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PENSION AND POSTRETIREMENT BENEFIT PLANS (Tables)
3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]

The net periodic benefit cost of defined benefit pension plans includes:
 
Three Months Ended March 31,
Dollars in Millions
2020
 
2019
Service cost – benefits earned during the year
$
12

 
$
7

Interest cost on projected benefit obligation
8

 
44

Expected return on plan assets
(23
)
 
(64
)
Amortization of prior service credits
(1
)
 
(1
)
Amortization of net actuarial loss
11

 
18

Curtailments and settlements
2

 
49

Net periodic pension benefit cost
$
9

 
$
53