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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Product Warranty Liability [Table Text Block]
 
Year Ended December 31
 
2017
 
2016
 
(Dollars in Millions)
Beginning balance
$
55

 
$
38

Accruals for products shipped
20

 
17

Change in estimates
4

 
6

Specific cause actions
6

 
15

Recoverable warranty/recalls
3

 
2

Foreign currency translation
2

 
(2
)
Settlements
(41
)
 
(21
)
Ending balance
$
49

 
$
55