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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Product Warranty Liability [Table Text Block]
 
Year Ended December 31
 
2013
 
2012
 
(Dollars in Millions)
Beginning balance
$
57

 
$
66

Accruals for products shipped
17

 
19

Changes in estimates
(8
)
 
(6
)
Settlements
(17
)
 
(22
)
Ending balance
$
49

 
$
57