Guarantees (Tables)

3 Months Ended

Mar. 31, 2019

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 quarters ended March 31, 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	137			115
Settlements made	(110		)	(106		)
Other	9			6
Balance as of March 31	$	1,485		$	1,161