Guarantees (Tables)

6 Months Ended

Jun. 30, 2017

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, 2017 and 2016 are as follows:

(Dollars in millions)	2017			2016
Balance as of January 1	$	1,199		$	1,212
Warranties and performance guarantees issued	142			154
Settlements made	(120		)	(131		)
Other	13			6
Balance as of June 30	$	1,234		$	1,241