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Guarantees
 6 Months Ended
Jun. 30, 2015
Service and Product Warranties and Product Performance Guarantees [Abstract]  
Guarantees [Text Block]
Guarantees
We extend a variety of financial, market value and product performance guarantees to third parties. There have been no material changes to guarantees outstanding since December 31, 2014. The changes in the carrying amount of service and product warranties and product performance guarantees for the six months ended June 30, 2015 and 2014 are as follows:
(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