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PENSION AND POSTRETIREMENT BENEFIT PLANS (Tables)
 9 Months Ended
Sep. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The net periodic benefit cost/(credit) of defined benefit pension plans includes:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
Dollars in Millions
2017
 
2016
 
2017
 
2016
Service cost – benefits earned during the year
$
7

 
$
6

 
$
19

 
$
19

Interest cost on projected benefit obligation
48

 
45

 
142

 
145

Expected return on plan assets
(104
)
 
(104
)
 
(308
)
 
(314
)
Amortization of prior service credits
(1
)
 
(1
)
 
(3
)
 
(3
)
Amortization of net actuarial loss
20

 
22

 
61

 
62

Curtailments and settlements
22

 
19

 
91

 
66

Special termination benefits
—

 
—

 
—

 
1

Net periodic benefit cost/(credit)
$
(8
)
 
$
(13
)
 
$
2

 
$
(24
)