Guarantees (Tables)

3 Months Ended

Mar. 31, 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 quarter ended March 31, 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	78			76
Settlements made	(56		)	(62		)
Other	1			10
Balance as of March 31	$	1,222		$	1,236