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Long-term Debt (Tables)
 12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
 
December 31,
Dollar amounts in millions
2019
 
2018
 
Interest Rate
 
Principal
 
Unamortized Debt Costs
 
Total
 
Principal
 
Unamortized Debt Costs
 
Total
Debentures:
 
 
 
 
 
 
 
 
 
 
 
 
 
Senior unsecured notes, maturing 2024, interest rates fixed
4.875
%
 
$
350

 
$
(3
)
 
$
347

 
$
350

 
$
(4
)
 
$
346

Bank credit facilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
Chilean term credit facility, matured 2019, interest rates fixed
UF+3.9%

 
—

 
—

 
—

 
5

 
—

 
5

Other financing:
 
 
 
 
 
 
 
 
 
 
 
 
 
Financing leases
 
 
1

 
—

 
1

 
1

 
—

 
1

Total
 
 
351

 
(3
)
 
348

 
356

 
(4
)
 
352

Less: current portion
 
 
—

 
—

 
—

 
(5
)
 
—

 
(5
)
Long-term portion
 
 
$
351

 
$
(3
)
 
$
348

 
$
351

 
$
(4
)
 
$
347
Schedule of Maturities of Long-term Debt [Table Text Block]
The weighted average interest rate for all long-term debt at December 31, 2019 and 2018, was approximately 4.9%. Required repayment of principal for long-term debt is as follows:
 
Dollar amounts in millions
 
Years ending December 31,
 
2020
$
—

2021
1

2022
—

2023
—

2024
350

2025 and after
—

Total
$
351