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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
The cost and accumulated depreciation of property, plant and equipment at December 31, 2021 and 2020 were as follows:
 December 31,
 20212020
Land and land improvements$90 $102 
Buildings253 261 
Plant and equipment2,070 2,149 
Construction in progress109 117 
Total2,522 2,629 
Less accumulated depreciation(1,674)(1,682)
Property, plant, and equipment—net$848 $947 
 
Depreciation expense for the years ended December 31, 2021, 2020 and 2019 was $113 million, $110 million and $106 million, respectively.