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Property, Plant and Equipment
 3 Months Ended
Mar. 31, 2022
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
Property, plant and equipment by major asset class consists of the following:
(Dollars in millions)March 31, 2022December 31, 2021
Land, buildings and improvements$317 $312 
Plant and machinery192 191 
Equipment and other301 298 
Total property, plant and equipment, at cost810 801 
Less accumulated depreciation(443)(437)
Total property, plant and equipment, net$367 $364 
Depreciation expense related to property, plant and equipment was $13 million and $12 million for the periods ended March 31, 2022 and March 31, 2021, respectively.