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Other Operating and Non-Operating Income (Tables)
 6 Months Ended
Jun. 30, 2020
Nonoperating Income (Expense) [Abstract]  
Schedule of Other Operating Cost and Expense, by Component [Table Text Block]
Non-operating income is comprised of the following components:
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2020
 
2019
 
2020
 
2019
Interest expense
 
$
(6
)
 
$
(5
)
 
$
(11
)
 
$
(9
)
Amortization of debt charges
 
—

 
(1
)
 
(1
)
 
(1
)
Capitalized interest, net of reversals
 
—

 
1

 
—

 
2

Interest expense
 
(6
)
 
(4
)
 
(12
)
 
(8
)
 
 
 
 
 
 
 
 
 
Interest income
 
1

 
2

 
1

 
6

Gain on sale of auction rate securities
 
3

 
—

 
3

 
—

SERP market adjustments
 
—

 
—

 
(1
)
 
1

Investment income
 
4

 
2

 
3

 
7

 
 
 
 
 
 
 
 
 
Net periodic pension cost, excluding service cost
 
—

 
(1
)
 
(1
)
 
(1
)
Gain on acquisition of controlling interest
 
—

 
—

 
—

 
14

Foreign currency gain (loss)
 
(1
)
 
(1
)
 
5

 
(4
)
Other non-operating items
 
$
(1
)
 
$
(2
)
 
$
4

 
$
9