Guarantees (Tables)

6 Months Ended

Jun. 30, 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 six months ended June 30, 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	309			233
Settlements made	(241		)	(200		)
Other	5			(7		)
Balance as of June 30	$	1,522		$	1,172