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PENSION AND POSTRETIREMENT BENEFIT PLANS (Tables)
 9 Months Ended
Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The net periodic benefit cost/(credit) of defined benefit pension and postretirement benefit plans includes:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
Pension Benefits
 
Other Benefits
 
Pension Benefits
 
Other Benefits
Dollars in Millions
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Service cost – benefits earned during the year
$
6

 
$
6

 
$
1

 
$
1

 
$
19

 
$
18

 
$
3

 
$
3

Interest cost on projected benefit obligation
45

 
60

 
2

 
3

 
145

 
181

 
7

 
9

Expected return on plan assets
(104
)
 
(102
)
 
(6
)
 
(7
)
 
(314
)
 
(307
)
 
(18
)
 
(20
)
Amortization of prior service credits
(1
)
 
—

 
—

 
(1
)
 
(3
)
 
(2
)
 
(2
)
 
(4
)
Amortization of net actuarial (gain)/loss
22

 
20

 
(1
)
 
1

 
62

 
70

 
(1
)
 
3

Curtailments and settlements
19

 
48

 
—

 
—

 
66

 
111

 
—

 
—

Special termination benefits
—

 
—

 
—

 
—

 
1

 
—

 
—

 
—

Net periodic benefit cost/(credit)
$
(13
)
 
$
32

 
$
(4
)
 
$
(3
)
 
$
(24
)
 
$
71

 
$
(11
)
 
$
(9
)