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Guarantees (Tables)
 6 Months Ended
Jun. 30, 2015
Service and Product Warranties and Product Performance Guarantees [Abstract]  
Product Warranty Disclosure [Table Text Block]
(Dollars in millions)
 
2015
 
2014
Balance as of January 1
 
$
1,313

 
$
1,360

Warranties and performance guarantees issued
 
132

 
121

Settlements made
 
(141
)
 
(168
)
Other
 
(19
)
 
(9
)
Balance as of June 30
 
$
1,285

 
$
1,304