Intangible Assets Intangible Assets

12 Months Ended

Dec. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

Intangible Assets

Gross carrying amounts and accumulated amortization of finite-lived intangible assets by major class were as follows:

	December 31, 2021						December 31, 2020
	Gross		Accumulated amortization		Net		Gross		Accumulated amortization		Net
Customer relationships	$	1,363	$	(443)	$	920	$	1,413	$	(346)	$	1,067
Trade names	544		(86)		458		565		(65)		500
Technology	158		(88)		70		165		(67)		98
Long term supply contracts	137		(63)		74		142		(55)		87
Patents	15		(12)		3		13		(10)		3
	$	2,217	$	(692)	$	1,525	$	2,298	$	(543)	$	1,755

Amortization expense for the years ended December 31, 2021, 2020, and 2019 was $165, $162 and $169.

During the year-ended December 31, 2021, $13 of intangible assets related to the expected sale of a Transit Packaging business were reclassified to current assets held for sale. See Note B for more information.

Annual amortization expense is estimated to be $165 for 2022 and 2023, $154 for 2024, $147 for 2025, and $138 for 2026.