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Property, Plant And Equipment
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant And Equipment Property, Plant and Equipment
Property, plant and equipment at December 31 consisted of the following:
20202019
Land$512 $527 
Buildings and land improvements14,415 14,288 
Machinery and equipment16,060 15,723 
Construction in progress1,340 1,306 
Gross property, plant and equipment32,327 31,844 
Less accumulated depreciation(20,507)(19,342)
Total$11,820 $12,502 
Depreciation expense was $1,533, $1,567 and $1,556 for the years ended December 31, 2020, 2019 and 2018, respectively. Interest capitalized during the years ended December 31, 2020, 2019 and 2018 totaled $81, $83 and $81, respectively.
During 2020 and 2019, we acquired $47 and $128 of property, plant and equipment through non-cash investing and financing transactions. Accounts payable related to purchases of property, plant and equipment were $182 and $256 for the years ended December 31, 2020 and 2019.