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Guarantees
 9 Months Ended
Sep. 30, 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 nine months ended September 30, 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
 
221

 
218

Settlements made
 
(194
)
 
(192
)
Other
 
21

 
—

Balance as of September 30
 
$
1,247

 
$
1,238