Guarantees (Tables)

9 Months Ended

Sep. 30, 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 nine months ended September 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	472			221
Settlements made	(380		)	(194		)
Other	(8		)	21
Balance as of September 30	$	1,230		$	1,247