17

 
65

 
20

 
21

 
29

Expected return on assets
(102
)
 
(23
)
 
(111
)
 
(28
)
 
(4
)
 
(4
)
Curtailment gain(2)
—

 
—

 
—

 
(7
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
 
 
 
 
Prior service credit, net
(3
)
 
—

 
(3
)
 
—

 
(31
)
 
(18
)
Mark-to-market pension and other postretirement benefits loss(1)
—

 
30

 
—

 
2

 
—

 
—

Net periodic benefit (credit) cost
$
(21
)
 
$
33

 
$
(20
)
 
$
(2
)
 
$
(9
)
 
$
13



(1) 
In third quarter 2016, a change to a UK pension plan triggered an interim remeasurement of the plan obligation and resulted in a $30 million mark-to-market loss and in 2015 the closure of the Workington, UK acetate tow manufacturing site triggered an interim remeasurement of a UK pension plan obligation both included in Other in Note 18, "Segment Information".
(2) 
Gain in the Fibers segment due to the closure of the Workington, UK acetate tow manufacturing site.