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PROPERTY, PLANT AND EQUIPMENT-NET
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
 December 31,
20202019
Land and improvements$259 $251 
Machinery and equipment10,008 9,586 
Buildings and improvements3,245 3,152 
Construction in progress825 724 
14,337 13,713 
Less—Accumulated depreciation(8,767)(8,388)
$5,570 $5,325 
Depreciation expense was $644 million, $673 million and $721 million for the years ended December 31, 2020, 2019 and 2018.