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Discontinued Operations (Tables)
 3 Months Ended
Mar. 31, 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 March 31
 
2018
 
2017
 
(Dollars in Millions)
Restructuring expense
$
(1
)
 
$
—

Gain on Climate Transaction
3

 
7

Income tax benefit
—

 
1

Income from discontinued operations, net of tax

$
2

 
$
8