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Guarantees
 3 Months Ended
Mar. 31, 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 quarter ended March 31, 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
 
115

 
78

Settlements made
 
(106
)
 
(56
)
Other
 
6

 
1

Balance as of March 31
 
$
1,161

 
$
1,222