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RETIREMENT PLANS (Tables)
 9 Months Ended
Sep. 30, 2015
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
 
2015
 
2014
 
2015
 
2014
(Dollars in millions)
U.S.
 
Non-U.S.
 
U.S.
 
Non-U.S.
 
 
 
 
Components of net periodic benefit (credit) cost:
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
10

 
$
3

 
$
11

 
$
4

 
$
2

 
$
2

Interest cost
21

 
7

 
24

 
7

 
9

 
11

Expected return on assets
(38
)
 
(9
)
 
(36
)
 
(9
)
 
(1
)
 
(2
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
Prior service (credit) cost
(1
)
 
—

 
(1
)
 
—

 
(6
)
 
(6
)
Net periodic benefit (credit) cost
$
(8
)
 
$
1

 
$
(2
)
 
$
2

 
$
4

 
$
5

 
 
 
 
 
 
 
 
 
 
 
 
 
First Nine Months
 
Pension Plans
 
Other Postretirement Benefit Plans
 
2015
 
2014
 
2015
 
2014
(Dollars in millions)
U.S.
 
Non-U.S.
 
U.S.
 
Non-U.S.
 
 
 
 
Components of net periodic benefit (credit) cost:
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
29

 
$
11

 
$
31

 
$
11

 
$
6

 
$
6

Interest cost
65

 
20

 
74

 
23

 
29

 
33

Expected return on assets
(111
)
 
(28
)
 
(107
)
 
(28
)
 
(4
)
 
(5
)
Curtailment gain(1)
—

 
(7
)
 
—

 
—

 
—

 
—

Amortization of:
 
 
 
 
 
 
 
 
 
 
 
Prior service (credit) cost
(3
)
 
—

 
(3
)
 
—

 
(18
)
 
(18
)
Mark-to-market pension and other postretirement benefits loss(2)
—

 
2

 
—

 
—

 
—

 
—

Net periodic benefit (credit) cost
$
(20
)
 
$
(2
)
 
$
(5
)
 
$
6

 
$
13

 
$
16