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Guarantees
3 Months Ended
Mar. 31, 2017
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, 2016. The changes in the carrying amount of service and product warranties and product performance guarantees for the quarter ended March 31, 2017 and 2016 are as follows:
(Dollars in millions)
 
2017
 
2016
Balance as of January 1
 
$
1,199

 
$
1,212

Warranties and performance guarantees issued
 
78

 
76

Settlements made
 
(56
)
 
(62
)
Other
 
1

 
10

Balance as of March 31
 
$
1,222

 
$
1,236