Guarantees (Tables)

9 Months Ended

Sep. 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 nine months ended September 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	464			472
Settlements made	(375		)	(380		)
Other	(15		)	(8		)
Balance as of September 30	$	1,523		$	1,230