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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Estimated Useful Lives of PP&E
Depreciation is provided on a straight-line basis over the estimated useful lives of the assets described below (in years). The Company periodically reviews the estimated useful lives of its PP&E and, where appropriate, changes are made prospectively.
Land improvements25
Buildings and building improvements
25 – 40
Machinery and equipment
3– 18
20202019
Buildings and improvements$1,419 $1,402 
Machinery and equipment6,166 5,836 
Land and improvements307 298 
Construction in progress514 276 
8,406 7,812 
Less: accumulated depreciation and amortization(4,208)(3,925)
$4,198 $3,887 
Schedule of Gross Carrying Amounts and Accumulated Amortization of Finite-Lived Intangible Assets
Customer relationships
11 - 18
Trade names
8 - 27
Technology
6 - 8
Long-term supply contracts15
Patents8
Gross carrying amounts and accumulated amortization of finite-lived intangible assets by major class were as follows:

 December 31, 2020December 31, 2019
 GrossAccumulated amortizationNetGrossAccumulated amortizationNet
Customer relationships$1,661 $(470)$1,191 $1,621 $(331)$1,290 
Trade names565 (65)500 541 (40)501 
Technology165 (67)98 158 (41)117 
Long term supply contracts142 (55)87 150 (48)102 
Patents16 (12)14 (9)
$2,549 $(669)$1,880 $2,484 $(469)$2,015