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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 are comprised of the following at December 31:
Useful Life20202019
Land and improvements (1)
8 - 20 years (1)
$404 $430 
Buildings, structures and related equipment
5 - 40 years
2,618 2,870 
Machinery, equipment and other
2 - 20 years
7,451 7,324 
Total cost10,473 10,624 
Less: Accumulated depreciation (5,115)(4,384)
Property, plant and equipment, less accumulated depreciation
 $5,358 $6,240 
(1)Useful life excludes land.
Depreciation expense relating to property, plant and equipment was $1,009 million, $1,053 million and $1,031 million for the years ended December 31, 2020, 2019 and 2018, respectively. See "Note 20. Restructuring, Impairment and Other" for additional information on property, plant and equipment impairments.