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Intangible Assets

12 Months Ended

Dec. 31, 2022

Goodwill and Intangible Assets Disclosure [Abstract]

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


	December 31, 2022						December 31, 2021
	Gross		Accumulated amortization		Net		Gross		Accumulated amortization		Net
Customer relationships	$	1,356	$	(542)	$	814	$	1,363	$	(443)	$	920
Trade names	530		(106)		424		544		(86)		458
Technology	157		(109)		48		158		(88)		70
Long term supply contracts	146		(76)		70		137		(63)		74
Patents	11		(9)		2		15		(12)		3
	$	2,200	$	(842)	$	1,358	$	2,217	$	(692)	$	1,525

Amortization expense for the years ended December 31, 2022, 2021, and 2020 was $159, $165 and $162.

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

Annual amortization expense is estimated to be $157 for 2023, $146 for 2024, $141 for 2025, $132 for 2026 and $129 for 2027.