Intangible Assets

3 Months Ended

Mar. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible assets consisted of:


	As of March 31, 2021						As of December 31, 2020
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Amortized Intangible Assets
License agreements	$	275	$	159	$	116	$	280	$	151	$	129
Customer relationships	261		198		63		268		196		72
Other	52		33		19		54		33		21
Total	$	588	$	390	$	198	$	602	$	380	$	222

Unamortized Intangible Assets
Goodwill	$	1,121					$	1,137
Trademarks	$	552					$	552

For the three months ended March 31, 2021 and 2020, amortization expense related to amortizable intangible assets was approximately $18 million and $13 million, respectively. Based on the Company’s amortizable intangible assets at March 31, 2021, the Company expects amortization expense of approximately $40 million for the remainder of 2021, $34 million for 2022, $25 million for 2023, $22 million for 2024, $17 million for 2025 and $15 million for 2026, excluding effects of currency exchange rates.