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Guarantees
 6 Months Ended
Jun. 30, 2019
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, 2018. The changes in the carrying amount of service and product warranties and product performance guarantees for the six months ended June 30, 2019 and 2018 are as follows:
(dollars in millions)
 
2019
 
2018
Balance as of January 1
 
$
1,449

 
$
1,146

Warranties and performance guarantees issued
 
309

 
233

Settlements made
 
(241
)
 
(200
)
Other
 
5

 
(7
)
Balance as of June 30
 
$
1,522

 
$
1,172