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Discontinued Operations (Tables)
 6 Months Ended
Jun. 30, 2018
Discontinued Operations and Disposal Groups [Abstract]  
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]
Discontinued operations are summarized as follows:
 
Three Months Ended June 30
 
Six Months Ended
June 30
 
2018
 
2017
 
2018
 
2017
 
(Dollars in Millions)
Selling, general and administrative expenses
$
(1
)
 
$
—

 
$
(1
)
 
$
—

Restructuring expense
—

 
—

 
(1
)
 
—

Gain on Climate Transaction
—

 
—

 
3

 
7

Income tax benefit
—

 
—

 
—

 
1

(Loss) income from discontinued operations, net of tax
$
(1
)
 
$
—

 
$
1

 
$
8