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Other Operating Credits and Charges, Net Non-Operating Income and Expense (Tables)
 12 Months Ended
Dec. 31, 2019
Other Income and Expenses [Abstract]  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
Non-operating income (expense) is comprised of the following components:
 
 
Year ended December 31,
Dollar amounts in millions
2019
 
2018
 
2017
Interest expense
$
(18
)
 
$
(19
)
 
$
(20
)
Amortization of debt charges
(2
)
 
(1
)
 
(1
)
Capitalized interest
1

 
4

 
2

Interest expense, net of capitalized interest
(19
)
 
(16
)
 
(19
)
Interest income
9

 
18

 
10

Gain on securities
—

 
1

 
—

SERP market adjustments
1

 
(1
)
 
1

Investment income
10

 
18

 
11

Net periodic pension cost, excluding service cost
(3
)
 
(4
)
 
(10
)
Foreign currency losses
(5
)
 
—

 
(4
)
Gain on acquisition of controlling interest
14

 
—

 
—

Other non-operating income
6

 
(4
)
 
(14
)
Total non-operating income (expense)
$
(3
)
 
$
(2
)
 
$
(23
)