Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets and Goodwill [Table Text Block]

A roll-forward of the carrying amounts of intangible assets is presented below:

	Definite-lived intangibles								Indefinite-lived intangibles
	Developed Technology			Customer Related			Other		Goodwill		Total
	(Dollars in Millions)
December 31, 2015	$	19		$	67		$	7	$	40	$	133
Amortization	(1		)	(3		)	—		—		(4		)
March 31, 2016	$	18		$	64		$	7	$	40	$	129

Intangible assets, net at March 31, 2016 and December 31, 2015, are comprised of the following:

		March 31, 2016						December 31, 2015
	Estimated Weighted Average Useful Life (years)	Gross Carrying Value		Accumulated Amortization		Net Carrying Value		Gross Carrying Value		Accumulated Amortization		Net Carrying Value
		(Dollars in Millions)
Definite-Lived:
Developed technology	7	$	39	$	21	$	18	$	39	$	20	$	19
Customer related	10	84		20		64		84		17		67
Other	32	8		1		7		8		1		7
Subtotal		131		42		89		131		38		93
Indefinite-Lived:
Goodwill		40		—		40		40		—		40
Total		$	171	$	42	$	129	$	171	$	38	$	133