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Guarantees (Tables)
 3 Months Ended
Mar. 31, 2018
Service and Product Warranties and Product Performance Guarantees [Abstract]  
Product Warranty Disclosure [Table Text Block]
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