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Intangible Assets
 12 Months Ended
Dec. 31, 2024
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, 2024December 31, 2023
 GrossAccumulated amortizationNetGrossAccumulated amortizationNet
Customer relationships$1,342 $(734)$608 $1,423 $(670)$753 
Trade names522 (148)374 539 (130)409 
Technology153 (140)13 159 (133)26 
Long term supply contracts139 (92)47 167 (99)68 
Patents12 (10)2 12 (10)2 
$2,168 $(1,124)$1,044 $2,300 $(1,042)$1,258 

$14 of customer relationship intangible assets were acquired from the 2023 acquisition of Helvetia Packaging AG. See Note B for more information.

Amortization expense for the years ended December 31, 2024, 2023, and 2022 was $151, $163 and $159.

Annual amortization expense is estimated to be $147 for 2025, $138 for 2026, $135 for 2027, $134 for 2028 and $122 for 2029.