Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets

The components of intangible assets were as follows:

	December 31, 2014										December 31, 2013
													Assets
	Gross								Net		Gross		Classified						Net
	Carrying		Accumulated						Intangible		Carrying		as Held for			Accumulated			Intangible
(Dollars in millions)	Amount		Amortization			Impairment			Assets		Amount		Sale			Amortization			Assets
Acquired technology	$	420	$	(287	)	$	—		$	133	$	417	(4		)	$	(238	)	$	175
Licenses	242		(169		)	—			73		261		(1		)	(161		)	99
Patents	232		(117		)	—			115		271		(4		)	(129		)	138
Customer relationships and contracts	205		(122		)	(5		)	78		329		(46		)	(163		)	120
Other	85		(38		)	(6		)	41		91		(5		)	(52		)	34
	$	1,184	$	(733	)	$	(11	)	$	440	$	1,369	$	(60	)	$	(743	)	$	566

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

Future estimated amortization expense for the carrying amount of intangible assets as of December 31, 2014 is expected to be as follows (dollars in millions): 

Period	Amount
2015	$	71
2016	58
2017	58
2018	54
2019	46