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PENSION AND POSTRETIREMENT BENEFIT PLANS (Tables)
 6 Months Ended
Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Benefit Costs [Table Text Block]
The net periodic benefit cost/(credit) of defined benefit pension plans includes:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
Dollars in Millions
2018
 
2017
 
2018
 
2017
Service cost – benefits earned during the year
$
7

 
$
6

 
$
14

 
$
12

Interest cost on projected benefit obligation
50

 
46

 
96

 
94

Expected return on plan assets
(109
)
 
(101
)
 
(218
)
 
(204
)
Amortization of prior service credits
(1
)
 
(1
)
 
(2
)
 
(2
)
Amortization of net actuarial loss
19

 
20

 
40

 
41

Curtailments and settlements
38

 
36

 
69

 
69

Net periodic pension benefit cost/(credit)
$
4

 
$
6

 
$
(1
)
 
$
10