Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets

The components of intangible assets were as follows:

	December 31, 2015							December 31, 2014
	Gross					Net		Gross								Net
	Carrying		Accumulated			Intangible		Carrying		Accumulated						Intangible
(Dollars in millions)	Amount		Amortization			Assets		Amount		Amortization			Impairment			Assets
Acquired technology	$	386	$	(291	)	$	95	$	420	$	(287	)	—			$	133
Licenses	234		(176		)	58		242		(169		)	—			73
Patents	233		(123		)	110		232		(117		)	—			115
Customer relationships and contracts	198		(139		)	59		205		(122		)	(5		)	78
Other	88		(54		)	34		85		(38		)	(6		)	41
	$	1,139	$	(783	)	$	356	$	1,184	$	(733	)	$	(11	)	$	440

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

Future estimated amortization expense for the carrying amount of intangible assets as of December 31, 2015 is expected to be as follows (dollars in millions): 

Period	Amount
2016	$	64
2017	57
2018	46
2019	38
2020	31