Intangible Assets, net

Intangible assets, net as of June 30, 2018 and December 31, 2017, are comprised of the following:



		June 30, 2018							December 31, 2017
	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	8	$	40	$	(29	)	$	11	$	40	$	(27	)	$	13
Customer related	10	87		(39		)	48		88		(35		)	53
Capitalized software development	4	11		(2		)	9		8		(1		)	7
Other	23	13		(1		)	12		13		(1		)	12
Subtotal		151		(71		)	80		149		(64		)	85
Indefinite-Lived:
Goodwill		45		—			45		47		—			47
Total		$	196	$	(71	)	$	125	$	196	$	(64	)	$	132

The Company recorded approximately $3 million and $7 million of amortization expense related to definite-lived intangible assets for the three and six months ended June 30, 2018, respectively. The Company currently estimates annual amortization expense to be $16 million for both 2018 and 2019, $13 million for 2020, and $11 million for years 2021 and 2022. Indefinite-lived intangible assets are not amortized but are tested for impairment at least annually, or earlier when events and circumstances indicate that it is more likely than not that such assets have been impaired. There were no indicators of impairment during the six months ended June 30, 2018.

During the year ended December 31, 2017, the Company contributed $2 million to American Center for Mobility, a non-profit state of the art research and development facility. The contribution provides the Company certain rights regarding access to the facility for three years. The Company will use the facility for autonomous driving research and development activities for multiple products and therefore capitalized the contribution as an intangible asset. The Company will make a second contribution of $2 million during the third quarter of 2018. The asset is being amortized on a straight-line basis over a 36 month period beginning in January 2018.

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



	Definite-lived intangibles
	Developed Technology			Customer Related			Capitalized Software Development			Other		Goodwill			Total
	(Dollars in Millions)
December 31, 2017	$	13		$	53		$	7		$	12	$	47		$	132
Additions	—			—			3			—		—			3
Foreign currency	—			(1		)	—			—		(2		)	(3		)
Amortization	(2		)	(4		)	(1		)	—		—			(7		)
June 30, 2018	$	11		$	48		$	9		$	12	$	45		$	125