Intangible Assets

6 Months Ended

Jun. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible assets consisted of:



	As of June 30, 2019						As of December 31, 2018
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Amortized Intangible Assets
License agreements	$	308	$	183	$	125	$	305	$	168	$	137
Customer relationships	258		154		104		251		141		110
Other	52		24		28		52		21		31
Total	$	618	$	361	$	257	$	608	$	330	$	278

Unamortized Intangible Assets
Goodwill	$	1,107					$	1,092
Trademarks	$	549					$	547

For the three months ended June 30, 2019 and 2018, amortization expense related to amortizable intangible assets was approximately $14 million and $19 million, respectively. For the six months ended June 30, 2019 and 2018, amortization expense related to amortizable intangible assets was approximately $31 million and $33 million, respectively. Based on the Company’s amortizable intangible assets at June 30, 2019, the Company expects amortization expense of approximately $27 million for the remainder of 2019, $51 million for 2020, $38 million for 2021, $27 million for 2022, $23 million for 2023 and $20 million for 2024, excluding effects of currency exchange rates.