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Guarantees
 9 Months Ended
Sep. 30, 2018
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 financial guarantees outstanding since December 31, 2017. The changes in the carrying amount of service and product warranties and product performance guarantees for the nine months ended September 30, 2018 and 2017 are as follows:
(dollars in millions)
 
2018
 
2017
Balance as of January 1
 
$
1,146

 
$
1,199

Warranties and performance guarantees issued
 
472

 
221

Settlements made
 
(380
)
 
(194
)
Other
 
(8
)
 
21

Balance as of September 30
 
$
1,230

 
$
1,247