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Intangible Assets
9 Months Ended
Sep. 30, 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:
    
 September 30, 2021December 31, 2020
 GrossAccumulated amortizationNetGrossAccumulated amortizationNet
Customer relationships$1,382 $(419)$963 $1,413 $(346)$1,067 
Trade names550 (81)469 565 (65)500 
Technology161 (83)78 165 (67)98 
Long term supply contracts139 (61)78 142 (55)87 
Patents13 (10)13 (10)
$2,245 $(654)$1,591 $2,298 $(543)$1,755 

Net income from continuing operations for the three and nine months ended September 30, 2021 and 2020 included amortization expense of $42, $125, $41 and $121, respectively.