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Guarantees
 6 Months Ended
Jun. 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 guarantees outstanding since December 31, 2017. The changes in the carrying amount of service and product warranties and product performance guarantees for the six months ended June 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
 
233

 
142

Settlements made
 
(200
)
 
(120
)
Other
 
(7
)
 
13

Balance as of June 30
 
$
1,172

 
$
1,234